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
1188         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1189             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1190                 ps = &sdata->bss->ps;
1191         else
1192                 return;
1193
1194         atomic_inc(&ps->num_sta_ps);
1195         set_sta_flag(sta, WLAN_STA_PS_STA);
1196         if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1197                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1198         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1199                sta->sta.addr, sta->sta.aid);
1200 }
1201
1202 static void sta_ps_end(struct sta_info *sta)
1203 {
1204         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1205                sta->sta.addr, sta->sta.aid);
1206
1207         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1208                 /*
1209                  * Clear the flag only if the other one is still set
1210                  * so that the TX path won't start TX'ing new frames
1211                  * directly ... In the case that the driver flag isn't
1212                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1213                  */
1214                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1215                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1216                        sta->sta.addr, sta->sta.aid);
1217                 return;
1218         }
1219
1220         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1221         clear_sta_flag(sta, WLAN_STA_PS_STA);
1222         ieee80211_sta_ps_deliver_wakeup(sta);
1223 }
1224
1225 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1226 {
1227         struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1228         bool in_ps;
1229
1230         WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1231
1232         /* Don't let the same PS state be set twice */
1233         in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1234         if ((start && in_ps) || (!start && !in_ps))
1235                 return -EINVAL;
1236
1237         if (start)
1238                 sta_ps_start(sta_inf);
1239         else
1240                 sta_ps_end(sta_inf);
1241
1242         return 0;
1243 }
1244 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1245
1246 static ieee80211_rx_result debug_noinline
1247 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1248 {
1249         struct ieee80211_sub_if_data *sdata = rx->sdata;
1250         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1251         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1252         int tid, ac;
1253
1254         if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1255                 return RX_CONTINUE;
1256
1257         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1258             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1259                 return RX_CONTINUE;
1260
1261         /*
1262          * The device handles station powersave, so don't do anything about
1263          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1264          * it to mac80211 since they're handled.)
1265          */
1266         if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1267                 return RX_CONTINUE;
1268
1269         /*
1270          * Don't do anything if the station isn't already asleep. In
1271          * the uAPSD case, the station will probably be marked asleep,
1272          * in the PS-Poll case the station must be confused ...
1273          */
1274         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1275                 return RX_CONTINUE;
1276
1277         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1278                 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1279                         if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1280                                 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1281                         else
1282                                 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1283                 }
1284
1285                 /* Free PS Poll skb here instead of returning RX_DROP that would
1286                  * count as an dropped frame. */
1287                 dev_kfree_skb(rx->skb);
1288
1289                 return RX_QUEUED;
1290         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1291                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1292                    ieee80211_has_pm(hdr->frame_control) &&
1293                    (ieee80211_is_data_qos(hdr->frame_control) ||
1294                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1295                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1296                 ac = ieee802_1d_to_ac[tid & 7];
1297
1298                 /*
1299                  * If this AC is not trigger-enabled do nothing.
1300                  *
1301                  * NB: This could/should check a separate bitmap of trigger-
1302                  * enabled queues, but for now we only implement uAPSD w/o
1303                  * TSPEC changes to the ACs, so they're always the same.
1304                  */
1305                 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1306                         return RX_CONTINUE;
1307
1308                 /* if we are in a service period, do nothing */
1309                 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1310                         return RX_CONTINUE;
1311
1312                 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1313                         ieee80211_sta_ps_deliver_uapsd(rx->sta);
1314                 else
1315                         set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1316         }
1317
1318         return RX_CONTINUE;
1319 }
1320
1321 static ieee80211_rx_result debug_noinline
1322 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1323 {
1324         struct sta_info *sta = rx->sta;
1325         struct sk_buff *skb = rx->skb;
1326         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1327         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1328         int i;
1329
1330         if (!sta)
1331                 return RX_CONTINUE;
1332
1333         /*
1334          * Update last_rx only for IBSS packets which are for the current
1335          * BSSID and for station already AUTHORIZED to avoid keeping the
1336          * current IBSS network alive in cases where other STAs start
1337          * using different BSSID. This will also give the station another
1338          * chance to restart the authentication/authorization in case
1339          * something went wrong the first time.
1340          */
1341         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1342                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1343                                                 NL80211_IFTYPE_ADHOC);
1344                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1345                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1346                         sta->last_rx = jiffies;
1347                         if (ieee80211_is_data(hdr->frame_control) &&
1348                             !is_multicast_ether_addr(hdr->addr1)) {
1349                                 sta->last_rx_rate_idx = status->rate_idx;
1350                                 sta->last_rx_rate_flag = status->flag;
1351                                 sta->last_rx_rate_vht_flag = status->vht_flag;
1352                                 sta->last_rx_rate_vht_nss = status->vht_nss;
1353                         }
1354                 }
1355         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1356                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1357                                                 NL80211_IFTYPE_OCB);
1358                 /* OCB uses wild-card BSSID */
1359                 if (is_broadcast_ether_addr(bssid))
1360                         sta->last_rx = jiffies;
1361         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1362                 /*
1363                  * Mesh beacons will update last_rx when if they are found to
1364                  * match the current local configuration when processed.
1365                  */
1366                 sta->last_rx = jiffies;
1367                 if (ieee80211_is_data(hdr->frame_control)) {
1368                         sta->last_rx_rate_idx = status->rate_idx;
1369                         sta->last_rx_rate_flag = status->flag;
1370                         sta->last_rx_rate_vht_flag = status->vht_flag;
1371                         sta->last_rx_rate_vht_nss = status->vht_nss;
1372                 }
1373         }
1374
1375         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1376                 return RX_CONTINUE;
1377
1378         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1379                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1380
1381         sta->rx_fragments++;
1382         sta->rx_bytes += rx->skb->len;
1383         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1384                 sta->last_signal = status->signal;
1385                 ewma_add(&sta->avg_signal, -status->signal);
1386         }
1387
1388         if (status->chains) {
1389                 sta->chains = status->chains;
1390                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1391                         int signal = status->chain_signal[i];
1392
1393                         if (!(status->chains & BIT(i)))
1394                                 continue;
1395
1396                         sta->chain_signal_last[i] = signal;
1397                         ewma_add(&sta->chain_signal_avg[i], -signal);
1398                 }
1399         }
1400
1401         /*
1402          * Change STA power saving mode only at the end of a frame
1403          * exchange sequence.
1404          */
1405         if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1406             !ieee80211_has_morefrags(hdr->frame_control) &&
1407             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1408             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1409              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1410             /* PM bit is only checked in frames where it isn't reserved,
1411              * in AP mode it's reserved in non-bufferable management frames
1412              * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1413              */
1414             (!ieee80211_is_mgmt(hdr->frame_control) ||
1415              ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1416                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1417                         if (!ieee80211_has_pm(hdr->frame_control))
1418                                 sta_ps_end(sta);
1419                 } else {
1420                         if (ieee80211_has_pm(hdr->frame_control))
1421                                 sta_ps_start(sta);
1422                 }
1423         }
1424
1425         /* mesh power save support */
1426         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1427                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1428
1429         /*
1430          * Drop (qos-)data::nullfunc frames silently, since they
1431          * are used only to control station power saving mode.
1432          */
1433         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1434             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1435                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1436
1437                 /*
1438                  * If we receive a 4-addr nullfunc frame from a STA
1439                  * that was not moved to a 4-addr STA vlan yet send
1440                  * the event to userspace and for older hostapd drop
1441                  * the frame to the monitor interface.
1442                  */
1443                 if (ieee80211_has_a4(hdr->frame_control) &&
1444                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1445                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1446                       !rx->sdata->u.vlan.sta))) {
1447                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1448                                 cfg80211_rx_unexpected_4addr_frame(
1449                                         rx->sdata->dev, sta->sta.addr,
1450                                         GFP_ATOMIC);
1451                         return RX_DROP_MONITOR;
1452                 }
1453                 /*
1454                  * Update counter and free packet here to avoid
1455                  * counting this as a dropped packed.
1456                  */
1457                 sta->rx_packets++;
1458                 dev_kfree_skb(rx->skb);
1459                 return RX_QUEUED;
1460         }
1461
1462         return RX_CONTINUE;
1463 } /* ieee80211_rx_h_sta_process */
1464
1465 static ieee80211_rx_result debug_noinline
1466 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1467 {
1468         struct sk_buff *skb = rx->skb;
1469         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1470         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1471         int keyidx;
1472         int hdrlen;
1473         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1474         struct ieee80211_key *sta_ptk = NULL;
1475         int mmie_keyidx = -1;
1476         __le16 fc;
1477         const struct ieee80211_cipher_scheme *cs = NULL;
1478
1479         /*
1480          * Key selection 101
1481          *
1482          * There are four types of keys:
1483          *  - GTK (group keys)
1484          *  - IGTK (group keys for management frames)
1485          *  - PTK (pairwise keys)
1486          *  - STK (station-to-station pairwise keys)
1487          *
1488          * When selecting a key, we have to distinguish between multicast
1489          * (including broadcast) and unicast frames, the latter can only
1490          * use PTKs and STKs while the former always use GTKs and IGTKs.
1491          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1492          * unicast frames can also use key indices like GTKs. Hence, if we
1493          * don't have a PTK/STK we check the key index for a WEP key.
1494          *
1495          * Note that in a regular BSS, multicast frames are sent by the
1496          * AP only, associated stations unicast the frame to the AP first
1497          * which then multicasts it on their behalf.
1498          *
1499          * There is also a slight problem in IBSS mode: GTKs are negotiated
1500          * with each station, that is something we don't currently handle.
1501          * The spec seems to expect that one negotiates the same key with
1502          * every station but there's no such requirement; VLANs could be
1503          * possible.
1504          */
1505
1506         /*
1507          * No point in finding a key and decrypting if the frame is neither
1508          * addressed to us nor a multicast frame.
1509          */
1510         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1511                 return RX_CONTINUE;
1512
1513         /* start without a key */
1514         rx->key = NULL;
1515         fc = hdr->frame_control;
1516
1517         if (rx->sta) {
1518                 int keyid = rx->sta->ptk_idx;
1519
1520                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1521                         cs = rx->sta->cipher_scheme;
1522                         keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1523                         if (unlikely(keyid < 0))
1524                                 return RX_DROP_UNUSABLE;
1525                 }
1526                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1527         }
1528
1529         if (!ieee80211_has_protected(fc))
1530                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1531
1532         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1533                 rx->key = sta_ptk;
1534                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1535                     (status->flag & RX_FLAG_IV_STRIPPED))
1536                         return RX_CONTINUE;
1537                 /* Skip decryption if the frame is not protected. */
1538                 if (!ieee80211_has_protected(fc))
1539                         return RX_CONTINUE;
1540         } else if (mmie_keyidx >= 0) {
1541                 /* Broadcast/multicast robust management frame / BIP */
1542                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1543                     (status->flag & RX_FLAG_IV_STRIPPED))
1544                         return RX_CONTINUE;
1545
1546                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1547                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1548                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1549                 if (rx->sta)
1550                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1551                 if (!rx->key)
1552                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1553         } else if (!ieee80211_has_protected(fc)) {
1554                 /*
1555                  * The frame was not protected, so skip decryption. However, we
1556                  * need to set rx->key if there is a key that could have been
1557                  * used so that the frame may be dropped if encryption would
1558                  * have been expected.
1559                  */
1560                 struct ieee80211_key *key = NULL;
1561                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1562                 int i;
1563
1564                 if (ieee80211_is_mgmt(fc) &&
1565                     is_multicast_ether_addr(hdr->addr1) &&
1566                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1567                         rx->key = key;
1568                 else {
1569                         if (rx->sta) {
1570                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1571                                         key = rcu_dereference(rx->sta->gtk[i]);
1572                                         if (key)
1573                                                 break;
1574                                 }
1575                         }
1576                         if (!key) {
1577                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1578                                         key = rcu_dereference(sdata->keys[i]);
1579                                         if (key)
1580                                                 break;
1581                                 }
1582                         }
1583                         if (key)
1584                                 rx->key = key;
1585                 }
1586                 return RX_CONTINUE;
1587         } else {
1588                 u8 keyid;
1589
1590                 /*
1591                  * The device doesn't give us the IV so we won't be
1592                  * able to look up the key. That's ok though, we
1593                  * don't need to decrypt the frame, we just won't
1594                  * be able to keep statistics accurate.
1595                  * Except for key threshold notifications, should
1596                  * we somehow allow the driver to tell us which key
1597                  * the hardware used if this flag is set?
1598                  */
1599                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1600                     (status->flag & RX_FLAG_IV_STRIPPED))
1601                         return RX_CONTINUE;
1602
1603                 hdrlen = ieee80211_hdrlen(fc);
1604
1605                 if (cs) {
1606                         keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
1607
1608                         if (unlikely(keyidx < 0))
1609                                 return RX_DROP_UNUSABLE;
1610                 } else {
1611                         if (rx->skb->len < 8 + hdrlen)
1612                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1613                         /*
1614                          * no need to call ieee80211_wep_get_keyidx,
1615                          * it verifies a bunch of things we've done already
1616                          */
1617                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1618                         keyidx = keyid >> 6;
1619                 }
1620
1621                 /* check per-station GTK first, if multicast packet */
1622                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1623                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1624
1625                 /* if not found, try default key */
1626                 if (!rx->key) {
1627                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1628
1629                         /*
1630                          * RSNA-protected unicast frames should always be
1631                          * sent with pairwise or station-to-station keys,
1632                          * but for WEP we allow using a key index as well.
1633                          */
1634                         if (rx->key &&
1635                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1636                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1637                             !is_multicast_ether_addr(hdr->addr1))
1638                                 rx->key = NULL;
1639                 }
1640         }
1641
1642         if (rx->key) {
1643                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1644                         return RX_DROP_MONITOR;
1645
1646                 rx->key->tx_rx_count++;
1647                 /* TODO: add threshold stuff again */
1648         } else {
1649                 return RX_DROP_MONITOR;
1650         }
1651
1652         switch (rx->key->conf.cipher) {
1653         case WLAN_CIPHER_SUITE_WEP40:
1654         case WLAN_CIPHER_SUITE_WEP104:
1655                 result = ieee80211_crypto_wep_decrypt(rx);
1656                 break;
1657         case WLAN_CIPHER_SUITE_TKIP:
1658                 result = ieee80211_crypto_tkip_decrypt(rx);
1659                 break;
1660         case WLAN_CIPHER_SUITE_CCMP:
1661                 result = ieee80211_crypto_ccmp_decrypt(
1662                         rx, IEEE80211_CCMP_MIC_LEN);
1663                 break;
1664         case WLAN_CIPHER_SUITE_CCMP_256:
1665                 result = ieee80211_crypto_ccmp_decrypt(
1666                         rx, IEEE80211_CCMP_256_MIC_LEN);
1667                 break;
1668         case WLAN_CIPHER_SUITE_AES_CMAC:
1669                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1670                 break;
1671         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1672                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1673                 break;
1674         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1675         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1676                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1677                 break;
1678         case WLAN_CIPHER_SUITE_GCMP:
1679         case WLAN_CIPHER_SUITE_GCMP_256:
1680                 result = ieee80211_crypto_gcmp_decrypt(rx);
1681                 break;
1682         default:
1683                 result = ieee80211_crypto_hw_decrypt(rx);
1684         }
1685
1686         /* the hdr variable is invalid after the decrypt handlers */
1687
1688         /* either the frame has been decrypted or will be dropped */
1689         status->flag |= RX_FLAG_DECRYPTED;
1690
1691         return result;
1692 }
1693
1694 static inline struct ieee80211_fragment_entry *
1695 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1696                          unsigned int frag, unsigned int seq, int rx_queue,
1697                          struct sk_buff **skb)
1698 {
1699         struct ieee80211_fragment_entry *entry;
1700
1701         entry = &sdata->fragments[sdata->fragment_next++];
1702         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1703                 sdata->fragment_next = 0;
1704
1705         if (!skb_queue_empty(&entry->skb_list))
1706                 __skb_queue_purge(&entry->skb_list);
1707
1708         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1709         *skb = NULL;
1710         entry->first_frag_time = jiffies;
1711         entry->seq = seq;
1712         entry->rx_queue = rx_queue;
1713         entry->last_frag = frag;
1714         entry->ccmp = 0;
1715         entry->extra_len = 0;
1716
1717         return entry;
1718 }
1719
1720 static inline struct ieee80211_fragment_entry *
1721 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1722                           unsigned int frag, unsigned int seq,
1723                           int rx_queue, struct ieee80211_hdr *hdr)
1724 {
1725         struct ieee80211_fragment_entry *entry;
1726         int i, idx;
1727
1728         idx = sdata->fragment_next;
1729         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1730                 struct ieee80211_hdr *f_hdr;
1731
1732                 idx--;
1733                 if (idx < 0)
1734                         idx = IEEE80211_FRAGMENT_MAX - 1;
1735
1736                 entry = &sdata->fragments[idx];
1737                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1738                     entry->rx_queue != rx_queue ||
1739                     entry->last_frag + 1 != frag)
1740                         continue;
1741
1742                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1743
1744                 /*
1745                  * Check ftype and addresses are equal, else check next fragment
1746                  */
1747                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1748                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1749                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1750                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1751                         continue;
1752
1753                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1754                         __skb_queue_purge(&entry->skb_list);
1755                         continue;
1756                 }
1757                 return entry;
1758         }
1759
1760         return NULL;
1761 }
1762
1763 static ieee80211_rx_result debug_noinline
1764 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1765 {
1766         struct ieee80211_hdr *hdr;
1767         u16 sc;
1768         __le16 fc;
1769         unsigned int frag, seq;
1770         struct ieee80211_fragment_entry *entry;
1771         struct sk_buff *skb;
1772         struct ieee80211_rx_status *status;
1773
1774         hdr = (struct ieee80211_hdr *)rx->skb->data;
1775         fc = hdr->frame_control;
1776
1777         if (ieee80211_is_ctl(fc))
1778                 return RX_CONTINUE;
1779
1780         sc = le16_to_cpu(hdr->seq_ctrl);
1781         frag = sc & IEEE80211_SCTL_FRAG;
1782
1783         if (is_multicast_ether_addr(hdr->addr1)) {
1784                 rx->local->dot11MulticastReceivedFrameCount++;
1785                 goto out_no_led;
1786         }
1787
1788         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1789                 goto out;
1790
1791         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1792
1793         if (skb_linearize(rx->skb))
1794                 return RX_DROP_UNUSABLE;
1795
1796         /*
1797          *  skb_linearize() might change the skb->data and
1798          *  previously cached variables (in this case, hdr) need to
1799          *  be refreshed with the new data.
1800          */
1801         hdr = (struct ieee80211_hdr *)rx->skb->data;
1802         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1803
1804         if (frag == 0) {
1805                 /* This is the first fragment of a new frame. */
1806                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1807                                                  rx->seqno_idx, &(rx->skb));
1808                 if (rx->key &&
1809                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
1810                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256) &&
1811                     ieee80211_has_protected(fc)) {
1812                         int queue = rx->security_idx;
1813                         /* Store CCMP PN so that we can verify that the next
1814                          * fragment has a sequential PN value. */
1815                         entry->ccmp = 1;
1816                         memcpy(entry->last_pn,
1817                                rx->key->u.ccmp.rx_pn[queue],
1818                                IEEE80211_CCMP_PN_LEN);
1819                 }
1820                 return RX_QUEUED;
1821         }
1822
1823         /* This is a fragment for a frame that should already be pending in
1824          * fragment cache. Add this fragment to the end of the pending entry.
1825          */
1826         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1827                                           rx->seqno_idx, hdr);
1828         if (!entry) {
1829                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1830                 return RX_DROP_MONITOR;
1831         }
1832
1833         /* Verify that MPDUs within one MSDU have sequential PN values.
1834          * (IEEE 802.11i, 8.3.3.4.5) */
1835         if (entry->ccmp) {
1836                 int i;
1837                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1838                 int queue;
1839                 if (!rx->key ||
1840                     (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
1841                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256))
1842                         return RX_DROP_UNUSABLE;
1843                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1844                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1845                         pn[i]++;
1846                         if (pn[i])
1847                                 break;
1848                 }
1849                 queue = rx->security_idx;
1850                 rpn = rx->key->u.ccmp.rx_pn[queue];
1851                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1852                         return RX_DROP_UNUSABLE;
1853                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1854         }
1855
1856         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1857         __skb_queue_tail(&entry->skb_list, rx->skb);
1858         entry->last_frag = frag;
1859         entry->extra_len += rx->skb->len;
1860         if (ieee80211_has_morefrags(fc)) {
1861                 rx->skb = NULL;
1862                 return RX_QUEUED;
1863         }
1864
1865         rx->skb = __skb_dequeue(&entry->skb_list);
1866         if (skb_tailroom(rx->skb) < entry->extra_len) {
1867                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1868                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1869                                               GFP_ATOMIC))) {
1870                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1871                         __skb_queue_purge(&entry->skb_list);
1872                         return RX_DROP_UNUSABLE;
1873                 }
1874         }
1875         while ((skb = __skb_dequeue(&entry->skb_list))) {
1876                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1877                 dev_kfree_skb(skb);
1878         }
1879
1880         /* Complete frame has been reassembled - process it now */
1881         status = IEEE80211_SKB_RXCB(rx->skb);
1882         status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1883
1884  out:
1885         ieee80211_led_rx(rx->local);
1886  out_no_led:
1887         if (rx->sta)
1888                 rx->sta->rx_packets++;
1889         return RX_CONTINUE;
1890 }
1891
1892 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1893 {
1894         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1895                 return -EACCES;
1896
1897         return 0;
1898 }
1899
1900 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1901 {
1902         struct sk_buff *skb = rx->skb;
1903         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1904
1905         /*
1906          * Pass through unencrypted frames if the hardware has
1907          * decrypted them already.
1908          */
1909         if (status->flag & RX_FLAG_DECRYPTED)
1910                 return 0;
1911
1912         /* Drop unencrypted frames if key is set. */
1913         if (unlikely(!ieee80211_has_protected(fc) &&
1914                      !ieee80211_is_nullfunc(fc) &&
1915                      ieee80211_is_data(fc) &&
1916                      (rx->key || rx->sdata->drop_unencrypted)))
1917                 return -EACCES;
1918
1919         return 0;
1920 }
1921
1922 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1923 {
1924         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1925         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1926         __le16 fc = hdr->frame_control;
1927
1928         /*
1929          * Pass through unencrypted frames if the hardware has
1930          * decrypted them already.
1931          */
1932         if (status->flag & RX_FLAG_DECRYPTED)
1933                 return 0;
1934
1935         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1936                 if (unlikely(!ieee80211_has_protected(fc) &&
1937                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1938                              rx->key)) {
1939                         if (ieee80211_is_deauth(fc) ||
1940                             ieee80211_is_disassoc(fc))
1941                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1942                                                              rx->skb->data,
1943                                                              rx->skb->len);
1944                         return -EACCES;
1945                 }
1946                 /* BIP does not use Protected field, so need to check MMIE */
1947                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1948                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1949                         if (ieee80211_is_deauth(fc) ||
1950                             ieee80211_is_disassoc(fc))
1951                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1952                                                              rx->skb->data,
1953                                                              rx->skb->len);
1954                         return -EACCES;
1955                 }
1956                 /*
1957                  * When using MFP, Action frames are not allowed prior to
1958                  * having configured keys.
1959                  */
1960                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1961                              ieee80211_is_robust_mgmt_frame(rx->skb)))
1962                         return -EACCES;
1963         }
1964
1965         return 0;
1966 }
1967
1968 static int
1969 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1970 {
1971         struct ieee80211_sub_if_data *sdata = rx->sdata;
1972         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1973         bool check_port_control = false;
1974         struct ethhdr *ehdr;
1975         int ret;
1976
1977         *port_control = false;
1978         if (ieee80211_has_a4(hdr->frame_control) &&
1979             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1980                 return -1;
1981
1982         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1983             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1984
1985                 if (!sdata->u.mgd.use_4addr)
1986                         return -1;
1987                 else
1988                         check_port_control = true;
1989         }
1990
1991         if (is_multicast_ether_addr(hdr->addr1) &&
1992             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1993                 return -1;
1994
1995         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1996         if (ret < 0)
1997                 return ret;
1998
1999         ehdr = (struct ethhdr *) rx->skb->data;
2000         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2001                 *port_control = true;
2002         else if (check_port_control)
2003                 return -1;
2004
2005         return 0;
2006 }
2007
2008 /*
2009  * requires that rx->skb is a frame with ethernet header
2010  */
2011 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2012 {
2013         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2014                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2015         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2016
2017         /*
2018          * Allow EAPOL frames to us/the PAE group address regardless
2019          * of whether the frame was encrypted or not.
2020          */
2021         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2022             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2023              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2024                 return true;
2025
2026         if (ieee80211_802_1x_port_control(rx) ||
2027             ieee80211_drop_unencrypted(rx, fc))
2028                 return false;
2029
2030         return true;
2031 }
2032
2033 /*
2034  * requires that rx->skb is a frame with ethernet header
2035  */
2036 static void
2037 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2038 {
2039         struct ieee80211_sub_if_data *sdata = rx->sdata;
2040         struct net_device *dev = sdata->dev;
2041         struct sk_buff *skb, *xmit_skb;
2042         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2043         struct sta_info *dsta;
2044         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2045
2046         skb = rx->skb;
2047         xmit_skb = NULL;
2048
2049         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2050              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2051             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2052             (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
2053             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2054                 if (is_multicast_ether_addr(ehdr->h_dest)) {
2055                         /*
2056                          * send multicast frames both to higher layers in
2057                          * local net stack and back to the wireless medium
2058                          */
2059                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2060                         if (!xmit_skb)
2061                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2062                                                     dev->name);
2063                 } else {
2064                         dsta = sta_info_get(sdata, skb->data);
2065                         if (dsta) {
2066                                 /*
2067                                  * The destination station is associated to
2068                                  * this AP (in this VLAN), so send the frame
2069                                  * directly to it and do not pass it to local
2070                                  * net stack.
2071                                  */
2072                                 xmit_skb = skb;
2073                                 skb = NULL;
2074                         }
2075                 }
2076         }
2077
2078 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2079         if (skb) {
2080                 /* 'align' will only take the values 0 or 2 here since all
2081                  * frames are required to be aligned to 2-byte boundaries
2082                  * when being passed to mac80211; the code here works just
2083                  * as well if that isn't true, but mac80211 assumes it can
2084                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2085                  */
2086                 int align;
2087
2088                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2089                 if (align) {
2090                         if (WARN_ON(skb_headroom(skb) < 3)) {
2091                                 dev_kfree_skb(skb);
2092                                 skb = NULL;
2093                         } else {
2094                                 u8 *data = skb->data;
2095                                 size_t len = skb_headlen(skb);
2096                                 skb->data -= align;
2097                                 memmove(skb->data, data, len);
2098                                 skb_set_tail_pointer(skb, len);
2099                         }
2100                 }
2101         }
2102 #endif
2103
2104         if (skb) {
2105                 /* deliver to local stack */
2106                 skb->protocol = eth_type_trans(skb, dev);
2107                 memset(skb->cb, 0, sizeof(skb->cb));
2108                 if (rx->local->napi)
2109                         napi_gro_receive(rx->local->napi, skb);
2110                 else
2111                         netif_receive_skb(skb);
2112         }
2113
2114         if (xmit_skb) {
2115                 /*
2116                  * Send to wireless media and increase priority by 256 to
2117                  * keep the received priority instead of reclassifying
2118                  * the frame (see cfg80211_classify8021d).
2119                  */
2120                 xmit_skb->priority += 256;
2121                 xmit_skb->protocol = htons(ETH_P_802_3);
2122                 skb_reset_network_header(xmit_skb);
2123                 skb_reset_mac_header(xmit_skb);
2124                 dev_queue_xmit(xmit_skb);
2125         }
2126 }
2127
2128 static ieee80211_rx_result debug_noinline
2129 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2130 {
2131         struct net_device *dev = rx->sdata->dev;
2132         struct sk_buff *skb = rx->skb;
2133         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2134         __le16 fc = hdr->frame_control;
2135         struct sk_buff_head frame_list;
2136         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2137
2138         if (unlikely(!ieee80211_is_data(fc)))
2139                 return RX_CONTINUE;
2140
2141         if (unlikely(!ieee80211_is_data_present(fc)))
2142                 return RX_DROP_MONITOR;
2143
2144         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2145                 return RX_CONTINUE;
2146
2147         if (ieee80211_has_a4(hdr->frame_control) &&
2148             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2149             !rx->sdata->u.vlan.sta)
2150                 return RX_DROP_UNUSABLE;
2151
2152         if (is_multicast_ether_addr(hdr->addr1) &&
2153             ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2154               rx->sdata->u.vlan.sta) ||
2155              (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2156               rx->sdata->u.mgd.use_4addr)))
2157                 return RX_DROP_UNUSABLE;
2158
2159         skb->dev = dev;
2160         __skb_queue_head_init(&frame_list);
2161
2162         if (skb_linearize(skb))
2163                 return RX_DROP_UNUSABLE;
2164
2165         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2166                                  rx->sdata->vif.type,
2167                                  rx->local->hw.extra_tx_headroom, true);
2168
2169         while (!skb_queue_empty(&frame_list)) {
2170                 rx->skb = __skb_dequeue(&frame_list);
2171
2172                 if (!ieee80211_frame_allowed(rx, fc)) {
2173                         dev_kfree_skb(rx->skb);
2174                         continue;
2175                 }
2176                 dev->stats.rx_packets++;
2177                 dev->stats.rx_bytes += rx->skb->len;
2178
2179                 ieee80211_deliver_skb(rx);
2180         }
2181
2182         return RX_QUEUED;
2183 }
2184
2185 #ifdef CONFIG_MAC80211_MESH
2186 static ieee80211_rx_result
2187 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2188 {
2189         struct ieee80211_hdr *fwd_hdr, *hdr;
2190         struct ieee80211_tx_info *info;
2191         struct ieee80211s_hdr *mesh_hdr;
2192         struct sk_buff *skb = rx->skb, *fwd_skb;
2193         struct ieee80211_local *local = rx->local;
2194         struct ieee80211_sub_if_data *sdata = rx->sdata;
2195         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2196         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2197         u16 q, hdrlen;
2198
2199         hdr = (struct ieee80211_hdr *) skb->data;
2200         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2201
2202         /* make sure fixed part of mesh header is there, also checks skb len */
2203         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2204                 return RX_DROP_MONITOR;
2205
2206         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2207
2208         /* make sure full mesh header is there, also checks skb len */
2209         if (!pskb_may_pull(rx->skb,
2210                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2211                 return RX_DROP_MONITOR;
2212
2213         /* reload pointers */
2214         hdr = (struct ieee80211_hdr *) skb->data;
2215         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2216
2217         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2218                 return RX_DROP_MONITOR;
2219
2220         /* frame is in RMC, don't forward */
2221         if (ieee80211_is_data(hdr->frame_control) &&
2222             is_multicast_ether_addr(hdr->addr1) &&
2223             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2224                 return RX_DROP_MONITOR;
2225
2226         if (!ieee80211_is_data(hdr->frame_control) ||
2227             !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2228                 return RX_CONTINUE;
2229
2230         if (!mesh_hdr->ttl)
2231                 return RX_DROP_MONITOR;
2232
2233         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2234                 struct mesh_path *mppath;
2235                 char *proxied_addr;
2236                 char *mpp_addr;
2237
2238                 if (is_multicast_ether_addr(hdr->addr1)) {
2239                         mpp_addr = hdr->addr3;
2240                         proxied_addr = mesh_hdr->eaddr1;
2241                 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2242                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2243                         mpp_addr = hdr->addr4;
2244                         proxied_addr = mesh_hdr->eaddr2;
2245                 } else {
2246                         return RX_DROP_MONITOR;
2247                 }
2248
2249                 rcu_read_lock();
2250                 mppath = mpp_path_lookup(sdata, proxied_addr);
2251                 if (!mppath) {
2252                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2253                 } else {
2254                         spin_lock_bh(&mppath->state_lock);
2255                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2256                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2257                         spin_unlock_bh(&mppath->state_lock);
2258                 }
2259                 rcu_read_unlock();
2260         }
2261
2262         /* Frame has reached destination.  Don't forward */
2263         if (!is_multicast_ether_addr(hdr->addr1) &&
2264             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2265                 return RX_CONTINUE;
2266
2267         q = ieee80211_select_queue_80211(sdata, skb, hdr);
2268         if (ieee80211_queue_stopped(&local->hw, q)) {
2269                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2270                 return RX_DROP_MONITOR;
2271         }
2272         skb_set_queue_mapping(skb, q);
2273
2274         if (!--mesh_hdr->ttl) {
2275                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2276                 goto out;
2277         }
2278
2279         if (!ifmsh->mshcfg.dot11MeshForwarding)
2280                 goto out;
2281
2282         fwd_skb = skb_copy(skb, GFP_ATOMIC);
2283         if (!fwd_skb) {
2284                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2285                                     sdata->name);
2286                 goto out;
2287         }
2288
2289         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2290         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2291         info = IEEE80211_SKB_CB(fwd_skb);
2292         memset(info, 0, sizeof(*info));
2293         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2294         info->control.vif = &rx->sdata->vif;
2295         info->control.jiffies = jiffies;
2296         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2297                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2298                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2299                 /* update power mode indication when forwarding */
2300                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2301         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2302                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2303                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2304         } else {
2305                 /* unable to resolve next hop */
2306                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2307                                    fwd_hdr->addr3, 0,
2308                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2309                                    fwd_hdr->addr2);
2310                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2311                 kfree_skb(fwd_skb);
2312                 return RX_DROP_MONITOR;
2313         }
2314
2315         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2316         ieee80211_add_pending_skb(local, fwd_skb);
2317  out:
2318         if (is_multicast_ether_addr(hdr->addr1) ||
2319             sdata->dev->flags & IFF_PROMISC)
2320                 return RX_CONTINUE;
2321         else
2322                 return RX_DROP_MONITOR;
2323 }
2324 #endif
2325
2326 static ieee80211_rx_result debug_noinline
2327 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2328 {
2329         struct ieee80211_sub_if_data *sdata = rx->sdata;
2330         struct ieee80211_local *local = rx->local;
2331         struct net_device *dev = sdata->dev;
2332         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2333         __le16 fc = hdr->frame_control;
2334         bool port_control;
2335         int err;
2336
2337         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2338                 return RX_CONTINUE;
2339
2340         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2341                 return RX_DROP_MONITOR;
2342
2343         if (rx->sta) {
2344                 /* The seqno index has the same property as needed
2345                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2346                  * for non-QoS-data frames. Here we know it's a data
2347                  * frame, so count MSDUs.
2348                  */
2349                 rx->sta->rx_msdu[rx->seqno_idx]++;
2350         }
2351
2352         /*
2353          * Send unexpected-4addr-frame event to hostapd. For older versions,
2354          * also drop the frame to cooked monitor interfaces.
2355          */
2356         if (ieee80211_has_a4(hdr->frame_control) &&
2357             sdata->vif.type == NL80211_IFTYPE_AP) {
2358                 if (rx->sta &&
2359                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2360                         cfg80211_rx_unexpected_4addr_frame(
2361                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2362                 return RX_DROP_MONITOR;
2363         }
2364
2365         err = __ieee80211_data_to_8023(rx, &port_control);
2366         if (unlikely(err))
2367                 return RX_DROP_UNUSABLE;
2368
2369         if (!ieee80211_frame_allowed(rx, fc))
2370                 return RX_DROP_MONITOR;
2371
2372         /* directly handle TDLS channel switch requests/responses */
2373         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2374                                                 cpu_to_be16(ETH_P_TDLS))) {
2375                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2376
2377                 if (pskb_may_pull(rx->skb,
2378                                   offsetof(struct ieee80211_tdls_data, u)) &&
2379                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2380                     tf->category == WLAN_CATEGORY_TDLS &&
2381                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2382                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2383                         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TDLS_CHSW;
2384                         skb_queue_tail(&sdata->skb_queue, rx->skb);
2385                         ieee80211_queue_work(&rx->local->hw, &sdata->work);
2386                         if (rx->sta)
2387                                 rx->sta->rx_packets++;
2388
2389                         return RX_QUEUED;
2390                 }
2391         }
2392
2393         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2394             unlikely(port_control) && sdata->bss) {
2395                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2396                                      u.ap);
2397                 dev = sdata->dev;
2398                 rx->sdata = sdata;
2399         }
2400
2401         rx->skb->dev = dev;
2402
2403         dev->stats.rx_packets++;
2404         dev->stats.rx_bytes += rx->skb->len;
2405
2406         if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2407             !is_multicast_ether_addr(
2408                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2409             (!local->scanning &&
2410              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2411                         mod_timer(&local->dynamic_ps_timer, jiffies +
2412                          msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2413         }
2414
2415         ieee80211_deliver_skb(rx);
2416
2417         return RX_QUEUED;
2418 }
2419
2420 static ieee80211_rx_result debug_noinline
2421 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2422 {
2423         struct sk_buff *skb = rx->skb;
2424         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2425         struct tid_ampdu_rx *tid_agg_rx;
2426         u16 start_seq_num;
2427         u16 tid;
2428
2429         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2430                 return RX_CONTINUE;
2431
2432         if (ieee80211_is_back_req(bar->frame_control)) {
2433                 struct {
2434                         __le16 control, start_seq_num;
2435                 } __packed bar_data;
2436
2437                 if (!rx->sta)
2438                         return RX_DROP_MONITOR;
2439
2440                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2441                                   &bar_data, sizeof(bar_data)))
2442                         return RX_DROP_MONITOR;
2443
2444                 tid = le16_to_cpu(bar_data.control) >> 12;
2445
2446                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2447                 if (!tid_agg_rx)
2448                         return RX_DROP_MONITOR;
2449
2450                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2451
2452                 /* reset session timer */
2453                 if (tid_agg_rx->timeout)
2454                         mod_timer(&tid_agg_rx->session_timer,
2455                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2456
2457                 spin_lock(&tid_agg_rx->reorder_lock);
2458                 /* release stored frames up to start of BAR */
2459                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2460                                                  start_seq_num, frames);
2461                 spin_unlock(&tid_agg_rx->reorder_lock);
2462
2463                 kfree_skb(skb);
2464                 return RX_QUEUED;
2465         }
2466
2467         /*
2468          * After this point, we only want management frames,
2469          * so we can drop all remaining control frames to
2470          * cooked monitor interfaces.
2471          */
2472         return RX_DROP_MONITOR;
2473 }
2474
2475 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2476                                            struct ieee80211_mgmt *mgmt,
2477                                            size_t len)
2478 {
2479         struct ieee80211_local *local = sdata->local;
2480         struct sk_buff *skb;
2481         struct ieee80211_mgmt *resp;
2482
2483         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2484                 /* Not to own unicast address */
2485                 return;
2486         }
2487
2488         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2489             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2490                 /* Not from the current AP or not associated yet. */
2491                 return;
2492         }
2493
2494         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2495                 /* Too short SA Query request frame */
2496                 return;
2497         }
2498
2499         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2500         if (skb == NULL)
2501                 return;
2502
2503         skb_reserve(skb, local->hw.extra_tx_headroom);
2504         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2505         memset(resp, 0, 24);
2506         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2507         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2508         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2509         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2510                                           IEEE80211_STYPE_ACTION);
2511         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2512         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2513         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2514         memcpy(resp->u.action.u.sa_query.trans_id,
2515                mgmt->u.action.u.sa_query.trans_id,
2516                WLAN_SA_QUERY_TR_ID_LEN);
2517
2518         ieee80211_tx_skb(sdata, skb);
2519 }
2520
2521 static ieee80211_rx_result debug_noinline
2522 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2523 {
2524         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2525         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2526
2527         /*
2528          * From here on, look only at management frames.
2529          * Data and control frames are already handled,
2530          * and unknown (reserved) frames are useless.
2531          */
2532         if (rx->skb->len < 24)
2533                 return RX_DROP_MONITOR;
2534
2535         if (!ieee80211_is_mgmt(mgmt->frame_control))
2536                 return RX_DROP_MONITOR;
2537
2538         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2539             ieee80211_is_beacon(mgmt->frame_control) &&
2540             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2541                 int sig = 0;
2542
2543                 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2544                         sig = status->signal;
2545
2546                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2547                                             rx->skb->data, rx->skb->len,
2548                                             status->freq, sig);
2549                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2550         }
2551
2552         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2553                 return RX_DROP_MONITOR;
2554
2555         if (ieee80211_drop_unencrypted_mgmt(rx))
2556                 return RX_DROP_UNUSABLE;
2557
2558         return RX_CONTINUE;
2559 }
2560
2561 static ieee80211_rx_result debug_noinline
2562 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2563 {
2564         struct ieee80211_local *local = rx->local;
2565         struct ieee80211_sub_if_data *sdata = rx->sdata;
2566         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2567         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2568         int len = rx->skb->len;
2569
2570         if (!ieee80211_is_action(mgmt->frame_control))
2571                 return RX_CONTINUE;
2572
2573         /* drop too small frames */
2574         if (len < IEEE80211_MIN_ACTION_SIZE)
2575                 return RX_DROP_UNUSABLE;
2576
2577         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2578             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2579             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2580                 return RX_DROP_UNUSABLE;
2581
2582         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2583                 return RX_DROP_UNUSABLE;
2584
2585         switch (mgmt->u.action.category) {
2586         case WLAN_CATEGORY_HT:
2587                 /* reject HT action frames from stations not supporting HT */
2588                 if (!rx->sta->sta.ht_cap.ht_supported)
2589                         goto invalid;
2590
2591                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2592                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2593                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2594                     sdata->vif.type != NL80211_IFTYPE_AP &&
2595                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2596                         break;
2597
2598                 /* verify action & smps_control/chanwidth are present */
2599                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2600                         goto invalid;
2601
2602                 switch (mgmt->u.action.u.ht_smps.action) {
2603                 case WLAN_HT_ACTION_SMPS: {
2604                         struct ieee80211_supported_band *sband;
2605                         enum ieee80211_smps_mode smps_mode;
2606
2607                         /* convert to HT capability */
2608                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2609                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2610                                 smps_mode = IEEE80211_SMPS_OFF;
2611                                 break;
2612                         case WLAN_HT_SMPS_CONTROL_STATIC:
2613                                 smps_mode = IEEE80211_SMPS_STATIC;
2614                                 break;
2615                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2616                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2617                                 break;
2618                         default:
2619                                 goto invalid;
2620                         }
2621
2622                         /* if no change do nothing */
2623                         if (rx->sta->sta.smps_mode == smps_mode)
2624                                 goto handled;
2625                         rx->sta->sta.smps_mode = smps_mode;
2626
2627                         sband = rx->local->hw.wiphy->bands[status->band];
2628
2629                         rate_control_rate_update(local, sband, rx->sta,
2630                                                  IEEE80211_RC_SMPS_CHANGED);
2631                         goto handled;
2632                 }
2633                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2634                         struct ieee80211_supported_band *sband;
2635                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2636                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
2637
2638                         /* If it doesn't support 40 MHz it can't change ... */
2639                         if (!(rx->sta->sta.ht_cap.cap &
2640                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2641                                 goto handled;
2642
2643                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2644                                 max_bw = IEEE80211_STA_RX_BW_20;
2645                         else
2646                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2647
2648                         /* set cur_max_bandwidth and recalc sta bw */
2649                         rx->sta->cur_max_bandwidth = max_bw;
2650                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2651
2652                         if (rx->sta->sta.bandwidth == new_bw)
2653                                 goto handled;
2654
2655                         rx->sta->sta.bandwidth = new_bw;
2656                         sband = rx->local->hw.wiphy->bands[status->band];
2657
2658                         rate_control_rate_update(local, sband, rx->sta,
2659                                                  IEEE80211_RC_BW_CHANGED);
2660                         goto handled;
2661                 }
2662                 default:
2663                         goto invalid;
2664                 }
2665
2666                 break;
2667         case WLAN_CATEGORY_PUBLIC:
2668                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2669                         goto invalid;
2670                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2671                         break;
2672                 if (!rx->sta)
2673                         break;
2674                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2675                         break;
2676                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2677                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2678                         break;
2679                 if (len < offsetof(struct ieee80211_mgmt,
2680                                    u.action.u.ext_chan_switch.variable))
2681                         goto invalid;
2682                 goto queue;
2683         case WLAN_CATEGORY_VHT:
2684                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2685                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2686                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2687                     sdata->vif.type != NL80211_IFTYPE_AP &&
2688                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2689                         break;
2690
2691                 /* verify action code is present */
2692                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2693                         goto invalid;
2694
2695                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2696                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2697                         u8 opmode;
2698
2699                         /* verify opmode is present */
2700                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2701                                 goto invalid;
2702
2703                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2704
2705                         ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2706                                                     opmode, status->band,
2707                                                     false);
2708                         goto handled;
2709                 }
2710                 default:
2711                         break;
2712                 }
2713                 break;
2714         case WLAN_CATEGORY_BACK:
2715                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2716                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2717                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2718                     sdata->vif.type != NL80211_IFTYPE_AP &&
2719                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2720                         break;
2721
2722                 /* verify action_code is present */
2723                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2724                         break;
2725
2726                 switch (mgmt->u.action.u.addba_req.action_code) {
2727                 case WLAN_ACTION_ADDBA_REQ:
2728                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2729                                    sizeof(mgmt->u.action.u.addba_req)))
2730                                 goto invalid;
2731                         break;
2732                 case WLAN_ACTION_ADDBA_RESP:
2733                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2734                                    sizeof(mgmt->u.action.u.addba_resp)))
2735                                 goto invalid;
2736                         break;
2737                 case WLAN_ACTION_DELBA:
2738                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2739                                    sizeof(mgmt->u.action.u.delba)))
2740                                 goto invalid;
2741                         break;
2742                 default:
2743                         goto invalid;
2744                 }
2745
2746                 goto queue;
2747         case WLAN_CATEGORY_SPECTRUM_MGMT:
2748                 /* verify action_code is present */
2749                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2750                         break;
2751
2752                 switch (mgmt->u.action.u.measurement.action_code) {
2753                 case WLAN_ACTION_SPCT_MSR_REQ:
2754                         if (status->band != IEEE80211_BAND_5GHZ)
2755                                 break;
2756
2757                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2758                                    sizeof(mgmt->u.action.u.measurement)))
2759                                 break;
2760
2761                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2762                                 break;
2763
2764                         ieee80211_process_measurement_req(sdata, mgmt, len);
2765                         goto handled;
2766                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2767                         u8 *bssid;
2768                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2769                                    sizeof(mgmt->u.action.u.chan_switch)))
2770                                 break;
2771
2772                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2773                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2774                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2775                                 break;
2776
2777                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2778                                 bssid = sdata->u.mgd.bssid;
2779                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2780                                 bssid = sdata->u.ibss.bssid;
2781                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2782                                 bssid = mgmt->sa;
2783                         else
2784                                 break;
2785
2786                         if (!ether_addr_equal(mgmt->bssid, bssid))
2787                                 break;
2788
2789                         goto queue;
2790                         }
2791                 }
2792                 break;
2793         case WLAN_CATEGORY_SA_QUERY:
2794                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2795                            sizeof(mgmt->u.action.u.sa_query)))
2796                         break;
2797
2798                 switch (mgmt->u.action.u.sa_query.action) {
2799                 case WLAN_ACTION_SA_QUERY_REQUEST:
2800                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2801                                 break;
2802                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2803                         goto handled;
2804                 }
2805                 break;
2806         case WLAN_CATEGORY_SELF_PROTECTED:
2807                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2808                            sizeof(mgmt->u.action.u.self_prot.action_code)))
2809                         break;
2810
2811                 switch (mgmt->u.action.u.self_prot.action_code) {
2812                 case WLAN_SP_MESH_PEERING_OPEN:
2813                 case WLAN_SP_MESH_PEERING_CLOSE:
2814                 case WLAN_SP_MESH_PEERING_CONFIRM:
2815                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2816                                 goto invalid;
2817                         if (sdata->u.mesh.user_mpm)
2818                                 /* userspace handles this frame */
2819                                 break;
2820                         goto queue;
2821                 case WLAN_SP_MGK_INFORM:
2822                 case WLAN_SP_MGK_ACK:
2823                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2824                                 goto invalid;
2825                         break;
2826                 }
2827                 break;
2828         case WLAN_CATEGORY_MESH_ACTION:
2829                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2830                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
2831                         break;
2832
2833                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2834                         break;
2835                 if (mesh_action_is_path_sel(mgmt) &&
2836                     !mesh_path_sel_is_hwmp(sdata))
2837                         break;
2838                 goto queue;
2839         }
2840
2841         return RX_CONTINUE;
2842
2843  invalid:
2844         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2845         /* will return in the next handlers */
2846         return RX_CONTINUE;
2847
2848  handled:
2849         if (rx->sta)
2850                 rx->sta->rx_packets++;
2851         dev_kfree_skb(rx->skb);
2852         return RX_QUEUED;
2853
2854  queue:
2855         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2856         skb_queue_tail(&sdata->skb_queue, rx->skb);
2857         ieee80211_queue_work(&local->hw, &sdata->work);
2858         if (rx->sta)
2859                 rx->sta->rx_packets++;
2860         return RX_QUEUED;
2861 }
2862
2863 static ieee80211_rx_result debug_noinline
2864 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2865 {
2866         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2867         int sig = 0;
2868
2869         /* skip known-bad action frames and return them in the next handler */
2870         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2871                 return RX_CONTINUE;
2872
2873         /*
2874          * Getting here means the kernel doesn't know how to handle
2875          * it, but maybe userspace does ... include returned frames
2876          * so userspace can register for those to know whether ones
2877          * it transmitted were processed or returned.
2878          */
2879
2880         if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2881                 sig = status->signal;
2882
2883         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2884                              rx->skb->data, rx->skb->len, 0)) {
2885                 if (rx->sta)
2886                         rx->sta->rx_packets++;
2887                 dev_kfree_skb(rx->skb);
2888                 return RX_QUEUED;
2889         }
2890
2891         return RX_CONTINUE;
2892 }
2893
2894 static ieee80211_rx_result debug_noinline
2895 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2896 {
2897         struct ieee80211_local *local = rx->local;
2898         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2899         struct sk_buff *nskb;
2900         struct ieee80211_sub_if_data *sdata = rx->sdata;
2901         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2902
2903         if (!ieee80211_is_action(mgmt->frame_control))
2904                 return RX_CONTINUE;
2905
2906         /*
2907          * For AP mode, hostapd is responsible for handling any action
2908          * frames that we didn't handle, including returning unknown
2909          * ones. For all other modes we will return them to the sender,
2910          * setting the 0x80 bit in the action category, as required by
2911          * 802.11-2012 9.24.4.
2912          * Newer versions of hostapd shall also use the management frame
2913          * registration mechanisms, but older ones still use cooked
2914          * monitor interfaces so push all frames there.
2915          */
2916         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2917             (sdata->vif.type == NL80211_IFTYPE_AP ||
2918              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2919                 return RX_DROP_MONITOR;
2920
2921         if (is_multicast_ether_addr(mgmt->da))
2922                 return RX_DROP_MONITOR;
2923
2924         /* do not return rejected action frames */
2925         if (mgmt->u.action.category & 0x80)
2926                 return RX_DROP_UNUSABLE;
2927
2928         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2929                                GFP_ATOMIC);
2930         if (nskb) {
2931                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2932
2933                 nmgmt->u.action.category |= 0x80;
2934                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2935                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2936
2937                 memset(nskb->cb, 0, sizeof(nskb->cb));
2938
2939                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2940                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2941
2942                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2943                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2944                                       IEEE80211_TX_CTL_NO_CCK_RATE;
2945                         if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2946                                 info->hw_queue =
2947                                         local->hw.offchannel_tx_hw_queue;
2948                 }
2949
2950                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2951                                             status->band);
2952         }
2953         dev_kfree_skb(rx->skb);
2954         return RX_QUEUED;
2955 }
2956
2957 static ieee80211_rx_result debug_noinline
2958 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2959 {
2960         struct ieee80211_sub_if_data *sdata = rx->sdata;
2961         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2962         __le16 stype;
2963
2964         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2965
2966         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2967             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2968             sdata->vif.type != NL80211_IFTYPE_OCB &&
2969             sdata->vif.type != NL80211_IFTYPE_STATION)
2970                 return RX_DROP_MONITOR;
2971
2972         switch (stype) {
2973         case cpu_to_le16(IEEE80211_STYPE_AUTH):
2974         case cpu_to_le16(IEEE80211_STYPE_BEACON):
2975         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2976                 /* process for all: mesh, mlme, ibss */
2977                 break;
2978         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2979         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2980         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2981         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2982                 if (is_multicast_ether_addr(mgmt->da) &&
2983                     !is_broadcast_ether_addr(mgmt->da))
2984                         return RX_DROP_MONITOR;
2985
2986                 /* process only for station */
2987                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2988                         return RX_DROP_MONITOR;
2989                 break;
2990         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2991                 /* process only for ibss and mesh */
2992                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2993                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2994                         return RX_DROP_MONITOR;
2995                 break;
2996         default:
2997                 return RX_DROP_MONITOR;
2998         }
2999
3000         /* queue up frame and kick off work to process it */
3001         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3002         skb_queue_tail(&sdata->skb_queue, rx->skb);
3003         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3004         if (rx->sta)
3005                 rx->sta->rx_packets++;
3006
3007         return RX_QUEUED;
3008 }
3009
3010 /* TODO: use IEEE80211_RX_FRAGMENTED */
3011 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3012                                         struct ieee80211_rate *rate)
3013 {
3014         struct ieee80211_sub_if_data *sdata;
3015         struct ieee80211_local *local = rx->local;
3016         struct sk_buff *skb = rx->skb, *skb2;
3017         struct net_device *prev_dev = NULL;
3018         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3019         int needed_headroom;
3020
3021         /*
3022          * If cooked monitor has been processed already, then
3023          * don't do it again. If not, set the flag.
3024          */
3025         if (rx->flags & IEEE80211_RX_CMNTR)
3026                 goto out_free_skb;
3027         rx->flags |= IEEE80211_RX_CMNTR;
3028
3029         /* If there are no cooked monitor interfaces, just free the SKB */
3030         if (!local->cooked_mntrs)
3031                 goto out_free_skb;
3032
3033         /* vendor data is long removed here */
3034         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3035         /* room for the radiotap header based on driver features */
3036         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3037
3038         if (skb_headroom(skb) < needed_headroom &&
3039             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3040                 goto out_free_skb;
3041
3042         /* prepend radiotap information */
3043         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3044                                          false);
3045
3046         skb_set_mac_header(skb, 0);
3047         skb->ip_summed = CHECKSUM_UNNECESSARY;
3048         skb->pkt_type = PACKET_OTHERHOST;
3049         skb->protocol = htons(ETH_P_802_2);
3050
3051         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3052                 if (!ieee80211_sdata_running(sdata))
3053                         continue;
3054
3055                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3056                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
3057                         continue;
3058
3059                 if (prev_dev) {
3060                         skb2 = skb_clone(skb, GFP_ATOMIC);
3061                         if (skb2) {
3062                                 skb2->dev = prev_dev;
3063                                 netif_receive_skb(skb2);
3064                         }
3065                 }
3066
3067                 prev_dev = sdata->dev;
3068                 sdata->dev->stats.rx_packets++;
3069                 sdata->dev->stats.rx_bytes += skb->len;
3070         }
3071
3072         if (prev_dev) {
3073                 skb->dev = prev_dev;
3074                 netif_receive_skb(skb);
3075                 return;
3076         }
3077
3078  out_free_skb:
3079         dev_kfree_skb(skb);
3080 }
3081
3082 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3083                                          ieee80211_rx_result res)
3084 {
3085         switch (res) {
3086         case RX_DROP_MONITOR:
3087                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3088                 if (rx->sta)
3089                         rx->sta->rx_dropped++;
3090                 /* fall through */
3091         case RX_CONTINUE: {
3092                 struct ieee80211_rate *rate = NULL;
3093                 struct ieee80211_supported_band *sband;
3094                 struct ieee80211_rx_status *status;
3095
3096                 status = IEEE80211_SKB_RXCB((rx->skb));
3097
3098                 sband = rx->local->hw.wiphy->bands[status->band];
3099                 if (!(status->flag & RX_FLAG_HT) &&
3100                     !(status->flag & RX_FLAG_VHT))
3101                         rate = &sband->bitrates[status->rate_idx];
3102
3103                 ieee80211_rx_cooked_monitor(rx, rate);
3104                 break;
3105                 }
3106         case RX_DROP_UNUSABLE:
3107                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3108                 if (rx->sta)
3109                         rx->sta->rx_dropped++;
3110                 dev_kfree_skb(rx->skb);
3111                 break;
3112         case RX_QUEUED:
3113                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3114                 break;
3115         }
3116 }
3117
3118 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3119                                   struct sk_buff_head *frames)
3120 {
3121         ieee80211_rx_result res = RX_DROP_MONITOR;
3122         struct sk_buff *skb;
3123
3124 #define CALL_RXH(rxh)                   \
3125         do {                            \
3126                 res = rxh(rx);          \
3127                 if (res != RX_CONTINUE) \
3128                         goto rxh_next;  \
3129         } while (0);
3130
3131         spin_lock_bh(&rx->local->rx_path_lock);
3132
3133         while ((skb = __skb_dequeue(frames))) {
3134                 /*
3135                  * all the other fields are valid across frames
3136                  * that belong to an aMPDU since they are on the
3137                  * same TID from the same station
3138                  */
3139                 rx->skb = skb;
3140
3141                 CALL_RXH(ieee80211_rx_h_check_more_data)
3142                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
3143                 CALL_RXH(ieee80211_rx_h_sta_process)
3144                 CALL_RXH(ieee80211_rx_h_decrypt)
3145                 CALL_RXH(ieee80211_rx_h_defragment)
3146                 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
3147                 /* must be after MMIC verify so header is counted in MPDU mic */
3148 #ifdef CONFIG_MAC80211_MESH
3149                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3150                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3151 #endif
3152                 CALL_RXH(ieee80211_rx_h_amsdu)
3153                 CALL_RXH(ieee80211_rx_h_data)
3154
3155                 /* special treatment -- needs the queue */
3156                 res = ieee80211_rx_h_ctrl(rx, frames);
3157                 if (res != RX_CONTINUE)
3158                         goto rxh_next;
3159
3160                 CALL_RXH(ieee80211_rx_h_mgmt_check)
3161                 CALL_RXH(ieee80211_rx_h_action)
3162                 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
3163                 CALL_RXH(ieee80211_rx_h_action_return)
3164                 CALL_RXH(ieee80211_rx_h_mgmt)
3165
3166  rxh_next:
3167                 ieee80211_rx_handlers_result(rx, res);
3168
3169 #undef CALL_RXH
3170         }
3171
3172         spin_unlock_bh(&rx->local->rx_path_lock);
3173 }
3174
3175 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3176 {
3177         struct sk_buff_head reorder_release;
3178         ieee80211_rx_result res = RX_DROP_MONITOR;
3179
3180         __skb_queue_head_init(&reorder_release);
3181
3182 #define CALL_RXH(rxh)                   \
3183         do {                            \
3184                 res = rxh(rx);          \
3185                 if (res != RX_CONTINUE) \
3186                         goto rxh_next;  \
3187         } while (0);
3188
3189         CALL_RXH(ieee80211_rx_h_check_dup)
3190         CALL_RXH(ieee80211_rx_h_check)
3191
3192         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3193
3194         ieee80211_rx_handlers(rx, &reorder_release);
3195         return;
3196
3197  rxh_next:
3198         ieee80211_rx_handlers_result(rx, res);
3199
3200 #undef CALL_RXH
3201 }
3202
3203 /*
3204  * This function makes calls into the RX path, therefore
3205  * it has to be invoked under RCU read lock.
3206  */
3207 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3208 {
3209         struct sk_buff_head frames;
3210         struct ieee80211_rx_data rx = {
3211                 .sta = sta,
3212                 .sdata = sta->sdata,
3213                 .local = sta->local,
3214                 /* This is OK -- must be QoS data frame */
3215                 .security_idx = tid,
3216                 .seqno_idx = tid,
3217                 .flags = 0,
3218         };
3219         struct tid_ampdu_rx *tid_agg_rx;
3220
3221         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3222         if (!tid_agg_rx)
3223                 return;
3224
3225         __skb_queue_head_init(&frames);
3226
3227         spin_lock(&tid_agg_rx->reorder_lock);
3228         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3229         spin_unlock(&tid_agg_rx->reorder_lock);
3230
3231         ieee80211_rx_handlers(&rx, &frames);
3232 }
3233
3234 /* main receive path */
3235
3236 static bool prepare_for_handlers(struct ieee80211_rx_data *rx,
3237                                  struct ieee80211_hdr *hdr)
3238 {
3239         struct ieee80211_sub_if_data *sdata = rx->sdata;
3240         struct sk_buff *skb = rx->skb;
3241         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3242         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3243         int multicast = is_multicast_ether_addr(hdr->addr1);
3244
3245         switch (sdata->vif.type) {
3246         case NL80211_IFTYPE_STATION:
3247                 if (!bssid && !sdata->u.mgd.use_4addr)
3248                         return false;
3249                 if (!multicast &&
3250                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3251                         if (!(sdata->dev->flags & IFF_PROMISC) ||
3252                             sdata->u.mgd.use_4addr)
3253                                 return false;
3254                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3255                 }
3256                 break;
3257         case NL80211_IFTYPE_ADHOC:
3258                 if (!bssid)
3259                         return false;
3260                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3261                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3262                         return false;
3263                 if (ieee80211_is_beacon(hdr->frame_control)) {
3264                         return true;
3265                 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3266                         return false;
3267                 } else if (!multicast &&
3268                            !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3269                         if (!(sdata->dev->flags & IFF_PROMISC))
3270                                 return false;
3271                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3272                 } else if (!rx->sta) {
3273                         int rate_idx;
3274                         if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3275                                 rate_idx = 0; /* TODO: HT/VHT rates */
3276                         else
3277                                 rate_idx = status->rate_idx;
3278                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3279                                                  BIT(rate_idx));
3280                 }
3281                 break;
3282         case NL80211_IFTYPE_OCB:
3283                 if (!bssid)
3284                         return false;
3285                 if (ieee80211_is_beacon(hdr->frame_control)) {
3286                         return false;
3287                 } else if (!is_broadcast_ether_addr(bssid)) {
3288                         ocb_dbg(sdata, "BSSID mismatch in OCB mode!\n");
3289                         return false;
3290                 } else if (!multicast &&
3291                            !ether_addr_equal(sdata->dev->dev_addr,
3292                                              hdr->addr1)) {
3293                         /* if we are in promisc mode we also accept
3294                          * packets not destined for us
3295                          */
3296                         if (!(sdata->dev->flags & IFF_PROMISC))
3297                                 return false;
3298                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
3299                 } else if (!rx->sta) {
3300                         int rate_idx;
3301                         if (status->flag & RX_FLAG_HT)
3302                                 rate_idx = 0; /* TODO: HT rates */
3303                         else
3304                                 rate_idx = status->rate_idx;
3305                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3306                                                 BIT(rate_idx));
3307                 }
3308                 break;
3309         case NL80211_IFTYPE_MESH_POINT:
3310                 if (!multicast &&
3311                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3312                         if (!(sdata->dev->flags & IFF_PROMISC))
3313                                 return false;
3314
3315                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3316                 }
3317                 break;
3318         case NL80211_IFTYPE_AP_VLAN:
3319         case NL80211_IFTYPE_AP:
3320                 if (!bssid) {
3321                         if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3322                                 return false;
3323                 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3324                         /*
3325                          * Accept public action frames even when the
3326                          * BSSID doesn't match, this is used for P2P
3327                          * and location updates. Note that mac80211
3328                          * itself never looks at these frames.
3329                          */
3330                         if (!multicast &&
3331                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3332                                 return false;
3333                         if (ieee80211_is_public_action(hdr, skb->len))
3334                                 return true;
3335                         if (!ieee80211_is_beacon(hdr->frame_control))
3336                                 return false;
3337                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3338                 } else if (!ieee80211_has_tods(hdr->frame_control)) {
3339                         /* ignore data frames to TDLS-peers */
3340                         if (ieee80211_is_data(hdr->frame_control))
3341                                 return false;
3342                         /* ignore action frames to TDLS-peers */
3343                         if (ieee80211_is_action(hdr->frame_control) &&
3344                             !ether_addr_equal(bssid, hdr->addr1))
3345                                 return false;
3346                 }
3347                 break;
3348         case NL80211_IFTYPE_WDS:
3349                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3350                         return false;
3351                 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3352                         return false;
3353                 break;
3354         case NL80211_IFTYPE_P2P_DEVICE:
3355                 if (!ieee80211_is_public_action(hdr, skb->len) &&
3356                     !ieee80211_is_probe_req(hdr->frame_control) &&
3357                     !ieee80211_is_probe_resp(hdr->frame_control) &&
3358                     !ieee80211_is_beacon(hdr->frame_control))
3359                         return false;
3360                 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3361                     !multicast)
3362                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3363                 break;
3364         default:
3365                 /* should never get here */
3366                 WARN_ON_ONCE(1);
3367                 break;
3368         }
3369
3370         return true;
3371 }
3372
3373 /*
3374  * This function returns whether or not the SKB
3375  * was destined for RX processing or not, which,
3376  * if consume is true, is equivalent to whether
3377  * or not the skb was consumed.
3378  */
3379 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3380                                             struct sk_buff *skb, bool consume)
3381 {
3382         struct ieee80211_local *local = rx->local;
3383         struct ieee80211_sub_if_data *sdata = rx->sdata;
3384         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3385         struct ieee80211_hdr *hdr = (void *)skb->data;
3386
3387         rx->skb = skb;
3388         status->rx_flags |= IEEE80211_RX_RA_MATCH;
3389
3390         if (!prepare_for_handlers(rx, hdr))
3391                 return false;
3392
3393         if (!consume) {
3394                 skb = skb_copy(skb, GFP_ATOMIC);
3395                 if (!skb) {
3396                         if (net_ratelimit())
3397                                 wiphy_debug(local->hw.wiphy,
3398                                         "failed to copy skb for %s\n",
3399                                         sdata->name);
3400                         return true;
3401                 }
3402
3403                 rx->skb = skb;
3404         }
3405
3406         ieee80211_invoke_rx_handlers(rx);
3407         return true;
3408 }
3409
3410 /*
3411  * This is the actual Rx frames handler. as it belongs to Rx path it must
3412  * be called with rcu_read_lock protection.
3413  */
3414 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3415                                          struct sk_buff *skb)
3416 {
3417         struct ieee80211_local *local = hw_to_local(hw);
3418         struct ieee80211_sub_if_data *sdata;
3419         struct ieee80211_hdr *hdr;
3420         __le16 fc;
3421         struct ieee80211_rx_data rx;
3422         struct ieee80211_sub_if_data *prev;
3423         struct sta_info *sta, *tmp, *prev_sta;
3424         int err = 0;
3425
3426         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3427         memset(&rx, 0, sizeof(rx));
3428         rx.skb = skb;
3429         rx.local = local;
3430
3431         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3432                 local->dot11ReceivedFragmentCount++;
3433
3434         if (ieee80211_is_mgmt(fc)) {
3435                 /* drop frame if too short for header */
3436                 if (skb->len < ieee80211_hdrlen(fc))
3437                         err = -ENOBUFS;
3438                 else
3439                         err = skb_linearize(skb);
3440         } else {
3441                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3442         }
3443
3444         if (err) {
3445                 dev_kfree_skb(skb);
3446                 return;
3447         }
3448
3449         hdr = (struct ieee80211_hdr *)skb->data;
3450         ieee80211_parse_qos(&rx);
3451         ieee80211_verify_alignment(&rx);
3452
3453         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3454                      ieee80211_is_beacon(hdr->frame_control)))
3455                 ieee80211_scan_rx(local, skb);
3456
3457         if (ieee80211_is_data(fc)) {
3458                 prev_sta = NULL;
3459
3460                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
3461                         if (!prev_sta) {
3462                                 prev_sta = sta;
3463                                 continue;
3464                         }
3465
3466                         rx.sta = prev_sta;
3467                         rx.sdata = prev_sta->sdata;
3468                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
3469
3470                         prev_sta = sta;
3471                 }
3472
3473                 if (prev_sta) {
3474                         rx.sta = prev_sta;
3475                         rx.sdata = prev_sta->sdata;
3476
3477                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3478                                 return;
3479                         goto out;
3480                 }
3481         }
3482
3483         prev = NULL;
3484
3485         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3486                 if (!ieee80211_sdata_running(sdata))
3487                         continue;
3488
3489                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3490                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3491                         continue;
3492
3493                 /*
3494                  * frame is destined for this interface, but if it's
3495                  * not also for the previous one we handle that after
3496                  * the loop to avoid copying the SKB once too much
3497                  */
3498
3499                 if (!prev) {
3500                         prev = sdata;
3501                         continue;
3502                 }
3503
3504                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3505                 rx.sdata = prev;
3506                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3507
3508                 prev = sdata;
3509         }
3510
3511         if (prev) {
3512                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3513                 rx.sdata = prev;
3514
3515                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3516                         return;
3517         }
3518
3519  out:
3520         dev_kfree_skb(skb);
3521 }
3522
3523 /*
3524  * This is the receive path handler. It is called by a low level driver when an
3525  * 802.11 MPDU is received from the hardware.
3526  */
3527 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3528 {
3529         struct ieee80211_local *local = hw_to_local(hw);
3530         struct ieee80211_rate *rate = NULL;
3531         struct ieee80211_supported_band *sband;
3532         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3533
3534         WARN_ON_ONCE(softirq_count() == 0);
3535
3536         if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3537                 goto drop;
3538
3539         sband = local->hw.wiphy->bands[status->band];
3540         if (WARN_ON(!sband))
3541                 goto drop;
3542
3543         /*
3544          * If we're suspending, it is possible although not too likely
3545          * that we'd be receiving frames after having already partially
3546          * quiesced the stack. We can't process such frames then since
3547          * that might, for example, cause stations to be added or other
3548          * driver callbacks be invoked.
3549          */
3550         if (unlikely(local->quiescing || local->suspended))
3551                 goto drop;
3552
3553         /* We might be during a HW reconfig, prevent Rx for the same reason */
3554         if (unlikely(local->in_reconfig))
3555                 goto drop;
3556
3557         /*
3558          * The same happens when we're not even started,
3559          * but that's worth a warning.
3560          */
3561         if (WARN_ON(!local->started))
3562                 goto drop;
3563
3564         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3565                 /*
3566                  * Validate the rate, unless a PLCP error means that
3567                  * we probably can't have a valid rate here anyway.
3568                  */
3569
3570                 if (status->flag & RX_FLAG_HT) {
3571                         /*
3572                          * rate_idx is MCS index, which can be [0-76]
3573                          * as documented on:
3574                          *
3575                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3576                          *
3577                          * Anything else would be some sort of driver or
3578                          * hardware error. The driver should catch hardware
3579                          * errors.
3580                          */
3581                         if (WARN(status->rate_idx > 76,
3582                                  "Rate marked as an HT rate but passed "
3583                                  "status->rate_idx is not "
3584                                  "an MCS index [0-76]: %d (0x%02x)\n",
3585                                  status->rate_idx,
3586                                  status->rate_idx))
3587                                 goto drop;
3588                 } else if (status->flag & RX_FLAG_VHT) {
3589                         if (WARN_ONCE(status->rate_idx > 9 ||
3590                                       !status->vht_nss ||
3591                                       status->vht_nss > 8,
3592                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3593                                       status->rate_idx, status->vht_nss))
3594                                 goto drop;
3595                 } else {
3596                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3597                                 goto drop;
3598                         rate = &sband->bitrates[status->rate_idx];
3599                 }
3600         }
3601
3602         status->rx_flags = 0;
3603
3604         /*
3605          * key references and virtual interfaces are protected using RCU
3606          * and this requires that we are in a read-side RCU section during
3607          * receive processing
3608          */
3609         rcu_read_lock();
3610
3611         /*
3612          * Frames with failed FCS/PLCP checksum are not returned,
3613          * all other frames are returned without radiotap header
3614          * if it was previously present.
3615          * Also, frames with less than 16 bytes are dropped.
3616          */
3617         skb = ieee80211_rx_monitor(local, skb, rate);
3618         if (!skb) {
3619                 rcu_read_unlock();
3620                 return;
3621         }
3622
3623         ieee80211_tpt_led_trig_rx(local,
3624                         ((struct ieee80211_hdr *)skb->data)->frame_control,
3625                         skb->len);
3626         __ieee80211_rx_handle_packet(hw, skb);
3627
3628         rcu_read_unlock();
3629
3630         return;
3631  drop:
3632         kfree_skb(skb);
3633 }
3634 EXPORT_SYMBOL(ieee80211_rx);
3635
3636 /* This is a version of the rx handler that can be called from hard irq
3637  * context. Post the skb on the queue and schedule the tasklet */
3638 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3639 {
3640         struct ieee80211_local *local = hw_to_local(hw);
3641
3642         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3643
3644         skb->pkt_type = IEEE80211_RX_MSG;
3645         skb_queue_tail(&local->skb_queue, skb);
3646         tasklet_schedule(&local->tasklet);
3647 }
3648 EXPORT_SYMBOL(ieee80211_rx_irqsafe);