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_OFDM | 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                 /* known field - how to handle 80+80? */
 365                 if (status->vht_flag & RX_VHT_FLAG_80P80MHZ)
 366                         known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 367                 put_unaligned_le16(known, pos);
 368                 pos += 2;
 369                 /* flags */
 370                 if (status->flag & RX_FLAG_SHORT_GI)
 371                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 372                 /* in VHT, STBC is binary */
 373                 if (status->flag & RX_FLAG_STBC_MASK)
 374                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
 375                 if (status->vht_flag & RX_VHT_FLAG_BF)
 376                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
 377                 pos++;
 378                 /* bandwidth */
 379                 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
 380                         *pos++ = 4;
 381                 else if (status->vht_flag & RX_VHT_FLAG_80P80MHZ)
 382                         *pos++ = 0; /* marked not known above */
 383                 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
 384                         *pos++ = 11;
 385                 else if (status->flag & RX_FLAG_40MHZ)
 386                         *pos++ = 1;
 387                 else /* 20 MHz */
 388                         *pos++ = 0;
 389                 /* MCS/NSS */
 390                 *pos = (status->rate_idx << 4) | status->vht_nss;
 391                 pos += 4;
 392                 /* coding field */
 393                 if (status->flag & RX_FLAG_LDPC)
 394                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
 395                 pos++;
 396                 /* group ID */
 397                 pos++;
 398                 /* partial_aid */
 399                 pos += 2;
 400         }
 401
 402         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 403                 *pos++ = status->chain_signal[chain];
 404                 *pos++ = chain;
 405         }
 406
 407         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 408                 /* ensure 2 byte alignment for the vendor field as required */
 409                 if ((pos - (u8 *)rthdr) & 1)
 410                         *pos++ = 0;
 411                 *pos++ = rtap.oui[0];
 412                 *pos++ = rtap.oui[1];
 413                 *pos++ = rtap.oui[2];
 414                 *pos++ = rtap.subns;
 415                 put_unaligned_le16(rtap.len, pos);
 416                 pos += 2;
 417                 /* align the actual payload as requested */
 418                 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
 419                         *pos++ = 0;
 420                 /* data (and possible padding) already follows */
 421         }
 422 }
 423
 424 /*
 425  * This function copies a received frame to all monitor interfaces and
 426  * returns a cleaned-up SKB that no longer includes the FCS nor the
 427  * radiotap header the driver might have added.
 428  */
 429 static struct sk_buff *
 430 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 431                      struct ieee80211_rate *rate)
 432 {
 433         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 434         struct ieee80211_sub_if_data *sdata;
 435         int rt_hdrlen, needed_headroom;
 436         struct sk_buff *skb, *skb2;
 437         struct net_device *prev_dev = NULL;
 438         int present_fcs_len = 0;
 439         unsigned int rtap_vendor_space = 0;
 440
 441         if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
 442                 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
 443
 444                 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
 445         }
 446
 447         /*
 448          * First, we may need to make a copy of the skb because
 449          *  (1) we need to modify it for radiotap (if not present), and
 450          *  (2) the other RX handlers will modify the skb we got.
 451          *
 452          * We don't need to, of course, if we aren't going to return
 453          * the SKB because it has a bad FCS/PLCP checksum.
 454          */
 455
 456         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
 457                 present_fcs_len = FCS_LEN;
 458
 459         /* ensure hdr->frame_control and vendor radiotap data are in skb head */
 460         if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
 461                 dev_kfree_skb(origskb);
 462                 return NULL;
 463         }
 464
 465         if (!local->monitors) {
 466                 if (should_drop_frame(origskb, present_fcs_len,
 467                                       rtap_vendor_space)) {
 468                         dev_kfree_skb(origskb);
 469                         return NULL;
 470                 }
 471
 472                 return remove_monitor_info(local, origskb, rtap_vendor_space);
 473         }
 474
 475         /* room for the radiotap header based on driver features */
 476         rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
 477         needed_headroom = rt_hdrlen - rtap_vendor_space;
 478
 479         if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) {
 480                 /* only need to expand headroom if necessary */
 481                 skb = origskb;
 482                 origskb = NULL;
 483
 484                 /*
 485                  * This shouldn't trigger often because most devices have an
 486                  * RX header they pull before we get here, and that should
 487                  * be big enough for our radiotap information. We should
 488                  * probably export the length to drivers so that we can have
 489                  * them allocate enough headroom to start with.
 490                  */
 491                 if (skb_headroom(skb) < needed_headroom &&
 492                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 493                         dev_kfree_skb(skb);
 494                         return NULL;
 495                 }
 496         } else {
 497                 /*
 498                  * Need to make a copy and possibly remove radiotap header
 499                  * and FCS from the original.
 500                  */
 501                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
 502
 503                 origskb = remove_monitor_info(local, origskb,
 504                                               rtap_vendor_space);
 505
 506                 if (!skb)
 507                         return origskb;
 508         }
 509
 510         /* prepend radiotap information */
 511         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
 512
 513         skb_reset_mac_header(skb);
 514         skb->ip_summed = CHECKSUM_UNNECESSARY;
 515         skb->pkt_type = PACKET_OTHERHOST;
 516         skb->protocol = htons(ETH_P_802_2);
 517
 518         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 519                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
 520                         continue;
 521
 522                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
 523                         continue;
 524
 525                 if (!ieee80211_sdata_running(sdata))
 526                         continue;
 527
 528                 if (prev_dev) {
 529                         skb2 = skb_clone(skb, GFP_ATOMIC);
 530                         if (skb2) {
 531                                 skb2->dev = prev_dev;
 532                                 netif_receive_skb(skb2);
 533                         }
 534                 }
 535
 536                 prev_dev = sdata->dev;
 537                 sdata->dev->stats.rx_packets++;
 538                 sdata->dev->stats.rx_bytes += skb->len;
 539         }
 540
 541         if (prev_dev) {
 542                 skb->dev = prev_dev;
 543                 netif_receive_skb(skb);
 544         } else
 545                 dev_kfree_skb(skb);
 546
 547         return origskb;
 548 }
 549
 550 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 551 {
 552         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 553         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 554         int tid, seqno_idx, security_idx;
 555
 556         /* does the frame have a qos control field? */
 557         if (ieee80211_is_data_qos(hdr->frame_control)) {
 558                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 559                 /* frame has qos control */
 560                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 561                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 562                         status->rx_flags |= IEEE80211_RX_AMSDU;
 563
 564                 seqno_idx = tid;
 565                 security_idx = tid;
 566         } else {
 567                 /*
 568                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 569                  *
 570                  *      Sequence numbers for management frames, QoS data
 571                  *      frames with a broadcast/multicast address in the
 572                  *      Address 1 field, and all non-QoS data frames sent
 573                  *      by QoS STAs are assigned using an additional single
 574                  *      modulo-4096 counter, [...]
 575                  *
 576                  * We also use that counter for non-QoS STAs.
 577                  */
 578                 seqno_idx = IEEE80211_NUM_TIDS;
 579                 security_idx = 0;
 580                 if (ieee80211_is_mgmt(hdr->frame_control))
 581                         security_idx = IEEE80211_NUM_TIDS;
 582                 tid = 0;
 583         }
 584
 585         rx->seqno_idx = seqno_idx;
 586         rx->security_idx = security_idx;
 587         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 588          * For now, set skb->priority to 0 for other cases. */
 589         rx->skb->priority = (tid > 7) ? 0 : tid;
 590 }
 591
 592 /**
 593  * DOC: Packet alignment
 594  *
 595  * Drivers always need to pass packets that are aligned to two-byte boundaries
 596  * to the stack.
 597  *
 598  * Additionally, should, if possible, align the payload data in a way that
 599  * guarantees that the contained IP header is aligned to a four-byte
 600  * boundary. In the case of regular frames, this simply means aligning the
 601  * payload to a four-byte boundary (because either the IP header is directly
 602  * contained, or IV/RFC1042 headers that have a length divisible by four are
 603  * in front of it).  If the payload data is not properly aligned and the
 604  * architecture doesn't support efficient unaligned operations, mac80211
 605  * will align the data.
 606  *
 607  * With A-MSDU frames, however, the payload data address must yield two modulo
 608  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 609  * push the IP header further back to a multiple of four again. Thankfully, the
 610  * specs were sane enough this time around to require padding each A-MSDU
 611  * subframe to a length that is a multiple of four.
 612  *
 613  * Padding like Atheros hardware adds which is between the 802.11 header and
 614  * the payload is not supported, the driver is required to move the 802.11
 615  * header to be directly in front of the payload in that case.
 616  */
 617 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 618 {
 619 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 620         WARN_ONCE((unsigned long)rx->skb->data & 1,
 621                   "unaligned packet at 0x%p\n", rx->skb->data);
 622 #endif
 623 }
 624
 625
 626 /* rx handlers */
 627
 628 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 629 {
 630         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 631
 632         if (is_multicast_ether_addr(hdr->addr1))
 633                 return 0;
 634
 635         return ieee80211_is_robust_mgmt_frame(skb);
 636 }
 637
 638
 639 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 640 {
 641         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 642
 643         if (!is_multicast_ether_addr(hdr->addr1))
 644                 return 0;
 645
 646         return ieee80211_is_robust_mgmt_frame(skb);
 647 }
 648
 649
 650 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 651 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 652 {
 653         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 654         struct ieee80211_mmie *mmie;
 655
 656         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 657                 return -1;
 658
 659         if (!ieee80211_is_robust_mgmt_frame(skb))
 660                 return -1; /* not a robust management frame */
 661
 662         mmie = (struct ieee80211_mmie *)
 663                 (skb->data + skb->len - sizeof(*mmie));
 664         if (mmie->element_id != WLAN_EID_MMIE ||
 665             mmie->length != sizeof(*mmie) - 2)
 666                 return -1;
 667
 668         return le16_to_cpu(mmie->key_id);
 669 }
 670
 671 static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
 672                                  struct sk_buff *skb)
 673 {
 674         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 675         __le16 fc;
 676         int hdrlen;
 677         u8 keyid;
 678
 679         fc = hdr->frame_control;
 680         hdrlen = ieee80211_hdrlen(fc);
 681
 682         if (skb->len < hdrlen + cs->hdr_len)
 683                 return -EINVAL;
 684
 685         skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
 686         keyid &= cs->key_idx_mask;
 687         keyid >>= cs->key_idx_shift;
 688
 689         return keyid;
 690 }
 691
 692 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
 693 {
 694         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 695         char *dev_addr = rx->sdata->vif.addr;
 696
 697         if (ieee80211_is_data(hdr->frame_control)) {
 698                 if (is_multicast_ether_addr(hdr->addr1)) {
 699                         if (ieee80211_has_tods(hdr->frame_control) ||
 700                             !ieee80211_has_fromds(hdr->frame_control))
 701                                 return RX_DROP_MONITOR;
 702                         if (ether_addr_equal(hdr->addr3, dev_addr))
 703                                 return RX_DROP_MONITOR;
 704                 } else {
 705                         if (!ieee80211_has_a4(hdr->frame_control))
 706                                 return RX_DROP_MONITOR;
 707                         if (ether_addr_equal(hdr->addr4, dev_addr))
 708                                 return RX_DROP_MONITOR;
 709                 }
 710         }
 711
 712         /* If there is not an established peer link and this is not a peer link
 713          * establisment frame, beacon or probe, drop the frame.
 714          */
 715
 716         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
 717                 struct ieee80211_mgmt *mgmt;
 718
 719                 if (!ieee80211_is_mgmt(hdr->frame_control))
 720                         return RX_DROP_MONITOR;
 721
 722                 if (ieee80211_is_action(hdr->frame_control)) {
 723                         u8 category;
 724
 725                         /* make sure category field is present */
 726                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
 727                                 return RX_DROP_MONITOR;
 728
 729                         mgmt = (struct ieee80211_mgmt *)hdr;
 730                         category = mgmt->u.action.category;
 731                         if (category != WLAN_CATEGORY_MESH_ACTION &&
 732                             category != WLAN_CATEGORY_SELF_PROTECTED)
 733                                 return RX_DROP_MONITOR;
 734                         return RX_CONTINUE;
 735                 }
 736
 737                 if (ieee80211_is_probe_req(hdr->frame_control) ||
 738                     ieee80211_is_probe_resp(hdr->frame_control) ||
 739                     ieee80211_is_beacon(hdr->frame_control) ||
 740                     ieee80211_is_auth(hdr->frame_control))
 741                         return RX_CONTINUE;
 742
 743                 return RX_DROP_MONITOR;
 744         }
 745
 746         return RX_CONTINUE;
 747 }
 748
 749 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
 750                                             struct tid_ampdu_rx *tid_agg_rx,
 751                                             int index,
 752                                             struct sk_buff_head *frames)
 753 {
 754         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
 755         struct sk_buff *skb;
 756         struct ieee80211_rx_status *status;
 757
 758         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 759
 760         if (skb_queue_empty(skb_list))
 761                 goto no_frame;
 762
 763         if (!ieee80211_rx_reorder_ready(skb_list)) {
 764                 __skb_queue_purge(skb_list);
 765                 goto no_frame;
 766         }
 767
 768         /* release frames from the reorder ring buffer */
 769         tid_agg_rx->stored_mpdu_num--;
 770         while ((skb = __skb_dequeue(skb_list))) {
 771                 status = IEEE80211_SKB_RXCB(skb);
 772                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
 773                 __skb_queue_tail(frames, skb);
 774         }
 775
 776 no_frame:
 777         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 778 }
 779
 780 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
 781                                              struct tid_ampdu_rx *tid_agg_rx,
 782                                              u16 head_seq_num,
 783                                              struct sk_buff_head *frames)
 784 {
 785         int index;
 786
 787         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 788
 789         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
 790                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 791                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 792                                                 frames);
 793         }
 794 }
 795
 796 /*
 797  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
 798  * the skb was added to the buffer longer than this time ago, the earlier
 799  * frames that have not yet been received are assumed to be lost and the skb
 800  * can be released for processing. This may also release other skb's from the
 801  * reorder buffer if there are no additional gaps between the frames.
 802  *
 803  * Callers must hold tid_agg_rx->reorder_lock.
 804  */
 805 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
 806
 807 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
 808                                           struct tid_ampdu_rx *tid_agg_rx,
 809                                           struct sk_buff_head *frames)
 810 {
 811         int index, i, j;
 812
 813         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 814
 815         /* release the buffer until next missing frame */
 816         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 817         if (!ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index]) &&
 818             tid_agg_rx->stored_mpdu_num) {
 819                 /*
 820                  * No buffers ready to be released, but check whether any
 821                  * frames in the reorder buffer have timed out.
 822                  */
 823                 int skipped = 1;
 824                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
 825                      j = (j + 1) % tid_agg_rx->buf_size) {
 826                         if (!ieee80211_rx_reorder_ready(
 827                                         &tid_agg_rx->reorder_buf[j])) {
 828                                 skipped++;
 829                                 continue;
 830                         }
 831                         if (skipped &&
 832                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
 833                                         HT_RX_REORDER_BUF_TIMEOUT))
 834                                 goto set_release_timer;
 835
 836                         /* don't leave incomplete A-MSDUs around */
 837                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
 838                              i = (i + 1) % tid_agg_rx->buf_size)
 839                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
 840
 841                         ht_dbg_ratelimited(sdata,
 842                                            "release an RX reorder frame due to timeout on earlier frames\n");
 843                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
 844                                                         frames);
 845
 846                         /*
 847                          * Increment the head seq# also for the skipped slots.
 848                          */
 849                         tid_agg_rx->head_seq_num =
 850                                 (tid_agg_rx->head_seq_num +
 851                                  skipped) & IEEE80211_SN_MASK;
 852                         skipped = 0;
 853                 }
 854         } else while (ieee80211_rx_reorder_ready(
 855                                 &tid_agg_rx->reorder_buf[index])) {
 856                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 857                                                 frames);
 858                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 859         }
 860
 861         if (tid_agg_rx->stored_mpdu_num) {
 862                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 863
 864                 for (; j != (index - 1) % tid_agg_rx->buf_size;
 865                      j = (j + 1) % tid_agg_rx->buf_size) {
 866                         if (ieee80211_rx_reorder_ready(
 867                                         &tid_agg_rx->reorder_buf[j]))
 868                                 break;
 869                 }
 870
 871  set_release_timer:
 872
 873                 mod_timer(&tid_agg_rx->reorder_timer,
 874                           tid_agg_rx->reorder_time[j] + 1 +
 875                           HT_RX_REORDER_BUF_TIMEOUT);
 876         } else {
 877                 del_timer(&tid_agg_rx->reorder_timer);
 878         }
 879 }
 880
 881 /*
 882  * As this function belongs to the RX path it must be under
 883  * rcu_read_lock protection. It returns false if the frame
 884  * can be processed immediately, true if it was consumed.
 885  */
 886 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
 887                                              struct tid_ampdu_rx *tid_agg_rx,
 888                                              struct sk_buff *skb,
 889                                              struct sk_buff_head *frames)
 890 {
 891         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 892         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 893         u16 sc = le16_to_cpu(hdr->seq_ctrl);
 894         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
 895         u16 head_seq_num, buf_size;
 896         int index;
 897         bool ret = true;
 898
 899         spin_lock(&tid_agg_rx->reorder_lock);
 900
 901         /*
 902          * Offloaded BA sessions have no known starting sequence number so pick
 903          * one from first Rxed frame for this tid after BA was started.
 904          */
 905         if (unlikely(tid_agg_rx->auto_seq)) {
 906                 tid_agg_rx->auto_seq = false;
 907                 tid_agg_rx->ssn = mpdu_seq_num;
 908                 tid_agg_rx->head_seq_num = mpdu_seq_num;
 909         }
 910
 911         buf_size = tid_agg_rx->buf_size;
 912         head_seq_num = tid_agg_rx->head_seq_num;
 913
 914         /* frame with out of date sequence number */
 915         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
 916                 dev_kfree_skb(skb);
 917                 goto out;
 918         }
 919
 920         /*
 921          * If frame the sequence number exceeds our buffering window
 922          * size release some previous frames to make room for this one.
 923          */
 924         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
 925                 head_seq_num = ieee80211_sn_inc(
 926                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
 927                 /* release stored frames up to new head to stack */
 928                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
 929                                                  head_seq_num, frames);
 930         }
 931
 932         /* Now the new frame is always in the range of the reordering buffer */
 933
 934         index = mpdu_seq_num % tid_agg_rx->buf_size;
 935
 936         /* check if we already stored this frame */
 937         if (ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index])) {
 938                 dev_kfree_skb(skb);
 939                 goto out;
 940         }
 941
 942         /*
 943          * If the current MPDU is in the right order and nothing else
 944          * is stored we can process it directly, no need to buffer it.
 945          * If it is first but there's something stored, we may be able
 946          * to release frames after this one.
 947          */
 948         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
 949             tid_agg_rx->stored_mpdu_num == 0) {
 950                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
 951                         tid_agg_rx->head_seq_num =
 952                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 953                 ret = false;
 954                 goto out;
 955         }
 956
 957         /* put the frame in the reordering buffer */
 958         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
 959         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
 960                 tid_agg_rx->reorder_time[index] = jiffies;
 961                 tid_agg_rx->stored_mpdu_num++;
 962                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
 963         }
 964
 965  out:
 966         spin_unlock(&tid_agg_rx->reorder_lock);
 967         return ret;
 968 }
 969
 970 /*
 971  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
 972  * true if the MPDU was buffered, false if it should be processed.
 973  */
 974 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
 975                                        struct sk_buff_head *frames)
 976 {
 977         struct sk_buff *skb = rx->skb;
 978         struct ieee80211_local *local = rx->local;
 979         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 980         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 981         struct sta_info *sta = rx->sta;
 982         struct tid_ampdu_rx *tid_agg_rx;
 983         u16 sc;
 984         u8 tid, ack_policy;
 985
 986         if (!ieee80211_is_data_qos(hdr->frame_control) ||
 987             is_multicast_ether_addr(hdr->addr1))
 988                 goto dont_reorder;
 989
 990         /*
 991          * filter the QoS data rx stream according to
 992          * STA/TID and check if this STA/TID is on aggregation
 993          */
 994
 995         if (!sta)
 996                 goto dont_reorder;
 997
 998         ack_policy = *ieee80211_get_qos_ctl(hdr) &
 999                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1000         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1001
1002         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1003         if (!tid_agg_rx)
1004                 goto dont_reorder;
1005
1006         /* qos null data frames are excluded */
1007         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1008                 goto dont_reorder;
1009
1010         /* not part of a BA session */
1011         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1012             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1013                 goto dont_reorder;
1014
1015         /* not actually part of this BA session */
1016         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1017                 goto dont_reorder;
1018
1019         /* new, potentially un-ordered, ampdu frame - process it */
1020
1021         /* reset session timer */
1022         if (tid_agg_rx->timeout)
1023                 tid_agg_rx->last_rx = jiffies;
1024
1025         /* if this mpdu is fragmented - terminate rx aggregation session */
1026         sc = le16_to_cpu(hdr->seq_ctrl);
1027         if (sc & IEEE80211_SCTL_FRAG) {
1028                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
1029                 skb_queue_tail(&rx->sdata->skb_queue, skb);
1030                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1031                 return;
1032         }
1033
1034         /*
1035          * No locking needed -- we will only ever process one
1036          * RX packet at a time, and thus own tid_agg_rx. All
1037          * other code manipulating it needs to (and does) make
1038          * sure that we cannot get to it any more before doing
1039          * anything with it.
1040          */
1041         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1042                                              frames))
1043                 return;
1044
1045  dont_reorder:
1046         __skb_queue_tail(frames, skb);
1047 }
1048
1049 static ieee80211_rx_result debug_noinline
1050 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1051 {
1052         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1053         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1054
1055         /*
1056          * Drop duplicate 802.11 retransmissions
1057          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1058          */
1059         if (rx->skb->len >= 24 && rx->sta &&
1060             !ieee80211_is_ctl(hdr->frame_control) &&
1061             !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1062             !is_multicast_ether_addr(hdr->addr1)) {
1063                 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1064                              rx->sta->last_seq_ctrl[rx->seqno_idx] ==
1065                              hdr->seq_ctrl)) {
1066                         if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
1067                                 rx->local->dot11FrameDuplicateCount++;
1068                                 rx->sta->num_duplicates++;
1069                         }
1070                         return RX_DROP_UNUSABLE;
1071                 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1072                         rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1073                 }
1074         }
1075
1076         if (unlikely(rx->skb->len < 16)) {
1077                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
1078                 return RX_DROP_MONITOR;
1079         }
1080
1081         /* Drop disallowed frame classes based on STA auth/assoc state;
1082          * IEEE 802.11, Chap 5.5.
1083          *
1084          * mac80211 filters only based on association state, i.e. it drops
1085          * Class 3 frames from not associated stations. hostapd sends
1086          * deauth/disassoc frames when needed. In addition, hostapd is
1087          * responsible for filtering on both auth and assoc states.
1088          */
1089
1090         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1091                 return ieee80211_rx_mesh_check(rx);
1092
1093         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1094                       ieee80211_is_pspoll(hdr->frame_control)) &&
1095                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1096                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1097                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1098                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1099                 /*
1100                  * accept port control frames from the AP even when it's not
1101                  * yet marked ASSOC to prevent a race where we don't set the
1102                  * assoc bit quickly enough before it sends the first frame
1103                  */
1104                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1105                     ieee80211_is_data_present(hdr->frame_control)) {
1106                         unsigned int hdrlen;
1107                         __be16 ethertype;
1108
1109                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1110
1111                         if (rx->skb->len < hdrlen + 8)
1112                                 return RX_DROP_MONITOR;
1113
1114                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1115                         if (ethertype == rx->sdata->control_port_protocol)
1116                                 return RX_CONTINUE;
1117                 }
1118
1119                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1120                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1121                                                hdr->addr2,
1122                                                GFP_ATOMIC))
1123                         return RX_DROP_UNUSABLE;
1124
1125                 return RX_DROP_MONITOR;
1126         }
1127
1128         return RX_CONTINUE;
1129 }
1130
1131
1132 static ieee80211_rx_result debug_noinline
1133 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1134 {
1135         struct ieee80211_local *local;
1136         struct ieee80211_hdr *hdr;
1137         struct sk_buff *skb;
1138
1139         local = rx->local;
1140         skb = rx->skb;
1141         hdr = (struct ieee80211_hdr *) skb->data;
1142
1143         if (!local->pspolling)
1144                 return RX_CONTINUE;
1145
1146         if (!ieee80211_has_fromds(hdr->frame_control))
1147                 /* this is not from AP */
1148                 return RX_CONTINUE;
1149
1150         if (!ieee80211_is_data(hdr->frame_control))
1151                 return RX_CONTINUE;
1152
1153         if (!ieee80211_has_moredata(hdr->frame_control)) {
1154                 /* AP has no more frames buffered for us */
1155                 local->pspolling = false;
1156                 return RX_CONTINUE;
1157         }
1158
1159         /* more data bit is set, let's request a new frame from the AP */
1160         ieee80211_send_pspoll(local, rx->sdata);
1161
1162         return RX_CONTINUE;
1163 }
1164
1165 static void sta_ps_start(struct sta_info *sta)
1166 {
1167         struct ieee80211_sub_if_data *sdata = sta->sdata;
1168         struct ieee80211_local *local = sdata->local;
1169         struct ps_data *ps;
1170
1171         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1172             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1173                 ps = &sdata->bss->ps;
1174         else
1175                 return;
1176
1177         atomic_inc(&ps->num_sta_ps);
1178         set_sta_flag(sta, WLAN_STA_PS_STA);
1179         if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1180                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1181         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1182                sta->sta.addr, sta->sta.aid);
1183 }
1184
1185 static void sta_ps_end(struct sta_info *sta)
1186 {
1187         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1188                sta->sta.addr, sta->sta.aid);
1189
1190         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1191                 /*
1192                  * Clear the flag only if the other one is still set
1193                  * so that the TX path won't start TX'ing new frames
1194                  * directly ... In the case that the driver flag isn't
1195                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1196                  */
1197                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1198                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1199                        sta->sta.addr, sta->sta.aid);
1200                 return;
1201         }
1202
1203         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1204         clear_sta_flag(sta, WLAN_STA_PS_STA);
1205         ieee80211_sta_ps_deliver_wakeup(sta);
1206 }
1207
1208 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1209 {
1210         struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1211         bool in_ps;
1212
1213         WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1214
1215         /* Don't let the same PS state be set twice */
1216         in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1217         if ((start && in_ps) || (!start && !in_ps))
1218                 return -EINVAL;
1219
1220         if (start)
1221                 sta_ps_start(sta_inf);
1222         else
1223                 sta_ps_end(sta_inf);
1224
1225         return 0;
1226 }
1227 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1228
1229 static ieee80211_rx_result debug_noinline
1230 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1231 {
1232         struct ieee80211_sub_if_data *sdata = rx->sdata;
1233         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1234         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1235         int tid, ac;
1236
1237         if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1238                 return RX_CONTINUE;
1239
1240         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1241             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1242                 return RX_CONTINUE;
1243
1244         /*
1245          * The device handles station powersave, so don't do anything about
1246          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1247          * it to mac80211 since they're handled.)
1248          */
1249         if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1250                 return RX_CONTINUE;
1251
1252         /*
1253          * Don't do anything if the station isn't already asleep. In
1254          * the uAPSD case, the station will probably be marked asleep,
1255          * in the PS-Poll case the station must be confused ...
1256          */
1257         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1258                 return RX_CONTINUE;
1259
1260         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1261                 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1262                         if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1263                                 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1264                         else
1265                                 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1266                 }
1267
1268                 /* Free PS Poll skb here instead of returning RX_DROP that would
1269                  * count as an dropped frame. */
1270                 dev_kfree_skb(rx->skb);
1271
1272                 return RX_QUEUED;
1273         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1274                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1275                    ieee80211_has_pm(hdr->frame_control) &&
1276                    (ieee80211_is_data_qos(hdr->frame_control) ||
1277                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1278                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1279                 ac = ieee802_1d_to_ac[tid & 7];
1280
1281                 /*
1282                  * If this AC is not trigger-enabled do nothing.
1283                  *
1284                  * NB: This could/should check a separate bitmap of trigger-
1285                  * enabled queues, but for now we only implement uAPSD w/o
1286                  * TSPEC changes to the ACs, so they're always the same.
1287                  */
1288                 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1289                         return RX_CONTINUE;
1290
1291                 /* if we are in a service period, do nothing */
1292                 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1293                         return RX_CONTINUE;
1294
1295                 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1296                         ieee80211_sta_ps_deliver_uapsd(rx->sta);
1297                 else
1298                         set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1299         }
1300
1301         return RX_CONTINUE;
1302 }
1303
1304 static ieee80211_rx_result debug_noinline
1305 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1306 {
1307         struct sta_info *sta = rx->sta;
1308         struct sk_buff *skb = rx->skb;
1309         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1310         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1311         int i;
1312
1313         if (!sta)
1314                 return RX_CONTINUE;
1315
1316         /*
1317          * Update last_rx only for IBSS packets which are for the current
1318          * BSSID and for station already AUTHORIZED to avoid keeping the
1319          * current IBSS network alive in cases where other STAs start
1320          * using different BSSID. This will also give the station another
1321          * chance to restart the authentication/authorization in case
1322          * something went wrong the first time.
1323          */
1324         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1325                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1326                                                 NL80211_IFTYPE_ADHOC);
1327                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1328                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1329                         sta->last_rx = jiffies;
1330                         if (ieee80211_is_data(hdr->frame_control) &&
1331                             !is_multicast_ether_addr(hdr->addr1)) {
1332                                 sta->last_rx_rate_idx = status->rate_idx;
1333                                 sta->last_rx_rate_flag = status->flag;
1334                                 sta->last_rx_rate_vht_flag = status->vht_flag;
1335                                 sta->last_rx_rate_vht_nss = status->vht_nss;
1336                         }
1337                 }
1338         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1339                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1340                                                 NL80211_IFTYPE_OCB);
1341                 /* OCB uses wild-card BSSID */
1342                 if (is_broadcast_ether_addr(bssid))
1343                         sta->last_rx = jiffies;
1344         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1345                 /*
1346                  * Mesh beacons will update last_rx when if they are found to
1347                  * match the current local configuration when processed.
1348                  */
1349                 sta->last_rx = jiffies;
1350                 if (ieee80211_is_data(hdr->frame_control)) {
1351                         sta->last_rx_rate_idx = status->rate_idx;
1352                         sta->last_rx_rate_flag = status->flag;
1353                         sta->last_rx_rate_vht_flag = status->vht_flag;
1354                         sta->last_rx_rate_vht_nss = status->vht_nss;
1355                 }
1356         }
1357
1358         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1359                 return RX_CONTINUE;
1360
1361         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1362                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1363
1364         sta->rx_fragments++;
1365         sta->rx_bytes += rx->skb->len;
1366         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1367                 sta->last_signal = status->signal;
1368                 ewma_add(&sta->avg_signal, -status->signal);
1369         }
1370
1371         if (status->chains) {
1372                 sta->chains = status->chains;
1373                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1374                         int signal = status->chain_signal[i];
1375
1376                         if (!(status->chains & BIT(i)))
1377                                 continue;
1378
1379                         sta->chain_signal_last[i] = signal;
1380                         ewma_add(&sta->chain_signal_avg[i], -signal);
1381                 }
1382         }
1383
1384         /*
1385          * Change STA power saving mode only at the end of a frame
1386          * exchange sequence.
1387          */
1388         if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1389             !ieee80211_has_morefrags(hdr->frame_control) &&
1390             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1391             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1392              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1393             /* PM bit is only checked in frames where it isn't reserved,
1394              * in AP mode it's reserved in non-bufferable management frames
1395              * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1396              */
1397             (!ieee80211_is_mgmt(hdr->frame_control) ||
1398              ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1399                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1400                         if (!ieee80211_has_pm(hdr->frame_control))
1401                                 sta_ps_end(sta);
1402                 } else {
1403                         if (ieee80211_has_pm(hdr->frame_control))
1404                                 sta_ps_start(sta);
1405                 }
1406         }
1407
1408         /* mesh power save support */
1409         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1410                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1411
1412         /*
1413          * Drop (qos-)data::nullfunc frames silently, since they
1414          * are used only to control station power saving mode.
1415          */
1416         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1417             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1418                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1419
1420                 /*
1421                  * If we receive a 4-addr nullfunc frame from a STA
1422                  * that was not moved to a 4-addr STA vlan yet send
1423                  * the event to userspace and for older hostapd drop
1424                  * the frame to the monitor interface.
1425                  */
1426                 if (ieee80211_has_a4(hdr->frame_control) &&
1427                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1428                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1429                       !rx->sdata->u.vlan.sta))) {
1430                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1431                                 cfg80211_rx_unexpected_4addr_frame(
1432                                         rx->sdata->dev, sta->sta.addr,
1433                                         GFP_ATOMIC);
1434                         return RX_DROP_MONITOR;
1435                 }
1436                 /*
1437                  * Update counter and free packet here to avoid
1438                  * counting this as a dropped packed.
1439                  */
1440                 sta->rx_packets++;
1441                 dev_kfree_skb(rx->skb);
1442                 return RX_QUEUED;
1443         }
1444
1445         return RX_CONTINUE;
1446 } /* ieee80211_rx_h_sta_process */
1447
1448 static ieee80211_rx_result debug_noinline
1449 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1450 {
1451         struct sk_buff *skb = rx->skb;
1452         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1453         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1454         int keyidx;
1455         int hdrlen;
1456         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1457         struct ieee80211_key *sta_ptk = NULL;
1458         int mmie_keyidx = -1;
1459         __le16 fc;
1460         const struct ieee80211_cipher_scheme *cs = NULL;
1461
1462         /*
1463          * Key selection 101
1464          *
1465          * There are four types of keys:
1466          *  - GTK (group keys)
1467          *  - IGTK (group keys for management frames)
1468          *  - PTK (pairwise keys)
1469          *  - STK (station-to-station pairwise keys)
1470          *
1471          * When selecting a key, we have to distinguish between multicast
1472          * (including broadcast) and unicast frames, the latter can only
1473          * use PTKs and STKs while the former always use GTKs and IGTKs.
1474          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1475          * unicast frames can also use key indices like GTKs. Hence, if we
1476          * don't have a PTK/STK we check the key index for a WEP key.
1477          *
1478          * Note that in a regular BSS, multicast frames are sent by the
1479          * AP only, associated stations unicast the frame to the AP first
1480          * which then multicasts it on their behalf.
1481          *
1482          * There is also a slight problem in IBSS mode: GTKs are negotiated
1483          * with each station, that is something we don't currently handle.
1484          * The spec seems to expect that one negotiates the same key with
1485          * every station but there's no such requirement; VLANs could be
1486          * possible.
1487          */
1488
1489         /*
1490          * No point in finding a key and decrypting if the frame is neither
1491          * addressed to us nor a multicast frame.
1492          */
1493         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1494                 return RX_CONTINUE;
1495
1496         /* start without a key */
1497         rx->key = NULL;
1498         fc = hdr->frame_control;
1499
1500         if (rx->sta) {
1501                 int keyid = rx->sta->ptk_idx;
1502
1503                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1504                         cs = rx->sta->cipher_scheme;
1505                         keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1506                         if (unlikely(keyid < 0))
1507                                 return RX_DROP_UNUSABLE;
1508                 }
1509                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1510         }
1511
1512         if (!ieee80211_has_protected(fc))
1513                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1514
1515         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1516                 rx->key = sta_ptk;
1517                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1518                     (status->flag & RX_FLAG_IV_STRIPPED))
1519                         return RX_CONTINUE;
1520                 /* Skip decryption if the frame is not protected. */
1521                 if (!ieee80211_has_protected(fc))
1522                         return RX_CONTINUE;
1523         } else if (mmie_keyidx >= 0) {
1524                 /* Broadcast/multicast robust management frame / BIP */
1525                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1526                     (status->flag & RX_FLAG_IV_STRIPPED))
1527                         return RX_CONTINUE;
1528
1529                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1530                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1531                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1532                 if (rx->sta)
1533                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1534                 if (!rx->key)
1535                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1536         } else if (!ieee80211_has_protected(fc)) {
1537                 /*
1538                  * The frame was not protected, so skip decryption. However, we
1539                  * need to set rx->key if there is a key that could have been
1540                  * used so that the frame may be dropped if encryption would
1541                  * have been expected.
1542                  */
1543                 struct ieee80211_key *key = NULL;
1544                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1545                 int i;
1546
1547                 if (ieee80211_is_mgmt(fc) &&
1548                     is_multicast_ether_addr(hdr->addr1) &&
1549                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1550                         rx->key = key;
1551                 else {
1552                         if (rx->sta) {
1553                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1554                                         key = rcu_dereference(rx->sta->gtk[i]);
1555                                         if (key)
1556                                                 break;
1557                                 }
1558                         }
1559                         if (!key) {
1560                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1561                                         key = rcu_dereference(sdata->keys[i]);
1562                                         if (key)
1563                                                 break;
1564                                 }
1565                         }
1566                         if (key)
1567                                 rx->key = key;
1568                 }
1569                 return RX_CONTINUE;
1570         } else {
1571                 u8 keyid;
1572
1573                 /*
1574                  * The device doesn't give us the IV so we won't be
1575                  * able to look up the key. That's ok though, we
1576                  * don't need to decrypt the frame, we just won't
1577                  * be able to keep statistics accurate.
1578                  * Except for key threshold notifications, should
1579                  * we somehow allow the driver to tell us which key
1580                  * the hardware used if this flag is set?
1581                  */
1582                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1583                     (status->flag & RX_FLAG_IV_STRIPPED))
1584                         return RX_CONTINUE;
1585
1586                 hdrlen = ieee80211_hdrlen(fc);
1587
1588                 if (cs) {
1589                         keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
1590
1591                         if (unlikely(keyidx < 0))
1592                                 return RX_DROP_UNUSABLE;
1593                 } else {
1594                         if (rx->skb->len < 8 + hdrlen)
1595                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1596                         /*
1597                          * no need to call ieee80211_wep_get_keyidx,
1598                          * it verifies a bunch of things we've done already
1599                          */
1600                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1601                         keyidx = keyid >> 6;
1602                 }
1603
1604                 /* check per-station GTK first, if multicast packet */
1605                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1606                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1607
1608                 /* if not found, try default key */
1609                 if (!rx->key) {
1610                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1611
1612                         /*
1613                          * RSNA-protected unicast frames should always be
1614                          * sent with pairwise or station-to-station keys,
1615                          * but for WEP we allow using a key index as well.
1616                          */
1617                         if (rx->key &&
1618                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1619                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1620                             !is_multicast_ether_addr(hdr->addr1))
1621                                 rx->key = NULL;
1622                 }
1623         }
1624
1625         if (rx->key) {
1626                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1627                         return RX_DROP_MONITOR;
1628
1629                 rx->key->tx_rx_count++;
1630                 /* TODO: add threshold stuff again */
1631         } else {
1632                 return RX_DROP_MONITOR;
1633         }
1634
1635         switch (rx->key->conf.cipher) {
1636         case WLAN_CIPHER_SUITE_WEP40:
1637         case WLAN_CIPHER_SUITE_WEP104:
1638                 result = ieee80211_crypto_wep_decrypt(rx);
1639                 break;
1640         case WLAN_CIPHER_SUITE_TKIP:
1641                 result = ieee80211_crypto_tkip_decrypt(rx);
1642                 break;
1643         case WLAN_CIPHER_SUITE_CCMP:
1644                 result = ieee80211_crypto_ccmp_decrypt(rx);
1645                 break;
1646         case WLAN_CIPHER_SUITE_AES_CMAC:
1647                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1648                 break;
1649         default:
1650                 result = ieee80211_crypto_hw_decrypt(rx);
1651         }
1652
1653         /* the hdr variable is invalid after the decrypt handlers */
1654
1655         /* either the frame has been decrypted or will be dropped */
1656         status->flag |= RX_FLAG_DECRYPTED;
1657
1658         return result;
1659 }
1660
1661 static inline struct ieee80211_fragment_entry *
1662 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1663                          unsigned int frag, unsigned int seq, int rx_queue,
1664                          struct sk_buff **skb)
1665 {
1666         struct ieee80211_fragment_entry *entry;
1667
1668         entry = &sdata->fragments[sdata->fragment_next++];
1669         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1670                 sdata->fragment_next = 0;
1671
1672         if (!skb_queue_empty(&entry->skb_list))
1673                 __skb_queue_purge(&entry->skb_list);
1674
1675         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1676         *skb = NULL;
1677         entry->first_frag_time = jiffies;
1678         entry->seq = seq;
1679         entry->rx_queue = rx_queue;
1680         entry->last_frag = frag;
1681         entry->ccmp = 0;
1682         entry->extra_len = 0;
1683
1684         return entry;
1685 }
1686
1687 static inline struct ieee80211_fragment_entry *
1688 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1689                           unsigned int frag, unsigned int seq,
1690                           int rx_queue, struct ieee80211_hdr *hdr)
1691 {
1692         struct ieee80211_fragment_entry *entry;
1693         int i, idx;
1694
1695         idx = sdata->fragment_next;
1696         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1697                 struct ieee80211_hdr *f_hdr;
1698
1699                 idx--;
1700                 if (idx < 0)
1701                         idx = IEEE80211_FRAGMENT_MAX - 1;
1702
1703                 entry = &sdata->fragments[idx];
1704                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1705                     entry->rx_queue != rx_queue ||
1706                     entry->last_frag + 1 != frag)
1707                         continue;
1708
1709                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1710
1711                 /*
1712                  * Check ftype and addresses are equal, else check next fragment
1713                  */
1714                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1715                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1716                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1717                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1718                         continue;
1719
1720                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1721                         __skb_queue_purge(&entry->skb_list);
1722                         continue;
1723                 }
1724                 return entry;
1725         }
1726
1727         return NULL;
1728 }
1729
1730 static ieee80211_rx_result debug_noinline
1731 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1732 {
1733         struct ieee80211_hdr *hdr;
1734         u16 sc;
1735         __le16 fc;
1736         unsigned int frag, seq;
1737         struct ieee80211_fragment_entry *entry;
1738         struct sk_buff *skb;
1739         struct ieee80211_rx_status *status;
1740
1741         hdr = (struct ieee80211_hdr *)rx->skb->data;
1742         fc = hdr->frame_control;
1743
1744         if (ieee80211_is_ctl(fc))
1745                 return RX_CONTINUE;
1746
1747         sc = le16_to_cpu(hdr->seq_ctrl);
1748         frag = sc & IEEE80211_SCTL_FRAG;
1749
1750         if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1751                    is_multicast_ether_addr(hdr->addr1))) {
1752                 /* not fragmented */
1753                 goto out;
1754         }
1755         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1756
1757         if (skb_linearize(rx->skb))
1758                 return RX_DROP_UNUSABLE;
1759
1760         /*
1761          *  skb_linearize() might change the skb->data and
1762          *  previously cached variables (in this case, hdr) need to
1763          *  be refreshed with the new data.
1764          */
1765         hdr = (struct ieee80211_hdr *)rx->skb->data;
1766         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1767
1768         if (frag == 0) {
1769                 /* This is the first fragment of a new frame. */
1770                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1771                                                  rx->seqno_idx, &(rx->skb));
1772                 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1773                     ieee80211_has_protected(fc)) {
1774                         int queue = rx->security_idx;
1775                         /* Store CCMP PN so that we can verify that the next
1776                          * fragment has a sequential PN value. */
1777                         entry->ccmp = 1;
1778                         memcpy(entry->last_pn,
1779                                rx->key->u.ccmp.rx_pn[queue],
1780                                IEEE80211_CCMP_PN_LEN);
1781                 }
1782                 return RX_QUEUED;
1783         }
1784
1785         /* This is a fragment for a frame that should already be pending in
1786          * fragment cache. Add this fragment to the end of the pending entry.
1787          */
1788         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1789                                           rx->seqno_idx, hdr);
1790         if (!entry) {
1791                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1792                 return RX_DROP_MONITOR;
1793         }
1794
1795         /* Verify that MPDUs within one MSDU have sequential PN values.
1796          * (IEEE 802.11i, 8.3.3.4.5) */
1797         if (entry->ccmp) {
1798                 int i;
1799                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1800                 int queue;
1801                 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1802                         return RX_DROP_UNUSABLE;
1803                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1804                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1805                         pn[i]++;
1806                         if (pn[i])
1807                                 break;
1808                 }
1809                 queue = rx->security_idx;
1810                 rpn = rx->key->u.ccmp.rx_pn[queue];
1811                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1812                         return RX_DROP_UNUSABLE;
1813                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1814         }
1815
1816         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1817         __skb_queue_tail(&entry->skb_list, rx->skb);
1818         entry->last_frag = frag;
1819         entry->extra_len += rx->skb->len;
1820         if (ieee80211_has_morefrags(fc)) {
1821                 rx->skb = NULL;
1822                 return RX_QUEUED;
1823         }
1824
1825         rx->skb = __skb_dequeue(&entry->skb_list);
1826         if (skb_tailroom(rx->skb) < entry->extra_len) {
1827                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1828                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1829                                               GFP_ATOMIC))) {
1830                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1831                         __skb_queue_purge(&entry->skb_list);
1832                         return RX_DROP_UNUSABLE;
1833                 }
1834         }
1835         while ((skb = __skb_dequeue(&entry->skb_list))) {
1836                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1837                 dev_kfree_skb(skb);
1838         }
1839
1840         /* Complete frame has been reassembled - process it now */
1841         status = IEEE80211_SKB_RXCB(rx->skb);
1842         status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1843
1844  out:
1845         if (rx->sta)
1846                 rx->sta->rx_packets++;
1847         if (is_multicast_ether_addr(hdr->addr1))
1848                 rx->local->dot11MulticastReceivedFrameCount++;
1849         else
1850                 ieee80211_led_rx(rx->local);
1851         return RX_CONTINUE;
1852 }
1853
1854 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1855 {
1856         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1857                 return -EACCES;
1858
1859         return 0;
1860 }
1861
1862 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1863 {
1864         struct sk_buff *skb = rx->skb;
1865         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1866
1867         /*
1868          * Pass through unencrypted frames if the hardware has
1869          * decrypted them already.
1870          */
1871         if (status->flag & RX_FLAG_DECRYPTED)
1872                 return 0;
1873
1874         /* Drop unencrypted frames if key is set. */
1875         if (unlikely(!ieee80211_has_protected(fc) &&
1876                      !ieee80211_is_nullfunc(fc) &&
1877                      ieee80211_is_data(fc) &&
1878                      (rx->key || rx->sdata->drop_unencrypted)))
1879                 return -EACCES;
1880
1881         return 0;
1882 }
1883
1884 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1885 {
1886         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1887         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1888         __le16 fc = hdr->frame_control;
1889
1890         /*
1891          * Pass through unencrypted frames if the hardware has
1892          * decrypted them already.
1893          */
1894         if (status->flag & RX_FLAG_DECRYPTED)
1895                 return 0;
1896
1897         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1898                 if (unlikely(!ieee80211_has_protected(fc) &&
1899                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1900                              rx->key)) {
1901                         if (ieee80211_is_deauth(fc) ||
1902                             ieee80211_is_disassoc(fc))
1903                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1904                                                              rx->skb->data,
1905                                                              rx->skb->len);
1906                         return -EACCES;
1907                 }
1908                 /* BIP does not use Protected field, so need to check MMIE */
1909                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1910                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1911                         if (ieee80211_is_deauth(fc) ||
1912                             ieee80211_is_disassoc(fc))
1913                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1914                                                              rx->skb->data,
1915                                                              rx->skb->len);
1916                         return -EACCES;
1917                 }
1918                 /*
1919                  * When using MFP, Action frames are not allowed prior to
1920                  * having configured keys.
1921                  */
1922                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1923                              ieee80211_is_robust_mgmt_frame(rx->skb)))
1924                         return -EACCES;
1925         }
1926
1927         return 0;
1928 }
1929
1930 static int
1931 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1932 {
1933         struct ieee80211_sub_if_data *sdata = rx->sdata;
1934         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1935         bool check_port_control = false;
1936         struct ethhdr *ehdr;
1937         int ret;
1938
1939         *port_control = false;
1940         if (ieee80211_has_a4(hdr->frame_control) &&
1941             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1942                 return -1;
1943
1944         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1945             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1946
1947                 if (!sdata->u.mgd.use_4addr)
1948                         return -1;
1949                 else
1950                         check_port_control = true;
1951         }
1952
1953         if (is_multicast_ether_addr(hdr->addr1) &&
1954             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1955                 return -1;
1956
1957         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1958         if (ret < 0)
1959                 return ret;
1960
1961         ehdr = (struct ethhdr *) rx->skb->data;
1962         if (ehdr->h_proto == rx->sdata->control_port_protocol)
1963                 *port_control = true;
1964         else if (check_port_control)
1965                 return -1;
1966
1967         return 0;
1968 }
1969
1970 /*
1971  * requires that rx->skb is a frame with ethernet header
1972  */
1973 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1974 {
1975         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1976                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1977         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1978
1979         /*
1980          * Allow EAPOL frames to us/the PAE group address regardless
1981          * of whether the frame was encrypted or not.
1982          */
1983         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1984             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1985              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
1986                 return true;
1987
1988         if (ieee80211_802_1x_port_control(rx) ||
1989             ieee80211_drop_unencrypted(rx, fc))
1990                 return false;
1991
1992         return true;
1993 }
1994
1995 /*
1996  * requires that rx->skb is a frame with ethernet header
1997  */
1998 static void
1999 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2000 {
2001         struct ieee80211_sub_if_data *sdata = rx->sdata;
2002         struct net_device *dev = sdata->dev;
2003         struct sk_buff *skb, *xmit_skb;
2004         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2005         struct sta_info *dsta;
2006         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2007
2008         skb = rx->skb;
2009         xmit_skb = NULL;
2010
2011         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2012              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2013             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2014             (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
2015             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2016                 if (is_multicast_ether_addr(ehdr->h_dest)) {
2017                         /*
2018                          * send multicast frames both to higher layers in
2019                          * local net stack and back to the wireless medium
2020                          */
2021                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2022                         if (!xmit_skb)
2023                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2024                                                     dev->name);
2025                 } else {
2026                         dsta = sta_info_get(sdata, skb->data);
2027                         if (dsta) {
2028                                 /*
2029                                  * The destination station is associated to
2030                                  * this AP (in this VLAN), so send the frame
2031                                  * directly to it and do not pass it to local
2032                                  * net stack.
2033                                  */
2034                                 xmit_skb = skb;
2035                                 skb = NULL;
2036                         }
2037                 }
2038         }
2039
2040 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2041         if (skb) {
2042                 /* 'align' will only take the values 0 or 2 here since all
2043                  * frames are required to be aligned to 2-byte boundaries
2044                  * when being passed to mac80211; the code here works just
2045                  * as well if that isn't true, but mac80211 assumes it can
2046                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2047                  */
2048                 int align;
2049
2050                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2051                 if (align) {
2052                         if (WARN_ON(skb_headroom(skb) < 3)) {
2053                                 dev_kfree_skb(skb);
2054                                 skb = NULL;
2055                         } else {
2056                                 u8 *data = skb->data;
2057                                 size_t len = skb_headlen(skb);
2058                                 skb->data -= align;
2059                                 memmove(skb->data, data, len);
2060                                 skb_set_tail_pointer(skb, len);
2061                         }
2062                 }
2063         }
2064 #endif
2065
2066         if (skb) {
2067                 /* deliver to local stack */
2068                 skb->protocol = eth_type_trans(skb, dev);
2069                 memset(skb->cb, 0, sizeof(skb->cb));
2070                 if (rx->local->napi)
2071                         napi_gro_receive(rx->local->napi, skb);
2072                 else
2073                         netif_receive_skb(skb);
2074         }
2075
2076         if (xmit_skb) {
2077                 /*
2078                  * Send to wireless media and increase priority by 256 to
2079                  * keep the received priority instead of reclassifying
2080                  * the frame (see cfg80211_classify8021d).
2081                  */
2082                 xmit_skb->priority += 256;
2083                 xmit_skb->protocol = htons(ETH_P_802_3);
2084                 skb_reset_network_header(xmit_skb);
2085                 skb_reset_mac_header(xmit_skb);
2086                 dev_queue_xmit(xmit_skb);
2087         }
2088 }
2089
2090 static ieee80211_rx_result debug_noinline
2091 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2092 {
2093         struct net_device *dev = rx->sdata->dev;
2094         struct sk_buff *skb = rx->skb;
2095         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2096         __le16 fc = hdr->frame_control;
2097         struct sk_buff_head frame_list;
2098         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2099
2100         if (unlikely(!ieee80211_is_data(fc)))
2101                 return RX_CONTINUE;
2102
2103         if (unlikely(!ieee80211_is_data_present(fc)))
2104                 return RX_DROP_MONITOR;
2105
2106         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2107                 return RX_CONTINUE;
2108
2109         if (ieee80211_has_a4(hdr->frame_control) &&
2110             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2111             !rx->sdata->u.vlan.sta)
2112                 return RX_DROP_UNUSABLE;
2113
2114         if (is_multicast_ether_addr(hdr->addr1) &&
2115             ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2116               rx->sdata->u.vlan.sta) ||
2117              (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2118               rx->sdata->u.mgd.use_4addr)))
2119                 return RX_DROP_UNUSABLE;
2120
2121         skb->dev = dev;
2122         __skb_queue_head_init(&frame_list);
2123
2124         if (skb_linearize(skb))
2125                 return RX_DROP_UNUSABLE;
2126
2127         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2128                                  rx->sdata->vif.type,
2129                                  rx->local->hw.extra_tx_headroom, true);
2130
2131         while (!skb_queue_empty(&frame_list)) {
2132                 rx->skb = __skb_dequeue(&frame_list);
2133
2134                 if (!ieee80211_frame_allowed(rx, fc)) {
2135                         dev_kfree_skb(rx->skb);
2136                         continue;
2137                 }
2138                 dev->stats.rx_packets++;
2139                 dev->stats.rx_bytes += rx->skb->len;
2140
2141                 ieee80211_deliver_skb(rx);
2142         }
2143
2144         return RX_QUEUED;
2145 }
2146
2147 #ifdef CONFIG_MAC80211_MESH
2148 static ieee80211_rx_result
2149 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2150 {
2151         struct ieee80211_hdr *fwd_hdr, *hdr;
2152         struct ieee80211_tx_info *info;
2153         struct ieee80211s_hdr *mesh_hdr;
2154         struct sk_buff *skb = rx->skb, *fwd_skb;
2155         struct ieee80211_local *local = rx->local;
2156         struct ieee80211_sub_if_data *sdata = rx->sdata;
2157         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2158         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2159         u16 q, hdrlen;
2160
2161         hdr = (struct ieee80211_hdr *) skb->data;
2162         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2163
2164         /* make sure fixed part of mesh header is there, also checks skb len */
2165         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2166                 return RX_DROP_MONITOR;
2167
2168         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2169
2170         /* make sure full mesh header is there, also checks skb len */
2171         if (!pskb_may_pull(rx->skb,
2172                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2173                 return RX_DROP_MONITOR;
2174
2175         /* reload pointers */
2176         hdr = (struct ieee80211_hdr *) skb->data;
2177         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2178
2179         /* frame is in RMC, don't forward */
2180         if (ieee80211_is_data(hdr->frame_control) &&
2181             is_multicast_ether_addr(hdr->addr1) &&
2182             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2183                 return RX_DROP_MONITOR;
2184
2185         if (!ieee80211_is_data(hdr->frame_control) ||
2186             !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2187                 return RX_CONTINUE;
2188
2189         if (!mesh_hdr->ttl)
2190                 return RX_DROP_MONITOR;
2191
2192         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2193                 struct mesh_path *mppath;
2194                 char *proxied_addr;
2195                 char *mpp_addr;
2196
2197                 if (is_multicast_ether_addr(hdr->addr1)) {
2198                         mpp_addr = hdr->addr3;
2199                         proxied_addr = mesh_hdr->eaddr1;
2200                 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2201                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2202                         mpp_addr = hdr->addr4;
2203                         proxied_addr = mesh_hdr->eaddr2;
2204                 } else {
2205                         return RX_DROP_MONITOR;
2206                 }
2207
2208                 rcu_read_lock();
2209                 mppath = mpp_path_lookup(sdata, proxied_addr);
2210                 if (!mppath) {
2211                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2212                 } else {
2213                         spin_lock_bh(&mppath->state_lock);
2214                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2215                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2216                         spin_unlock_bh(&mppath->state_lock);
2217                 }
2218                 rcu_read_unlock();
2219         }
2220
2221         /* Frame has reached destination.  Don't forward */
2222         if (!is_multicast_ether_addr(hdr->addr1) &&
2223             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2224                 return RX_CONTINUE;
2225
2226         q = ieee80211_select_queue_80211(sdata, skb, hdr);
2227         if (ieee80211_queue_stopped(&local->hw, q)) {
2228                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2229                 return RX_DROP_MONITOR;
2230         }
2231         skb_set_queue_mapping(skb, q);
2232
2233         if (!--mesh_hdr->ttl) {
2234                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2235                 goto out;
2236         }
2237
2238         if (!ifmsh->mshcfg.dot11MeshForwarding)
2239                 goto out;
2240
2241         fwd_skb = skb_copy(skb, GFP_ATOMIC);
2242         if (!fwd_skb) {
2243                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2244                                     sdata->name);
2245                 goto out;
2246         }
2247
2248         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2249         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2250         info = IEEE80211_SKB_CB(fwd_skb);
2251         memset(info, 0, sizeof(*info));
2252         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2253         info->control.vif = &rx->sdata->vif;
2254         info->control.jiffies = jiffies;
2255         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2256                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2257                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2258                 /* update power mode indication when forwarding */
2259                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2260         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2261                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2262                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2263         } else {
2264                 /* unable to resolve next hop */
2265                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2266                                    fwd_hdr->addr3, 0,
2267                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2268                                    fwd_hdr->addr2);
2269                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2270                 kfree_skb(fwd_skb);
2271                 return RX_DROP_MONITOR;
2272         }
2273
2274         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2275         ieee80211_add_pending_skb(local, fwd_skb);
2276  out:
2277         if (is_multicast_ether_addr(hdr->addr1) ||
2278             sdata->dev->flags & IFF_PROMISC)
2279                 return RX_CONTINUE;
2280         else
2281                 return RX_DROP_MONITOR;
2282 }
2283 #endif
2284
2285 static ieee80211_rx_result debug_noinline
2286 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2287 {
2288         struct ieee80211_sub_if_data *sdata = rx->sdata;
2289         struct ieee80211_local *local = rx->local;
2290         struct net_device *dev = sdata->dev;
2291         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2292         __le16 fc = hdr->frame_control;
2293         bool port_control;
2294         int err;
2295
2296         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2297                 return RX_CONTINUE;
2298
2299         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2300                 return RX_DROP_MONITOR;
2301
2302         /*
2303          * Send unexpected-4addr-frame event to hostapd. For older versions,
2304          * also drop the frame to cooked monitor interfaces.
2305          */
2306         if (ieee80211_has_a4(hdr->frame_control) &&
2307             sdata->vif.type == NL80211_IFTYPE_AP) {
2308                 if (rx->sta &&
2309                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2310                         cfg80211_rx_unexpected_4addr_frame(
2311                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2312                 return RX_DROP_MONITOR;
2313         }
2314
2315         err = __ieee80211_data_to_8023(rx, &port_control);
2316         if (unlikely(err))
2317                 return RX_DROP_UNUSABLE;
2318
2319         if (!ieee80211_frame_allowed(rx, fc))
2320                 return RX_DROP_MONITOR;
2321
2322         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2323             unlikely(port_control) && sdata->bss) {
2324                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2325                                      u.ap);
2326                 dev = sdata->dev;
2327                 rx->sdata = sdata;
2328         }
2329
2330         rx->skb->dev = dev;
2331
2332         dev->stats.rx_packets++;
2333         dev->stats.rx_bytes += rx->skb->len;
2334
2335         if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2336             !is_multicast_ether_addr(
2337                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2338             (!local->scanning &&
2339              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2340                         mod_timer(&local->dynamic_ps_timer, jiffies +
2341                          msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2342         }
2343
2344         ieee80211_deliver_skb(rx);
2345
2346         return RX_QUEUED;
2347 }
2348
2349 static ieee80211_rx_result debug_noinline
2350 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2351 {
2352         struct sk_buff *skb = rx->skb;
2353         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2354         struct tid_ampdu_rx *tid_agg_rx;
2355         u16 start_seq_num;
2356         u16 tid;
2357
2358         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2359                 return RX_CONTINUE;
2360
2361         if (ieee80211_is_back_req(bar->frame_control)) {
2362                 struct {
2363                         __le16 control, start_seq_num;
2364                 } __packed bar_data;
2365
2366                 if (!rx->sta)
2367                         return RX_DROP_MONITOR;
2368
2369                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2370                                   &bar_data, sizeof(bar_data)))
2371                         return RX_DROP_MONITOR;
2372
2373                 tid = le16_to_cpu(bar_data.control) >> 12;
2374
2375                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2376                 if (!tid_agg_rx)
2377                         return RX_DROP_MONITOR;
2378
2379                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2380
2381                 /* reset session timer */
2382                 if (tid_agg_rx->timeout)
2383                         mod_timer(&tid_agg_rx->session_timer,
2384                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2385
2386                 spin_lock(&tid_agg_rx->reorder_lock);
2387                 /* release stored frames up to start of BAR */
2388                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2389                                                  start_seq_num, frames);
2390                 spin_unlock(&tid_agg_rx->reorder_lock);
2391
2392                 kfree_skb(skb);
2393                 return RX_QUEUED;
2394         }
2395
2396         /*
2397          * After this point, we only want management frames,
2398          * so we can drop all remaining control frames to
2399          * cooked monitor interfaces.
2400          */
2401         return RX_DROP_MONITOR;
2402 }
2403
2404 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2405                                            struct ieee80211_mgmt *mgmt,
2406                                            size_t len)
2407 {
2408         struct ieee80211_local *local = sdata->local;
2409         struct sk_buff *skb;
2410         struct ieee80211_mgmt *resp;
2411
2412         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2413                 /* Not to own unicast address */
2414                 return;
2415         }
2416
2417         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2418             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2419                 /* Not from the current AP or not associated yet. */
2420                 return;
2421         }
2422
2423         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2424                 /* Too short SA Query request frame */
2425                 return;
2426         }
2427
2428         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2429         if (skb == NULL)
2430                 return;
2431
2432         skb_reserve(skb, local->hw.extra_tx_headroom);
2433         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2434         memset(resp, 0, 24);
2435         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2436         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2437         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2438         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2439                                           IEEE80211_STYPE_ACTION);
2440         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2441         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2442         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2443         memcpy(resp->u.action.u.sa_query.trans_id,
2444                mgmt->u.action.u.sa_query.trans_id,
2445                WLAN_SA_QUERY_TR_ID_LEN);
2446
2447         ieee80211_tx_skb(sdata, skb);
2448 }
2449
2450 static ieee80211_rx_result debug_noinline
2451 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2452 {
2453         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2454         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2455
2456         /*
2457          * From here on, look only at management frames.
2458          * Data and control frames are already handled,
2459          * and unknown (reserved) frames are useless.
2460          */
2461         if (rx->skb->len < 24)
2462                 return RX_DROP_MONITOR;
2463
2464         if (!ieee80211_is_mgmt(mgmt->frame_control))
2465                 return RX_DROP_MONITOR;
2466
2467         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2468             ieee80211_is_beacon(mgmt->frame_control) &&
2469             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2470                 int sig = 0;
2471
2472                 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2473                         sig = status->signal;
2474
2475                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2476                                             rx->skb->data, rx->skb->len,
2477                                             status->freq, sig);
2478                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2479         }
2480
2481         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2482                 return RX_DROP_MONITOR;
2483
2484         if (ieee80211_drop_unencrypted_mgmt(rx))
2485                 return RX_DROP_UNUSABLE;
2486
2487         return RX_CONTINUE;
2488 }
2489
2490 static ieee80211_rx_result debug_noinline
2491 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2492 {
2493         struct ieee80211_local *local = rx->local;
2494         struct ieee80211_sub_if_data *sdata = rx->sdata;
2495         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2496         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2497         int len = rx->skb->len;
2498
2499         if (!ieee80211_is_action(mgmt->frame_control))
2500                 return RX_CONTINUE;
2501
2502         /* drop too small frames */
2503         if (len < IEEE80211_MIN_ACTION_SIZE)
2504                 return RX_DROP_UNUSABLE;
2505
2506         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2507             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2508             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2509                 return RX_DROP_UNUSABLE;
2510
2511         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2512                 return RX_DROP_UNUSABLE;
2513
2514         switch (mgmt->u.action.category) {
2515         case WLAN_CATEGORY_HT:
2516                 /* reject HT action frames from stations not supporting HT */
2517                 if (!rx->sta->sta.ht_cap.ht_supported)
2518                         goto invalid;
2519
2520                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2521                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2522                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2523                     sdata->vif.type != NL80211_IFTYPE_AP &&
2524                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2525                         break;
2526
2527                 /* verify action & smps_control/chanwidth are present */
2528                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2529                         goto invalid;
2530
2531                 switch (mgmt->u.action.u.ht_smps.action) {
2532                 case WLAN_HT_ACTION_SMPS: {
2533                         struct ieee80211_supported_band *sband;
2534                         enum ieee80211_smps_mode smps_mode;
2535
2536                         /* convert to HT capability */
2537                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2538                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2539                                 smps_mode = IEEE80211_SMPS_OFF;
2540                                 break;
2541                         case WLAN_HT_SMPS_CONTROL_STATIC:
2542                                 smps_mode = IEEE80211_SMPS_STATIC;
2543                                 break;
2544                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2545                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2546                                 break;
2547                         default:
2548                                 goto invalid;
2549                         }
2550
2551                         /* if no change do nothing */
2552                         if (rx->sta->sta.smps_mode == smps_mode)
2553                                 goto handled;
2554                         rx->sta->sta.smps_mode = smps_mode;
2555
2556                         sband = rx->local->hw.wiphy->bands[status->band];
2557
2558                         rate_control_rate_update(local, sband, rx->sta,
2559                                                  IEEE80211_RC_SMPS_CHANGED);
2560                         goto handled;
2561                 }
2562                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2563                         struct ieee80211_supported_band *sband;
2564                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2565                         enum ieee80211_sta_rx_bandwidth new_bw;
2566
2567                         /* If it doesn't support 40 MHz it can't change ... */
2568                         if (!(rx->sta->sta.ht_cap.cap &
2569                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2570                                 goto handled;
2571
2572                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2573                                 new_bw = IEEE80211_STA_RX_BW_20;
2574                         else
2575                                 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2576
2577                         if (rx->sta->sta.bandwidth == new_bw)
2578                                 goto handled;
2579
2580                         sband = rx->local->hw.wiphy->bands[status->band];
2581
2582                         rate_control_rate_update(local, sband, rx->sta,
2583                                                  IEEE80211_RC_BW_CHANGED);
2584                         goto handled;
2585                 }
2586                 default:
2587                         goto invalid;
2588                 }
2589
2590                 break;
2591         case WLAN_CATEGORY_PUBLIC:
2592                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2593                         goto invalid;
2594                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2595                         break;
2596                 if (!rx->sta)
2597                         break;
2598                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2599                         break;
2600                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2601                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2602                         break;
2603                 if (len < offsetof(struct ieee80211_mgmt,
2604                                    u.action.u.ext_chan_switch.variable))
2605                         goto invalid;
2606                 goto queue;
2607         case WLAN_CATEGORY_VHT:
2608                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2609                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2610                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2611                     sdata->vif.type != NL80211_IFTYPE_AP &&
2612                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2613                         break;
2614
2615                 /* verify action code is present */
2616                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2617                         goto invalid;
2618
2619                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2620                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2621                         u8 opmode;
2622
2623                         /* verify opmode is present */
2624                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2625                                 goto invalid;
2626
2627                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2628
2629                         ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2630                                                     opmode, status->band,
2631                                                     false);
2632                         goto handled;
2633                 }
2634                 default:
2635                         break;
2636                 }
2637                 break;
2638         case WLAN_CATEGORY_BACK:
2639                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2640                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2641                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2642                     sdata->vif.type != NL80211_IFTYPE_AP &&
2643                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2644                         break;
2645
2646                 /* verify action_code is present */
2647                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2648                         break;
2649
2650                 switch (mgmt->u.action.u.addba_req.action_code) {
2651                 case WLAN_ACTION_ADDBA_REQ:
2652                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2653                                    sizeof(mgmt->u.action.u.addba_req)))
2654                                 goto invalid;
2655                         break;
2656                 case WLAN_ACTION_ADDBA_RESP:
2657                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2658                                    sizeof(mgmt->u.action.u.addba_resp)))
2659                                 goto invalid;
2660                         break;
2661                 case WLAN_ACTION_DELBA:
2662                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2663                                    sizeof(mgmt->u.action.u.delba)))
2664                                 goto invalid;
2665                         break;
2666                 default:
2667                         goto invalid;
2668                 }
2669
2670                 goto queue;
2671         case WLAN_CATEGORY_SPECTRUM_MGMT:
2672                 /* verify action_code is present */
2673                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2674                         break;
2675
2676                 switch (mgmt->u.action.u.measurement.action_code) {
2677                 case WLAN_ACTION_SPCT_MSR_REQ:
2678                         if (status->band != IEEE80211_BAND_5GHZ)
2679                                 break;
2680
2681                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2682                                    sizeof(mgmt->u.action.u.measurement)))
2683                                 break;
2684
2685                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2686                                 break;
2687
2688                         ieee80211_process_measurement_req(sdata, mgmt, len);
2689                         goto handled;
2690                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2691                         u8 *bssid;
2692                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2693                                    sizeof(mgmt->u.action.u.chan_switch)))
2694                                 break;
2695
2696                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2697                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2698                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2699                                 break;
2700
2701                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2702                                 bssid = sdata->u.mgd.bssid;
2703                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2704                                 bssid = sdata->u.ibss.bssid;
2705                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2706                                 bssid = mgmt->sa;
2707                         else
2708                                 break;
2709
2710                         if (!ether_addr_equal(mgmt->bssid, bssid))
2711                                 break;
2712
2713                         goto queue;
2714                         }
2715                 }
2716                 break;
2717         case WLAN_CATEGORY_SA_QUERY:
2718                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2719                            sizeof(mgmt->u.action.u.sa_query)))
2720                         break;
2721
2722                 switch (mgmt->u.action.u.sa_query.action) {
2723                 case WLAN_ACTION_SA_QUERY_REQUEST:
2724                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2725                                 break;
2726                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2727                         goto handled;
2728                 }
2729                 break;
2730         case WLAN_CATEGORY_SELF_PROTECTED:
2731                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2732                            sizeof(mgmt->u.action.u.self_prot.action_code)))
2733                         break;
2734
2735                 switch (mgmt->u.action.u.self_prot.action_code) {
2736                 case WLAN_SP_MESH_PEERING_OPEN:
2737                 case WLAN_SP_MESH_PEERING_CLOSE:
2738                 case WLAN_SP_MESH_PEERING_CONFIRM:
2739                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2740                                 goto invalid;
2741                         if (sdata->u.mesh.user_mpm)
2742                                 /* userspace handles this frame */
2743                                 break;
2744                         goto queue;
2745                 case WLAN_SP_MGK_INFORM:
2746                 case WLAN_SP_MGK_ACK:
2747                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2748                                 goto invalid;
2749                         break;
2750                 }
2751                 break;
2752         case WLAN_CATEGORY_MESH_ACTION:
2753                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2754                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
2755                         break;
2756
2757                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2758                         break;
2759                 if (mesh_action_is_path_sel(mgmt) &&
2760                     !mesh_path_sel_is_hwmp(sdata))
2761                         break;
2762                 goto queue;
2763         }
2764
2765         return RX_CONTINUE;
2766
2767  invalid:
2768         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2769         /* will return in the next handlers */
2770         return RX_CONTINUE;
2771
2772  handled:
2773         if (rx->sta)
2774                 rx->sta->rx_packets++;
2775         dev_kfree_skb(rx->skb);
2776         return RX_QUEUED;
2777
2778  queue:
2779         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2780         skb_queue_tail(&sdata->skb_queue, rx->skb);
2781         ieee80211_queue_work(&local->hw, &sdata->work);
2782         if (rx->sta)
2783                 rx->sta->rx_packets++;
2784         return RX_QUEUED;
2785 }
2786
2787 static ieee80211_rx_result debug_noinline
2788 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2789 {
2790         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2791         int sig = 0;
2792
2793         /* skip known-bad action frames and return them in the next handler */
2794         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2795                 return RX_CONTINUE;
2796
2797         /*
2798          * Getting here means the kernel doesn't know how to handle
2799          * it, but maybe userspace does ... include returned frames
2800          * so userspace can register for those to know whether ones
2801          * it transmitted were processed or returned.
2802          */
2803
2804         if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2805                 sig = status->signal;
2806
2807         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2808                              rx->skb->data, rx->skb->len, 0)) {
2809                 if (rx->sta)
2810                         rx->sta->rx_packets++;
2811                 dev_kfree_skb(rx->skb);
2812                 return RX_QUEUED;
2813         }
2814
2815         return RX_CONTINUE;
2816 }
2817
2818 static ieee80211_rx_result debug_noinline
2819 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2820 {
2821         struct ieee80211_local *local = rx->local;
2822         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2823         struct sk_buff *nskb;
2824         struct ieee80211_sub_if_data *sdata = rx->sdata;
2825         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2826
2827         if (!ieee80211_is_action(mgmt->frame_control))
2828                 return RX_CONTINUE;
2829
2830         /*
2831          * For AP mode, hostapd is responsible for handling any action
2832          * frames that we didn't handle, including returning unknown
2833          * ones. For all other modes we will return them to the sender,
2834          * setting the 0x80 bit in the action category, as required by
2835          * 802.11-2012 9.24.4.
2836          * Newer versions of hostapd shall also use the management frame
2837          * registration mechanisms, but older ones still use cooked
2838          * monitor interfaces so push all frames there.
2839          */
2840         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2841             (sdata->vif.type == NL80211_IFTYPE_AP ||
2842              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2843                 return RX_DROP_MONITOR;
2844
2845         if (is_multicast_ether_addr(mgmt->da))
2846                 return RX_DROP_MONITOR;
2847
2848         /* do not return rejected action frames */
2849         if (mgmt->u.action.category & 0x80)
2850                 return RX_DROP_UNUSABLE;
2851
2852         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2853                                GFP_ATOMIC);
2854         if (nskb) {
2855                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2856
2857                 nmgmt->u.action.category |= 0x80;
2858                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2859                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2860
2861                 memset(nskb->cb, 0, sizeof(nskb->cb));
2862
2863                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2864                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2865
2866                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2867                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2868                                       IEEE80211_TX_CTL_NO_CCK_RATE;
2869                         if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2870                                 info->hw_queue =
2871                                         local->hw.offchannel_tx_hw_queue;
2872                 }
2873
2874                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2875                                             status->band);
2876         }
2877         dev_kfree_skb(rx->skb);
2878         return RX_QUEUED;
2879 }
2880
2881 static ieee80211_rx_result debug_noinline
2882 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2883 {
2884         struct ieee80211_sub_if_data *sdata = rx->sdata;
2885         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2886         __le16 stype;
2887
2888         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2889
2890         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2891             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2892             sdata->vif.type != NL80211_IFTYPE_OCB &&
2893             sdata->vif.type != NL80211_IFTYPE_STATION)
2894                 return RX_DROP_MONITOR;
2895
2896         switch (stype) {
2897         case cpu_to_le16(IEEE80211_STYPE_AUTH):
2898         case cpu_to_le16(IEEE80211_STYPE_BEACON):
2899         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2900                 /* process for all: mesh, mlme, ibss */
2901                 break;
2902         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2903         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2904         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2905         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2906                 if (is_multicast_ether_addr(mgmt->da) &&
2907                     !is_broadcast_ether_addr(mgmt->da))
2908                         return RX_DROP_MONITOR;
2909
2910                 /* process only for station */
2911                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2912                         return RX_DROP_MONITOR;
2913                 break;
2914         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2915                 /* process only for ibss and mesh */
2916                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2917                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2918                         return RX_DROP_MONITOR;
2919                 break;
2920         default:
2921                 return RX_DROP_MONITOR;
2922         }
2923
2924         /* queue up frame and kick off work to process it */
2925         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2926         skb_queue_tail(&sdata->skb_queue, rx->skb);
2927         ieee80211_queue_work(&rx->local->hw, &sdata->work);
2928         if (rx->sta)
2929                 rx->sta->rx_packets++;
2930
2931         return RX_QUEUED;
2932 }
2933
2934 /* TODO: use IEEE80211_RX_FRAGMENTED */
2935 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2936                                         struct ieee80211_rate *rate)
2937 {
2938         struct ieee80211_sub_if_data *sdata;
2939         struct ieee80211_local *local = rx->local;
2940         struct sk_buff *skb = rx->skb, *skb2;
2941         struct net_device *prev_dev = NULL;
2942         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2943         int needed_headroom;
2944
2945         /*
2946          * If cooked monitor has been processed already, then
2947          * don't do it again. If not, set the flag.
2948          */
2949         if (rx->flags & IEEE80211_RX_CMNTR)
2950                 goto out_free_skb;
2951         rx->flags |= IEEE80211_RX_CMNTR;
2952
2953         /* If there are no cooked monitor interfaces, just free the SKB */
2954         if (!local->cooked_mntrs)
2955                 goto out_free_skb;
2956
2957         /* vendor data is long removed here */
2958         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
2959         /* room for the radiotap header based on driver features */
2960         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
2961
2962         if (skb_headroom(skb) < needed_headroom &&
2963             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2964                 goto out_free_skb;
2965
2966         /* prepend radiotap information */
2967         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2968                                          false);
2969
2970         skb_set_mac_header(skb, 0);
2971         skb->ip_summed = CHECKSUM_UNNECESSARY;
2972         skb->pkt_type = PACKET_OTHERHOST;
2973         skb->protocol = htons(ETH_P_802_2);
2974
2975         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2976                 if (!ieee80211_sdata_running(sdata))
2977                         continue;
2978
2979                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2980                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2981                         continue;
2982
2983                 if (prev_dev) {
2984                         skb2 = skb_clone(skb, GFP_ATOMIC);
2985                         if (skb2) {
2986                                 skb2->dev = prev_dev;
2987                                 netif_receive_skb(skb2);
2988                         }
2989                 }
2990
2991                 prev_dev = sdata->dev;
2992                 sdata->dev->stats.rx_packets++;
2993                 sdata->dev->stats.rx_bytes += skb->len;
2994         }
2995
2996         if (prev_dev) {
2997                 skb->dev = prev_dev;
2998                 netif_receive_skb(skb);
2999                 return;
3000         }
3001
3002  out_free_skb:
3003         dev_kfree_skb(skb);
3004 }
3005
3006 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3007                                          ieee80211_rx_result res)
3008 {
3009         switch (res) {
3010         case RX_DROP_MONITOR:
3011                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3012                 if (rx->sta)
3013                         rx->sta->rx_dropped++;
3014                 /* fall through */
3015         case RX_CONTINUE: {
3016                 struct ieee80211_rate *rate = NULL;
3017                 struct ieee80211_supported_band *sband;
3018                 struct ieee80211_rx_status *status;
3019
3020                 status = IEEE80211_SKB_RXCB((rx->skb));
3021
3022                 sband = rx->local->hw.wiphy->bands[status->band];
3023                 if (!(status->flag & RX_FLAG_HT) &&
3024                     !(status->flag & RX_FLAG_VHT))
3025                         rate = &sband->bitrates[status->rate_idx];
3026
3027                 ieee80211_rx_cooked_monitor(rx, rate);
3028                 break;
3029                 }
3030         case RX_DROP_UNUSABLE:
3031                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3032                 if (rx->sta)
3033                         rx->sta->rx_dropped++;
3034                 dev_kfree_skb(rx->skb);
3035                 break;
3036         case RX_QUEUED:
3037                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3038                 break;
3039         }
3040 }
3041
3042 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3043                                   struct sk_buff_head *frames)
3044 {
3045         ieee80211_rx_result res = RX_DROP_MONITOR;
3046         struct sk_buff *skb;
3047
3048 #define CALL_RXH(rxh)                   \
3049         do {                            \
3050                 res = rxh(rx);          \
3051                 if (res != RX_CONTINUE) \
3052                         goto rxh_next;  \
3053         } while (0);
3054
3055         spin_lock_bh(&rx->local->rx_path_lock);
3056
3057         while ((skb = __skb_dequeue(frames))) {
3058                 /*
3059                  * all the other fields are valid across frames
3060                  * that belong to an aMPDU since they are on the
3061                  * same TID from the same station
3062                  */
3063                 rx->skb = skb;
3064
3065                 CALL_RXH(ieee80211_rx_h_check_more_data)
3066                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
3067                 CALL_RXH(ieee80211_rx_h_sta_process)
3068                 CALL_RXH(ieee80211_rx_h_decrypt)
3069                 CALL_RXH(ieee80211_rx_h_defragment)
3070                 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
3071                 /* must be after MMIC verify so header is counted in MPDU mic */
3072 #ifdef CONFIG_MAC80211_MESH
3073                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3074                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3075 #endif
3076                 CALL_RXH(ieee80211_rx_h_amsdu)
3077                 CALL_RXH(ieee80211_rx_h_data)
3078
3079                 /* special treatment -- needs the queue */
3080                 res = ieee80211_rx_h_ctrl(rx, frames);
3081                 if (res != RX_CONTINUE)
3082                         goto rxh_next;
3083
3084                 CALL_RXH(ieee80211_rx_h_mgmt_check)
3085                 CALL_RXH(ieee80211_rx_h_action)
3086                 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
3087                 CALL_RXH(ieee80211_rx_h_action_return)
3088                 CALL_RXH(ieee80211_rx_h_mgmt)
3089
3090  rxh_next:
3091                 ieee80211_rx_handlers_result(rx, res);
3092
3093 #undef CALL_RXH
3094         }
3095
3096         spin_unlock_bh(&rx->local->rx_path_lock);
3097 }
3098
3099 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3100 {
3101         struct sk_buff_head reorder_release;
3102         ieee80211_rx_result res = RX_DROP_MONITOR;
3103
3104         __skb_queue_head_init(&reorder_release);
3105
3106 #define CALL_RXH(rxh)                   \
3107         do {                            \
3108                 res = rxh(rx);          \
3109                 if (res != RX_CONTINUE) \
3110                         goto rxh_next;  \
3111         } while (0);
3112
3113         CALL_RXH(ieee80211_rx_h_check)
3114
3115         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3116
3117         ieee80211_rx_handlers(rx, &reorder_release);
3118         return;
3119
3120  rxh_next:
3121         ieee80211_rx_handlers_result(rx, res);
3122
3123 #undef CALL_RXH
3124 }
3125
3126 /*
3127  * This function makes calls into the RX path, therefore
3128  * it has to be invoked under RCU read lock.
3129  */
3130 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3131 {
3132         struct sk_buff_head frames;
3133         struct ieee80211_rx_data rx = {
3134                 .sta = sta,
3135                 .sdata = sta->sdata,
3136                 .local = sta->local,
3137                 /* This is OK -- must be QoS data frame */
3138                 .security_idx = tid,
3139                 .seqno_idx = tid,
3140                 .flags = 0,
3141         };
3142         struct tid_ampdu_rx *tid_agg_rx;
3143
3144         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3145         if (!tid_agg_rx)
3146                 return;
3147
3148         __skb_queue_head_init(&frames);
3149
3150         spin_lock(&tid_agg_rx->reorder_lock);
3151         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3152         spin_unlock(&tid_agg_rx->reorder_lock);
3153
3154         ieee80211_rx_handlers(&rx, &frames);
3155 }
3156
3157 /* main receive path */
3158
3159 static bool prepare_for_handlers(struct ieee80211_rx_data *rx,
3160                                  struct ieee80211_hdr *hdr)
3161 {
3162         struct ieee80211_sub_if_data *sdata = rx->sdata;
3163         struct sk_buff *skb = rx->skb;
3164         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3165         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3166         int multicast = is_multicast_ether_addr(hdr->addr1);
3167
3168         switch (sdata->vif.type) {
3169         case NL80211_IFTYPE_STATION:
3170                 if (!bssid && !sdata->u.mgd.use_4addr)
3171                         return false;
3172                 if (!multicast &&
3173                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3174                         if (!(sdata->dev->flags & IFF_PROMISC) ||
3175                             sdata->u.mgd.use_4addr)
3176                                 return false;
3177                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3178                 }
3179                 break;
3180         case NL80211_IFTYPE_ADHOC:
3181                 if (!bssid)
3182                         return false;
3183                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3184                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3185                         return false;
3186                 if (ieee80211_is_beacon(hdr->frame_control)) {
3187                         return true;
3188                 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3189                         return false;
3190                 } else if (!multicast &&
3191                            !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3192                         if (!(sdata->dev->flags & IFF_PROMISC))
3193                                 return false;
3194                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3195                 } else if (!rx->sta) {
3196                         int rate_idx;
3197                         if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3198                                 rate_idx = 0; /* TODO: HT/VHT rates */
3199                         else
3200                                 rate_idx = status->rate_idx;
3201                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3202                                                  BIT(rate_idx));
3203                 }
3204                 break;
3205         case NL80211_IFTYPE_OCB:
3206                 if (!bssid)
3207                         return false;
3208                 if (ieee80211_is_beacon(hdr->frame_control)) {
3209                         return false;
3210                 } else if (!is_broadcast_ether_addr(bssid)) {
3211                         ocb_dbg(sdata, "BSSID mismatch in OCB mode!\n");
3212                         return false;
3213                 } else if (!multicast &&
3214                            !ether_addr_equal(sdata->dev->dev_addr,
3215                                              hdr->addr1)) {
3216                         /* if we are in promisc mode we also accept
3217                          * packets not destined for us
3218                          */
3219                         if (!(sdata->dev->flags & IFF_PROMISC))
3220                                 return false;
3221                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
3222                 } else if (!rx->sta) {
3223                         int rate_idx;
3224                         if (status->flag & RX_FLAG_HT)
3225                                 rate_idx = 0; /* TODO: HT rates */
3226                         else
3227                                 rate_idx = status->rate_idx;
3228                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3229                                                 BIT(rate_idx));
3230                 }
3231                 break;
3232         case NL80211_IFTYPE_MESH_POINT:
3233                 if (!multicast &&
3234                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3235                         if (!(sdata->dev->flags & IFF_PROMISC))
3236                                 return false;
3237
3238                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3239                 }
3240                 break;
3241         case NL80211_IFTYPE_AP_VLAN:
3242         case NL80211_IFTYPE_AP:
3243                 if (!bssid) {
3244                         if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3245                                 return false;
3246                 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3247                         /*
3248                          * Accept public action frames even when the
3249                          * BSSID doesn't match, this is used for P2P
3250                          * and location updates. Note that mac80211
3251                          * itself never looks at these frames.
3252                          */
3253                         if (!multicast &&
3254                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3255                                 return false;
3256                         if (ieee80211_is_public_action(hdr, skb->len))
3257                                 return true;
3258                         if (!ieee80211_is_beacon(hdr->frame_control))
3259                                 return false;
3260                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3261                 } else if (!ieee80211_has_tods(hdr->frame_control)) {
3262                         /* ignore data frames to TDLS-peers */
3263                         if (ieee80211_is_data(hdr->frame_control))
3264                                 return false;
3265                         /* ignore action frames to TDLS-peers */
3266                         if (ieee80211_is_action(hdr->frame_control) &&
3267                             !ether_addr_equal(bssid, hdr->addr1))
3268                                 return false;
3269                 }
3270                 break;
3271         case NL80211_IFTYPE_WDS:
3272                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3273                         return false;
3274                 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3275                         return false;
3276                 break;
3277         case NL80211_IFTYPE_P2P_DEVICE:
3278                 if (!ieee80211_is_public_action(hdr, skb->len) &&
3279                     !ieee80211_is_probe_req(hdr->frame_control) &&
3280                     !ieee80211_is_probe_resp(hdr->frame_control) &&
3281                     !ieee80211_is_beacon(hdr->frame_control))
3282                         return false;
3283                 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3284                     !multicast)
3285                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3286                 break;
3287         default:
3288                 /* should never get here */
3289                 WARN_ON_ONCE(1);
3290                 break;
3291         }
3292
3293         return true;
3294 }
3295
3296 /*
3297  * This function returns whether or not the SKB
3298  * was destined for RX processing or not, which,
3299  * if consume is true, is equivalent to whether
3300  * or not the skb was consumed.
3301  */
3302 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3303                                             struct sk_buff *skb, bool consume)
3304 {
3305         struct ieee80211_local *local = rx->local;
3306         struct ieee80211_sub_if_data *sdata = rx->sdata;
3307         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3308         struct ieee80211_hdr *hdr = (void *)skb->data;
3309
3310         rx->skb = skb;
3311         status->rx_flags |= IEEE80211_RX_RA_MATCH;
3312
3313         if (!prepare_for_handlers(rx, hdr))
3314                 return false;
3315
3316         if (!consume) {
3317                 skb = skb_copy(skb, GFP_ATOMIC);
3318                 if (!skb) {
3319                         if (net_ratelimit())
3320                                 wiphy_debug(local->hw.wiphy,
3321                                         "failed to copy skb for %s\n",
3322                                         sdata->name);
3323                         return true;
3324                 }
3325
3326                 rx->skb = skb;
3327         }
3328
3329         ieee80211_invoke_rx_handlers(rx);
3330         return true;
3331 }
3332
3333 /*
3334  * This is the actual Rx frames handler. as it belongs to Rx path it must
3335  * be called with rcu_read_lock protection.
3336  */
3337 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3338                                          struct sk_buff *skb)
3339 {
3340         struct ieee80211_local *local = hw_to_local(hw);
3341         struct ieee80211_sub_if_data *sdata;
3342         struct ieee80211_hdr *hdr;
3343         __le16 fc;
3344         struct ieee80211_rx_data rx;
3345         struct ieee80211_sub_if_data *prev;
3346         struct sta_info *sta, *tmp, *prev_sta;
3347         int err = 0;
3348
3349         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3350         memset(&rx, 0, sizeof(rx));
3351         rx.skb = skb;
3352         rx.local = local;
3353
3354         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3355                 local->dot11ReceivedFragmentCount++;
3356
3357         if (ieee80211_is_mgmt(fc)) {
3358                 /* drop frame if too short for header */
3359                 if (skb->len < ieee80211_hdrlen(fc))
3360                         err = -ENOBUFS;
3361                 else
3362                         err = skb_linearize(skb);
3363         } else {
3364                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3365         }
3366
3367         if (err) {
3368                 dev_kfree_skb(skb);
3369                 return;
3370         }
3371
3372         hdr = (struct ieee80211_hdr *)skb->data;
3373         ieee80211_parse_qos(&rx);
3374         ieee80211_verify_alignment(&rx);
3375
3376         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3377                      ieee80211_is_beacon(hdr->frame_control)))
3378                 ieee80211_scan_rx(local, skb);
3379
3380         if (ieee80211_is_data(fc)) {
3381                 prev_sta = NULL;
3382
3383                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
3384                         if (!prev_sta) {
3385                                 prev_sta = sta;
3386                                 continue;
3387                         }
3388
3389                         rx.sta = prev_sta;
3390                         rx.sdata = prev_sta->sdata;
3391                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
3392
3393                         prev_sta = sta;
3394                 }
3395
3396                 if (prev_sta) {
3397                         rx.sta = prev_sta;
3398                         rx.sdata = prev_sta->sdata;
3399
3400                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3401                                 return;
3402                         goto out;
3403                 }
3404         }
3405
3406         prev = NULL;
3407
3408         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3409                 if (!ieee80211_sdata_running(sdata))
3410                         continue;
3411
3412                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3413                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3414                         continue;
3415
3416                 /*
3417                  * frame is destined for this interface, but if it's
3418                  * not also for the previous one we handle that after
3419                  * the loop to avoid copying the SKB once too much
3420                  */
3421
3422                 if (!prev) {
3423                         prev = sdata;
3424                         continue;
3425                 }
3426
3427                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3428                 rx.sdata = prev;
3429                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3430
3431                 prev = sdata;
3432         }
3433
3434         if (prev) {
3435                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3436                 rx.sdata = prev;
3437
3438                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3439                         return;
3440         }
3441
3442  out:
3443         dev_kfree_skb(skb);
3444 }
3445
3446 /*
3447  * This is the receive path handler. It is called by a low level driver when an
3448  * 802.11 MPDU is received from the hardware.
3449  */
3450 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3451 {
3452         struct ieee80211_local *local = hw_to_local(hw);
3453         struct ieee80211_rate *rate = NULL;
3454         struct ieee80211_supported_band *sband;
3455         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3456
3457         WARN_ON_ONCE(softirq_count() == 0);
3458
3459         if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3460                 goto drop;
3461
3462         sband = local->hw.wiphy->bands[status->band];
3463         if (WARN_ON(!sband))
3464                 goto drop;
3465
3466         /*
3467          * If we're suspending, it is possible although not too likely
3468          * that we'd be receiving frames after having already partially
3469          * quiesced the stack. We can't process such frames then since
3470          * that might, for example, cause stations to be added or other
3471          * driver callbacks be invoked.
3472          */
3473         if (unlikely(local->quiescing || local->suspended))
3474                 goto drop;
3475
3476         /* We might be during a HW reconfig, prevent Rx for the same reason */
3477         if (unlikely(local->in_reconfig))
3478                 goto drop;
3479
3480         /*
3481          * The same happens when we're not even started,
3482          * but that's worth a warning.
3483          */
3484         if (WARN_ON(!local->started))
3485                 goto drop;
3486
3487         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3488                 /*
3489                  * Validate the rate, unless a PLCP error means that
3490                  * we probably can't have a valid rate here anyway.
3491                  */
3492
3493                 if (status->flag & RX_FLAG_HT) {
3494                         /*
3495                          * rate_idx is MCS index, which can be [0-76]
3496                          * as documented on:
3497                          *
3498                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3499                          *
3500                          * Anything else would be some sort of driver or
3501                          * hardware error. The driver should catch hardware
3502                          * errors.
3503                          */
3504                         if (WARN(status->rate_idx > 76,
3505                                  "Rate marked as an HT rate but passed "
3506                                  "status->rate_idx is not "
3507                                  "an MCS index [0-76]: %d (0x%02x)\n",
3508                                  status->rate_idx,
3509                                  status->rate_idx))
3510                                 goto drop;
3511                 } else if (status->flag & RX_FLAG_VHT) {
3512                         if (WARN_ONCE(status->rate_idx > 9 ||
3513                                       !status->vht_nss ||
3514                                       status->vht_nss > 8,
3515                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3516                                       status->rate_idx, status->vht_nss))
3517                                 goto drop;
3518                 } else {
3519                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3520                                 goto drop;
3521                         rate = &sband->bitrates[status->rate_idx];
3522                 }
3523         }
3524
3525         status->rx_flags = 0;
3526
3527         /*
3528          * key references and virtual interfaces are protected using RCU
3529          * and this requires that we are in a read-side RCU section during
3530          * receive processing
3531          */
3532         rcu_read_lock();
3533
3534         /*
3535          * Frames with failed FCS/PLCP checksum are not returned,
3536          * all other frames are returned without radiotap header
3537          * if it was previously present.
3538          * Also, frames with less than 16 bytes are dropped.
3539          */
3540         skb = ieee80211_rx_monitor(local, skb, rate);
3541         if (!skb) {
3542                 rcu_read_unlock();
3543                 return;
3544         }
3545
3546         ieee80211_tpt_led_trig_rx(local,
3547                         ((struct ieee80211_hdr *)skb->data)->frame_control,
3548                         skb->len);
3549         __ieee80211_rx_handle_packet(hw, skb);
3550
3551         rcu_read_unlock();
3552
3553         return;
3554  drop:
3555         kfree_skb(skb);
3556 }
3557 EXPORT_SYMBOL(ieee80211_rx);
3558
3559 /* This is a version of the rx handler that can be called from hard irq
3560  * context. Post the skb on the queue and schedule the tasklet */
3561 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3562 {
3563         struct ieee80211_local *local = hw_to_local(hw);
3564
3565         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3566
3567         skb->pkt_type = IEEE80211_RX_MSG;
3568         skb_queue_tail(&local->skb_queue, skb);
3569         tasklet_schedule(&local->tasklet);
3570 }
3571 EXPORT_SYMBOL(ieee80211_rx_irqsafe);