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 <[email protected]>
   5  * Copyright 2007-2010  Johannes Berg <[email protected]>
   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_dup(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
1060         if (rx->skb->len < 24)
1061                 return RX_CONTINUE;
1062
1063         if (ieee80211_is_ctl(hdr->frame_control) ||
1064             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1065             is_multicast_ether_addr(hdr->addr1))
1066                 return RX_CONTINUE;
1067
1068         if (rx->sta) {
1069                 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1070                              rx->sta->last_seq_ctrl[rx->seqno_idx] ==
1071                              hdr->seq_ctrl)) {
1072                         if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
1073                                 rx->local->dot11FrameDuplicateCount++;
1074                                 rx->sta->num_duplicates++;
1075                         }
1076                         return RX_DROP_UNUSABLE;
1077                 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1078                         rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1079                 }
1080         }
1081
1082         return RX_CONTINUE;
1083 }
1084
1085 static ieee80211_rx_result debug_noinline
1086 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1087 {
1088         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1089
1090         if (unlikely(rx->skb->len < 16)) {
1091                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
1092                 return RX_DROP_MONITOR;
1093         }
1094
1095         /* Drop disallowed frame classes based on STA auth/assoc state;
1096          * IEEE 802.11, Chap 5.5.
1097          *
1098          * mac80211 filters only based on association state, i.e. it drops
1099          * Class 3 frames from not associated stations. hostapd sends
1100          * deauth/disassoc frames when needed. In addition, hostapd is
1101          * responsible for filtering on both auth and assoc states.
1102          */
1103
1104         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1105                 return ieee80211_rx_mesh_check(rx);
1106
1107         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1108                       ieee80211_is_pspoll(hdr->frame_control)) &&
1109                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1110                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1111                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1112                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1113                 /*
1114                  * accept port control frames from the AP even when it's not
1115                  * yet marked ASSOC to prevent a race where we don't set the
1116                  * assoc bit quickly enough before it sends the first frame
1117                  */
1118                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1119                     ieee80211_is_data_present(hdr->frame_control)) {
1120                         unsigned int hdrlen;
1121                         __be16 ethertype;
1122
1123                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1124
1125                         if (rx->skb->len < hdrlen + 8)
1126                                 return RX_DROP_MONITOR;
1127
1128                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1129                         if (ethertype == rx->sdata->control_port_protocol)
1130                                 return RX_CONTINUE;
1131                 }
1132
1133                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1134                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1135                                                hdr->addr2,
1136                                                GFP_ATOMIC))
1137                         return RX_DROP_UNUSABLE;
1138
1139                 return RX_DROP_MONITOR;
1140         }
1141
1142         return RX_CONTINUE;
1143 }
1144
1145
1146 static ieee80211_rx_result debug_noinline
1147 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1148 {
1149         struct ieee80211_local *local;
1150         struct ieee80211_hdr *hdr;
1151         struct sk_buff *skb;
1152
1153         local = rx->local;
1154         skb = rx->skb;
1155         hdr = (struct ieee80211_hdr *) skb->data;
1156
1157         if (!local->pspolling)
1158                 return RX_CONTINUE;
1159
1160         if (!ieee80211_has_fromds(hdr->frame_control))
1161                 /* this is not from AP */
1162                 return RX_CONTINUE;
1163
1164         if (!ieee80211_is_data(hdr->frame_control))
1165                 return RX_CONTINUE;
1166
1167         if (!ieee80211_has_moredata(hdr->frame_control)) {
1168                 /* AP has no more frames buffered for us */
1169                 local->pspolling = false;
1170                 return RX_CONTINUE;
1171         }
1172
1173         /* more data bit is set, let's request a new frame from the AP */
1174         ieee80211_send_pspoll(local, rx->sdata);
1175
1176         return RX_CONTINUE;
1177 }
1178
1179 static void sta_ps_start(struct sta_info *sta)
1180 {
1181         struct ieee80211_sub_if_data *sdata = sta->sdata;
1182         struct ieee80211_local *local = sdata->local;
1183         struct ps_data *ps;
1184
1185         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1186             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1187                 ps = &sdata->bss->ps;
1188         else
1189                 return;
1190
1191         atomic_inc(&ps->num_sta_ps);
1192         set_sta_flag(sta, WLAN_STA_PS_STA);
1193         if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1194                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1195         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1196                sta->sta.addr, sta->sta.aid);
1197 }
1198
1199 static void sta_ps_end(struct sta_info *sta)
1200 {
1201         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1202                sta->sta.addr, sta->sta.aid);
1203
1204         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1205                 /*
1206                  * Clear the flag only if the other one is still set
1207                  * so that the TX path won't start TX'ing new frames
1208                  * directly ... In the case that the driver flag isn't
1209                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1210                  */
1211                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1212                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1213                        sta->sta.addr, sta->sta.aid);
1214                 return;
1215         }
1216
1217         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1218         clear_sta_flag(sta, WLAN_STA_PS_STA);
1219         ieee80211_sta_ps_deliver_wakeup(sta);
1220 }
1221
1222 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1223 {
1224         struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1225         bool in_ps;
1226
1227         WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1228
1229         /* Don't let the same PS state be set twice */
1230         in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1231         if ((start && in_ps) || (!start && !in_ps))
1232                 return -EINVAL;
1233
1234         if (start)
1235                 sta_ps_start(sta_inf);
1236         else
1237                 sta_ps_end(sta_inf);
1238
1239         return 0;
1240 }
1241 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1242
1243 static ieee80211_rx_result debug_noinline
1244 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1245 {
1246         struct ieee80211_sub_if_data *sdata = rx->sdata;
1247         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1248         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1249         int tid, ac;
1250
1251         if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1252                 return RX_CONTINUE;
1253
1254         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1255             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1256                 return RX_CONTINUE;
1257
1258         /*
1259          * The device handles station powersave, so don't do anything about
1260          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1261          * it to mac80211 since they're handled.)
1262          */
1263         if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1264                 return RX_CONTINUE;
1265
1266         /*
1267          * Don't do anything if the station isn't already asleep. In
1268          * the uAPSD case, the station will probably be marked asleep,
1269          * in the PS-Poll case the station must be confused ...
1270          */
1271         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1272                 return RX_CONTINUE;
1273
1274         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1275                 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1276                         if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1277                                 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1278                         else
1279                                 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1280                 }
1281
1282                 /* Free PS Poll skb here instead of returning RX_DROP that would
1283                  * count as an dropped frame. */
1284                 dev_kfree_skb(rx->skb);
1285
1286                 return RX_QUEUED;
1287         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1288                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1289                    ieee80211_has_pm(hdr->frame_control) &&
1290                    (ieee80211_is_data_qos(hdr->frame_control) ||
1291                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1292                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1293                 ac = ieee802_1d_to_ac[tid & 7];
1294
1295                 /*
1296                  * If this AC is not trigger-enabled do nothing.
1297                  *
1298                  * NB: This could/should check a separate bitmap of trigger-
1299                  * enabled queues, but for now we only implement uAPSD w/o
1300                  * TSPEC changes to the ACs, so they're always the same.
1301                  */
1302                 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1303                         return RX_CONTINUE;
1304
1305                 /* if we are in a service period, do nothing */
1306                 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1307                         return RX_CONTINUE;
1308
1309                 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1310                         ieee80211_sta_ps_deliver_uapsd(rx->sta);
1311                 else
1312                         set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1313         }
1314
1315         return RX_CONTINUE;
1316 }
1317
1318 static ieee80211_rx_result debug_noinline
1319 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1320 {
1321         struct sta_info *sta = rx->sta;
1322         struct sk_buff *skb = rx->skb;
1323         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1324         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1325         int i;
1326
1327         if (!sta)
1328                 return RX_CONTINUE;
1329
1330         /*
1331          * Update last_rx only for IBSS packets which are for the current
1332          * BSSID and for station already AUTHORIZED to avoid keeping the
1333          * current IBSS network alive in cases where other STAs start
1334          * using different BSSID. This will also give the station another
1335          * chance to restart the authentication/authorization in case
1336          * something went wrong the first time.
1337          */
1338         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1339                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1340                                                 NL80211_IFTYPE_ADHOC);
1341                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1342                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1343                         sta->last_rx = jiffies;
1344                         if (ieee80211_is_data(hdr->frame_control) &&
1345                             !is_multicast_ether_addr(hdr->addr1)) {
1346                                 sta->last_rx_rate_idx = status->rate_idx;
1347                                 sta->last_rx_rate_flag = status->flag;
1348                                 sta->last_rx_rate_vht_flag = status->vht_flag;
1349                                 sta->last_rx_rate_vht_nss = status->vht_nss;
1350                         }
1351                 }
1352         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1353                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1354                                                 NL80211_IFTYPE_OCB);
1355                 /* OCB uses wild-card BSSID */
1356                 if (is_broadcast_ether_addr(bssid))
1357                         sta->last_rx = jiffies;
1358         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1359                 /*
1360                  * Mesh beacons will update last_rx when if they are found to
1361                  * match the current local configuration when processed.
1362                  */
1363                 sta->last_rx = jiffies;
1364                 if (ieee80211_is_data(hdr->frame_control)) {
1365                         sta->last_rx_rate_idx = status->rate_idx;
1366                         sta->last_rx_rate_flag = status->flag;
1367                         sta->last_rx_rate_vht_flag = status->vht_flag;
1368                         sta->last_rx_rate_vht_nss = status->vht_nss;
1369                 }
1370         }
1371
1372         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1373                 return RX_CONTINUE;
1374
1375         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1376                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1377
1378         sta->rx_fragments++;
1379         sta->rx_bytes += rx->skb->len;
1380         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1381                 sta->last_signal = status->signal;
1382                 ewma_add(&sta->avg_signal, -status->signal);
1383         }
1384
1385         if (status->chains) {
1386                 sta->chains = status->chains;
1387                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1388                         int signal = status->chain_signal[i];
1389
1390                         if (!(status->chains & BIT(i)))
1391                                 continue;
1392
1393                         sta->chain_signal_last[i] = signal;
1394                         ewma_add(&sta->chain_signal_avg[i], -signal);
1395                 }
1396         }
1397
1398         /*
1399          * Change STA power saving mode only at the end of a frame
1400          * exchange sequence.
1401          */
1402         if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1403             !ieee80211_has_morefrags(hdr->frame_control) &&
1404             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1405             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1406              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1407             /* PM bit is only checked in frames where it isn't reserved,
1408              * in AP mode it's reserved in non-bufferable management frames
1409              * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1410              */
1411             (!ieee80211_is_mgmt(hdr->frame_control) ||
1412              ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1413                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1414                         if (!ieee80211_has_pm(hdr->frame_control))
1415                                 sta_ps_end(sta);
1416                 } else {
1417                         if (ieee80211_has_pm(hdr->frame_control))
1418                                 sta_ps_start(sta);
1419                 }
1420         }
1421
1422         /* mesh power save support */
1423         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1424                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1425
1426         /*
1427          * Drop (qos-)data::nullfunc frames silently, since they
1428          * are used only to control station power saving mode.
1429          */
1430         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1431             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1432                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1433
1434                 /*
1435                  * If we receive a 4-addr nullfunc frame from a STA
1436                  * that was not moved to a 4-addr STA vlan yet send
1437                  * the event to userspace and for older hostapd drop
1438                  * the frame to the monitor interface.
1439                  */
1440                 if (ieee80211_has_a4(hdr->frame_control) &&
1441                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1442                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1443                       !rx->sdata->u.vlan.sta))) {
1444                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1445                                 cfg80211_rx_unexpected_4addr_frame(
1446                                         rx->sdata->dev, sta->sta.addr,
1447                                         GFP_ATOMIC);
1448                         return RX_DROP_MONITOR;
1449                 }
1450                 /*
1451                  * Update counter and free packet here to avoid
1452                  * counting this as a dropped packed.
1453                  */
1454                 sta->rx_packets++;
1455                 dev_kfree_skb(rx->skb);
1456                 return RX_QUEUED;
1457         }
1458
1459         return RX_CONTINUE;
1460 } /* ieee80211_rx_h_sta_process */
1461
1462 static ieee80211_rx_result debug_noinline
1463 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1464 {
1465         struct sk_buff *skb = rx->skb;
1466         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1467         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1468         int keyidx;
1469         int hdrlen;
1470         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1471         struct ieee80211_key *sta_ptk = NULL;
1472         int mmie_keyidx = -1;
1473         __le16 fc;
1474         const struct ieee80211_cipher_scheme *cs = NULL;
1475
1476         /*
1477          * Key selection 101
1478          *
1479          * There are four types of keys:
1480          *  - GTK (group keys)
1481          *  - IGTK (group keys for management frames)
1482          *  - PTK (pairwise keys)
1483          *  - STK (station-to-station pairwise keys)
1484          *
1485          * When selecting a key, we have to distinguish between multicast
1486          * (including broadcast) and unicast frames, the latter can only
1487          * use PTKs and STKs while the former always use GTKs and IGTKs.
1488          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1489          * unicast frames can also use key indices like GTKs. Hence, if we
1490          * don't have a PTK/STK we check the key index for a WEP key.
1491          *
1492          * Note that in a regular BSS, multicast frames are sent by the
1493          * AP only, associated stations unicast the frame to the AP first
1494          * which then multicasts it on their behalf.
1495          *
1496          * There is also a slight problem in IBSS mode: GTKs are negotiated
1497          * with each station, that is something we don't currently handle.
1498          * The spec seems to expect that one negotiates the same key with
1499          * every station but there's no such requirement; VLANs could be
1500          * possible.
1501          */
1502
1503         /*
1504          * No point in finding a key and decrypting if the frame is neither
1505          * addressed to us nor a multicast frame.
1506          */
1507         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1508                 return RX_CONTINUE;
1509
1510         /* start without a key */
1511         rx->key = NULL;
1512         fc = hdr->frame_control;
1513
1514         if (rx->sta) {
1515                 int keyid = rx->sta->ptk_idx;
1516
1517                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1518                         cs = rx->sta->cipher_scheme;
1519                         keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1520                         if (unlikely(keyid < 0))
1521                                 return RX_DROP_UNUSABLE;
1522                 }
1523                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1524         }
1525
1526         if (!ieee80211_has_protected(fc))
1527                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1528
1529         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1530                 rx->key = sta_ptk;
1531                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1532                     (status->flag & RX_FLAG_IV_STRIPPED))
1533                         return RX_CONTINUE;
1534                 /* Skip decryption if the frame is not protected. */
1535                 if (!ieee80211_has_protected(fc))
1536                         return RX_CONTINUE;
1537         } else if (mmie_keyidx >= 0) {
1538                 /* Broadcast/multicast robust management frame / BIP */
1539                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1540                     (status->flag & RX_FLAG_IV_STRIPPED))
1541                         return RX_CONTINUE;
1542
1543                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1544                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1545                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1546                 if (rx->sta)
1547                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1548                 if (!rx->key)
1549                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1550         } else if (!ieee80211_has_protected(fc)) {
1551                 /*
1552                  * The frame was not protected, so skip decryption. However, we
1553                  * need to set rx->key if there is a key that could have been
1554                  * used so that the frame may be dropped if encryption would
1555                  * have been expected.
1556                  */
1557                 struct ieee80211_key *key = NULL;
1558                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1559                 int i;
1560
1561                 if (ieee80211_is_mgmt(fc) &&
1562                     is_multicast_ether_addr(hdr->addr1) &&
1563                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1564                         rx->key = key;
1565                 else {
1566                         if (rx->sta) {
1567                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1568                                         key = rcu_dereference(rx->sta->gtk[i]);
1569                                         if (key)
1570                                                 break;
1571                                 }
1572                         }
1573                         if (!key) {
1574                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1575                                         key = rcu_dereference(sdata->keys[i]);
1576                                         if (key)
1577                                                 break;
1578                                 }
1579                         }
1580                         if (key)
1581                                 rx->key = key;
1582                 }
1583                 return RX_CONTINUE;
1584         } else {
1585                 u8 keyid;
1586
1587                 /*
1588                  * The device doesn't give us the IV so we won't be
1589                  * able to look up the key. That's ok though, we
1590                  * don't need to decrypt the frame, we just won't
1591                  * be able to keep statistics accurate.
1592                  * Except for key threshold notifications, should
1593                  * we somehow allow the driver to tell us which key
1594                  * the hardware used if this flag is set?
1595                  */
1596                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1597                     (status->flag & RX_FLAG_IV_STRIPPED))
1598                         return RX_CONTINUE;
1599
1600                 hdrlen = ieee80211_hdrlen(fc);
1601
1602                 if (cs) {
1603                         keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
1604
1605                         if (unlikely(keyidx < 0))
1606                                 return RX_DROP_UNUSABLE;
1607                 } else {
1608                         if (rx->skb->len < 8 + hdrlen)
1609                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1610                         /*
1611                          * no need to call ieee80211_wep_get_keyidx,
1612                          * it verifies a bunch of things we've done already
1613                          */
1614                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1615                         keyidx = keyid >> 6;
1616                 }
1617
1618                 /* check per-station GTK first, if multicast packet */
1619                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1620                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1621
1622                 /* if not found, try default key */
1623                 if (!rx->key) {
1624                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1625
1626                         /*
1627                          * RSNA-protected unicast frames should always be
1628                          * sent with pairwise or station-to-station keys,
1629                          * but for WEP we allow using a key index as well.
1630                          */
1631                         if (rx->key &&
1632                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1633                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1634                             !is_multicast_ether_addr(hdr->addr1))
1635                                 rx->key = NULL;
1636                 }
1637         }
1638
1639         if (rx->key) {
1640                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1641                         return RX_DROP_MONITOR;
1642
1643                 rx->key->tx_rx_count++;
1644                 /* TODO: add threshold stuff again */
1645         } else {
1646                 return RX_DROP_MONITOR;
1647         }
1648
1649         switch (rx->key->conf.cipher) {
1650         case WLAN_CIPHER_SUITE_WEP40:
1651         case WLAN_CIPHER_SUITE_WEP104:
1652                 result = ieee80211_crypto_wep_decrypt(rx);
1653                 break;
1654         case WLAN_CIPHER_SUITE_TKIP:
1655                 result = ieee80211_crypto_tkip_decrypt(rx);
1656                 break;
1657         case WLAN_CIPHER_SUITE_CCMP:
1658                 result = ieee80211_crypto_ccmp_decrypt(rx);
1659                 break;
1660         case WLAN_CIPHER_SUITE_AES_CMAC:
1661                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1662                 break;
1663         default:
1664                 result = ieee80211_crypto_hw_decrypt(rx);
1665         }
1666
1667         /* the hdr variable is invalid after the decrypt handlers */
1668
1669         /* either the frame has been decrypted or will be dropped */
1670         status->flag |= RX_FLAG_DECRYPTED;
1671
1672         return result;
1673 }
1674
1675 static inline struct ieee80211_fragment_entry *
1676 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1677                          unsigned int frag, unsigned int seq, int rx_queue,
1678                          struct sk_buff **skb)
1679 {
1680         struct ieee80211_fragment_entry *entry;
1681
1682         entry = &sdata->fragments[sdata->fragment_next++];
1683         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1684                 sdata->fragment_next = 0;
1685
1686         if (!skb_queue_empty(&entry->skb_list))
1687                 __skb_queue_purge(&entry->skb_list);
1688
1689         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1690         *skb = NULL;
1691         entry->first_frag_time = jiffies;
1692         entry->seq = seq;
1693         entry->rx_queue = rx_queue;
1694         entry->last_frag = frag;
1695         entry->ccmp = 0;
1696         entry->extra_len = 0;
1697
1698         return entry;
1699 }
1700
1701 static inline struct ieee80211_fragment_entry *
1702 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1703                           unsigned int frag, unsigned int seq,
1704                           int rx_queue, struct ieee80211_hdr *hdr)
1705 {
1706         struct ieee80211_fragment_entry *entry;
1707         int i, idx;
1708
1709         idx = sdata->fragment_next;
1710         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1711                 struct ieee80211_hdr *f_hdr;
1712
1713                 idx--;
1714                 if (idx < 0)
1715                         idx = IEEE80211_FRAGMENT_MAX - 1;
1716
1717                 entry = &sdata->fragments[idx];
1718                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1719                     entry->rx_queue != rx_queue ||
1720                     entry->last_frag + 1 != frag)
1721                         continue;
1722
1723                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1724
1725                 /*
1726                  * Check ftype and addresses are equal, else check next fragment
1727                  */
1728                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1729                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1730                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1731                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1732                         continue;
1733
1734                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1735                         __skb_queue_purge(&entry->skb_list);
1736                         continue;
1737                 }
1738                 return entry;
1739         }
1740
1741         return NULL;
1742 }
1743
1744 static ieee80211_rx_result debug_noinline
1745 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1746 {
1747         struct ieee80211_hdr *hdr;
1748         u16 sc;
1749         __le16 fc;
1750         unsigned int frag, seq;
1751         struct ieee80211_fragment_entry *entry;
1752         struct sk_buff *skb;
1753         struct ieee80211_rx_status *status;
1754
1755         hdr = (struct ieee80211_hdr *)rx->skb->data;
1756         fc = hdr->frame_control;
1757
1758         if (ieee80211_is_ctl(fc))
1759                 return RX_CONTINUE;
1760
1761         sc = le16_to_cpu(hdr->seq_ctrl);
1762         frag = sc & IEEE80211_SCTL_FRAG;
1763
1764         if (is_multicast_ether_addr(hdr->addr1)) {
1765                 rx->local->dot11MulticastReceivedFrameCount++;
1766                 goto out_no_led;
1767         }
1768
1769         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1770                 goto out;
1771
1772         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1773
1774         if (skb_linearize(rx->skb))
1775                 return RX_DROP_UNUSABLE;
1776
1777         /*
1778          *  skb_linearize() might change the skb->data and
1779          *  previously cached variables (in this case, hdr) need to
1780          *  be refreshed with the new data.
1781          */
1782         hdr = (struct ieee80211_hdr *)rx->skb->data;
1783         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1784
1785         if (frag == 0) {
1786                 /* This is the first fragment of a new frame. */
1787                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1788                                                  rx->seqno_idx, &(rx->skb));
1789                 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1790                     ieee80211_has_protected(fc)) {
1791                         int queue = rx->security_idx;
1792                         /* Store CCMP PN so that we can verify that the next
1793                          * fragment has a sequential PN value. */
1794                         entry->ccmp = 1;
1795                         memcpy(entry->last_pn,
1796                                rx->key->u.ccmp.rx_pn[queue],
1797                                IEEE80211_CCMP_PN_LEN);
1798                 }
1799                 return RX_QUEUED;
1800         }
1801
1802         /* This is a fragment for a frame that should already be pending in
1803          * fragment cache. Add this fragment to the end of the pending entry.
1804          */
1805         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1806                                           rx->seqno_idx, hdr);
1807         if (!entry) {
1808                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1809                 return RX_DROP_MONITOR;
1810         }
1811
1812         /* Verify that MPDUs within one MSDU have sequential PN values.
1813          * (IEEE 802.11i, 8.3.3.4.5) */
1814         if (entry->ccmp) {
1815                 int i;
1816                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1817                 int queue;
1818                 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1819                         return RX_DROP_UNUSABLE;
1820                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1821                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1822                         pn[i]++;
1823                         if (pn[i])
1824                                 break;
1825                 }
1826                 queue = rx->security_idx;
1827                 rpn = rx->key->u.ccmp.rx_pn[queue];
1828                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1829                         return RX_DROP_UNUSABLE;
1830                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1831         }
1832
1833         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1834         __skb_queue_tail(&entry->skb_list, rx->skb);
1835         entry->last_frag = frag;
1836         entry->extra_len += rx->skb->len;
1837         if (ieee80211_has_morefrags(fc)) {
1838                 rx->skb = NULL;
1839                 return RX_QUEUED;
1840         }
1841
1842         rx->skb = __skb_dequeue(&entry->skb_list);
1843         if (skb_tailroom(rx->skb) < entry->extra_len) {
1844                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1845                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1846                                               GFP_ATOMIC))) {
1847                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1848                         __skb_queue_purge(&entry->skb_list);
1849                         return RX_DROP_UNUSABLE;
1850                 }
1851         }
1852         while ((skb = __skb_dequeue(&entry->skb_list))) {
1853                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1854                 dev_kfree_skb(skb);
1855         }
1856
1857         /* Complete frame has been reassembled - process it now */
1858         status = IEEE80211_SKB_RXCB(rx->skb);
1859         status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1860
1861  out:
1862         ieee80211_led_rx(rx->local);
1863  out_no_led:
1864         if (rx->sta)
1865                 rx->sta->rx_packets++;
1866         return RX_CONTINUE;
1867 }
1868
1869 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1870 {
1871         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1872                 return -EACCES;
1873
1874         return 0;
1875 }
1876
1877 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1878 {
1879         struct sk_buff *skb = rx->skb;
1880         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1881
1882         /*
1883          * Pass through unencrypted frames if the hardware has
1884          * decrypted them already.
1885          */
1886         if (status->flag & RX_FLAG_DECRYPTED)
1887                 return 0;
1888
1889         /* Drop unencrypted frames if key is set. */
1890         if (unlikely(!ieee80211_has_protected(fc) &&
1891                      !ieee80211_is_nullfunc(fc) &&
1892                      ieee80211_is_data(fc) &&
1893                      (rx->key || rx->sdata->drop_unencrypted)))
1894                 return -EACCES;
1895
1896         return 0;
1897 }
1898
1899 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1900 {
1901         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1902         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1903         __le16 fc = hdr->frame_control;
1904
1905         /*
1906          * Pass through unencrypted frames if the hardware has
1907          * decrypted them already.
1908          */
1909         if (status->flag & RX_FLAG_DECRYPTED)
1910                 return 0;
1911
1912         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1913                 if (unlikely(!ieee80211_has_protected(fc) &&
1914                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1915                              rx->key)) {
1916                         if (ieee80211_is_deauth(fc) ||
1917                             ieee80211_is_disassoc(fc))
1918                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1919                                                              rx->skb->data,
1920                                                              rx->skb->len);
1921                         return -EACCES;
1922                 }
1923                 /* BIP does not use Protected field, so need to check MMIE */
1924                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1925                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1926                         if (ieee80211_is_deauth(fc) ||
1927                             ieee80211_is_disassoc(fc))
1928                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1929                                                              rx->skb->data,
1930                                                              rx->skb->len);
1931                         return -EACCES;
1932                 }
1933                 /*
1934                  * When using MFP, Action frames are not allowed prior to
1935                  * having configured keys.
1936                  */
1937                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1938                              ieee80211_is_robust_mgmt_frame(rx->skb)))
1939                         return -EACCES;
1940         }
1941
1942         return 0;
1943 }
1944
1945 static int
1946 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1947 {
1948         struct ieee80211_sub_if_data *sdata = rx->sdata;
1949         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1950         bool check_port_control = false;
1951         struct ethhdr *ehdr;
1952         int ret;
1953
1954         *port_control = false;
1955         if (ieee80211_has_a4(hdr->frame_control) &&
1956             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1957                 return -1;
1958
1959         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1960             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1961
1962                 if (!sdata->u.mgd.use_4addr)
1963                         return -1;
1964                 else
1965                         check_port_control = true;
1966         }
1967
1968         if (is_multicast_ether_addr(hdr->addr1) &&
1969             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1970                 return -1;
1971
1972         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1973         if (ret < 0)
1974                 return ret;
1975
1976         ehdr = (struct ethhdr *) rx->skb->data;
1977         if (ehdr->h_proto == rx->sdata->control_port_protocol)
1978                 *port_control = true;
1979         else if (check_port_control)
1980                 return -1;
1981
1982         return 0;
1983 }
1984
1985 /*
1986  * requires that rx->skb is a frame with ethernet header
1987  */
1988 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1989 {
1990         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1991                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1992         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1993
1994         /*
1995          * Allow EAPOL frames to us/the PAE group address regardless
1996          * of whether the frame was encrypted or not.
1997          */
1998         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1999             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2000              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2001                 return true;
2002
2003         if (ieee80211_802_1x_port_control(rx) ||
2004             ieee80211_drop_unencrypted(rx, fc))
2005                 return false;
2006
2007         return true;
2008 }
2009
2010 /*
2011  * requires that rx->skb is a frame with ethernet header
2012  */
2013 static void
2014 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2015 {
2016         struct ieee80211_sub_if_data *sdata = rx->sdata;
2017         struct net_device *dev = sdata->dev;
2018         struct sk_buff *skb, *xmit_skb;
2019         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2020         struct sta_info *dsta;
2021         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2022
2023         skb = rx->skb;
2024         xmit_skb = NULL;
2025
2026         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2027              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2028             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2029             (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
2030             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2031                 if (is_multicast_ether_addr(ehdr->h_dest)) {
2032                         /*
2033                          * send multicast frames both to higher layers in
2034                          * local net stack and back to the wireless medium
2035                          */
2036                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2037                         if (!xmit_skb)
2038                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2039                                                     dev->name);
2040                 } else {
2041                         dsta = sta_info_get(sdata, skb->data);
2042                         if (dsta) {
2043                                 /*
2044                                  * The destination station is associated to
2045                                  * this AP (in this VLAN), so send the frame
2046                                  * directly to it and do not pass it to local
2047                                  * net stack.
2048                                  */
2049                                 xmit_skb = skb;
2050                                 skb = NULL;
2051                         }
2052                 }
2053         }
2054
2055 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2056         if (skb) {
2057                 /* 'align' will only take the values 0 or 2 here since all
2058                  * frames are required to be aligned to 2-byte boundaries
2059                  * when being passed to mac80211; the code here works just
2060                  * as well if that isn't true, but mac80211 assumes it can
2061                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2062                  */
2063                 int align;
2064
2065                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2066                 if (align) {
2067                         if (WARN_ON(skb_headroom(skb) < 3)) {
2068                                 dev_kfree_skb(skb);
2069                                 skb = NULL;
2070                         } else {
2071                                 u8 *data = skb->data;
2072                                 size_t len = skb_headlen(skb);
2073                                 skb->data -= align;
2074                                 memmove(skb->data, data, len);
2075                                 skb_set_tail_pointer(skb, len);
2076                         }
2077                 }
2078         }
2079 #endif
2080
2081         if (skb) {
2082                 /* deliver to local stack */
2083                 skb->protocol = eth_type_trans(skb, dev);
2084                 memset(skb->cb, 0, sizeof(skb->cb));
2085                 if (rx->local->napi)
2086                         napi_gro_receive(rx->local->napi, skb);
2087                 else
2088                         netif_receive_skb(skb);
2089         }
2090
2091         if (xmit_skb) {
2092                 /*
2093                  * Send to wireless media and increase priority by 256 to
2094                  * keep the received priority instead of reclassifying
2095                  * the frame (see cfg80211_classify8021d).
2096                  */
2097                 xmit_skb->priority += 256;
2098                 xmit_skb->protocol = htons(ETH_P_802_3);
2099                 skb_reset_network_header(xmit_skb);
2100                 skb_reset_mac_header(xmit_skb);
2101                 dev_queue_xmit(xmit_skb);
2102         }
2103 }
2104
2105 static ieee80211_rx_result debug_noinline
2106 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2107 {
2108         struct net_device *dev = rx->sdata->dev;
2109         struct sk_buff *skb = rx->skb;
2110         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2111         __le16 fc = hdr->frame_control;
2112         struct sk_buff_head frame_list;
2113         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2114
2115         if (unlikely(!ieee80211_is_data(fc)))
2116                 return RX_CONTINUE;
2117
2118         if (unlikely(!ieee80211_is_data_present(fc)))
2119                 return RX_DROP_MONITOR;
2120
2121         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2122                 return RX_CONTINUE;
2123
2124         if (ieee80211_has_a4(hdr->frame_control) &&
2125             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2126             !rx->sdata->u.vlan.sta)
2127                 return RX_DROP_UNUSABLE;
2128
2129         if (is_multicast_ether_addr(hdr->addr1) &&
2130             ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2131               rx->sdata->u.vlan.sta) ||
2132              (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2133               rx->sdata->u.mgd.use_4addr)))
2134                 return RX_DROP_UNUSABLE;
2135
2136         skb->dev = dev;
2137         __skb_queue_head_init(&frame_list);
2138
2139         if (skb_linearize(skb))
2140                 return RX_DROP_UNUSABLE;
2141
2142         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2143                                  rx->sdata->vif.type,
2144                                  rx->local->hw.extra_tx_headroom, true);
2145
2146         while (!skb_queue_empty(&frame_list)) {
2147                 rx->skb = __skb_dequeue(&frame_list);
2148
2149                 if (!ieee80211_frame_allowed(rx, fc)) {
2150                         dev_kfree_skb(rx->skb);
2151                         continue;
2152                 }
2153                 dev->stats.rx_packets++;
2154                 dev->stats.rx_bytes += rx->skb->len;
2155
2156                 ieee80211_deliver_skb(rx);
2157         }
2158
2159         return RX_QUEUED;
2160 }
2161
2162 #ifdef CONFIG_MAC80211_MESH
2163 static ieee80211_rx_result
2164 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2165 {
2166         struct ieee80211_hdr *fwd_hdr, *hdr;
2167         struct ieee80211_tx_info *info;
2168         struct ieee80211s_hdr *mesh_hdr;
2169         struct sk_buff *skb = rx->skb, *fwd_skb;
2170         struct ieee80211_local *local = rx->local;
2171         struct ieee80211_sub_if_data *sdata = rx->sdata;
2172         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2173         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2174         u16 q, hdrlen;
2175
2176         hdr = (struct ieee80211_hdr *) skb->data;
2177         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2178
2179         /* make sure fixed part of mesh header is there, also checks skb len */
2180         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2181                 return RX_DROP_MONITOR;
2182
2183         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2184
2185         /* make sure full mesh header is there, also checks skb len */
2186         if (!pskb_may_pull(rx->skb,
2187                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2188                 return RX_DROP_MONITOR;
2189
2190         /* reload pointers */
2191         hdr = (struct ieee80211_hdr *) skb->data;
2192         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2193
2194         /* frame is in RMC, don't forward */
2195         if (ieee80211_is_data(hdr->frame_control) &&
2196             is_multicast_ether_addr(hdr->addr1) &&
2197             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2198                 return RX_DROP_MONITOR;
2199
2200         if (!ieee80211_is_data(hdr->frame_control) ||
2201             !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2202                 return RX_CONTINUE;
2203
2204         if (!mesh_hdr->ttl)
2205                 return RX_DROP_MONITOR;
2206
2207         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2208                 struct mesh_path *mppath;
2209                 char *proxied_addr;
2210                 char *mpp_addr;
2211
2212                 if (is_multicast_ether_addr(hdr->addr1)) {
2213                         mpp_addr = hdr->addr3;
2214                         proxied_addr = mesh_hdr->eaddr1;
2215                 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2216                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2217                         mpp_addr = hdr->addr4;
2218                         proxied_addr = mesh_hdr->eaddr2;
2219                 } else {
2220                         return RX_DROP_MONITOR;
2221                 }
2222
2223                 rcu_read_lock();
2224                 mppath = mpp_path_lookup(sdata, proxied_addr);
2225                 if (!mppath) {
2226                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2227                 } else {
2228                         spin_lock_bh(&mppath->state_lock);
2229                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2230                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2231                         spin_unlock_bh(&mppath->state_lock);
2232                 }
2233                 rcu_read_unlock();
2234         }
2235
2236         /* Frame has reached destination.  Don't forward */
2237         if (!is_multicast_ether_addr(hdr->addr1) &&
2238             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2239                 return RX_CONTINUE;
2240
2241         q = ieee80211_select_queue_80211(sdata, skb, hdr);
2242         if (ieee80211_queue_stopped(&local->hw, q)) {
2243                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2244                 return RX_DROP_MONITOR;
2245         }
2246         skb_set_queue_mapping(skb, q);
2247
2248         if (!--mesh_hdr->ttl) {
2249                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2250                 goto out;
2251         }
2252
2253         if (!ifmsh->mshcfg.dot11MeshForwarding)
2254                 goto out;
2255
2256         fwd_skb = skb_copy(skb, GFP_ATOMIC);
2257         if (!fwd_skb) {
2258                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2259                                     sdata->name);
2260                 goto out;
2261         }
2262
2263         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2264         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2265         info = IEEE80211_SKB_CB(fwd_skb);
2266         memset(info, 0, sizeof(*info));
2267         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2268         info->control.vif = &rx->sdata->vif;
2269         info->control.jiffies = jiffies;
2270         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2271                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2272                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2273                 /* update power mode indication when forwarding */
2274                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2275         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2276                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2277                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2278         } else {
2279                 /* unable to resolve next hop */
2280                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2281                                    fwd_hdr->addr3, 0,
2282                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2283                                    fwd_hdr->addr2);
2284                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2285                 kfree_skb(fwd_skb);
2286                 return RX_DROP_MONITOR;
2287         }
2288
2289         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2290         ieee80211_add_pending_skb(local, fwd_skb);
2291  out:
2292         if (is_multicast_ether_addr(hdr->addr1) ||
2293             sdata->dev->flags & IFF_PROMISC)
2294                 return RX_CONTINUE;
2295         else
2296                 return RX_DROP_MONITOR;
2297 }
2298 #endif
2299
2300 static ieee80211_rx_result debug_noinline
2301 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2302 {
2303         struct ieee80211_sub_if_data *sdata = rx->sdata;
2304         struct ieee80211_local *local = rx->local;
2305         struct net_device *dev = sdata->dev;
2306         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2307         __le16 fc = hdr->frame_control;
2308         bool port_control;
2309         int err;
2310
2311         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2312                 return RX_CONTINUE;
2313
2314         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2315                 return RX_DROP_MONITOR;
2316
2317         /*
2318          * Send unexpected-4addr-frame event to hostapd. For older versions,
2319          * also drop the frame to cooked monitor interfaces.
2320          */
2321         if (ieee80211_has_a4(hdr->frame_control) &&
2322             sdata->vif.type == NL80211_IFTYPE_AP) {
2323                 if (rx->sta &&
2324                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2325                         cfg80211_rx_unexpected_4addr_frame(
2326                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2327                 return RX_DROP_MONITOR;
2328         }
2329
2330         err = __ieee80211_data_to_8023(rx, &port_control);
2331         if (unlikely(err))
2332                 return RX_DROP_UNUSABLE;
2333
2334         if (!ieee80211_frame_allowed(rx, fc))
2335                 return RX_DROP_MONITOR;
2336
2337         /* directly handle TDLS channel switch requests/responses */
2338         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2339                                                 cpu_to_be16(ETH_P_TDLS))) {
2340                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2341
2342                 if (pskb_may_pull(rx->skb,
2343                                   offsetof(struct ieee80211_tdls_data, u)) &&
2344                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2345                     tf->category == WLAN_CATEGORY_TDLS &&
2346                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2347                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2348                         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TDLS_CHSW;
2349                         skb_queue_tail(&sdata->skb_queue, rx->skb);
2350                         ieee80211_queue_work(&rx->local->hw, &sdata->work);
2351                         if (rx->sta)
2352                                 rx->sta->rx_packets++;
2353
2354                         return RX_QUEUED;
2355                 }
2356         }
2357
2358         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2359             unlikely(port_control) && sdata->bss) {
2360                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2361                                      u.ap);
2362                 dev = sdata->dev;
2363                 rx->sdata = sdata;
2364         }
2365
2366         rx->skb->dev = dev;
2367
2368         dev->stats.rx_packets++;
2369         dev->stats.rx_bytes += rx->skb->len;
2370
2371         if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2372             !is_multicast_ether_addr(
2373                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2374             (!local->scanning &&
2375              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2376                         mod_timer(&local->dynamic_ps_timer, jiffies +
2377                          msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2378         }
2379
2380         ieee80211_deliver_skb(rx);
2381
2382         return RX_QUEUED;
2383 }
2384
2385 static ieee80211_rx_result debug_noinline
2386 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2387 {
2388         struct sk_buff *skb = rx->skb;
2389         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2390         struct tid_ampdu_rx *tid_agg_rx;
2391         u16 start_seq_num;
2392         u16 tid;
2393
2394         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2395                 return RX_CONTINUE;
2396
2397         if (ieee80211_is_back_req(bar->frame_control)) {
2398                 struct {
2399                         __le16 control, start_seq_num;
2400                 } __packed bar_data;
2401
2402                 if (!rx->sta)
2403                         return RX_DROP_MONITOR;
2404
2405                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2406                                   &bar_data, sizeof(bar_data)))
2407                         return RX_DROP_MONITOR;
2408
2409                 tid = le16_to_cpu(bar_data.control) >> 12;
2410
2411                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2412                 if (!tid_agg_rx)
2413                         return RX_DROP_MONITOR;
2414
2415                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2416
2417                 /* reset session timer */
2418                 if (tid_agg_rx->timeout)
2419                         mod_timer(&tid_agg_rx->session_timer,
2420                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2421
2422                 spin_lock(&tid_agg_rx->reorder_lock);
2423                 /* release stored frames up to start of BAR */
2424                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2425                                                  start_seq_num, frames);
2426                 spin_unlock(&tid_agg_rx->reorder_lock);
2427
2428                 kfree_skb(skb);
2429                 return RX_QUEUED;
2430         }
2431
2432         /*
2433          * After this point, we only want management frames,
2434          * so we can drop all remaining control frames to
2435          * cooked monitor interfaces.
2436          */
2437         return RX_DROP_MONITOR;
2438 }
2439
2440 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2441                                            struct ieee80211_mgmt *mgmt,
2442                                            size_t len)
2443 {
2444         struct ieee80211_local *local = sdata->local;
2445         struct sk_buff *skb;
2446         struct ieee80211_mgmt *resp;
2447
2448         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2449                 /* Not to own unicast address */
2450                 return;
2451         }
2452
2453         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2454             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2455                 /* Not from the current AP or not associated yet. */
2456                 return;
2457         }
2458
2459         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2460                 /* Too short SA Query request frame */
2461                 return;
2462         }
2463
2464         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2465         if (skb == NULL)
2466                 return;
2467
2468         skb_reserve(skb, local->hw.extra_tx_headroom);
2469         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2470         memset(resp, 0, 24);
2471         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2472         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2473         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2474         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2475                                           IEEE80211_STYPE_ACTION);
2476         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2477         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2478         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2479         memcpy(resp->u.action.u.sa_query.trans_id,
2480                mgmt->u.action.u.sa_query.trans_id,
2481                WLAN_SA_QUERY_TR_ID_LEN);
2482
2483         ieee80211_tx_skb(sdata, skb);
2484 }
2485
2486 static ieee80211_rx_result debug_noinline
2487 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2488 {
2489         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2490         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2491
2492         /*
2493          * From here on, look only at management frames.
2494          * Data and control frames are already handled,
2495          * and unknown (reserved) frames are useless.
2496          */
2497         if (rx->skb->len < 24)
2498                 return RX_DROP_MONITOR;
2499
2500         if (!ieee80211_is_mgmt(mgmt->frame_control))
2501                 return RX_DROP_MONITOR;
2502
2503         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2504             ieee80211_is_beacon(mgmt->frame_control) &&
2505             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2506                 int sig = 0;
2507
2508                 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2509                         sig = status->signal;
2510
2511                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2512                                             rx->skb->data, rx->skb->len,
2513                                             status->freq, sig);
2514                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2515         }
2516
2517         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2518                 return RX_DROP_MONITOR;
2519
2520         if (ieee80211_drop_unencrypted_mgmt(rx))
2521                 return RX_DROP_UNUSABLE;
2522
2523         return RX_CONTINUE;
2524 }
2525
2526 static ieee80211_rx_result debug_noinline
2527 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2528 {
2529         struct ieee80211_local *local = rx->local;
2530         struct ieee80211_sub_if_data *sdata = rx->sdata;
2531         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2532         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2533         int len = rx->skb->len;
2534
2535         if (!ieee80211_is_action(mgmt->frame_control))
2536                 return RX_CONTINUE;
2537
2538         /* drop too small frames */
2539         if (len < IEEE80211_MIN_ACTION_SIZE)
2540                 return RX_DROP_UNUSABLE;
2541
2542         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2543             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2544             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2545                 return RX_DROP_UNUSABLE;
2546
2547         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2548                 return RX_DROP_UNUSABLE;
2549
2550         switch (mgmt->u.action.category) {
2551         case WLAN_CATEGORY_HT:
2552                 /* reject HT action frames from stations not supporting HT */
2553                 if (!rx->sta->sta.ht_cap.ht_supported)
2554                         goto invalid;
2555
2556                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2557                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2558                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2559                     sdata->vif.type != NL80211_IFTYPE_AP &&
2560                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2561                         break;
2562
2563                 /* verify action & smps_control/chanwidth are present */
2564                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2565                         goto invalid;
2566
2567                 switch (mgmt->u.action.u.ht_smps.action) {
2568                 case WLAN_HT_ACTION_SMPS: {
2569                         struct ieee80211_supported_band *sband;
2570                         enum ieee80211_smps_mode smps_mode;
2571
2572                         /* convert to HT capability */
2573                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2574                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2575                                 smps_mode = IEEE80211_SMPS_OFF;
2576                                 break;
2577                         case WLAN_HT_SMPS_CONTROL_STATIC:
2578                                 smps_mode = IEEE80211_SMPS_STATIC;
2579                                 break;
2580                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2581                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2582                                 break;
2583                         default:
2584                                 goto invalid;
2585                         }
2586
2587                         /* if no change do nothing */
2588                         if (rx->sta->sta.smps_mode == smps_mode)
2589                                 goto handled;
2590                         rx->sta->sta.smps_mode = smps_mode;
2591
2592                         sband = rx->local->hw.wiphy->bands[status->band];
2593
2594                         rate_control_rate_update(local, sband, rx->sta,
2595                                                  IEEE80211_RC_SMPS_CHANGED);
2596                         goto handled;
2597                 }
2598                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2599                         struct ieee80211_supported_band *sband;
2600                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2601                         enum ieee80211_sta_rx_bandwidth new_bw;
2602
2603                         /* If it doesn't support 40 MHz it can't change ... */
2604                         if (!(rx->sta->sta.ht_cap.cap &
2605                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2606                                 goto handled;
2607
2608                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2609                                 new_bw = IEEE80211_STA_RX_BW_20;
2610                         else
2611                                 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2612
2613                         if (rx->sta->sta.bandwidth == new_bw)
2614                                 goto handled;
2615
2616                         sband = rx->local->hw.wiphy->bands[status->band];
2617
2618                         rate_control_rate_update(local, sband, rx->sta,
2619                                                  IEEE80211_RC_BW_CHANGED);
2620                         goto handled;
2621                 }
2622                 default:
2623                         goto invalid;
2624                 }
2625
2626                 break;
2627         case WLAN_CATEGORY_PUBLIC:
2628                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2629                         goto invalid;
2630                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2631                         break;
2632                 if (!rx->sta)
2633                         break;
2634                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2635                         break;
2636                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2637                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2638                         break;
2639                 if (len < offsetof(struct ieee80211_mgmt,
2640                                    u.action.u.ext_chan_switch.variable))
2641                         goto invalid;
2642                 goto queue;
2643         case WLAN_CATEGORY_VHT:
2644                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2645                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2646                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2647                     sdata->vif.type != NL80211_IFTYPE_AP &&
2648                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2649                         break;
2650
2651                 /* verify action code is present */
2652                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2653                         goto invalid;
2654
2655                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2656                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2657                         u8 opmode;
2658
2659                         /* verify opmode is present */
2660                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2661                                 goto invalid;
2662
2663                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2664
2665                         ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2666                                                     opmode, status->band,
2667                                                     false);
2668                         goto handled;
2669                 }
2670                 default:
2671                         break;
2672                 }
2673                 break;
2674         case WLAN_CATEGORY_BACK:
2675                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2676                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2677                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2678                     sdata->vif.type != NL80211_IFTYPE_AP &&
2679                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2680                         break;
2681
2682                 /* verify action_code is present */
2683                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2684                         break;
2685
2686                 switch (mgmt->u.action.u.addba_req.action_code) {
2687                 case WLAN_ACTION_ADDBA_REQ:
2688                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2689                                    sizeof(mgmt->u.action.u.addba_req)))
2690                                 goto invalid;
2691                         break;
2692                 case WLAN_ACTION_ADDBA_RESP:
2693                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2694                                    sizeof(mgmt->u.action.u.addba_resp)))
2695                                 goto invalid;
2696                         break;
2697                 case WLAN_ACTION_DELBA:
2698                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2699                                    sizeof(mgmt->u.action.u.delba)))
2700                                 goto invalid;
2701                         break;
2702                 default:
2703                         goto invalid;
2704                 }
2705
2706                 goto queue;
2707         case WLAN_CATEGORY_SPECTRUM_MGMT:
2708                 /* verify action_code is present */
2709                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2710                         break;
2711
2712                 switch (mgmt->u.action.u.measurement.action_code) {
2713                 case WLAN_ACTION_SPCT_MSR_REQ:
2714                         if (status->band != IEEE80211_BAND_5GHZ)
2715                                 break;
2716
2717                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2718                                    sizeof(mgmt->u.action.u.measurement)))
2719                                 break;
2720
2721                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2722                                 break;
2723
2724                         ieee80211_process_measurement_req(sdata, mgmt, len);
2725                         goto handled;
2726                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2727                         u8 *bssid;
2728                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2729                                    sizeof(mgmt->u.action.u.chan_switch)))
2730                                 break;
2731
2732                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2733                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2734                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2735                                 break;
2736
2737                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2738                                 bssid = sdata->u.mgd.bssid;
2739                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2740                                 bssid = sdata->u.ibss.bssid;
2741                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2742                                 bssid = mgmt->sa;
2743                         else
2744                                 break;
2745
2746                         if (!ether_addr_equal(mgmt->bssid, bssid))
2747                                 break;
2748
2749                         goto queue;
2750                         }
2751                 }
2752                 break;
2753         case WLAN_CATEGORY_SA_QUERY:
2754                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2755                            sizeof(mgmt->u.action.u.sa_query)))
2756                         break;
2757
2758                 switch (mgmt->u.action.u.sa_query.action) {
2759                 case WLAN_ACTION_SA_QUERY_REQUEST:
2760                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2761                                 break;
2762                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2763                         goto handled;
2764                 }
2765                 break;
2766         case WLAN_CATEGORY_SELF_PROTECTED:
2767                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2768                            sizeof(mgmt->u.action.u.self_prot.action_code)))
2769                         break;
2770
2771                 switch (mgmt->u.action.u.self_prot.action_code) {
2772                 case WLAN_SP_MESH_PEERING_OPEN:
2773                 case WLAN_SP_MESH_PEERING_CLOSE:
2774                 case WLAN_SP_MESH_PEERING_CONFIRM:
2775                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2776                                 goto invalid;
2777                         if (sdata->u.mesh.user_mpm)
2778                                 /* userspace handles this frame */
2779                                 break;
2780                         goto queue;
2781                 case WLAN_SP_MGK_INFORM:
2782                 case WLAN_SP_MGK_ACK:
2783                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2784                                 goto invalid;
2785                         break;
2786                 }
2787                 break;
2788         case WLAN_CATEGORY_MESH_ACTION:
2789                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2790                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
2791                         break;
2792
2793                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2794                         break;
2795                 if (mesh_action_is_path_sel(mgmt) &&
2796                     !mesh_path_sel_is_hwmp(sdata))
2797                         break;
2798                 goto queue;
2799         }
2800
2801         return RX_CONTINUE;
2802
2803  invalid:
2804         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2805         /* will return in the next handlers */
2806         return RX_CONTINUE;
2807
2808  handled:
2809         if (rx->sta)
2810                 rx->sta->rx_packets++;
2811         dev_kfree_skb(rx->skb);
2812         return RX_QUEUED;
2813
2814  queue:
2815         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2816         skb_queue_tail(&sdata->skb_queue, rx->skb);
2817         ieee80211_queue_work(&local->hw, &sdata->work);
2818         if (rx->sta)
2819                 rx->sta->rx_packets++;
2820         return RX_QUEUED;
2821 }
2822
2823 static ieee80211_rx_result debug_noinline
2824 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2825 {
2826         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2827         int sig = 0;
2828
2829         /* skip known-bad action frames and return them in the next handler */
2830         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2831                 return RX_CONTINUE;
2832
2833         /*
2834          * Getting here means the kernel doesn't know how to handle
2835          * it, but maybe userspace does ... include returned frames
2836          * so userspace can register for those to know whether ones
2837          * it transmitted were processed or returned.
2838          */
2839
2840         if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2841                 sig = status->signal;
2842
2843         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2844                              rx->skb->data, rx->skb->len, 0)) {
2845                 if (rx->sta)
2846                         rx->sta->rx_packets++;
2847                 dev_kfree_skb(rx->skb);
2848                 return RX_QUEUED;
2849         }
2850
2851         return RX_CONTINUE;
2852 }
2853
2854 static ieee80211_rx_result debug_noinline
2855 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2856 {
2857         struct ieee80211_local *local = rx->local;
2858         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2859         struct sk_buff *nskb;
2860         struct ieee80211_sub_if_data *sdata = rx->sdata;
2861         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2862
2863         if (!ieee80211_is_action(mgmt->frame_control))
2864                 return RX_CONTINUE;
2865
2866         /*
2867          * For AP mode, hostapd is responsible for handling any action
2868          * frames that we didn't handle, including returning unknown
2869          * ones. For all other modes we will return them to the sender,
2870          * setting the 0x80 bit in the action category, as required by
2871          * 802.11-2012 9.24.4.
2872          * Newer versions of hostapd shall also use the management frame
2873          * registration mechanisms, but older ones still use cooked
2874          * monitor interfaces so push all frames there.
2875          */
2876         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2877             (sdata->vif.type == NL80211_IFTYPE_AP ||
2878              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2879                 return RX_DROP_MONITOR;
2880
2881         if (is_multicast_ether_addr(mgmt->da))
2882                 return RX_DROP_MONITOR;
2883
2884         /* do not return rejected action frames */
2885         if (mgmt->u.action.category & 0x80)
2886                 return RX_DROP_UNUSABLE;
2887
2888         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2889                                GFP_ATOMIC);
2890         if (nskb) {
2891                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2892
2893                 nmgmt->u.action.category |= 0x80;
2894                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2895                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2896
2897                 memset(nskb->cb, 0, sizeof(nskb->cb));
2898
2899                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2900                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2901
2902                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2903                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2904                                       IEEE80211_TX_CTL_NO_CCK_RATE;
2905                         if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2906                                 info->hw_queue =
2907                                         local->hw.offchannel_tx_hw_queue;
2908                 }
2909
2910                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2911                                             status->band);
2912         }
2913         dev_kfree_skb(rx->skb);
2914         return RX_QUEUED;
2915 }
2916
2917 static ieee80211_rx_result debug_noinline
2918 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2919 {
2920         struct ieee80211_sub_if_data *sdata = rx->sdata;
2921         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2922         __le16 stype;
2923
2924         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2925
2926         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2927             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2928             sdata->vif.type != NL80211_IFTYPE_OCB &&
2929             sdata->vif.type != NL80211_IFTYPE_STATION)
2930                 return RX_DROP_MONITOR;
2931
2932         switch (stype) {
2933         case cpu_to_le16(IEEE80211_STYPE_AUTH):
2934         case cpu_to_le16(IEEE80211_STYPE_BEACON):
2935         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2936                 /* process for all: mesh, mlme, ibss */
2937                 break;
2938         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2939         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2940         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2941         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2942                 if (is_multicast_ether_addr(mgmt->da) &&
2943                     !is_broadcast_ether_addr(mgmt->da))
2944                         return RX_DROP_MONITOR;
2945
2946                 /* process only for station */
2947                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2948                         return RX_DROP_MONITOR;
2949                 break;
2950         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2951                 /* process only for ibss and mesh */
2952                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2953                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2954                         return RX_DROP_MONITOR;
2955                 break;
2956         default:
2957                 return RX_DROP_MONITOR;
2958         }
2959
2960         /* queue up frame and kick off work to process it */
2961         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2962         skb_queue_tail(&sdata->skb_queue, rx->skb);
2963         ieee80211_queue_work(&rx->local->hw, &sdata->work);
2964         if (rx->sta)
2965                 rx->sta->rx_packets++;
2966
2967         return RX_QUEUED;
2968 }
2969
2970 /* TODO: use IEEE80211_RX_FRAGMENTED */
2971 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2972                                         struct ieee80211_rate *rate)
2973 {
2974         struct ieee80211_sub_if_data *sdata;
2975         struct ieee80211_local *local = rx->local;
2976         struct sk_buff *skb = rx->skb, *skb2;
2977         struct net_device *prev_dev = NULL;
2978         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2979         int needed_headroom;
2980
2981         /*
2982          * If cooked monitor has been processed already, then
2983          * don't do it again. If not, set the flag.
2984          */
2985         if (rx->flags & IEEE80211_RX_CMNTR)
2986                 goto out_free_skb;
2987         rx->flags |= IEEE80211_RX_CMNTR;
2988
2989         /* If there are no cooked monitor interfaces, just free the SKB */
2990         if (!local->cooked_mntrs)
2991                 goto out_free_skb;
2992
2993         /* vendor data is long removed here */
2994         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
2995         /* room for the radiotap header based on driver features */
2996         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
2997
2998         if (skb_headroom(skb) < needed_headroom &&
2999             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3000                 goto out_free_skb;
3001
3002         /* prepend radiotap information */
3003         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3004                                          false);
3005
3006         skb_set_mac_header(skb, 0);
3007         skb->ip_summed = CHECKSUM_UNNECESSARY;
3008         skb->pkt_type = PACKET_OTHERHOST;
3009         skb->protocol = htons(ETH_P_802_2);
3010
3011         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3012                 if (!ieee80211_sdata_running(sdata))
3013                         continue;
3014
3015                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3016                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
3017                         continue;
3018
3019                 if (prev_dev) {
3020                         skb2 = skb_clone(skb, GFP_ATOMIC);
3021                         if (skb2) {
3022                                 skb2->dev = prev_dev;
3023                                 netif_receive_skb(skb2);
3024                         }
3025                 }
3026
3027                 prev_dev = sdata->dev;
3028                 sdata->dev->stats.rx_packets++;
3029                 sdata->dev->stats.rx_bytes += skb->len;
3030         }
3031
3032         if (prev_dev) {
3033                 skb->dev = prev_dev;
3034                 netif_receive_skb(skb);
3035                 return;
3036         }
3037
3038  out_free_skb:
3039         dev_kfree_skb(skb);
3040 }
3041
3042 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3043                                          ieee80211_rx_result res)
3044 {
3045         switch (res) {
3046         case RX_DROP_MONITOR:
3047                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3048                 if (rx->sta)
3049                         rx->sta->rx_dropped++;
3050                 /* fall through */
3051         case RX_CONTINUE: {
3052                 struct ieee80211_rate *rate = NULL;
3053                 struct ieee80211_supported_band *sband;
3054                 struct ieee80211_rx_status *status;
3055
3056                 status = IEEE80211_SKB_RXCB((rx->skb));
3057
3058                 sband = rx->local->hw.wiphy->bands[status->band];
3059                 if (!(status->flag & RX_FLAG_HT) &&
3060                     !(status->flag & RX_FLAG_VHT))
3061                         rate = &sband->bitrates[status->rate_idx];
3062
3063                 ieee80211_rx_cooked_monitor(rx, rate);
3064                 break;
3065                 }
3066         case RX_DROP_UNUSABLE:
3067                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3068                 if (rx->sta)
3069                         rx->sta->rx_dropped++;
3070                 dev_kfree_skb(rx->skb);
3071                 break;
3072         case RX_QUEUED:
3073                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3074                 break;
3075         }
3076 }
3077
3078 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3079                                   struct sk_buff_head *frames)
3080 {
3081         ieee80211_rx_result res = RX_DROP_MONITOR;
3082         struct sk_buff *skb;
3083
3084 #define CALL_RXH(rxh)                   \
3085         do {                            \
3086                 res = rxh(rx);          \
3087                 if (res != RX_CONTINUE) \
3088                         goto rxh_next;  \
3089         } while (0);
3090
3091         spin_lock_bh(&rx->local->rx_path_lock);
3092
3093         while ((skb = __skb_dequeue(frames))) {
3094                 /*
3095                  * all the other fields are valid across frames
3096                  * that belong to an aMPDU since they are on the
3097                  * same TID from the same station
3098                  */
3099                 rx->skb = skb;
3100
3101                 CALL_RXH(ieee80211_rx_h_check_more_data)
3102                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
3103                 CALL_RXH(ieee80211_rx_h_sta_process)
3104                 CALL_RXH(ieee80211_rx_h_decrypt)
3105                 CALL_RXH(ieee80211_rx_h_defragment)
3106                 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
3107                 /* must be after MMIC verify so header is counted in MPDU mic */
3108 #ifdef CONFIG_MAC80211_MESH
3109                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3110                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3111 #endif
3112                 CALL_RXH(ieee80211_rx_h_amsdu)
3113                 CALL_RXH(ieee80211_rx_h_data)
3114
3115                 /* special treatment -- needs the queue */
3116                 res = ieee80211_rx_h_ctrl(rx, frames);
3117                 if (res != RX_CONTINUE)
3118                         goto rxh_next;
3119
3120                 CALL_RXH(ieee80211_rx_h_mgmt_check)
3121                 CALL_RXH(ieee80211_rx_h_action)
3122                 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
3123                 CALL_RXH(ieee80211_rx_h_action_return)
3124                 CALL_RXH(ieee80211_rx_h_mgmt)
3125
3126  rxh_next:
3127                 ieee80211_rx_handlers_result(rx, res);
3128
3129 #undef CALL_RXH
3130         }
3131
3132         spin_unlock_bh(&rx->local->rx_path_lock);
3133 }
3134
3135 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3136 {
3137         struct sk_buff_head reorder_release;
3138         ieee80211_rx_result res = RX_DROP_MONITOR;
3139
3140         __skb_queue_head_init(&reorder_release);
3141
3142 #define CALL_RXH(rxh)                   \
3143         do {                            \
3144                 res = rxh(rx);          \
3145                 if (res != RX_CONTINUE) \
3146                         goto rxh_next;  \
3147         } while (0);
3148
3149         CALL_RXH(ieee80211_rx_h_check_dup)
3150         CALL_RXH(ieee80211_rx_h_check)
3151
3152         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3153
3154         ieee80211_rx_handlers(rx, &reorder_release);
3155         return;
3156
3157  rxh_next:
3158         ieee80211_rx_handlers_result(rx, res);
3159
3160 #undef CALL_RXH
3161 }
3162
3163 /*
3164  * This function makes calls into the RX path, therefore
3165  * it has to be invoked under RCU read lock.
3166  */
3167 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3168 {
3169         struct sk_buff_head frames;
3170         struct ieee80211_rx_data rx = {
3171                 .sta = sta,
3172                 .sdata = sta->sdata,
3173                 .local = sta->local,
3174                 /* This is OK -- must be QoS data frame */
3175                 .security_idx = tid,
3176                 .seqno_idx = tid,
3177                 .flags = 0,
3178         };
3179         struct tid_ampdu_rx *tid_agg_rx;
3180
3181         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3182         if (!tid_agg_rx)
3183                 return;
3184
3185         __skb_queue_head_init(&frames);
3186
3187         spin_lock(&tid_agg_rx->reorder_lock);
3188         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3189         spin_unlock(&tid_agg_rx->reorder_lock);
3190
3191         ieee80211_rx_handlers(&rx, &frames);
3192 }
3193
3194 /* main receive path */
3195
3196 static bool prepare_for_handlers(struct ieee80211_rx_data *rx,
3197                                  struct ieee80211_hdr *hdr)
3198 {
3199         struct ieee80211_sub_if_data *sdata = rx->sdata;
3200         struct sk_buff *skb = rx->skb;
3201         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3202         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3203         int multicast = is_multicast_ether_addr(hdr->addr1);
3204
3205         switch (sdata->vif.type) {
3206         case NL80211_IFTYPE_STATION:
3207                 if (!bssid && !sdata->u.mgd.use_4addr)
3208                         return false;
3209                 if (!multicast &&
3210                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3211                         if (!(sdata->dev->flags & IFF_PROMISC) ||
3212                             sdata->u.mgd.use_4addr)
3213                                 return false;
3214                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3215                 }
3216                 break;
3217         case NL80211_IFTYPE_ADHOC:
3218                 if (!bssid)
3219                         return false;
3220                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3221                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3222                         return false;
3223                 if (ieee80211_is_beacon(hdr->frame_control)) {
3224                         return true;
3225                 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3226                         return false;
3227                 } else if (!multicast &&
3228                            !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3229                         if (!(sdata->dev->flags & IFF_PROMISC))
3230                                 return false;
3231                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3232                 } else if (!rx->sta) {
3233                         int rate_idx;
3234                         if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3235                                 rate_idx = 0; /* TODO: HT/VHT rates */
3236                         else
3237                                 rate_idx = status->rate_idx;
3238                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3239                                                  BIT(rate_idx));
3240                 }
3241                 break;
3242         case NL80211_IFTYPE_OCB:
3243                 if (!bssid)
3244                         return false;
3245                 if (ieee80211_is_beacon(hdr->frame_control)) {
3246                         return false;
3247                 } else if (!is_broadcast_ether_addr(bssid)) {
3248                         ocb_dbg(sdata, "BSSID mismatch in OCB mode!\n");
3249                         return false;
3250                 } else if (!multicast &&
3251                            !ether_addr_equal(sdata->dev->dev_addr,
3252                                              hdr->addr1)) {
3253                         /* if we are in promisc mode we also accept
3254                          * packets not destined for us
3255                          */
3256                         if (!(sdata->dev->flags & IFF_PROMISC))
3257                                 return false;
3258                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
3259                 } else if (!rx->sta) {
3260                         int rate_idx;
3261                         if (status->flag & RX_FLAG_HT)
3262                                 rate_idx = 0; /* TODO: HT rates */
3263                         else
3264                                 rate_idx = status->rate_idx;
3265                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3266                                                 BIT(rate_idx));
3267                 }
3268                 break;
3269         case NL80211_IFTYPE_MESH_POINT:
3270                 if (!multicast &&
3271                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3272                         if (!(sdata->dev->flags & IFF_PROMISC))
3273                                 return false;
3274
3275                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3276                 }
3277                 break;
3278         case NL80211_IFTYPE_AP_VLAN:
3279         case NL80211_IFTYPE_AP:
3280                 if (!bssid) {
3281                         if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3282                                 return false;
3283                 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3284                         /*
3285                          * Accept public action frames even when the
3286                          * BSSID doesn't match, this is used for P2P
3287                          * and location updates. Note that mac80211
3288                          * itself never looks at these frames.
3289                          */
3290                         if (!multicast &&
3291                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3292                                 return false;
3293                         if (ieee80211_is_public_action(hdr, skb->len))
3294                                 return true;
3295                         if (!ieee80211_is_beacon(hdr->frame_control))
3296                                 return false;
3297                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3298                 } else if (!ieee80211_has_tods(hdr->frame_control)) {
3299                         /* ignore data frames to TDLS-peers */
3300                         if (ieee80211_is_data(hdr->frame_control))
3301                                 return false;
3302                         /* ignore action frames to TDLS-peers */
3303                         if (ieee80211_is_action(hdr->frame_control) &&
3304                             !ether_addr_equal(bssid, hdr->addr1))
3305                                 return false;
3306                 }
3307                 break;
3308         case NL80211_IFTYPE_WDS:
3309                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3310                         return false;
3311                 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3312                         return false;
3313                 break;
3314         case NL80211_IFTYPE_P2P_DEVICE:
3315                 if (!ieee80211_is_public_action(hdr, skb->len) &&
3316                     !ieee80211_is_probe_req(hdr->frame_control) &&
3317                     !ieee80211_is_probe_resp(hdr->frame_control) &&
3318                     !ieee80211_is_beacon(hdr->frame_control))
3319                         return false;
3320                 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3321                     !multicast)
3322                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3323                 break;
3324         default:
3325                 /* should never get here */
3326                 WARN_ON_ONCE(1);
3327                 break;
3328         }
3329
3330         return true;
3331 }
3332
3333 /*
3334  * This function returns whether or not the SKB
3335  * was destined for RX processing or not, which,
3336  * if consume is true, is equivalent to whether
3337  * or not the skb was consumed.
3338  */
3339 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3340                                             struct sk_buff *skb, bool consume)
3341 {
3342         struct ieee80211_local *local = rx->local;
3343         struct ieee80211_sub_if_data *sdata = rx->sdata;
3344         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3345         struct ieee80211_hdr *hdr = (void *)skb->data;
3346
3347         rx->skb = skb;
3348         status->rx_flags |= IEEE80211_RX_RA_MATCH;
3349
3350         if (!prepare_for_handlers(rx, hdr))
3351                 return false;
3352
3353         if (!consume) {
3354                 skb = skb_copy(skb, GFP_ATOMIC);
3355                 if (!skb) {
3356                         if (net_ratelimit())
3357                                 wiphy_debug(local->hw.wiphy,
3358                                         "failed to copy skb for %s\n",
3359                                         sdata->name);
3360                         return true;
3361                 }
3362
3363                 rx->skb = skb;
3364         }
3365
3366         ieee80211_invoke_rx_handlers(rx);
3367         return true;
3368 }
3369
3370 /*
3371  * This is the actual Rx frames handler. as it belongs to Rx path it must
3372  * be called with rcu_read_lock protection.
3373  */
3374 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3375                                          struct sk_buff *skb)
3376 {
3377         struct ieee80211_local *local = hw_to_local(hw);
3378         struct ieee80211_sub_if_data *sdata;
3379         struct ieee80211_hdr *hdr;
3380         __le16 fc;
3381         struct ieee80211_rx_data rx;
3382         struct ieee80211_sub_if_data *prev;
3383         struct sta_info *sta, *tmp, *prev_sta;
3384         int err = 0;
3385
3386         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3387         memset(&rx, 0, sizeof(rx));
3388         rx.skb = skb;
3389         rx.local = local;
3390
3391         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3392                 local->dot11ReceivedFragmentCount++;
3393
3394         if (ieee80211_is_mgmt(fc)) {
3395                 /* drop frame if too short for header */
3396                 if (skb->len < ieee80211_hdrlen(fc))
3397                         err = -ENOBUFS;
3398                 else
3399                         err = skb_linearize(skb);
3400         } else {
3401                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3402         }
3403
3404         if (err) {
3405                 dev_kfree_skb(skb);
3406                 return;
3407         }
3408
3409         hdr = (struct ieee80211_hdr *)skb->data;
3410         ieee80211_parse_qos(&rx);
3411         ieee80211_verify_alignment(&rx);
3412
3413         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3414                      ieee80211_is_beacon(hdr->frame_control)))
3415                 ieee80211_scan_rx(local, skb);
3416
3417         if (ieee80211_is_data(fc)) {
3418                 prev_sta = NULL;
3419
3420                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
3421                         if (!prev_sta) {
3422                                 prev_sta = sta;
3423                                 continue;
3424                         }
3425
3426                         rx.sta = prev_sta;
3427                         rx.sdata = prev_sta->sdata;
3428                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
3429
3430                         prev_sta = sta;
3431                 }
3432
3433                 if (prev_sta) {
3434                         rx.sta = prev_sta;
3435                         rx.sdata = prev_sta->sdata;
3436
3437                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3438                                 return;
3439                         goto out;
3440                 }
3441         }
3442
3443         prev = NULL;
3444
3445         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3446                 if (!ieee80211_sdata_running(sdata))
3447                         continue;
3448
3449                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3450                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3451                         continue;
3452
3453                 /*
3454                  * frame is destined for this interface, but if it's
3455                  * not also for the previous one we handle that after
3456                  * the loop to avoid copying the SKB once too much
3457                  */
3458
3459                 if (!prev) {
3460                         prev = sdata;
3461                         continue;
3462                 }
3463
3464                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3465                 rx.sdata = prev;
3466                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3467
3468                 prev = sdata;
3469         }
3470
3471         if (prev) {
3472                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3473                 rx.sdata = prev;
3474
3475                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3476                         return;
3477         }
3478
3479  out:
3480         dev_kfree_skb(skb);
3481 }
3482
3483 /*
3484  * This is the receive path handler. It is called by a low level driver when an
3485  * 802.11 MPDU is received from the hardware.
3486  */
3487 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3488 {
3489         struct ieee80211_local *local = hw_to_local(hw);
3490         struct ieee80211_rate *rate = NULL;
3491         struct ieee80211_supported_band *sband;
3492         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3493
3494         WARN_ON_ONCE(softirq_count() == 0);
3495
3496         if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3497                 goto drop;
3498
3499         sband = local->hw.wiphy->bands[status->band];
3500         if (WARN_ON(!sband))
3501                 goto drop;
3502
3503         /*
3504          * If we're suspending, it is possible although not too likely
3505          * that we'd be receiving frames after having already partially
3506          * quiesced the stack. We can't process such frames then since
3507          * that might, for example, cause stations to be added or other
3508          * driver callbacks be invoked.
3509          */
3510         if (unlikely(local->quiescing || local->suspended))
3511                 goto drop;
3512
3513         /* We might be during a HW reconfig, prevent Rx for the same reason */
3514         if (unlikely(local->in_reconfig))
3515                 goto drop;
3516
3517         /*
3518          * The same happens when we're not even started,
3519          * but that's worth a warning.
3520          */
3521         if (WARN_ON(!local->started))
3522                 goto drop;
3523
3524         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3525                 /*
3526                  * Validate the rate, unless a PLCP error means that
3527                  * we probably can't have a valid rate here anyway.
3528                  */
3529
3530                 if (status->flag & RX_FLAG_HT) {
3531                         /*
3532                          * rate_idx is MCS index, which can be [0-76]
3533                          * as documented on:
3534                          *
3535                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3536                          *
3537                          * Anything else would be some sort of driver or
3538                          * hardware error. The driver should catch hardware
3539                          * errors.
3540                          */
3541                         if (WARN(status->rate_idx > 76,
3542                                  "Rate marked as an HT rate but passed "
3543                                  "status->rate_idx is not "
3544                                  "an MCS index [0-76]: %d (0x%02x)\n",
3545                                  status->rate_idx,
3546                                  status->rate_idx))
3547                                 goto drop;
3548                 } else if (status->flag & RX_FLAG_VHT) {
3549                         if (WARN_ONCE(status->rate_idx > 9 ||
3550                                       !status->vht_nss ||
3551                                       status->vht_nss > 8,
3552                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3553                                       status->rate_idx, status->vht_nss))
3554                                 goto drop;
3555                 } else {
3556                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3557                                 goto drop;
3558                         rate = &sband->bitrates[status->rate_idx];
3559                 }
3560         }
3561
3562         status->rx_flags = 0;
3563
3564         /*
3565          * key references and virtual interfaces are protected using RCU
3566          * and this requires that we are in a read-side RCU section during
3567          * receive processing
3568          */
3569         rcu_read_lock();
3570
3571         /*
3572          * Frames with failed FCS/PLCP checksum are not returned,
3573          * all other frames are returned without radiotap header
3574          * if it was previously present.
3575          * Also, frames with less than 16 bytes are dropped.
3576          */
3577         skb = ieee80211_rx_monitor(local, skb, rate);
3578         if (!skb) {
3579                 rcu_read_unlock();
3580                 return;
3581         }
3582
3583         ieee80211_tpt_led_trig_rx(local,
3584                         ((struct ieee80211_hdr *)skb->data)->frame_control,
3585                         skb->len);
3586         __ieee80211_rx_handle_packet(hw, skb);
3587
3588         rcu_read_unlock();
3589
3590         return;
3591  drop:
3592         kfree_skb(skb);
3593 }
3594 EXPORT_SYMBOL(ieee80211_rx);
3595
3596 /* This is a version of the rx handler that can be called from hard irq
3597  * context. Post the skb on the queue and schedule the tasklet */
3598 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3599 {
3600         struct ieee80211_local *local = hw_to_local(hw);
3601
3602         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3603
3604         skb->pkt_type = IEEE80211_RX_MSG;
3605         skb_queue_tail(&local->skb_queue, skb);
3606         tasklet_schedule(&local->tasklet);
3607 }
3608 EXPORT_SYMBOL(ieee80211_rx_irqsafe);