net/mac80211/rx.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2007-2010  Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/jiffies.h>
  14 #include <linux/slab.h>
  15 #include <linux/kernel.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rcupdate.h>
  20 #include <linux/export.h>
  21 #include <net/mac80211.h>
  22 #include <net/ieee80211_radiotap.h>
  23 #include <asm/unaligned.h>
  24
  25 #include "ieee80211_i.h"
  26 #include "driver-ops.h"
  27 #include "led.h"
  28 #include "mesh.h"
  29 #include "wep.h"
  30 #include "wpa.h"
  31 #include "tkip.h"
  32 #include "wme.h"
  33 #include "rate.h"
  34
  35 /*
  36  * monitor mode reception
  37  *
  38  * This function cleans up the SKB, i.e. it removes all the stuff
  39  * only useful for monitoring.
  40  */
  41 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
  42                                            struct sk_buff *skb,
  43                                            unsigned int rtap_vendor_space)
  44 {
  45         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
  46                 if (likely(skb->len > FCS_LEN))
  47                         __pskb_trim(skb, skb->len - FCS_LEN);
  48                 else {
  49                         /* driver bug */
  50                         WARN_ON(1);
  51                         dev_kfree_skb(skb);
  52                         return NULL;
  53                 }
  54         }
  55
  56         __pskb_pull(skb, rtap_vendor_space);
  57
  58         return skb;
  59 }
  60
  61 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
  62                                      unsigned int rtap_vendor_space)
  63 {
  64         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
  65         struct ieee80211_hdr *hdr;
  66
  67         hdr = (void *)(skb->data + rtap_vendor_space);
  68
  69         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
  70                             RX_FLAG_FAILED_PLCP_CRC |
  71                             RX_FLAG_AMPDU_IS_ZEROLEN))
  72                 return true;
  73
  74         if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
  75                 return true;
  76
  77         if (ieee80211_is_ctl(hdr->frame_control) &&
  78             !ieee80211_is_pspoll(hdr->frame_control) &&
  79             !ieee80211_is_back_req(hdr->frame_control))
  80                 return true;
  81
  82         return false;
  83 }
  84
  85 static int
  86 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
  87                              struct ieee80211_rx_status *status,
  88                              struct sk_buff *skb)
  89 {
  90         int len;
  91
  92         /* always present fields */
  93         len = sizeof(struct ieee80211_radiotap_header) + 8;
  94
  95         /* allocate extra bitmaps */
  96         if (status->chains)
  97                 len += 4 * hweight8(status->chains);
  98
  99         if (ieee80211_have_rx_timestamp(status)) {
 100                 len = ALIGN(len, 8);
 101                 len += 8;
 102         }
 103         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 104                 len += 1;
 105
 106         /* antenna field, if we don't have per-chain info */
 107         if (!status->chains)
 108                 len += 1;
 109
 110         /* padding for RX_FLAGS if necessary */
 111         len = ALIGN(len, 2);
 112
 113         if (status->flag & RX_FLAG_HT) /* HT info */
 114                 len += 3;
 115
 116         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 117                 len = ALIGN(len, 4);
 118                 len += 8;
 119         }
 120
 121         if (status->flag & RX_FLAG_VHT) {
 122                 len = ALIGN(len, 2);
 123                 len += 12;
 124         }
 125
 126         if (status->chains) {
 127                 /* antenna and antenna signal fields */
 128                 len += 2 * hweight8(status->chains);
 129         }
 130
 131         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 132                 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
 133
 134                 /* vendor presence bitmap */
 135                 len += 4;
 136                 /* alignment for fixed 6-byte vendor data header */
 137                 len = ALIGN(len, 2);
 138                 /* vendor data header */
 139                 len += 6;
 140                 if (WARN_ON(rtap->align == 0))
 141                         rtap->align = 1;
 142                 len = ALIGN(len, rtap->align);
 143                 len += rtap->len + rtap->pad;
 144         }
 145
 146         return len;
 147 }
 148
 149 /*
 150  * ieee80211_add_rx_radiotap_header - add radiotap header
 151  *
 152  * add a radiotap header containing all the fields which the hardware provided.
 153  */
 154 static void
 155 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 156                                  struct sk_buff *skb,
 157                                  struct ieee80211_rate *rate,
 158                                  int rtap_len, bool has_fcs)
 159 {
 160         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 161         struct ieee80211_radiotap_header *rthdr;
 162         unsigned char *pos;
 163         __le32 *it_present;
 164         u32 it_present_val;
 165         u16 rx_flags = 0;
 166         u16 channel_flags = 0;
 167         int mpdulen, chain;
 168         unsigned long chains = status->chains;
 169         struct ieee80211_vendor_radiotap rtap = {};
 170
 171         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 172                 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
 173                 /* rtap.len and rtap.pad are undone immediately */
 174                 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
 175         }
 176
 177         mpdulen = skb->len;
 178         if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
 179                 mpdulen += FCS_LEN;
 180
 181         rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
 182         memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
 183         it_present = &rthdr->it_present;
 184
 185         /* radiotap header, set always present flags */
 186         rthdr->it_len = cpu_to_le16(rtap_len);
 187         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
 188                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
 189                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
 190
 191         if (!status->chains)
 192                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
 193
 194         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 195                 it_present_val |=
 196                         BIT(IEEE80211_RADIOTAP_EXT) |
 197                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
 198                 put_unaligned_le32(it_present_val, it_present);
 199                 it_present++;
 200                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
 201                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 202         }
 203
 204         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 205                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
 206                                   BIT(IEEE80211_RADIOTAP_EXT);
 207                 put_unaligned_le32(it_present_val, it_present);
 208                 it_present++;
 209                 it_present_val = rtap.present;
 210         }
 211
 212         put_unaligned_le32(it_present_val, it_present);
 213
 214         pos = (void *)(it_present + 1);
 215
 216         /* the order of the following fields is important */
 217
 218         /* IEEE80211_RADIOTAP_TSFT */
 219         if (ieee80211_have_rx_timestamp(status)) {
 220                 /* padding */
 221                 while ((pos - (u8 *)rthdr) & 7)
 222                         *pos++ = 0;
 223                 put_unaligned_le64(
 224                         ieee80211_calculate_rx_timestamp(local, status,
 225                                                          mpdulen, 0),
 226                         pos);
 227                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 228                 pos += 8;
 229         }
 230
 231         /* IEEE80211_RADIOTAP_FLAGS */
 232         if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
 233                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 234         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 235                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 236         if (status->flag & RX_FLAG_SHORTPRE)
 237                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 238         pos++;
 239
 240         /* IEEE80211_RADIOTAP_RATE */
 241         if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
 242                 /*
 243                  * Without rate information don't add it. If we have,
 244                  * MCS information is a separate field in radiotap,
 245                  * added below. The byte here is needed as padding
 246                  * for the channel though, so initialise it to 0.
 247                  */
 248                 *pos = 0;
 249         } else {
 250                 int shift = 0;
 251                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 252                 if (status->flag & RX_FLAG_10MHZ)
 253                         shift = 1;
 254                 else if (status->flag & RX_FLAG_5MHZ)
 255                         shift = 2;
 256                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
 257         }
 258         pos++;
 259
 260         /* IEEE80211_RADIOTAP_CHANNEL */
 261         put_unaligned_le16(status->freq, pos);
 262         pos += 2;
 263         if (status->flag & RX_FLAG_10MHZ)
 264                 channel_flags |= IEEE80211_CHAN_HALF;
 265         else if (status->flag & RX_FLAG_5MHZ)
 266                 channel_flags |= IEEE80211_CHAN_QUARTER;
 267
 268         if (status->band == IEEE80211_BAND_5GHZ)
 269                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 270         else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
 271                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 272         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 273                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 274         else if (rate)
 275                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
 276         else
 277                 channel_flags |= IEEE80211_CHAN_2GHZ;
 278         put_unaligned_le16(channel_flags, pos);
 279         pos += 2;
 280
 281         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 282         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
 283             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 284                 *pos = status->signal;
 285                 rthdr->it_present |=
 286                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 287                 pos++;
 288         }
 289
 290         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 291
 292         if (!status->chains) {
 293                 /* IEEE80211_RADIOTAP_ANTENNA */
 294                 *pos = status->antenna;
 295                 pos++;
 296         }
 297
 298         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 299
 300         /* IEEE80211_RADIOTAP_RX_FLAGS */
 301         /* ensure 2 byte alignment for the 2 byte field as required */
 302         if ((pos - (u8 *)rthdr) & 1)
 303                 *pos++ = 0;
 304         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 305                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 306         put_unaligned_le16(rx_flags, pos);
 307         pos += 2;
 308
 309         if (status->flag & RX_FLAG_HT) {
 310                 unsigned int stbc;
 311
 312                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 313                 *pos++ = local->hw.radiotap_mcs_details;
 314                 *pos = 0;
 315                 if (status->flag & RX_FLAG_SHORT_GI)
 316                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 317                 if (status->flag & RX_FLAG_40MHZ)
 318                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 319                 if (status->flag & RX_FLAG_HT_GF)
 320                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 321                 if (status->flag & RX_FLAG_LDPC)
 322                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
 323                 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
 324                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 325                 pos++;
 326                 *pos++ = status->rate_idx;
 327         }
 328
 329         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 330                 u16 flags = 0;
 331
 332                 /* ensure 4 byte alignment */
 333                 while ((pos - (u8 *)rthdr) & 3)
 334                         pos++;
 335                 rthdr->it_present |=
 336                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 337                 put_unaligned_le32(status->ampdu_reference, pos);
 338                 pos += 4;
 339                 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
 340                         flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
 341                 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
 342                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
 343                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 344                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 345                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 346                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 347                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 348                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 349                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 350                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 351                 put_unaligned_le16(flags, pos);
 352                 pos += 2;
 353                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 354                         *pos++ = status->ampdu_delimiter_crc;
 355                 else
 356                         *pos++ = 0;
 357                 *pos++ = 0;
 358         }
 359
 360         if (status->flag & RX_FLAG_VHT) {
 361                 u16 known = local->hw.radiotap_vht_details;
 362
 363                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 364                 put_unaligned_le16(known, pos);
 365                 pos += 2;
 366                 /* flags */
 367                 if (status->flag & RX_FLAG_SHORT_GI)
 368                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 369                 /* in VHT, STBC is binary */
 370                 if (status->flag & RX_FLAG_STBC_MASK)
 371                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
 372                 if (status->vht_flag & RX_VHT_FLAG_BF)
 373                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
 374                 pos++;
 375                 /* bandwidth */
 376                 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
 377                         *pos++ = 4;
 378                 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
 379                         *pos++ = 11;
 380                 else if (status->flag & RX_FLAG_40MHZ)
 381                         *pos++ = 1;
 382                 else /* 20 MHz */
 383                         *pos++ = 0;
 384                 /* MCS/NSS */
 385                 *pos = (status->rate_idx << 4) | status->vht_nss;
 386                 pos += 4;
 387                 /* coding field */
 388                 if (status->flag & RX_FLAG_LDPC)
 389                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
 390                 pos++;
 391                 /* group ID */
 392                 pos++;
 393                 /* partial_aid */
 394                 pos += 2;
 395         }
 396
 397         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 398                 *pos++ = status->chain_signal[chain];
 399                 *pos++ = chain;
 400         }
 401
 402         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 403                 /* ensure 2 byte alignment for the vendor field as required */
 404                 if ((pos - (u8 *)rthdr) & 1)
 405                         *pos++ = 0;
 406                 *pos++ = rtap.oui[0];
 407                 *pos++ = rtap.oui[1];
 408                 *pos++ = rtap.oui[2];
 409                 *pos++ = rtap.subns;
 410                 put_unaligned_le16(rtap.len, pos);
 411                 pos += 2;
 412                 /* align the actual payload as requested */
 413                 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
 414                         *pos++ = 0;
 415                 /* data (and possible padding) already follows */
 416         }
 417 }
 418
 419 /*
 420  * This function copies a received frame to all monitor interfaces and
 421  * returns a cleaned-up SKB that no longer includes the FCS nor the
 422  * radiotap header the driver might have added.
 423  */
 424 static struct sk_buff *
 425 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 426                      struct ieee80211_rate *rate)
 427 {
 428         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 429         struct ieee80211_sub_if_data *sdata;
 430         int rt_hdrlen, needed_headroom;
 431         struct sk_buff *skb, *skb2;
 432         struct net_device *prev_dev = NULL;
 433         int present_fcs_len = 0;
 434         unsigned int rtap_vendor_space = 0;
 435
 436         if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
 437                 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
 438
 439                 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
 440         }
 441
 442         /*
 443          * First, we may need to make a copy of the skb because
 444          *  (1) we need to modify it for radiotap (if not present), and
 445          *  (2) the other RX handlers will modify the skb we got.
 446          *
 447          * We don't need to, of course, if we aren't going to return
 448          * the SKB because it has a bad FCS/PLCP checksum.
 449          */
 450
 451         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
 452                 present_fcs_len = FCS_LEN;
 453
 454         /* ensure hdr->frame_control and vendor radiotap data are in skb head */
 455         if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
 456                 dev_kfree_skb(origskb);
 457                 return NULL;
 458         }
 459
 460         if (!local->monitors) {
 461                 if (should_drop_frame(origskb, present_fcs_len,
 462                                       rtap_vendor_space)) {
 463                         dev_kfree_skb(origskb);
 464                         return NULL;
 465                 }
 466
 467                 return remove_monitor_info(local, origskb, rtap_vendor_space);
 468         }
 469
 470         /* room for the radiotap header based on driver features */
 471         rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
 472         needed_headroom = rt_hdrlen - rtap_vendor_space;
 473
 474         if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) {
 475                 /* only need to expand headroom if necessary */
 476                 skb = origskb;
 477                 origskb = NULL;
 478
 479                 /*
 480                  * This shouldn't trigger often because most devices have an
 481                  * RX header they pull before we get here, and that should
 482                  * be big enough for our radiotap information. We should
 483                  * probably export the length to drivers so that we can have
 484                  * them allocate enough headroom to start with.
 485                  */
 486                 if (skb_headroom(skb) < needed_headroom &&
 487                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 488                         dev_kfree_skb(skb);
 489                         return NULL;
 490                 }
 491         } else {
 492                 /*
 493                  * Need to make a copy and possibly remove radiotap header
 494                  * and FCS from the original.
 495                  */
 496                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
 497
 498                 origskb = remove_monitor_info(local, origskb,
 499                                               rtap_vendor_space);
 500
 501                 if (!skb)
 502                         return origskb;
 503         }
 504
 505         /* prepend radiotap information */
 506         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
 507
 508         skb_reset_mac_header(skb);
 509         skb->ip_summed = CHECKSUM_UNNECESSARY;
 510         skb->pkt_type = PACKET_OTHERHOST;
 511         skb->protocol = htons(ETH_P_802_2);
 512
 513         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 514                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
 515                         continue;
 516
 517                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
 518                         continue;
 519
 520                 if (!ieee80211_sdata_running(sdata))
 521                         continue;
 522
 523                 if (prev_dev) {
 524                         skb2 = skb_clone(skb, GFP_ATOMIC);
 525                         if (skb2) {
 526                                 skb2->dev = prev_dev;
 527                                 netif_receive_skb(skb2);
 528                         }
 529                 }
 530
 531                 prev_dev = sdata->dev;
 532                 sdata->dev->stats.rx_packets++;
 533                 sdata->dev->stats.rx_bytes += skb->len;
 534         }
 535
 536         if (prev_dev) {
 537                 skb->dev = prev_dev;
 538                 netif_receive_skb(skb);
 539         } else
 540                 dev_kfree_skb(skb);
 541
 542         return origskb;
 543 }
 544
 545 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 546 {
 547         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 548         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 549         int tid, seqno_idx, security_idx;
 550
 551         /* does the frame have a qos control field? */
 552         if (ieee80211_is_data_qos(hdr->frame_control)) {
 553                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 554                 /* frame has qos control */
 555                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 556                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 557                         status->rx_flags |= IEEE80211_RX_AMSDU;
 558
 559                 seqno_idx = tid;
 560                 security_idx = tid;
 561         } else {
 562                 /*
 563                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 564                  *
 565                  *      Sequence numbers for management frames, QoS data
 566                  *      frames with a broadcast/multicast address in the
 567                  *      Address 1 field, and all non-QoS data frames sent
 568                  *      by QoS STAs are assigned using an additional single
 569                  *      modulo-4096 counter, [...]
 570                  *
 571                  * We also use that counter for non-QoS STAs.
 572                  */
 573                 seqno_idx = IEEE80211_NUM_TIDS;
 574                 security_idx = 0;
 575                 if (ieee80211_is_mgmt(hdr->frame_control))
 576                         security_idx = IEEE80211_NUM_TIDS;
 577                 tid = 0;
 578         }
 579
 580         rx->seqno_idx = seqno_idx;
 581         rx->security_idx = security_idx;
 582         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 583          * For now, set skb->priority to 0 for other cases. */
 584         rx->skb->priority = (tid > 7) ? 0 : tid;
 585 }
 586
 587 /**
 588  * DOC: Packet alignment
 589  *
 590  * Drivers always need to pass packets that are aligned to two-byte boundaries
 591  * to the stack.
 592  *
 593  * Additionally, should, if possible, align the payload data in a way that
 594  * guarantees that the contained IP header is aligned to a four-byte
 595  * boundary. In the case of regular frames, this simply means aligning the
 596  * payload to a four-byte boundary (because either the IP header is directly
 597  * contained, or IV/RFC1042 headers that have a length divisible by four are
 598  * in front of it).  If the payload data is not properly aligned and the
 599  * architecture doesn't support efficient unaligned operations, mac80211
 600  * will align the data.
 601  *
 602  * With A-MSDU frames, however, the payload data address must yield two modulo
 603  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 604  * push the IP header further back to a multiple of four again. Thankfully, the
 605  * specs were sane enough this time around to require padding each A-MSDU
 606  * subframe to a length that is a multiple of four.
 607  *
 608  * Padding like Atheros hardware adds which is between the 802.11 header and
 609  * the payload is not supported, the driver is required to move the 802.11
 610  * header to be directly in front of the payload in that case.
 611  */
 612 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 613 {
 614 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 615         WARN_ONCE((unsigned long)rx->skb->data & 1,
 616                   "unaligned packet at 0x%p\n", rx->skb->data);
 617 #endif
 618 }
 619
 620
 621 /* rx handlers */
 622
 623 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 624 {
 625         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 626
 627         if (is_multicast_ether_addr(hdr->addr1))
 628                 return 0;
 629
 630         return ieee80211_is_robust_mgmt_frame(skb);
 631 }
 632
 633
 634 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 635 {
 636         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 637
 638         if (!is_multicast_ether_addr(hdr->addr1))
 639                 return 0;
 640
 641         return ieee80211_is_robust_mgmt_frame(skb);
 642 }
 643
 644
 645 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 646 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 647 {
 648         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 649         struct ieee80211_mmie *mmie;
 650         struct ieee80211_mmie_16 *mmie16;
 651
 652         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 653                 return -1;
 654
 655         if (!ieee80211_is_robust_mgmt_frame(skb))
 656                 return -1; /* not a robust management frame */
 657
 658         mmie = (struct ieee80211_mmie *)
 659                 (skb->data + skb->len - sizeof(*mmie));
 660         if (mmie->element_id == WLAN_EID_MMIE &&
 661             mmie->length == sizeof(*mmie) - 2)
 662                 return le16_to_cpu(mmie->key_id);
 663
 664         mmie16 = (struct ieee80211_mmie_16 *)
 665                 (skb->data + skb->len - sizeof(*mmie16));
 666         if (skb->len >= 24 + sizeof(*mmie16) &&
 667             mmie16->element_id == WLAN_EID_MMIE &&
 668             mmie16->length == sizeof(*mmie16) - 2)
 669                 return le16_to_cpu(mmie16->key_id);
 670
 671         return -1;
 672 }
 673
 674 static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
 675                                  struct sk_buff *skb)
 676 {
 677         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 678         __le16 fc;
 679         int hdrlen;
 680         u8 keyid;
 681
 682         fc = hdr->frame_control;
 683         hdrlen = ieee80211_hdrlen(fc);
 684
 685         if (skb->len < hdrlen + cs->hdr_len)
 686                 return -EINVAL;
 687
 688         skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
 689         keyid &= cs->key_idx_mask;
 690         keyid >>= cs->key_idx_shift;
 691
 692         return keyid;
 693 }
 694
 695 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
 696 {
 697         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 698         char *dev_addr = rx->sdata->vif.addr;
 699
 700         if (ieee80211_is_data(hdr->frame_control)) {
 701                 if (is_multicast_ether_addr(hdr->addr1)) {
 702                         if (ieee80211_has_tods(hdr->frame_control) ||
 703                             !ieee80211_has_fromds(hdr->frame_control))
 704                                 return RX_DROP_MONITOR;
 705                         if (ether_addr_equal(hdr->addr3, dev_addr))
 706                                 return RX_DROP_MONITOR;
 707                 } else {
 708                         if (!ieee80211_has_a4(hdr->frame_control))
 709                                 return RX_DROP_MONITOR;
 710                         if (ether_addr_equal(hdr->addr4, dev_addr))
 711                                 return RX_DROP_MONITOR;
 712                 }
 713         }
 714
 715         /* If there is not an established peer link and this is not a peer link
 716          * establisment frame, beacon or probe, drop the frame.
 717          */
 718
 719         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
 720                 struct ieee80211_mgmt *mgmt;
 721
 722                 if (!ieee80211_is_mgmt(hdr->frame_control))
 723                         return RX_DROP_MONITOR;
 724
 725                 if (ieee80211_is_action(hdr->frame_control)) {
 726                         u8 category;
 727
 728                         /* make sure category field is present */
 729                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
 730                                 return RX_DROP_MONITOR;
 731
 732                         mgmt = (struct ieee80211_mgmt *)hdr;
 733                         category = mgmt->u.action.category;
 734                         if (category != WLAN_CATEGORY_MESH_ACTION &&
 735                             category != WLAN_CATEGORY_SELF_PROTECTED)
 736                                 return RX_DROP_MONITOR;
 737                         return RX_CONTINUE;
 738                 }
 739
 740                 if (ieee80211_is_probe_req(hdr->frame_control) ||
 741                     ieee80211_is_probe_resp(hdr->frame_control) ||
 742                     ieee80211_is_beacon(hdr->frame_control) ||
 743                     ieee80211_is_auth(hdr->frame_control))
 744                         return RX_CONTINUE;
 745
 746                 return RX_DROP_MONITOR;
 747         }
 748
 749         return RX_CONTINUE;
 750 }
 751
 752 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
 753                                             struct tid_ampdu_rx *tid_agg_rx,
 754                                             int index,
 755                                             struct sk_buff_head *frames)
 756 {
 757         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
 758         struct sk_buff *skb;
 759         struct ieee80211_rx_status *status;
 760
 761         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 762
 763         if (skb_queue_empty(skb_list))
 764                 goto no_frame;
 765
 766         if (!ieee80211_rx_reorder_ready(skb_list)) {
 767                 __skb_queue_purge(skb_list);
 768                 goto no_frame;
 769         }
 770
 771         /* release frames from the reorder ring buffer */
 772         tid_agg_rx->stored_mpdu_num--;
 773         while ((skb = __skb_dequeue(skb_list))) {
 774                 status = IEEE80211_SKB_RXCB(skb);
 775                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
 776                 __skb_queue_tail(frames, skb);
 777         }
 778
 779 no_frame:
 780         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 781 }
 782
 783 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
 784                                              struct tid_ampdu_rx *tid_agg_rx,
 785                                              u16 head_seq_num,
 786                                              struct sk_buff_head *frames)
 787 {
 788         int index;
 789
 790         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 791
 792         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
 793                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 794                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 795                                                 frames);
 796         }
 797 }
 798
 799 /*
 800  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
 801  * the skb was added to the buffer longer than this time ago, the earlier
 802  * frames that have not yet been received are assumed to be lost and the skb
 803  * can be released for processing. This may also release other skb's from the
 804  * reorder buffer if there are no additional gaps between the frames.
 805  *
 806  * Callers must hold tid_agg_rx->reorder_lock.
 807  */
 808 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
 809
 810 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
 811                                           struct tid_ampdu_rx *tid_agg_rx,
 812                                           struct sk_buff_head *frames)
 813 {
 814         int index, i, j;
 815
 816         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 817
 818         /* release the buffer until next missing frame */
 819         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 820         if (!ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index]) &&
 821             tid_agg_rx->stored_mpdu_num) {
 822                 /*
 823                  * No buffers ready to be released, but check whether any
 824                  * frames in the reorder buffer have timed out.
 825                  */
 826                 int skipped = 1;
 827                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
 828                      j = (j + 1) % tid_agg_rx->buf_size) {
 829                         if (!ieee80211_rx_reorder_ready(
 830                                         &tid_agg_rx->reorder_buf[j])) {
 831                                 skipped++;
 832                                 continue;
 833                         }
 834                         if (skipped &&
 835                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
 836                                         HT_RX_REORDER_BUF_TIMEOUT))
 837                                 goto set_release_timer;
 838
 839                         /* don't leave incomplete A-MSDUs around */
 840                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
 841                              i = (i + 1) % tid_agg_rx->buf_size)
 842                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
 843
 844                         ht_dbg_ratelimited(sdata,
 845                                            "release an RX reorder frame due to timeout on earlier frames\n");
 846                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
 847                                                         frames);
 848
 849                         /*
 850                          * Increment the head seq# also for the skipped slots.
 851                          */
 852                         tid_agg_rx->head_seq_num =
 853                                 (tid_agg_rx->head_seq_num +
 854                                  skipped) & IEEE80211_SN_MASK;
 855                         skipped = 0;
 856                 }
 857         } else while (ieee80211_rx_reorder_ready(
 858                                 &tid_agg_rx->reorder_buf[index])) {
 859                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 860                                                 frames);
 861                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 862         }
 863
 864         if (tid_agg_rx->stored_mpdu_num) {
 865                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 866
 867                 for (; j != (index - 1) % tid_agg_rx->buf_size;
 868                      j = (j + 1) % tid_agg_rx->buf_size) {
 869                         if (ieee80211_rx_reorder_ready(
 870                                         &tid_agg_rx->reorder_buf[j]))
 871                                 break;
 872                 }
 873
 874  set_release_timer:
 875
 876                 if (!tid_agg_rx->removed)
 877                         mod_timer(&tid_agg_rx->reorder_timer,
 878                                   tid_agg_rx->reorder_time[j] + 1 +
 879                                   HT_RX_REORDER_BUF_TIMEOUT);
 880         } else {
 881                 del_timer(&tid_agg_rx->reorder_timer);
 882         }
 883 }
 884
 885 /*
 886  * As this function belongs to the RX path it must be under
 887  * rcu_read_lock protection. It returns false if the frame
 888  * can be processed immediately, true if it was consumed.
 889  */
 890 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
 891                                              struct tid_ampdu_rx *tid_agg_rx,
 892                                              struct sk_buff *skb,
 893                                              struct sk_buff_head *frames)
 894 {
 895         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 896         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 897         u16 sc = le16_to_cpu(hdr->seq_ctrl);
 898         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
 899         u16 head_seq_num, buf_size;
 900         int index;
 901         bool ret = true;
 902
 903         spin_lock(&tid_agg_rx->reorder_lock);
 904
 905         /*
 906          * Offloaded BA sessions have no known starting sequence number so pick
 907          * one from first Rxed frame for this tid after BA was started.
 908          */
 909         if (unlikely(tid_agg_rx->auto_seq)) {
 910                 tid_agg_rx->auto_seq = false;
 911                 tid_agg_rx->ssn = mpdu_seq_num;
 912                 tid_agg_rx->head_seq_num = mpdu_seq_num;
 913         }
 914
 915         buf_size = tid_agg_rx->buf_size;
 916         head_seq_num = tid_agg_rx->head_seq_num;
 917
 918         /* frame with out of date sequence number */
 919         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
 920                 dev_kfree_skb(skb);
 921                 goto out;
 922         }
 923
 924         /*
 925          * If frame the sequence number exceeds our buffering window
 926          * size release some previous frames to make room for this one.
 927          */
 928         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
 929                 head_seq_num = ieee80211_sn_inc(
 930                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
 931                 /* release stored frames up to new head to stack */
 932                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
 933                                                  head_seq_num, frames);
 934         }
 935
 936         /* Now the new frame is always in the range of the reordering buffer */
 937
 938         index = mpdu_seq_num % tid_agg_rx->buf_size;
 939
 940         /* check if we already stored this frame */
 941         if (ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index])) {
 942                 dev_kfree_skb(skb);
 943                 goto out;
 944         }
 945
 946         /*
 947          * If the current MPDU is in the right order and nothing else
 948          * is stored we can process it directly, no need to buffer it.
 949          * If it is first but there's something stored, we may be able
 950          * to release frames after this one.
 951          */
 952         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
 953             tid_agg_rx->stored_mpdu_num == 0) {
 954                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
 955                         tid_agg_rx->head_seq_num =
 956                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 957                 ret = false;
 958                 goto out;
 959         }
 960
 961         /* put the frame in the reordering buffer */
 962         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
 963         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
 964                 tid_agg_rx->reorder_time[index] = jiffies;
 965                 tid_agg_rx->stored_mpdu_num++;
 966                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
 967         }
 968
 969  out:
 970         spin_unlock(&tid_agg_rx->reorder_lock);
 971         return ret;
 972 }
 973
 974 /*
 975  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
 976  * true if the MPDU was buffered, false if it should be processed.
 977  */
 978 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
 979                                        struct sk_buff_head *frames)
 980 {
 981         struct sk_buff *skb = rx->skb;
 982         struct ieee80211_local *local = rx->local;
 983         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 984         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 985         struct sta_info *sta = rx->sta;
 986         struct tid_ampdu_rx *tid_agg_rx;
 987         u16 sc;
 988         u8 tid, ack_policy;
 989
 990         if (!ieee80211_is_data_qos(hdr->frame_control) ||
 991             is_multicast_ether_addr(hdr->addr1))
 992                 goto dont_reorder;
 993
 994         /*
 995          * filter the QoS data rx stream according to
 996          * STA/TID and check if this STA/TID is on aggregation
 997          */
 998
 999         if (!sta)
1000                 goto dont_reorder;
1001
1002         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1003                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1004         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1005
1006         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1007         if (!tid_agg_rx)
1008                 goto dont_reorder;
1009
1010         /* qos null data frames are excluded */
1011         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1012                 goto dont_reorder;
1013
1014         /* not part of a BA session */
1015         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1016             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1017                 goto dont_reorder;
1018
1019         /* not actually part of this BA session */
1020         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1021                 goto dont_reorder;
1022
1023         /* new, potentially un-ordered, ampdu frame - process it */
1024
1025         /* reset session timer */
1026         if (tid_agg_rx->timeout)
1027                 tid_agg_rx->last_rx = jiffies;
1028
1029         /* if this mpdu is fragmented - terminate rx aggregation session */
1030         sc = le16_to_cpu(hdr->seq_ctrl);
1031         if (sc & IEEE80211_SCTL_FRAG) {
1032                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
1033                 skb_queue_tail(&rx->sdata->skb_queue, skb);
1034                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1035                 return;
1036         }
1037
1038         /*
1039          * No locking needed -- we will only ever process one
1040          * RX packet at a time, and thus own tid_agg_rx. All
1041          * other code manipulating it needs to (and does) make
1042          * sure that we cannot get to it any more before doing
1043          * anything with it.
1044          */
1045         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1046                                              frames))
1047                 return;
1048
1049  dont_reorder:
1050         __skb_queue_tail(frames, skb);
1051 }
1052
1053 static ieee80211_rx_result debug_noinline
1054 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1055 {
1056         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1057         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1058
1059         /*
1060          * Drop duplicate 802.11 retransmissions
1061          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1062          */
1063
1064         if (rx->skb->len < 24)
1065                 return RX_CONTINUE;
1066
1067         if (ieee80211_is_ctl(hdr->frame_control) ||
1068             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1069             is_multicast_ether_addr(hdr->addr1))
1070                 return RX_CONTINUE;
1071
1072         if (rx->sta) {
1073                 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1074                              rx->sta->last_seq_ctrl[rx->seqno_idx] ==
1075                              hdr->seq_ctrl)) {
1076                         if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
1077                                 rx->local->dot11FrameDuplicateCount++;
1078                                 rx->sta->num_duplicates++;
1079                         }
1080                         return RX_DROP_UNUSABLE;
1081                 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1082                         rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1083                 }
1084         }
1085
1086         return RX_CONTINUE;
1087 }
1088
1089 static ieee80211_rx_result debug_noinline
1090 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1091 {
1092         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1093
1094         if (unlikely(rx->skb->len < 16)) {
1095                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
1096                 return RX_DROP_MONITOR;
1097         }
1098
1099         /* Drop disallowed frame classes based on STA auth/assoc state;
1100          * IEEE 802.11, Chap 5.5.
1101          *
1102          * mac80211 filters only based on association state, i.e. it drops
1103          * Class 3 frames from not associated stations. hostapd sends
1104          * deauth/disassoc frames when needed. In addition, hostapd is
1105          * responsible for filtering on both auth and assoc states.
1106          */
1107
1108         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1109                 return ieee80211_rx_mesh_check(rx);
1110
1111         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1112                       ieee80211_is_pspoll(hdr->frame_control)) &&
1113                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1114                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1115                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1116                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1117                 /*
1118                  * accept port control frames from the AP even when it's not
1119                  * yet marked ASSOC to prevent a race where we don't set the
1120                  * assoc bit quickly enough before it sends the first frame
1121                  */
1122                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1123                     ieee80211_is_data_present(hdr->frame_control)) {
1124                         unsigned int hdrlen;
1125                         __be16 ethertype;
1126
1127                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1128
1129                         if (rx->skb->len < hdrlen + 8)
1130                                 return RX_DROP_MONITOR;
1131
1132                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1133                         if (ethertype == rx->sdata->control_port_protocol)
1134                                 return RX_CONTINUE;
1135                 }
1136
1137                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1138                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1139                                                hdr->addr2,
1140                                                GFP_ATOMIC))
1141                         return RX_DROP_UNUSABLE;
1142
1143                 return RX_DROP_MONITOR;
1144         }
1145
1146         return RX_CONTINUE;
1147 }
1148
1149
1150 static ieee80211_rx_result debug_noinline
1151 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1152 {
1153         struct ieee80211_local *local;
1154         struct ieee80211_hdr *hdr;
1155         struct sk_buff *skb;
1156
1157         local = rx->local;
1158         skb = rx->skb;
1159         hdr = (struct ieee80211_hdr *) skb->data;
1160
1161         if (!local->pspolling)
1162                 return RX_CONTINUE;
1163
1164         if (!ieee80211_has_fromds(hdr->frame_control))
1165                 /* this is not from AP */
1166                 return RX_CONTINUE;
1167
1168         if (!ieee80211_is_data(hdr->frame_control))
1169                 return RX_CONTINUE;
1170
1171         if (!ieee80211_has_moredata(hdr->frame_control)) {
1172                 /* AP has no more frames buffered for us */
1173                 local->pspolling = false;
1174                 return RX_CONTINUE;
1175         }
1176
1177         /* more data bit is set, let's request a new frame from the AP */
1178         ieee80211_send_pspoll(local, rx->sdata);
1179
1180         return RX_CONTINUE;
1181 }
1182
1183 static void sta_ps_start(struct sta_info *sta)
1184 {
1185         struct ieee80211_sub_if_data *sdata = sta->sdata;
1186         struct ieee80211_local *local = sdata->local;
1187         struct ps_data *ps;
1188         int tid;
1189
1190         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1191             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1192                 ps = &sdata->bss->ps;
1193         else
1194                 return;
1195
1196         atomic_inc(&ps->num_sta_ps);
1197         set_sta_flag(sta, WLAN_STA_PS_STA);
1198         if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1199                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1200         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1201                sta->sta.addr, sta->sta.aid);
1202
1203         if (!sta->sta.txq[0])
1204                 return;
1205
1206         for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1207                 struct txq_info *txqi = to_txq_info(sta->sta.txq[tid]);
1208
1209                 if (!skb_queue_len(&txqi->queue))
1210                         set_bit(tid, &sta->txq_buffered_tids);
1211                 else
1212                         clear_bit(tid, &sta->txq_buffered_tids);
1213         }
1214 }
1215
1216 static void sta_ps_end(struct sta_info *sta)
1217 {
1218         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1219                sta->sta.addr, sta->sta.aid);
1220
1221         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1222                 /*
1223                  * Clear the flag only if the other one is still set
1224                  * so that the TX path won't start TX'ing new frames
1225                  * directly ... In the case that the driver flag isn't
1226                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1227                  */
1228                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1229                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1230                        sta->sta.addr, sta->sta.aid);
1231                 return;
1232         }
1233
1234         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1235         clear_sta_flag(sta, WLAN_STA_PS_STA);
1236         ieee80211_sta_ps_deliver_wakeup(sta);
1237 }
1238
1239 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1240 {
1241         struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1242         bool in_ps;
1243
1244         WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1245
1246         /* Don't let the same PS state be set twice */
1247         in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1248         if ((start && in_ps) || (!start && !in_ps))
1249                 return -EINVAL;
1250
1251         if (start)
1252                 sta_ps_start(sta_inf);
1253         else
1254                 sta_ps_end(sta_inf);
1255
1256         return 0;
1257 }
1258 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1259
1260 static ieee80211_rx_result debug_noinline
1261 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1262 {
1263         struct ieee80211_sub_if_data *sdata = rx->sdata;
1264         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1265         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1266         int tid, ac;
1267
1268         if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1269                 return RX_CONTINUE;
1270
1271         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1272             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1273                 return RX_CONTINUE;
1274
1275         /*
1276          * The device handles station powersave, so don't do anything about
1277          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1278          * it to mac80211 since they're handled.)
1279          */
1280         if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1281                 return RX_CONTINUE;
1282
1283         /*
1284          * Don't do anything if the station isn't already asleep. In
1285          * the uAPSD case, the station will probably be marked asleep,
1286          * in the PS-Poll case the station must be confused ...
1287          */
1288         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1289                 return RX_CONTINUE;
1290
1291         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1292                 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1293                         if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1294                                 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1295                         else
1296                                 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1297                 }
1298
1299                 /* Free PS Poll skb here instead of returning RX_DROP that would
1300                  * count as an dropped frame. */
1301                 dev_kfree_skb(rx->skb);
1302
1303                 return RX_QUEUED;
1304         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1305                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1306                    ieee80211_has_pm(hdr->frame_control) &&
1307                    (ieee80211_is_data_qos(hdr->frame_control) ||
1308                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1309                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1310                 ac = ieee802_1d_to_ac[tid & 7];
1311
1312                 /*
1313                  * If this AC is not trigger-enabled do nothing.
1314                  *
1315                  * NB: This could/should check a separate bitmap of trigger-
1316                  * enabled queues, but for now we only implement uAPSD w/o
1317                  * TSPEC changes to the ACs, so they're always the same.
1318                  */
1319                 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1320                         return RX_CONTINUE;
1321
1322                 /* if we are in a service period, do nothing */
1323                 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1324                         return RX_CONTINUE;
1325
1326                 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1327                         ieee80211_sta_ps_deliver_uapsd(rx->sta);
1328                 else
1329                         set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1330         }
1331
1332         return RX_CONTINUE;
1333 }
1334
1335 static ieee80211_rx_result debug_noinline
1336 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1337 {
1338         struct sta_info *sta = rx->sta;
1339         struct sk_buff *skb = rx->skb;
1340         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1341         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1342         int i;
1343
1344         if (!sta)
1345                 return RX_CONTINUE;
1346
1347         /*
1348          * Update last_rx only for IBSS packets which are for the current
1349          * BSSID and for station already AUTHORIZED to avoid keeping the
1350          * current IBSS network alive in cases where other STAs start
1351          * using different BSSID. This will also give the station another
1352          * chance to restart the authentication/authorization in case
1353          * something went wrong the first time.
1354          */
1355         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1356                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1357                                                 NL80211_IFTYPE_ADHOC);
1358                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1359                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1360                         sta->last_rx = jiffies;
1361                         if (ieee80211_is_data(hdr->frame_control) &&
1362                             !is_multicast_ether_addr(hdr->addr1)) {
1363                                 sta->last_rx_rate_idx = status->rate_idx;
1364                                 sta->last_rx_rate_flag = status->flag;
1365                                 sta->last_rx_rate_vht_flag = status->vht_flag;
1366                                 sta->last_rx_rate_vht_nss = status->vht_nss;
1367                         }
1368                 }
1369         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1370                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1371                                                 NL80211_IFTYPE_OCB);
1372                 /* OCB uses wild-card BSSID */
1373                 if (is_broadcast_ether_addr(bssid))
1374                         sta->last_rx = jiffies;
1375         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1376                 /*
1377                  * Mesh beacons will update last_rx when if they are found to
1378                  * match the current local configuration when processed.
1379                  */
1380                 sta->last_rx = jiffies;
1381                 if (ieee80211_is_data(hdr->frame_control)) {
1382                         sta->last_rx_rate_idx = status->rate_idx;
1383                         sta->last_rx_rate_flag = status->flag;
1384                         sta->last_rx_rate_vht_flag = status->vht_flag;
1385                         sta->last_rx_rate_vht_nss = status->vht_nss;
1386                 }
1387         }
1388
1389         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1390                 return RX_CONTINUE;
1391
1392         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1393                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1394
1395         sta->rx_fragments++;
1396         sta->rx_bytes += rx->skb->len;
1397         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1398                 sta->last_signal = status->signal;
1399                 ewma_add(&sta->avg_signal, -status->signal);
1400         }
1401
1402         if (status->chains) {
1403                 sta->chains = status->chains;
1404                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1405                         int signal = status->chain_signal[i];
1406
1407                         if (!(status->chains & BIT(i)))
1408                                 continue;
1409
1410                         sta->chain_signal_last[i] = signal;
1411                         ewma_add(&sta->chain_signal_avg[i], -signal);
1412                 }
1413         }
1414
1415         /*
1416          * Change STA power saving mode only at the end of a frame
1417          * exchange sequence.
1418          */
1419         if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1420             !ieee80211_has_morefrags(hdr->frame_control) &&
1421             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1422             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1423              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1424             /* PM bit is only checked in frames where it isn't reserved,
1425              * in AP mode it's reserved in non-bufferable management frames
1426              * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1427              */
1428             (!ieee80211_is_mgmt(hdr->frame_control) ||
1429              ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1430                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1431                         if (!ieee80211_has_pm(hdr->frame_control))
1432                                 sta_ps_end(sta);
1433                 } else {
1434                         if (ieee80211_has_pm(hdr->frame_control))
1435                                 sta_ps_start(sta);
1436                 }
1437         }
1438
1439         /* mesh power save support */
1440         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1441                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1442
1443         /*
1444          * Drop (qos-)data::nullfunc frames silently, since they
1445          * are used only to control station power saving mode.
1446          */
1447         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1448             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1449                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1450
1451                 /*
1452                  * If we receive a 4-addr nullfunc frame from a STA
1453                  * that was not moved to a 4-addr STA vlan yet send
1454                  * the event to userspace and for older hostapd drop
1455                  * the frame to the monitor interface.
1456                  */
1457                 if (ieee80211_has_a4(hdr->frame_control) &&
1458                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1459                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1460                       !rx->sdata->u.vlan.sta))) {
1461                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1462                                 cfg80211_rx_unexpected_4addr_frame(
1463                                         rx->sdata->dev, sta->sta.addr,
1464                                         GFP_ATOMIC);
1465                         return RX_DROP_MONITOR;
1466                 }
1467                 /*
1468                  * Update counter and free packet here to avoid
1469                  * counting this as a dropped packed.
1470                  */
1471                 sta->rx_packets++;
1472                 dev_kfree_skb(rx->skb);
1473                 return RX_QUEUED;
1474         }
1475
1476         return RX_CONTINUE;
1477 } /* ieee80211_rx_h_sta_process */
1478
1479 static ieee80211_rx_result debug_noinline
1480 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1481 {
1482         struct sk_buff *skb = rx->skb;
1483         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1484         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1485         int keyidx;
1486         int hdrlen;
1487         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1488         struct ieee80211_key *sta_ptk = NULL;
1489         int mmie_keyidx = -1;
1490         __le16 fc;
1491         const struct ieee80211_cipher_scheme *cs = NULL;
1492
1493         /*
1494          * Key selection 101
1495          *
1496          * There are four types of keys:
1497          *  - GTK (group keys)
1498          *  - IGTK (group keys for management frames)
1499          *  - PTK (pairwise keys)
1500          *  - STK (station-to-station pairwise keys)
1501          *
1502          * When selecting a key, we have to distinguish between multicast
1503          * (including broadcast) and unicast frames, the latter can only
1504          * use PTKs and STKs while the former always use GTKs and IGTKs.
1505          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1506          * unicast frames can also use key indices like GTKs. Hence, if we
1507          * don't have a PTK/STK we check the key index for a WEP key.
1508          *
1509          * Note that in a regular BSS, multicast frames are sent by the
1510          * AP only, associated stations unicast the frame to the AP first
1511          * which then multicasts it on their behalf.
1512          *
1513          * There is also a slight problem in IBSS mode: GTKs are negotiated
1514          * with each station, that is something we don't currently handle.
1515          * The spec seems to expect that one negotiates the same key with
1516          * every station but there's no such requirement; VLANs could be
1517          * possible.
1518          */
1519
1520         /*
1521          * No point in finding a key and decrypting if the frame is neither
1522          * addressed to us nor a multicast frame.
1523          */
1524         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1525                 return RX_CONTINUE;
1526
1527         /* start without a key */
1528         rx->key = NULL;
1529         fc = hdr->frame_control;
1530
1531         if (rx->sta) {
1532                 int keyid = rx->sta->ptk_idx;
1533
1534                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1535                         cs = rx->sta->cipher_scheme;
1536                         keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1537                         if (unlikely(keyid < 0))
1538                                 return RX_DROP_UNUSABLE;
1539                 }
1540                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1541         }
1542
1543         if (!ieee80211_has_protected(fc))
1544                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1545
1546         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1547                 rx->key = sta_ptk;
1548                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1549                     (status->flag & RX_FLAG_IV_STRIPPED))
1550                         return RX_CONTINUE;
1551                 /* Skip decryption if the frame is not protected. */
1552                 if (!ieee80211_has_protected(fc))
1553                         return RX_CONTINUE;
1554         } else if (mmie_keyidx >= 0) {
1555                 /* Broadcast/multicast robust management frame / BIP */
1556                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1557                     (status->flag & RX_FLAG_IV_STRIPPED))
1558                         return RX_CONTINUE;
1559
1560                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1561                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1562                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1563                 if (rx->sta)
1564                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1565                 if (!rx->key)
1566                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1567         } else if (!ieee80211_has_protected(fc)) {
1568                 /*
1569                  * The frame was not protected, so skip decryption. However, we
1570                  * need to set rx->key if there is a key that could have been
1571                  * used so that the frame may be dropped if encryption would
1572                  * have been expected.
1573                  */
1574                 struct ieee80211_key *key = NULL;
1575                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1576                 int i;
1577
1578                 if (ieee80211_is_mgmt(fc) &&
1579                     is_multicast_ether_addr(hdr->addr1) &&
1580                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1581                         rx->key = key;
1582                 else {
1583                         if (rx->sta) {
1584                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1585                                         key = rcu_dereference(rx->sta->gtk[i]);
1586                                         if (key)
1587                                                 break;
1588                                 }
1589                         }
1590                         if (!key) {
1591                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1592                                         key = rcu_dereference(sdata->keys[i]);
1593                                         if (key)
1594                                                 break;
1595                                 }
1596                         }
1597                         if (key)
1598                                 rx->key = key;
1599                 }
1600                 return RX_CONTINUE;
1601         } else {
1602                 u8 keyid;
1603
1604                 /*
1605                  * The device doesn't give us the IV so we won't be
1606                  * able to look up the key. That's ok though, we
1607                  * don't need to decrypt the frame, we just won't
1608                  * be able to keep statistics accurate.
1609                  * Except for key threshold notifications, should
1610                  * we somehow allow the driver to tell us which key
1611                  * the hardware used if this flag is set?
1612                  */
1613                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1614                     (status->flag & RX_FLAG_IV_STRIPPED))
1615                         return RX_CONTINUE;
1616
1617                 hdrlen = ieee80211_hdrlen(fc);
1618
1619                 if (cs) {
1620                         keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
1621
1622                         if (unlikely(keyidx < 0))
1623                                 return RX_DROP_UNUSABLE;
1624                 } else {
1625                         if (rx->skb->len < 8 + hdrlen)
1626                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1627                         /*
1628                          * no need to call ieee80211_wep_get_keyidx,
1629                          * it verifies a bunch of things we've done already
1630                          */
1631                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1632                         keyidx = keyid >> 6;
1633                 }
1634
1635                 /* check per-station GTK first, if multicast packet */
1636                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1637                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1638
1639                 /* if not found, try default key */
1640                 if (!rx->key) {
1641                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1642
1643                         /*
1644                          * RSNA-protected unicast frames should always be
1645                          * sent with pairwise or station-to-station keys,
1646                          * but for WEP we allow using a key index as well.
1647                          */
1648                         if (rx->key &&
1649                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1650                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1651                             !is_multicast_ether_addr(hdr->addr1))
1652                                 rx->key = NULL;
1653                 }
1654         }
1655
1656         if (rx->key) {
1657                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1658                         return RX_DROP_MONITOR;
1659
1660                 rx->key->tx_rx_count++;
1661                 /* TODO: add threshold stuff again */
1662         } else {
1663                 return RX_DROP_MONITOR;
1664         }
1665
1666         switch (rx->key->conf.cipher) {
1667         case WLAN_CIPHER_SUITE_WEP40:
1668         case WLAN_CIPHER_SUITE_WEP104:
1669                 result = ieee80211_crypto_wep_decrypt(rx);
1670                 break;
1671         case WLAN_CIPHER_SUITE_TKIP:
1672                 result = ieee80211_crypto_tkip_decrypt(rx);
1673                 break;
1674         case WLAN_CIPHER_SUITE_CCMP:
1675                 result = ieee80211_crypto_ccmp_decrypt(
1676                         rx, IEEE80211_CCMP_MIC_LEN);
1677                 break;
1678         case WLAN_CIPHER_SUITE_CCMP_256:
1679                 result = ieee80211_crypto_ccmp_decrypt(
1680                         rx, IEEE80211_CCMP_256_MIC_LEN);
1681                 break;
1682         case WLAN_CIPHER_SUITE_AES_CMAC:
1683                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1684                 break;
1685         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1686                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1687                 break;
1688         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1689         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1690                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1691                 break;
1692         case WLAN_CIPHER_SUITE_GCMP:
1693         case WLAN_CIPHER_SUITE_GCMP_256:
1694                 result = ieee80211_crypto_gcmp_decrypt(rx);
1695                 break;
1696         default:
1697                 result = ieee80211_crypto_hw_decrypt(rx);
1698         }
1699
1700         /* the hdr variable is invalid after the decrypt handlers */
1701
1702         /* either the frame has been decrypted or will be dropped */
1703         status->flag |= RX_FLAG_DECRYPTED;
1704
1705         return result;
1706 }
1707
1708 static inline struct ieee80211_fragment_entry *
1709 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1710                          unsigned int frag, unsigned int seq, int rx_queue,
1711                          struct sk_buff **skb)
1712 {
1713         struct ieee80211_fragment_entry *entry;
1714
1715         entry = &sdata->fragments[sdata->fragment_next++];
1716         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1717                 sdata->fragment_next = 0;
1718
1719         if (!skb_queue_empty(&entry->skb_list))
1720                 __skb_queue_purge(&entry->skb_list);
1721
1722         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1723         *skb = NULL;
1724         entry->first_frag_time = jiffies;
1725         entry->seq = seq;
1726         entry->rx_queue = rx_queue;
1727         entry->last_frag = frag;
1728         entry->ccmp = 0;
1729         entry->extra_len = 0;
1730
1731         return entry;
1732 }
1733
1734 static inline struct ieee80211_fragment_entry *
1735 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1736                           unsigned int frag, unsigned int seq,
1737                           int rx_queue, struct ieee80211_hdr *hdr)
1738 {
1739         struct ieee80211_fragment_entry *entry;
1740         int i, idx;
1741
1742         idx = sdata->fragment_next;
1743         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1744                 struct ieee80211_hdr *f_hdr;
1745
1746                 idx--;
1747                 if (idx < 0)
1748                         idx = IEEE80211_FRAGMENT_MAX - 1;
1749
1750                 entry = &sdata->fragments[idx];
1751                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1752                     entry->rx_queue != rx_queue ||
1753                     entry->last_frag + 1 != frag)
1754                         continue;
1755
1756                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1757
1758                 /*
1759                  * Check ftype and addresses are equal, else check next fragment
1760                  */
1761                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1762                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1763                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1764                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1765                         continue;
1766
1767                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1768                         __skb_queue_purge(&entry->skb_list);
1769                         continue;
1770                 }
1771                 return entry;
1772         }
1773
1774         return NULL;
1775 }
1776
1777 static ieee80211_rx_result debug_noinline
1778 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1779 {
1780         struct ieee80211_hdr *hdr;
1781         u16 sc;
1782         __le16 fc;
1783         unsigned int frag, seq;
1784         struct ieee80211_fragment_entry *entry;
1785         struct sk_buff *skb;
1786         struct ieee80211_rx_status *status;
1787
1788         hdr = (struct ieee80211_hdr *)rx->skb->data;
1789         fc = hdr->frame_control;
1790
1791         if (ieee80211_is_ctl(fc))
1792                 return RX_CONTINUE;
1793
1794         sc = le16_to_cpu(hdr->seq_ctrl);
1795         frag = sc & IEEE80211_SCTL_FRAG;
1796
1797         if (is_multicast_ether_addr(hdr->addr1)) {
1798                 rx->local->dot11MulticastReceivedFrameCount++;
1799                 goto out_no_led;
1800         }
1801
1802         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1803                 goto out;
1804
1805         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1806
1807         if (skb_linearize(rx->skb))
1808                 return RX_DROP_UNUSABLE;
1809
1810         /*
1811          *  skb_linearize() might change the skb->data and
1812          *  previously cached variables (in this case, hdr) need to
1813          *  be refreshed with the new data.
1814          */
1815         hdr = (struct ieee80211_hdr *)rx->skb->data;
1816         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1817
1818         if (frag == 0) {
1819                 /* This is the first fragment of a new frame. */
1820                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1821                                                  rx->seqno_idx, &(rx->skb));
1822                 if (rx->key &&
1823                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
1824                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256) &&
1825                     ieee80211_has_protected(fc)) {
1826                         int queue = rx->security_idx;
1827                         /* Store CCMP PN so that we can verify that the next
1828                          * fragment has a sequential PN value. */
1829                         entry->ccmp = 1;
1830                         memcpy(entry->last_pn,
1831                                rx->key->u.ccmp.rx_pn[queue],
1832                                IEEE80211_CCMP_PN_LEN);
1833                 }
1834                 return RX_QUEUED;
1835         }
1836
1837         /* This is a fragment for a frame that should already be pending in
1838          * fragment cache. Add this fragment to the end of the pending entry.
1839          */
1840         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1841                                           rx->seqno_idx, hdr);
1842         if (!entry) {
1843                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1844                 return RX_DROP_MONITOR;
1845         }
1846
1847         /* Verify that MPDUs within one MSDU have sequential PN values.
1848          * (IEEE 802.11i, 8.3.3.4.5) */
1849         if (entry->ccmp) {
1850                 int i;
1851                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1852                 int queue;
1853                 if (!rx->key ||
1854                     (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
1855                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256))
1856                         return RX_DROP_UNUSABLE;
1857                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1858                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1859                         pn[i]++;
1860                         if (pn[i])
1861                                 break;
1862                 }
1863                 queue = rx->security_idx;
1864                 rpn = rx->key->u.ccmp.rx_pn[queue];
1865                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1866                         return RX_DROP_UNUSABLE;
1867                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1868         }
1869
1870         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1871         __skb_queue_tail(&entry->skb_list, rx->skb);
1872         entry->last_frag = frag;
1873         entry->extra_len += rx->skb->len;
1874         if (ieee80211_has_morefrags(fc)) {
1875                 rx->skb = NULL;
1876                 return RX_QUEUED;
1877         }
1878
1879         rx->skb = __skb_dequeue(&entry->skb_list);
1880         if (skb_tailroom(rx->skb) < entry->extra_len) {
1881                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1882                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1883                                               GFP_ATOMIC))) {
1884                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1885                         __skb_queue_purge(&entry->skb_list);
1886                         return RX_DROP_UNUSABLE;
1887                 }
1888         }
1889         while ((skb = __skb_dequeue(&entry->skb_list))) {
1890                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1891                 dev_kfree_skb(skb);
1892         }
1893
1894         /* Complete frame has been reassembled - process it now */
1895         status = IEEE80211_SKB_RXCB(rx->skb);
1896         status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1897
1898  out:
1899         ieee80211_led_rx(rx->local);
1900  out_no_led:
1901         if (rx->sta)
1902                 rx->sta->rx_packets++;
1903         return RX_CONTINUE;
1904 }
1905
1906 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1907 {
1908         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1909                 return -EACCES;
1910
1911         return 0;
1912 }
1913
1914 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1915 {
1916         struct sk_buff *skb = rx->skb;
1917         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1918
1919         /*
1920          * Pass through unencrypted frames if the hardware has
1921          * decrypted them already.
1922          */
1923         if (status->flag & RX_FLAG_DECRYPTED)
1924                 return 0;
1925
1926         /* Drop unencrypted frames if key is set. */
1927         if (unlikely(!ieee80211_has_protected(fc) &&
1928                      !ieee80211_is_nullfunc(fc) &&
1929                      ieee80211_is_data(fc) && rx->key))
1930                 return -EACCES;
1931
1932         return 0;
1933 }
1934
1935 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1936 {
1937         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1938         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1939         __le16 fc = hdr->frame_control;
1940
1941         /*
1942          * Pass through unencrypted frames if the hardware has
1943          * decrypted them already.
1944          */
1945         if (status->flag & RX_FLAG_DECRYPTED)
1946                 return 0;
1947
1948         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1949                 if (unlikely(!ieee80211_has_protected(fc) &&
1950                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1951                              rx->key)) {
1952                         if (ieee80211_is_deauth(fc) ||
1953                             ieee80211_is_disassoc(fc))
1954                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1955                                                              rx->skb->data,
1956                                                              rx->skb->len);
1957                         return -EACCES;
1958                 }
1959                 /* BIP does not use Protected field, so need to check MMIE */
1960                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1961                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1962                         if (ieee80211_is_deauth(fc) ||
1963                             ieee80211_is_disassoc(fc))
1964                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1965                                                              rx->skb->data,
1966                                                              rx->skb->len);
1967                         return -EACCES;
1968                 }
1969                 /*
1970                  * When using MFP, Action frames are not allowed prior to
1971                  * having configured keys.
1972                  */
1973                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1974                              ieee80211_is_robust_mgmt_frame(rx->skb)))
1975                         return -EACCES;
1976         }
1977
1978         return 0;
1979 }
1980
1981 static int
1982 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1983 {
1984         struct ieee80211_sub_if_data *sdata = rx->sdata;
1985         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1986         bool check_port_control = false;
1987         struct ethhdr *ehdr;
1988         int ret;
1989
1990         *port_control = false;
1991         if (ieee80211_has_a4(hdr->frame_control) &&
1992             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1993                 return -1;
1994
1995         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1996             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1997
1998                 if (!sdata->u.mgd.use_4addr)
1999                         return -1;
2000                 else
2001                         check_port_control = true;
2002         }
2003
2004         if (is_multicast_ether_addr(hdr->addr1) &&
2005             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2006                 return -1;
2007
2008         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2009         if (ret < 0)
2010                 return ret;
2011
2012         ehdr = (struct ethhdr *) rx->skb->data;
2013         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2014                 *port_control = true;
2015         else if (check_port_control)
2016                 return -1;
2017
2018         return 0;
2019 }
2020
2021 /*
2022  * requires that rx->skb is a frame with ethernet header
2023  */
2024 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2025 {
2026         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2027                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2028         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2029
2030         /*
2031          * Allow EAPOL frames to us/the PAE group address regardless
2032          * of whether the frame was encrypted or not.
2033          */
2034         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2035             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2036              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2037                 return true;
2038
2039         if (ieee80211_802_1x_port_control(rx) ||
2040             ieee80211_drop_unencrypted(rx, fc))
2041                 return false;
2042
2043         return true;
2044 }
2045
2046 /*
2047  * requires that rx->skb is a frame with ethernet header
2048  */
2049 static void
2050 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2051 {
2052         struct ieee80211_sub_if_data *sdata = rx->sdata;
2053         struct net_device *dev = sdata->dev;
2054         struct sk_buff *skb, *xmit_skb;
2055         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2056         struct sta_info *dsta;
2057         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2058
2059         dev->stats.rx_packets++;
2060         dev->stats.rx_bytes += rx->skb->len;
2061
2062         skb = rx->skb;
2063         xmit_skb = NULL;
2064
2065         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2066              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2067             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2068             (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
2069             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2070                 if (is_multicast_ether_addr(ehdr->h_dest)) {
2071                         /*
2072                          * send multicast frames both to higher layers in
2073                          * local net stack and back to the wireless medium
2074                          */
2075                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2076                         if (!xmit_skb)
2077                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2078                                                     dev->name);
2079                 } else {
2080                         dsta = sta_info_get(sdata, skb->data);
2081                         if (dsta) {
2082                                 /*
2083                                  * The destination station is associated to
2084                                  * this AP (in this VLAN), so send the frame
2085                                  * directly to it and do not pass it to local
2086                                  * net stack.
2087                                  */
2088                                 xmit_skb = skb;
2089                                 skb = NULL;
2090                         }
2091                 }
2092         }
2093
2094 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2095         if (skb) {
2096                 /* 'align' will only take the values 0 or 2 here since all
2097                  * frames are required to be aligned to 2-byte boundaries
2098                  * when being passed to mac80211; the code here works just
2099                  * as well if that isn't true, but mac80211 assumes it can
2100                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2101                  */
2102                 int align;
2103
2104                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2105                 if (align) {
2106                         if (WARN_ON(skb_headroom(skb) < 3)) {
2107                                 dev_kfree_skb(skb);
2108                                 skb = NULL;
2109                         } else {
2110                                 u8 *data = skb->data;
2111                                 size_t len = skb_headlen(skb);
2112                                 skb->data -= align;
2113                                 memmove(skb->data, data, len);
2114                                 skb_set_tail_pointer(skb, len);
2115                         }
2116                 }
2117         }
2118 #endif
2119
2120         if (skb) {
2121                 /* deliver to local stack */
2122                 skb->protocol = eth_type_trans(skb, dev);
2123                 memset(skb->cb, 0, sizeof(skb->cb));
2124                 if (!(rx->flags & IEEE80211_RX_REORDER_TIMER) &&
2125                     rx->local->napi)
2126                         napi_gro_receive(rx->local->napi, skb);
2127                 else
2128                         netif_receive_skb(skb);
2129         }
2130
2131         if (xmit_skb) {
2132                 /*
2133                  * Send to wireless media and increase priority by 256 to
2134                  * keep the received priority instead of reclassifying
2135                  * the frame (see cfg80211_classify8021d).
2136                  */
2137                 xmit_skb->priority += 256;
2138                 xmit_skb->protocol = htons(ETH_P_802_3);
2139                 skb_reset_network_header(xmit_skb);
2140                 skb_reset_mac_header(xmit_skb);
2141                 dev_queue_xmit(xmit_skb);
2142         }
2143 }
2144
2145 static ieee80211_rx_result debug_noinline
2146 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2147 {
2148         struct net_device *dev = rx->sdata->dev;
2149         struct sk_buff *skb = rx->skb;
2150         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2151         __le16 fc = hdr->frame_control;
2152         struct sk_buff_head frame_list;
2153         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2154
2155         if (unlikely(!ieee80211_is_data(fc)))
2156                 return RX_CONTINUE;
2157
2158         if (unlikely(!ieee80211_is_data_present(fc)))
2159                 return RX_DROP_MONITOR;
2160
2161         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2162                 return RX_CONTINUE;
2163
2164         if (ieee80211_has_a4(hdr->frame_control) &&
2165             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2166             !rx->sdata->u.vlan.sta)
2167                 return RX_DROP_UNUSABLE;
2168
2169         if (is_multicast_ether_addr(hdr->addr1) &&
2170             ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2171               rx->sdata->u.vlan.sta) ||
2172              (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2173               rx->sdata->u.mgd.use_4addr)))
2174                 return RX_DROP_UNUSABLE;
2175
2176         skb->dev = dev;
2177         __skb_queue_head_init(&frame_list);
2178
2179         if (skb_linearize(skb))
2180                 return RX_DROP_UNUSABLE;
2181
2182         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2183                                  rx->sdata->vif.type,
2184                                  rx->local->hw.extra_tx_headroom, true);
2185
2186         while (!skb_queue_empty(&frame_list)) {
2187                 rx->skb = __skb_dequeue(&frame_list);
2188
2189                 if (!ieee80211_frame_allowed(rx, fc)) {
2190                         dev_kfree_skb(rx->skb);
2191                         continue;
2192                 }
2193
2194                 ieee80211_deliver_skb(rx);
2195         }
2196
2197         return RX_QUEUED;
2198 }
2199
2200 #ifdef CONFIG_MAC80211_MESH
2201 static ieee80211_rx_result
2202 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2203 {
2204         struct ieee80211_hdr *fwd_hdr, *hdr;
2205         struct ieee80211_tx_info *info;
2206         struct ieee80211s_hdr *mesh_hdr;
2207         struct sk_buff *skb = rx->skb, *fwd_skb;
2208         struct ieee80211_local *local = rx->local;
2209         struct ieee80211_sub_if_data *sdata = rx->sdata;
2210         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2211         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2212         u16 q, hdrlen;
2213
2214         hdr = (struct ieee80211_hdr *) skb->data;
2215         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2216
2217         /* make sure fixed part of mesh header is there, also checks skb len */
2218         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2219                 return RX_DROP_MONITOR;
2220
2221         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2222
2223         /* make sure full mesh header is there, also checks skb len */
2224         if (!pskb_may_pull(rx->skb,
2225                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2226                 return RX_DROP_MONITOR;
2227
2228         /* reload pointers */
2229         hdr = (struct ieee80211_hdr *) skb->data;
2230         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2231
2232         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2233                 return RX_DROP_MONITOR;
2234
2235         /* frame is in RMC, don't forward */
2236         if (ieee80211_is_data(hdr->frame_control) &&
2237             is_multicast_ether_addr(hdr->addr1) &&
2238             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2239                 return RX_DROP_MONITOR;
2240
2241         if (!ieee80211_is_data(hdr->frame_control) ||
2242             !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2243                 return RX_CONTINUE;
2244
2245         if (!mesh_hdr->ttl)
2246                 return RX_DROP_MONITOR;
2247
2248         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2249                 struct mesh_path *mppath;
2250                 char *proxied_addr;
2251                 char *mpp_addr;
2252
2253                 if (is_multicast_ether_addr(hdr->addr1)) {
2254                         mpp_addr = hdr->addr3;
2255                         proxied_addr = mesh_hdr->eaddr1;
2256                 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2257                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2258                         mpp_addr = hdr->addr4;
2259                         proxied_addr = mesh_hdr->eaddr2;
2260                 } else {
2261                         return RX_DROP_MONITOR;
2262                 }
2263
2264                 rcu_read_lock();
2265                 mppath = mpp_path_lookup(sdata, proxied_addr);
2266                 if (!mppath) {
2267                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2268                 } else {
2269                         spin_lock_bh(&mppath->state_lock);
2270                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2271                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2272                         spin_unlock_bh(&mppath->state_lock);
2273                 }
2274                 rcu_read_unlock();
2275         }
2276
2277         /* Frame has reached destination.  Don't forward */
2278         if (!is_multicast_ether_addr(hdr->addr1) &&
2279             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2280                 return RX_CONTINUE;
2281
2282         q = ieee80211_select_queue_80211(sdata, skb, hdr);
2283         if (ieee80211_queue_stopped(&local->hw, q)) {
2284                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2285                 return RX_DROP_MONITOR;
2286         }
2287         skb_set_queue_mapping(skb, q);
2288
2289         if (!--mesh_hdr->ttl) {
2290                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2291                 goto out;
2292         }
2293
2294         if (!ifmsh->mshcfg.dot11MeshForwarding)
2295                 goto out;
2296
2297         fwd_skb = skb_copy(skb, GFP_ATOMIC);
2298         if (!fwd_skb) {
2299                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2300                                     sdata->name);
2301                 goto out;
2302         }
2303
2304         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2305         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2306         info = IEEE80211_SKB_CB(fwd_skb);
2307         memset(info, 0, sizeof(*info));
2308         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2309         info->control.vif = &rx->sdata->vif;
2310         info->control.jiffies = jiffies;
2311         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2312                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2313                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2314                 /* update power mode indication when forwarding */
2315                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2316         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2317                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2318                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2319         } else {
2320                 /* unable to resolve next hop */
2321                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2322                                    fwd_hdr->addr3, 0,
2323                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2324                                    fwd_hdr->addr2);
2325                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2326                 kfree_skb(fwd_skb);
2327                 return RX_DROP_MONITOR;
2328         }
2329
2330         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2331         ieee80211_add_pending_skb(local, fwd_skb);
2332  out:
2333         if (is_multicast_ether_addr(hdr->addr1) ||
2334             sdata->dev->flags & IFF_PROMISC)
2335                 return RX_CONTINUE;
2336         else
2337                 return RX_DROP_MONITOR;
2338 }
2339 #endif
2340
2341 static ieee80211_rx_result debug_noinline
2342 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2343 {
2344         struct ieee80211_sub_if_data *sdata = rx->sdata;
2345         struct ieee80211_local *local = rx->local;
2346         struct net_device *dev = sdata->dev;
2347         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2348         __le16 fc = hdr->frame_control;
2349         bool port_control;
2350         int err;
2351
2352         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2353                 return RX_CONTINUE;
2354
2355         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2356                 return RX_DROP_MONITOR;
2357
2358         if (rx->sta) {
2359                 /* The seqno index has the same property as needed
2360                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2361                  * for non-QoS-data frames. Here we know it's a data
2362                  * frame, so count MSDUs.
2363                  */
2364                 rx->sta->rx_msdu[rx->seqno_idx]++;
2365         }
2366
2367         /*
2368          * Send unexpected-4addr-frame event to hostapd. For older versions,
2369          * also drop the frame to cooked monitor interfaces.
2370          */
2371         if (ieee80211_has_a4(hdr->frame_control) &&
2372             sdata->vif.type == NL80211_IFTYPE_AP) {
2373                 if (rx->sta &&
2374                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2375                         cfg80211_rx_unexpected_4addr_frame(
2376                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2377                 return RX_DROP_MONITOR;
2378         }
2379
2380         err = __ieee80211_data_to_8023(rx, &port_control);
2381         if (unlikely(err))
2382                 return RX_DROP_UNUSABLE;
2383
2384         if (!ieee80211_frame_allowed(rx, fc))
2385                 return RX_DROP_MONITOR;
2386
2387         /* directly handle TDLS channel switch requests/responses */
2388         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2389                                                 cpu_to_be16(ETH_P_TDLS))) {
2390                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2391
2392                 if (pskb_may_pull(rx->skb,
2393                                   offsetof(struct ieee80211_tdls_data, u)) &&
2394                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2395                     tf->category == WLAN_CATEGORY_TDLS &&
2396                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2397                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2398                         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TDLS_CHSW;
2399                         skb_queue_tail(&sdata->skb_queue, rx->skb);
2400                         ieee80211_queue_work(&rx->local->hw, &sdata->work);
2401                         if (rx->sta)
2402                                 rx->sta->rx_packets++;
2403
2404                         return RX_QUEUED;
2405                 }
2406         }
2407
2408         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2409             unlikely(port_control) && sdata->bss) {
2410                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2411                                      u.ap);
2412                 dev = sdata->dev;
2413                 rx->sdata = sdata;
2414         }
2415
2416         rx->skb->dev = dev;
2417
2418         if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2419             !is_multicast_ether_addr(
2420                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2421             (!local->scanning &&
2422              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2423                         mod_timer(&local->dynamic_ps_timer, jiffies +
2424                          msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2425         }
2426
2427         ieee80211_deliver_skb(rx);
2428
2429         return RX_QUEUED;
2430 }
2431
2432 static ieee80211_rx_result debug_noinline
2433 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2434 {
2435         struct sk_buff *skb = rx->skb;
2436         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2437         struct tid_ampdu_rx *tid_agg_rx;
2438         u16 start_seq_num;
2439         u16 tid;
2440
2441         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2442                 return RX_CONTINUE;
2443
2444         if (ieee80211_is_back_req(bar->frame_control)) {
2445                 struct {
2446                         __le16 control, start_seq_num;
2447                 } __packed bar_data;
2448
2449                 if (!rx->sta)
2450                         return RX_DROP_MONITOR;
2451
2452                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2453                                   &bar_data, sizeof(bar_data)))
2454                         return RX_DROP_MONITOR;
2455
2456                 tid = le16_to_cpu(bar_data.control) >> 12;
2457
2458                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2459                 if (!tid_agg_rx)
2460                         return RX_DROP_MONITOR;
2461
2462                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2463
2464                 /* reset session timer */
2465                 if (tid_agg_rx->timeout)
2466                         mod_timer(&tid_agg_rx->session_timer,
2467                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2468
2469                 spin_lock(&tid_agg_rx->reorder_lock);
2470                 /* release stored frames up to start of BAR */
2471                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2472                                                  start_seq_num, frames);
2473                 spin_unlock(&tid_agg_rx->reorder_lock);
2474
2475                 kfree_skb(skb);
2476                 return RX_QUEUED;
2477         }
2478
2479         /*
2480          * After this point, we only want management frames,
2481          * so we can drop all remaining control frames to
2482          * cooked monitor interfaces.
2483          */
2484         return RX_DROP_MONITOR;
2485 }
2486
2487 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2488                                            struct ieee80211_mgmt *mgmt,
2489                                            size_t len)
2490 {
2491         struct ieee80211_local *local = sdata->local;
2492         struct sk_buff *skb;
2493         struct ieee80211_mgmt *resp;
2494
2495         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2496                 /* Not to own unicast address */
2497                 return;
2498         }
2499
2500         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2501             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2502                 /* Not from the current AP or not associated yet. */
2503                 return;
2504         }
2505
2506         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2507                 /* Too short SA Query request frame */
2508                 return;
2509         }
2510
2511         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2512         if (skb == NULL)
2513                 return;
2514
2515         skb_reserve(skb, local->hw.extra_tx_headroom);
2516         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2517         memset(resp, 0, 24);
2518         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2519         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2520         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2521         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2522                                           IEEE80211_STYPE_ACTION);
2523         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2524         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2525         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2526         memcpy(resp->u.action.u.sa_query.trans_id,
2527                mgmt->u.action.u.sa_query.trans_id,
2528                WLAN_SA_QUERY_TR_ID_LEN);
2529
2530         ieee80211_tx_skb(sdata, skb);
2531 }
2532
2533 static ieee80211_rx_result debug_noinline
2534 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2535 {
2536         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2537         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2538
2539         /*
2540          * From here on, look only at management frames.
2541          * Data and control frames are already handled,
2542          * and unknown (reserved) frames are useless.
2543          */
2544         if (rx->skb->len < 24)
2545                 return RX_DROP_MONITOR;
2546
2547         if (!ieee80211_is_mgmt(mgmt->frame_control))
2548                 return RX_DROP_MONITOR;
2549
2550         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2551             ieee80211_is_beacon(mgmt->frame_control) &&
2552             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2553                 int sig = 0;
2554
2555                 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2556                         sig = status->signal;
2557
2558                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2559                                             rx->skb->data, rx->skb->len,
2560                                             status->freq, sig);
2561                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2562         }
2563
2564         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2565                 return RX_DROP_MONITOR;
2566
2567         if (ieee80211_drop_unencrypted_mgmt(rx))
2568                 return RX_DROP_UNUSABLE;
2569
2570         return RX_CONTINUE;
2571 }
2572
2573 static ieee80211_rx_result debug_noinline
2574 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2575 {
2576         struct ieee80211_local *local = rx->local;
2577         struct ieee80211_sub_if_data *sdata = rx->sdata;
2578         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2579         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2580         int len = rx->skb->len;
2581
2582         if (!ieee80211_is_action(mgmt->frame_control))
2583                 return RX_CONTINUE;
2584
2585         /* drop too small frames */
2586         if (len < IEEE80211_MIN_ACTION_SIZE)
2587                 return RX_DROP_UNUSABLE;
2588
2589         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2590             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2591             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2592                 return RX_DROP_UNUSABLE;
2593
2594         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2595                 return RX_DROP_UNUSABLE;
2596
2597         switch (mgmt->u.action.category) {
2598         case WLAN_CATEGORY_HT:
2599                 /* reject HT action frames from stations not supporting HT */
2600                 if (!rx->sta->sta.ht_cap.ht_supported)
2601                         goto invalid;
2602
2603                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2604                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2605                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2606                     sdata->vif.type != NL80211_IFTYPE_AP &&
2607                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2608                         break;
2609
2610                 /* verify action & smps_control/chanwidth are present */
2611                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2612                         goto invalid;
2613
2614                 switch (mgmt->u.action.u.ht_smps.action) {
2615                 case WLAN_HT_ACTION_SMPS: {
2616                         struct ieee80211_supported_band *sband;
2617                         enum ieee80211_smps_mode smps_mode;
2618
2619                         /* convert to HT capability */
2620                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2621                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2622                                 smps_mode = IEEE80211_SMPS_OFF;
2623                                 break;
2624                         case WLAN_HT_SMPS_CONTROL_STATIC:
2625                                 smps_mode = IEEE80211_SMPS_STATIC;
2626                                 break;
2627                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2628                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2629                                 break;
2630                         default:
2631                                 goto invalid;
2632                         }
2633
2634                         /* if no change do nothing */
2635                         if (rx->sta->sta.smps_mode == smps_mode)
2636                                 goto handled;
2637                         rx->sta->sta.smps_mode = smps_mode;
2638
2639                         sband = rx->local->hw.wiphy->bands[status->band];
2640
2641                         rate_control_rate_update(local, sband, rx->sta,
2642                                                  IEEE80211_RC_SMPS_CHANGED);
2643                         goto handled;
2644                 }
2645                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2646                         struct ieee80211_supported_band *sband;
2647                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2648                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
2649
2650                         /* If it doesn't support 40 MHz it can't change ... */
2651                         if (!(rx->sta->sta.ht_cap.cap &
2652                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2653                                 goto handled;
2654
2655                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2656                                 max_bw = IEEE80211_STA_RX_BW_20;
2657                         else
2658                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2659
2660                         /* set cur_max_bandwidth and recalc sta bw */
2661                         rx->sta->cur_max_bandwidth = max_bw;
2662                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2663
2664                         if (rx->sta->sta.bandwidth == new_bw)
2665                                 goto handled;
2666
2667                         rx->sta->sta.bandwidth = new_bw;
2668                         sband = rx->local->hw.wiphy->bands[status->band];
2669
2670                         rate_control_rate_update(local, sband, rx->sta,
2671                                                  IEEE80211_RC_BW_CHANGED);
2672                         goto handled;
2673                 }
2674                 default:
2675                         goto invalid;
2676                 }
2677
2678                 break;
2679         case WLAN_CATEGORY_PUBLIC:
2680                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2681                         goto invalid;
2682                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2683                         break;
2684                 if (!rx->sta)
2685                         break;
2686                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2687                         break;
2688                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2689                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2690                         break;
2691                 if (len < offsetof(struct ieee80211_mgmt,
2692                                    u.action.u.ext_chan_switch.variable))
2693                         goto invalid;
2694                 goto queue;
2695         case WLAN_CATEGORY_VHT:
2696                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2697                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2698                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2699                     sdata->vif.type != NL80211_IFTYPE_AP &&
2700                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2701                         break;
2702
2703                 /* verify action code is present */
2704                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2705                         goto invalid;
2706
2707                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2708                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2709                         u8 opmode;
2710
2711                         /* verify opmode is present */
2712                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2713                                 goto invalid;
2714
2715                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2716
2717                         ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2718                                                     opmode, status->band,
2719                                                     false);
2720                         goto handled;
2721                 }
2722                 default:
2723                         break;
2724                 }
2725                 break;
2726         case WLAN_CATEGORY_BACK:
2727                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2728                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2729                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2730                     sdata->vif.type != NL80211_IFTYPE_AP &&
2731                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2732                         break;
2733
2734                 /* verify action_code is present */
2735                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2736                         break;
2737
2738                 switch (mgmt->u.action.u.addba_req.action_code) {
2739                 case WLAN_ACTION_ADDBA_REQ:
2740                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2741                                    sizeof(mgmt->u.action.u.addba_req)))
2742                                 goto invalid;
2743                         break;
2744                 case WLAN_ACTION_ADDBA_RESP:
2745                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2746                                    sizeof(mgmt->u.action.u.addba_resp)))
2747                                 goto invalid;
2748                         break;
2749                 case WLAN_ACTION_DELBA:
2750                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2751                                    sizeof(mgmt->u.action.u.delba)))
2752                                 goto invalid;
2753                         break;
2754                 default:
2755                         goto invalid;
2756                 }
2757
2758                 goto queue;
2759         case WLAN_CATEGORY_SPECTRUM_MGMT:
2760                 /* verify action_code is present */
2761                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2762                         break;
2763
2764                 switch (mgmt->u.action.u.measurement.action_code) {
2765                 case WLAN_ACTION_SPCT_MSR_REQ:
2766                         if (status->band != IEEE80211_BAND_5GHZ)
2767                                 break;
2768
2769                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2770                                    sizeof(mgmt->u.action.u.measurement)))
2771                                 break;
2772
2773                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2774                                 break;
2775
2776                         ieee80211_process_measurement_req(sdata, mgmt, len);
2777                         goto handled;
2778                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2779                         u8 *bssid;
2780                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2781                                    sizeof(mgmt->u.action.u.chan_switch)))
2782                                 break;
2783
2784                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2785                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2786                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2787                                 break;
2788
2789                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2790                                 bssid = sdata->u.mgd.bssid;
2791                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2792                                 bssid = sdata->u.ibss.bssid;
2793                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2794                                 bssid = mgmt->sa;
2795                         else
2796                                 break;
2797
2798                         if (!ether_addr_equal(mgmt->bssid, bssid))
2799                                 break;
2800
2801                         goto queue;
2802                         }
2803                 }
2804                 break;
2805         case WLAN_CATEGORY_SA_QUERY:
2806                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2807                            sizeof(mgmt->u.action.u.sa_query)))
2808                         break;
2809
2810                 switch (mgmt->u.action.u.sa_query.action) {
2811                 case WLAN_ACTION_SA_QUERY_REQUEST:
2812                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2813                                 break;
2814                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2815                         goto handled;
2816                 }
2817                 break;
2818         case WLAN_CATEGORY_SELF_PROTECTED:
2819                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2820                            sizeof(mgmt->u.action.u.self_prot.action_code)))
2821                         break;
2822
2823                 switch (mgmt->u.action.u.self_prot.action_code) {
2824                 case WLAN_SP_MESH_PEERING_OPEN:
2825                 case WLAN_SP_MESH_PEERING_CLOSE:
2826                 case WLAN_SP_MESH_PEERING_CONFIRM:
2827                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2828                                 goto invalid;
2829                         if (sdata->u.mesh.user_mpm)
2830                                 /* userspace handles this frame */
2831                                 break;
2832                         goto queue;
2833                 case WLAN_SP_MGK_INFORM:
2834                 case WLAN_SP_MGK_ACK:
2835                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2836                                 goto invalid;
2837                         break;
2838                 }
2839                 break;
2840         case WLAN_CATEGORY_MESH_ACTION:
2841                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2842                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
2843                         break;
2844
2845                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2846                         break;
2847                 if (mesh_action_is_path_sel(mgmt) &&
2848                     !mesh_path_sel_is_hwmp(sdata))
2849                         break;
2850                 goto queue;
2851         }
2852
2853         return RX_CONTINUE;
2854
2855  invalid:
2856         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2857         /* will return in the next handlers */
2858         return RX_CONTINUE;
2859
2860  handled:
2861         if (rx->sta)
2862                 rx->sta->rx_packets++;
2863         dev_kfree_skb(rx->skb);
2864         return RX_QUEUED;
2865
2866  queue:
2867         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2868         skb_queue_tail(&sdata->skb_queue, rx->skb);
2869         ieee80211_queue_work(&local->hw, &sdata->work);
2870         if (rx->sta)
2871                 rx->sta->rx_packets++;
2872         return RX_QUEUED;
2873 }
2874
2875 static ieee80211_rx_result debug_noinline
2876 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2877 {
2878         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2879         int sig = 0;
2880
2881         /* skip known-bad action frames and return them in the next handler */
2882         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2883                 return RX_CONTINUE;
2884
2885         /*
2886          * Getting here means the kernel doesn't know how to handle
2887          * it, but maybe userspace does ... include returned frames
2888          * so userspace can register for those to know whether ones
2889          * it transmitted were processed or returned.
2890          */
2891
2892         if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2893                 sig = status->signal;
2894
2895         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2896                              rx->skb->data, rx->skb->len, 0)) {
2897                 if (rx->sta)
2898                         rx->sta->rx_packets++;
2899                 dev_kfree_skb(rx->skb);
2900                 return RX_QUEUED;
2901         }
2902
2903         return RX_CONTINUE;
2904 }
2905
2906 static ieee80211_rx_result debug_noinline
2907 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2908 {
2909         struct ieee80211_local *local = rx->local;
2910         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2911         struct sk_buff *nskb;
2912         struct ieee80211_sub_if_data *sdata = rx->sdata;
2913         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2914
2915         if (!ieee80211_is_action(mgmt->frame_control))
2916                 return RX_CONTINUE;
2917
2918         /*
2919          * For AP mode, hostapd is responsible for handling any action
2920          * frames that we didn't handle, including returning unknown
2921          * ones. For all other modes we will return them to the sender,
2922          * setting the 0x80 bit in the action category, as required by
2923          * 802.11-2012 9.24.4.
2924          * Newer versions of hostapd shall also use the management frame
2925          * registration mechanisms, but older ones still use cooked
2926          * monitor interfaces so push all frames there.
2927          */
2928         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2929             (sdata->vif.type == NL80211_IFTYPE_AP ||
2930              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2931                 return RX_DROP_MONITOR;
2932
2933         if (is_multicast_ether_addr(mgmt->da))
2934                 return RX_DROP_MONITOR;
2935
2936         /* do not return rejected action frames */
2937         if (mgmt->u.action.category & 0x80)
2938                 return RX_DROP_UNUSABLE;
2939
2940         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2941                                GFP_ATOMIC);
2942         if (nskb) {
2943                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2944
2945                 nmgmt->u.action.category |= 0x80;
2946                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2947                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2948
2949                 memset(nskb->cb, 0, sizeof(nskb->cb));
2950
2951                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2952                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2953
2954                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2955                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2956                                       IEEE80211_TX_CTL_NO_CCK_RATE;
2957                         if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2958                                 info->hw_queue =
2959                                         local->hw.offchannel_tx_hw_queue;
2960                 }
2961
2962                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2963                                             status->band);
2964         }
2965         dev_kfree_skb(rx->skb);
2966         return RX_QUEUED;
2967 }
2968
2969 static ieee80211_rx_result debug_noinline
2970 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2971 {
2972         struct ieee80211_sub_if_data *sdata = rx->sdata;
2973         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2974         __le16 stype;
2975
2976         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2977
2978         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2979             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2980             sdata->vif.type != NL80211_IFTYPE_OCB &&
2981             sdata->vif.type != NL80211_IFTYPE_STATION)
2982                 return RX_DROP_MONITOR;
2983
2984         switch (stype) {
2985         case cpu_to_le16(IEEE80211_STYPE_AUTH):
2986         case cpu_to_le16(IEEE80211_STYPE_BEACON):
2987         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2988                 /* process for all: mesh, mlme, ibss */
2989                 break;
2990         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2991         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2992         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2993         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2994                 if (is_multicast_ether_addr(mgmt->da) &&
2995                     !is_broadcast_ether_addr(mgmt->da))
2996                         return RX_DROP_MONITOR;
2997
2998                 /* process only for station */
2999                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3000                         return RX_DROP_MONITOR;
3001                 break;
3002         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3003                 /* process only for ibss and mesh */
3004                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3005                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3006                         return RX_DROP_MONITOR;
3007                 break;
3008         default:
3009                 return RX_DROP_MONITOR;
3010         }
3011
3012         /* queue up frame and kick off work to process it */
3013         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3014         skb_queue_tail(&sdata->skb_queue, rx->skb);
3015         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3016         if (rx->sta)
3017                 rx->sta->rx_packets++;
3018
3019         return RX_QUEUED;
3020 }
3021
3022 /* TODO: use IEEE80211_RX_FRAGMENTED */
3023 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3024                                         struct ieee80211_rate *rate)
3025 {
3026         struct ieee80211_sub_if_data *sdata;
3027         struct ieee80211_local *local = rx->local;
3028         struct sk_buff *skb = rx->skb, *skb2;
3029         struct net_device *prev_dev = NULL;
3030         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3031         int needed_headroom;
3032
3033         /*
3034          * If cooked monitor has been processed already, then
3035          * don't do it again. If not, set the flag.
3036          */
3037         if (rx->flags & IEEE80211_RX_CMNTR)
3038                 goto out_free_skb;
3039         rx->flags |= IEEE80211_RX_CMNTR;
3040
3041         /* If there are no cooked monitor interfaces, just free the SKB */
3042         if (!local->cooked_mntrs)
3043                 goto out_free_skb;
3044
3045         /* vendor data is long removed here */
3046         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3047         /* room for the radiotap header based on driver features */
3048         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3049
3050         if (skb_headroom(skb) < needed_headroom &&
3051             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3052                 goto out_free_skb;
3053
3054         /* prepend radiotap information */
3055         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3056                                          false);
3057
3058         skb_set_mac_header(skb, 0);
3059         skb->ip_summed = CHECKSUM_UNNECESSARY;
3060         skb->pkt_type = PACKET_OTHERHOST;
3061         skb->protocol = htons(ETH_P_802_2);
3062
3063         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3064                 if (!ieee80211_sdata_running(sdata))
3065                         continue;
3066
3067                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3068                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
3069                         continue;
3070
3071                 if (prev_dev) {
3072                         skb2 = skb_clone(skb, GFP_ATOMIC);
3073                         if (skb2) {
3074                                 skb2->dev = prev_dev;
3075                                 netif_receive_skb(skb2);
3076                         }
3077                 }
3078
3079                 prev_dev = sdata->dev;
3080                 sdata->dev->stats.rx_packets++;
3081                 sdata->dev->stats.rx_bytes += skb->len;
3082         }
3083
3084         if (prev_dev) {
3085                 skb->dev = prev_dev;
3086                 netif_receive_skb(skb);
3087                 return;
3088         }
3089
3090  out_free_skb:
3091         dev_kfree_skb(skb);
3092 }
3093
3094 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3095                                          ieee80211_rx_result res)
3096 {
3097         switch (res) {
3098         case RX_DROP_MONITOR:
3099                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3100                 if (rx->sta)
3101                         rx->sta->rx_dropped++;
3102                 /* fall through */
3103         case RX_CONTINUE: {
3104                 struct ieee80211_rate *rate = NULL;
3105                 struct ieee80211_supported_band *sband;
3106                 struct ieee80211_rx_status *status;
3107
3108                 status = IEEE80211_SKB_RXCB((rx->skb));
3109
3110                 sband = rx->local->hw.wiphy->bands[status->band];
3111                 if (!(status->flag & RX_FLAG_HT) &&
3112                     !(status->flag & RX_FLAG_VHT))
3113                         rate = &sband->bitrates[status->rate_idx];
3114
3115                 ieee80211_rx_cooked_monitor(rx, rate);
3116                 break;
3117                 }
3118         case RX_DROP_UNUSABLE:
3119                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3120                 if (rx->sta)
3121                         rx->sta->rx_dropped++;
3122                 dev_kfree_skb(rx->skb);
3123                 break;
3124         case RX_QUEUED:
3125                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3126                 break;
3127         }
3128 }
3129
3130 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3131                                   struct sk_buff_head *frames)
3132 {
3133         ieee80211_rx_result res = RX_DROP_MONITOR;
3134         struct sk_buff *skb;
3135
3136 #define CALL_RXH(rxh)                   \
3137         do {                            \
3138                 res = rxh(rx);          \
3139                 if (res != RX_CONTINUE) \
3140                         goto rxh_next;  \
3141         } while (0);
3142
3143         /* Lock here to avoid hitting all of the data used in the RX
3144          * path (e.g. key data, station data, ...) concurrently when
3145          * a frame is released from the reorder buffer due to timeout
3146          * from the timer, potentially concurrently with RX from the
3147          * driver.
3148          */
3149         spin_lock_bh(&rx->local->rx_path_lock);
3150
3151         while ((skb = __skb_dequeue(frames))) {
3152                 /*
3153                  * all the other fields are valid across frames
3154                  * that belong to an aMPDU since they are on the
3155                  * same TID from the same station
3156                  */
3157                 rx->skb = skb;
3158
3159                 CALL_RXH(ieee80211_rx_h_check_more_data)
3160                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
3161                 CALL_RXH(ieee80211_rx_h_sta_process)
3162                 CALL_RXH(ieee80211_rx_h_decrypt)
3163                 CALL_RXH(ieee80211_rx_h_defragment)
3164                 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
3165                 /* must be after MMIC verify so header is counted in MPDU mic */
3166 #ifdef CONFIG_MAC80211_MESH
3167                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3168                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3169 #endif
3170                 CALL_RXH(ieee80211_rx_h_amsdu)
3171                 CALL_RXH(ieee80211_rx_h_data)
3172
3173                 /* special treatment -- needs the queue */
3174                 res = ieee80211_rx_h_ctrl(rx, frames);
3175                 if (res != RX_CONTINUE)
3176                         goto rxh_next;
3177
3178                 CALL_RXH(ieee80211_rx_h_mgmt_check)
3179                 CALL_RXH(ieee80211_rx_h_action)
3180                 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
3181                 CALL_RXH(ieee80211_rx_h_action_return)
3182                 CALL_RXH(ieee80211_rx_h_mgmt)
3183
3184  rxh_next:
3185                 ieee80211_rx_handlers_result(rx, res);
3186
3187 #undef CALL_RXH
3188         }
3189
3190         spin_unlock_bh(&rx->local->rx_path_lock);
3191 }
3192
3193 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3194 {
3195         struct sk_buff_head reorder_release;
3196         ieee80211_rx_result res = RX_DROP_MONITOR;
3197
3198         __skb_queue_head_init(&reorder_release);
3199
3200 #define CALL_RXH(rxh)                   \
3201         do {                            \
3202                 res = rxh(rx);          \
3203                 if (res != RX_CONTINUE) \
3204                         goto rxh_next;  \
3205         } while (0);
3206
3207         CALL_RXH(ieee80211_rx_h_check_dup)
3208         CALL_RXH(ieee80211_rx_h_check)
3209
3210         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3211
3212         ieee80211_rx_handlers(rx, &reorder_release);
3213         return;
3214
3215  rxh_next:
3216         ieee80211_rx_handlers_result(rx, res);
3217
3218 #undef CALL_RXH
3219 }
3220
3221 /*
3222  * This function makes calls into the RX path, therefore
3223  * it has to be invoked under RCU read lock.
3224  */
3225 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3226 {
3227         struct sk_buff_head frames;
3228         struct ieee80211_rx_data rx = {
3229                 .sta = sta,
3230                 .sdata = sta->sdata,
3231                 .local = sta->local,
3232                 /* This is OK -- must be QoS data frame */
3233                 .security_idx = tid,
3234                 .seqno_idx = tid,
3235                 .flags = IEEE80211_RX_REORDER_TIMER,
3236         };
3237         struct tid_ampdu_rx *tid_agg_rx;
3238
3239         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3240         if (!tid_agg_rx)
3241                 return;
3242
3243         __skb_queue_head_init(&frames);
3244
3245         spin_lock(&tid_agg_rx->reorder_lock);
3246         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3247         spin_unlock(&tid_agg_rx->reorder_lock);
3248
3249         ieee80211_rx_handlers(&rx, &frames);
3250 }
3251
3252 /* main receive path */
3253
3254 static bool prepare_for_handlers(struct ieee80211_rx_data *rx,
3255                                  struct ieee80211_hdr *hdr)
3256 {
3257         struct ieee80211_sub_if_data *sdata = rx->sdata;
3258         struct sk_buff *skb = rx->skb;
3259         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3260         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3261         int multicast = is_multicast_ether_addr(hdr->addr1);
3262
3263         switch (sdata->vif.type) {
3264         case NL80211_IFTYPE_STATION:
3265                 if (!bssid && !sdata->u.mgd.use_4addr)
3266                         return false;
3267                 if (!multicast &&
3268                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3269                         if (!(sdata->dev->flags & IFF_PROMISC) ||
3270                             sdata->u.mgd.use_4addr)
3271                                 return false;
3272                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3273                 }
3274                 break;
3275         case NL80211_IFTYPE_ADHOC:
3276                 if (!bssid)
3277                         return false;
3278                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3279                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3280                         return false;
3281                 if (ieee80211_is_beacon(hdr->frame_control)) {
3282                         return true;
3283                 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3284                         return false;
3285                 } else if (!multicast &&
3286                            !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3287                         if (!(sdata->dev->flags & IFF_PROMISC))
3288                                 return false;
3289                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3290                 } else if (!rx->sta) {
3291                         int rate_idx;
3292                         if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3293                                 rate_idx = 0; /* TODO: HT/VHT rates */
3294                         else
3295                                 rate_idx = status->rate_idx;
3296                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3297                                                  BIT(rate_idx));
3298                 }
3299                 break;
3300         case NL80211_IFTYPE_OCB:
3301                 if (!bssid)
3302                         return false;
3303                 if (ieee80211_is_beacon(hdr->frame_control)) {
3304                         return false;
3305                 } else if (!is_broadcast_ether_addr(bssid)) {
3306                         ocb_dbg(sdata, "BSSID mismatch in OCB mode!\n");
3307                         return false;
3308                 } else if (!multicast &&
3309                            !ether_addr_equal(sdata->dev->dev_addr,
3310                                              hdr->addr1)) {
3311                         /* if we are in promisc mode we also accept
3312                          * packets not destined for us
3313                          */
3314                         if (!(sdata->dev->flags & IFF_PROMISC))
3315                                 return false;
3316                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
3317                 } else if (!rx->sta) {
3318                         int rate_idx;
3319                         if (status->flag & RX_FLAG_HT)
3320                                 rate_idx = 0; /* TODO: HT rates */
3321                         else
3322                                 rate_idx = status->rate_idx;
3323                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3324                                                 BIT(rate_idx));
3325                 }
3326                 break;
3327         case NL80211_IFTYPE_MESH_POINT:
3328                 if (!multicast &&
3329                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3330                         if (!(sdata->dev->flags & IFF_PROMISC))
3331                                 return false;
3332
3333                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3334                 }
3335                 break;
3336         case NL80211_IFTYPE_AP_VLAN:
3337         case NL80211_IFTYPE_AP:
3338                 if (!bssid) {
3339                         if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3340                                 return false;
3341                 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3342                         /*
3343                          * Accept public action frames even when the
3344                          * BSSID doesn't match, this is used for P2P
3345                          * and location updates. Note that mac80211
3346                          * itself never looks at these frames.
3347                          */
3348                         if (!multicast &&
3349                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3350                                 return false;
3351                         if (ieee80211_is_public_action(hdr, skb->len))
3352                                 return true;
3353                         if (!ieee80211_is_beacon(hdr->frame_control))
3354                                 return false;
3355                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3356                 } else if (!ieee80211_has_tods(hdr->frame_control)) {
3357                         /* ignore data frames to TDLS-peers */
3358                         if (ieee80211_is_data(hdr->frame_control))
3359                                 return false;
3360                         /* ignore action frames to TDLS-peers */
3361                         if (ieee80211_is_action(hdr->frame_control) &&
3362                             !ether_addr_equal(bssid, hdr->addr1))
3363                                 return false;
3364                 }
3365                 break;
3366         case NL80211_IFTYPE_WDS:
3367                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3368                         return false;
3369                 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3370                         return false;
3371                 break;
3372         case NL80211_IFTYPE_P2P_DEVICE:
3373                 if (!ieee80211_is_public_action(hdr, skb->len) &&
3374                     !ieee80211_is_probe_req(hdr->frame_control) &&
3375                     !ieee80211_is_probe_resp(hdr->frame_control) &&
3376                     !ieee80211_is_beacon(hdr->frame_control))
3377                         return false;
3378                 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3379                     !multicast)
3380                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3381                 break;
3382         default:
3383                 /* should never get here */
3384                 WARN_ON_ONCE(1);
3385                 break;
3386         }
3387
3388         return true;
3389 }
3390
3391 /*
3392  * This function returns whether or not the SKB
3393  * was destined for RX processing or not, which,
3394  * if consume is true, is equivalent to whether
3395  * or not the skb was consumed.
3396  */
3397 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3398                                             struct sk_buff *skb, bool consume)
3399 {
3400         struct ieee80211_local *local = rx->local;
3401         struct ieee80211_sub_if_data *sdata = rx->sdata;
3402         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3403         struct ieee80211_hdr *hdr = (void *)skb->data;
3404
3405         rx->skb = skb;
3406         status->rx_flags |= IEEE80211_RX_RA_MATCH;
3407
3408         if (!prepare_for_handlers(rx, hdr))
3409                 return false;
3410
3411         if (!consume) {
3412                 skb = skb_copy(skb, GFP_ATOMIC);
3413                 if (!skb) {
3414                         if (net_ratelimit())
3415                                 wiphy_debug(local->hw.wiphy,
3416                                         "failed to copy skb for %s\n",
3417                                         sdata->name);
3418                         return true;
3419                 }
3420
3421                 rx->skb = skb;
3422         }
3423
3424         ieee80211_invoke_rx_handlers(rx);
3425         return true;
3426 }
3427
3428 /*
3429  * This is the actual Rx frames handler. as it belongs to Rx path it must
3430  * be called with rcu_read_lock protection.
3431  */
3432 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3433                                          struct sk_buff *skb)
3434 {
3435         struct ieee80211_local *local = hw_to_local(hw);
3436         struct ieee80211_sub_if_data *sdata;
3437         struct ieee80211_hdr *hdr;
3438         __le16 fc;
3439         struct ieee80211_rx_data rx;
3440         struct ieee80211_sub_if_data *prev;
3441         struct sta_info *sta, *prev_sta;
3442         struct rhash_head *tmp;
3443         int err = 0;
3444
3445         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3446         memset(&rx, 0, sizeof(rx));
3447         rx.skb = skb;
3448         rx.local = local;
3449
3450         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3451                 local->dot11ReceivedFragmentCount++;
3452
3453         if (ieee80211_is_mgmt(fc)) {
3454                 /* drop frame if too short for header */
3455                 if (skb->len < ieee80211_hdrlen(fc))
3456                         err = -ENOBUFS;
3457                 else
3458                         err = skb_linearize(skb);
3459         } else {
3460                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3461         }
3462
3463         if (err) {
3464                 dev_kfree_skb(skb);
3465                 return;
3466         }
3467
3468         hdr = (struct ieee80211_hdr *)skb->data;
3469         ieee80211_parse_qos(&rx);
3470         ieee80211_verify_alignment(&rx);
3471
3472         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3473                      ieee80211_is_beacon(hdr->frame_control)))
3474                 ieee80211_scan_rx(local, skb);
3475
3476         if (ieee80211_is_data(fc)) {
3477                 const struct bucket_table *tbl;
3478
3479                 prev_sta = NULL;
3480
3481                 tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
3482
3483                 for_each_sta_info(local, tbl, hdr->addr2, sta, tmp) {
3484                         if (!prev_sta) {
3485                                 prev_sta = sta;
3486                                 continue;
3487                         }
3488
3489                         rx.sta = prev_sta;
3490                         rx.sdata = prev_sta->sdata;
3491                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
3492
3493                         prev_sta = sta;
3494                 }
3495
3496                 if (prev_sta) {
3497                         rx.sta = prev_sta;
3498                         rx.sdata = prev_sta->sdata;
3499
3500                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3501                                 return;
3502                         goto out;
3503                 }
3504         }
3505
3506         prev = NULL;
3507
3508         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3509                 if (!ieee80211_sdata_running(sdata))
3510                         continue;
3511
3512                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3513                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3514                         continue;
3515
3516                 /*
3517                  * frame is destined for this interface, but if it's
3518                  * not also for the previous one we handle that after
3519                  * the loop to avoid copying the SKB once too much
3520                  */
3521
3522                 if (!prev) {
3523                         prev = sdata;
3524                         continue;
3525                 }
3526
3527                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3528                 rx.sdata = prev;
3529                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3530
3531                 prev = sdata;
3532         }
3533
3534         if (prev) {
3535                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3536                 rx.sdata = prev;
3537
3538                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3539                         return;
3540         }
3541
3542  out:
3543         dev_kfree_skb(skb);
3544 }
3545
3546 /*
3547  * This is the receive path handler. It is called by a low level driver when an
3548  * 802.11 MPDU is received from the hardware.
3549  */
3550 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3551 {
3552         struct ieee80211_local *local = hw_to_local(hw);
3553         struct ieee80211_rate *rate = NULL;
3554         struct ieee80211_supported_band *sband;
3555         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3556
3557         WARN_ON_ONCE(softirq_count() == 0);
3558
3559         if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3560                 goto drop;
3561
3562         sband = local->hw.wiphy->bands[status->band];
3563         if (WARN_ON(!sband))
3564                 goto drop;
3565
3566         /*
3567          * If we're suspending, it is possible although not too likely
3568          * that we'd be receiving frames after having already partially
3569          * quiesced the stack. We can't process such frames then since
3570          * that might, for example, cause stations to be added or other
3571          * driver callbacks be invoked.
3572          */
3573         if (unlikely(local->quiescing || local->suspended))
3574                 goto drop;
3575
3576         /* We might be during a HW reconfig, prevent Rx for the same reason */
3577         if (unlikely(local->in_reconfig))
3578                 goto drop;
3579
3580         /*
3581          * The same happens when we're not even started,
3582          * but that's worth a warning.
3583          */
3584         if (WARN_ON(!local->started))
3585                 goto drop;
3586
3587         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3588                 /*
3589                  * Validate the rate, unless a PLCP error means that
3590                  * we probably can't have a valid rate here anyway.
3591                  */
3592
3593                 if (status->flag & RX_FLAG_HT) {
3594                         /*
3595                          * rate_idx is MCS index, which can be [0-76]
3596                          * as documented on:
3597                          *
3598                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3599                          *
3600                          * Anything else would be some sort of driver or
3601                          * hardware error. The driver should catch hardware
3602                          * errors.
3603                          */
3604                         if (WARN(status->rate_idx > 76,
3605                                  "Rate marked as an HT rate but passed "
3606                                  "status->rate_idx is not "
3607                                  "an MCS index [0-76]: %d (0x%02x)\n",
3608                                  status->rate_idx,
3609                                  status->rate_idx))
3610                                 goto drop;
3611                 } else if (status->flag & RX_FLAG_VHT) {
3612                         if (WARN_ONCE(status->rate_idx > 9 ||
3613                                       !status->vht_nss ||
3614                                       status->vht_nss > 8,
3615                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3616                                       status->rate_idx, status->vht_nss))
3617                                 goto drop;
3618                 } else {
3619                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3620                                 goto drop;
3621                         rate = &sband->bitrates[status->rate_idx];
3622                 }
3623         }
3624
3625         status->rx_flags = 0;
3626
3627         /*
3628          * key references and virtual interfaces are protected using RCU
3629          * and this requires that we are in a read-side RCU section during
3630          * receive processing
3631          */
3632         rcu_read_lock();
3633
3634         /*
3635          * Frames with failed FCS/PLCP checksum are not returned,
3636          * all other frames are returned without radiotap header
3637          * if it was previously present.
3638          * Also, frames with less than 16 bytes are dropped.
3639          */
3640         skb = ieee80211_rx_monitor(local, skb, rate);
3641         if (!skb) {
3642                 rcu_read_unlock();
3643                 return;
3644         }
3645
3646         ieee80211_tpt_led_trig_rx(local,
3647                         ((struct ieee80211_hdr *)skb->data)->frame_control,
3648                         skb->len);
3649         __ieee80211_rx_handle_packet(hw, skb);
3650
3651         rcu_read_unlock();
3652
3653         return;
3654  drop:
3655         kfree_skb(skb);
3656 }
3657 EXPORT_SYMBOL(ieee80211_rx);
3658
3659 /* This is a version of the rx handler that can be called from hard irq
3660  * context. Post the skb on the queue and schedule the tasklet */
3661 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3662 {
3663         struct ieee80211_local *local = hw_to_local(hw);
3664
3665         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3666
3667         skb->pkt_type = IEEE80211_RX_MSG;
3668         skb_queue_tail(&local->skb_queue, skb);
3669         tasklet_schedule(&local->tasklet);
3670 }
3671 EXPORT_SYMBOL(ieee80211_rx_irqsafe);