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
1189         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1190             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1191                 ps = &sdata->bss->ps;
1192         else
1193                 return;
1194
1195         atomic_inc(&ps->num_sta_ps);
1196         set_sta_flag(sta, WLAN_STA_PS_STA);
1197         if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1198                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1199         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1200                sta->sta.addr, sta->sta.aid);
1201 }
1202
1203 static void sta_ps_end(struct sta_info *sta)
1204 {
1205         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1206                sta->sta.addr, sta->sta.aid);
1207
1208         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1209                 /*
1210                  * Clear the flag only if the other one is still set
1211                  * so that the TX path won't start TX'ing new frames
1212                  * directly ... In the case that the driver flag isn't
1213                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1214                  */
1215                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1216                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1217                        sta->sta.addr, sta->sta.aid);
1218                 return;
1219         }
1220
1221         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1222         clear_sta_flag(sta, WLAN_STA_PS_STA);
1223         ieee80211_sta_ps_deliver_wakeup(sta);
1224 }
1225
1226 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1227 {
1228         struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1229         bool in_ps;
1230
1231         WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1232
1233         /* Don't let the same PS state be set twice */
1234         in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1235         if ((start && in_ps) || (!start && !in_ps))
1236                 return -EINVAL;
1237
1238         if (start)
1239                 sta_ps_start(sta_inf);
1240         else
1241                 sta_ps_end(sta_inf);
1242
1243         return 0;
1244 }
1245 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1246
1247 static ieee80211_rx_result debug_noinline
1248 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1249 {
1250         struct ieee80211_sub_if_data *sdata = rx->sdata;
1251         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1252         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1253         int tid, ac;
1254
1255         if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1256                 return RX_CONTINUE;
1257
1258         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1259             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1260                 return RX_CONTINUE;
1261
1262         /*
1263          * The device handles station powersave, so don't do anything about
1264          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1265          * it to mac80211 since they're handled.)
1266          */
1267         if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1268                 return RX_CONTINUE;
1269
1270         /*
1271          * Don't do anything if the station isn't already asleep. In
1272          * the uAPSD case, the station will probably be marked asleep,
1273          * in the PS-Poll case the station must be confused ...
1274          */
1275         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1276                 return RX_CONTINUE;
1277
1278         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1279                 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1280                         if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1281                                 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1282                         else
1283                                 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1284                 }
1285
1286                 /* Free PS Poll skb here instead of returning RX_DROP that would
1287                  * count as an dropped frame. */
1288                 dev_kfree_skb(rx->skb);
1289
1290                 return RX_QUEUED;
1291         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1292                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1293                    ieee80211_has_pm(hdr->frame_control) &&
1294                    (ieee80211_is_data_qos(hdr->frame_control) ||
1295                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1296                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1297                 ac = ieee802_1d_to_ac[tid & 7];
1298
1299                 /*
1300                  * If this AC is not trigger-enabled do nothing.
1301                  *
1302                  * NB: This could/should check a separate bitmap of trigger-
1303                  * enabled queues, but for now we only implement uAPSD w/o
1304                  * TSPEC changes to the ACs, so they're always the same.
1305                  */
1306                 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1307                         return RX_CONTINUE;
1308
1309                 /* if we are in a service period, do nothing */
1310                 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1311                         return RX_CONTINUE;
1312
1313                 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1314                         ieee80211_sta_ps_deliver_uapsd(rx->sta);
1315                 else
1316                         set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1317         }
1318
1319         return RX_CONTINUE;
1320 }
1321
1322 static ieee80211_rx_result debug_noinline
1323 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1324 {
1325         struct sta_info *sta = rx->sta;
1326         struct sk_buff *skb = rx->skb;
1327         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1328         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1329         int i;
1330
1331         if (!sta)
1332                 return RX_CONTINUE;
1333
1334         /*
1335          * Update last_rx only for IBSS packets which are for the current
1336          * BSSID and for station already AUTHORIZED to avoid keeping the
1337          * current IBSS network alive in cases where other STAs start
1338          * using different BSSID. This will also give the station another
1339          * chance to restart the authentication/authorization in case
1340          * something went wrong the first time.
1341          */
1342         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1343                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1344                                                 NL80211_IFTYPE_ADHOC);
1345                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1346                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1347                         sta->last_rx = jiffies;
1348                         if (ieee80211_is_data(hdr->frame_control) &&
1349                             !is_multicast_ether_addr(hdr->addr1)) {
1350                                 sta->last_rx_rate_idx = status->rate_idx;
1351                                 sta->last_rx_rate_flag = status->flag;
1352                                 sta->last_rx_rate_vht_flag = status->vht_flag;
1353                                 sta->last_rx_rate_vht_nss = status->vht_nss;
1354                         }
1355                 }
1356         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1357                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1358                                                 NL80211_IFTYPE_OCB);
1359                 /* OCB uses wild-card BSSID */
1360                 if (is_broadcast_ether_addr(bssid))
1361                         sta->last_rx = jiffies;
1362         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1363                 /*
1364                  * Mesh beacons will update last_rx when if they are found to
1365                  * match the current local configuration when processed.
1366                  */
1367                 sta->last_rx = jiffies;
1368                 if (ieee80211_is_data(hdr->frame_control)) {
1369                         sta->last_rx_rate_idx = status->rate_idx;
1370                         sta->last_rx_rate_flag = status->flag;
1371                         sta->last_rx_rate_vht_flag = status->vht_flag;
1372                         sta->last_rx_rate_vht_nss = status->vht_nss;
1373                 }
1374         }
1375
1376         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1377                 return RX_CONTINUE;
1378
1379         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1380                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1381
1382         sta->rx_fragments++;
1383         sta->rx_bytes += rx->skb->len;
1384         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1385                 sta->last_signal = status->signal;
1386                 ewma_add(&sta->avg_signal, -status->signal);
1387         }
1388
1389         if (status->chains) {
1390                 sta->chains = status->chains;
1391                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1392                         int signal = status->chain_signal[i];
1393
1394                         if (!(status->chains & BIT(i)))
1395                                 continue;
1396
1397                         sta->chain_signal_last[i] = signal;
1398                         ewma_add(&sta->chain_signal_avg[i], -signal);
1399                 }
1400         }
1401
1402         /*
1403          * Change STA power saving mode only at the end of a frame
1404          * exchange sequence.
1405          */
1406         if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1407             !ieee80211_has_morefrags(hdr->frame_control) &&
1408             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1409             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1410              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1411             /* PM bit is only checked in frames where it isn't reserved,
1412              * in AP mode it's reserved in non-bufferable management frames
1413              * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1414              */
1415             (!ieee80211_is_mgmt(hdr->frame_control) ||
1416              ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1417                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1418                         if (!ieee80211_has_pm(hdr->frame_control))
1419                                 sta_ps_end(sta);
1420                 } else {
1421                         if (ieee80211_has_pm(hdr->frame_control))
1422                                 sta_ps_start(sta);
1423                 }
1424         }
1425
1426         /* mesh power save support */
1427         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1428                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1429
1430         /*
1431          * Drop (qos-)data::nullfunc frames silently, since they
1432          * are used only to control station power saving mode.
1433          */
1434         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1435             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1436                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1437
1438                 /*
1439                  * If we receive a 4-addr nullfunc frame from a STA
1440                  * that was not moved to a 4-addr STA vlan yet send
1441                  * the event to userspace and for older hostapd drop
1442                  * the frame to the monitor interface.
1443                  */
1444                 if (ieee80211_has_a4(hdr->frame_control) &&
1445                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1446                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1447                       !rx->sdata->u.vlan.sta))) {
1448                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1449                                 cfg80211_rx_unexpected_4addr_frame(
1450                                         rx->sdata->dev, sta->sta.addr,
1451                                         GFP_ATOMIC);
1452                         return RX_DROP_MONITOR;
1453                 }
1454                 /*
1455                  * Update counter and free packet here to avoid
1456                  * counting this as a dropped packed.
1457                  */
1458                 sta->rx_packets++;
1459                 dev_kfree_skb(rx->skb);
1460                 return RX_QUEUED;
1461         }
1462
1463         return RX_CONTINUE;
1464 } /* ieee80211_rx_h_sta_process */
1465
1466 static ieee80211_rx_result debug_noinline
1467 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1468 {
1469         struct sk_buff *skb = rx->skb;
1470         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1471         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1472         int keyidx;
1473         int hdrlen;
1474         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1475         struct ieee80211_key *sta_ptk = NULL;
1476         int mmie_keyidx = -1;
1477         __le16 fc;
1478         const struct ieee80211_cipher_scheme *cs = NULL;
1479
1480         /*
1481          * Key selection 101
1482          *
1483          * There are four types of keys:
1484          *  - GTK (group keys)
1485          *  - IGTK (group keys for management frames)
1486          *  - PTK (pairwise keys)
1487          *  - STK (station-to-station pairwise keys)
1488          *
1489          * When selecting a key, we have to distinguish between multicast
1490          * (including broadcast) and unicast frames, the latter can only
1491          * use PTKs and STKs while the former always use GTKs and IGTKs.
1492          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1493          * unicast frames can also use key indices like GTKs. Hence, if we
1494          * don't have a PTK/STK we check the key index for a WEP key.
1495          *
1496          * Note that in a regular BSS, multicast frames are sent by the
1497          * AP only, associated stations unicast the frame to the AP first
1498          * which then multicasts it on their behalf.
1499          *
1500          * There is also a slight problem in IBSS mode: GTKs are negotiated
1501          * with each station, that is something we don't currently handle.
1502          * The spec seems to expect that one negotiates the same key with
1503          * every station but there's no such requirement; VLANs could be
1504          * possible.
1505          */
1506
1507         /*
1508          * No point in finding a key and decrypting if the frame is neither
1509          * addressed to us nor a multicast frame.
1510          */
1511         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1512                 return RX_CONTINUE;
1513
1514         /* start without a key */
1515         rx->key = NULL;
1516         fc = hdr->frame_control;
1517
1518         if (rx->sta) {
1519                 int keyid = rx->sta->ptk_idx;
1520
1521                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1522                         cs = rx->sta->cipher_scheme;
1523                         keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1524                         if (unlikely(keyid < 0))
1525                                 return RX_DROP_UNUSABLE;
1526                 }
1527                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1528         }
1529
1530         if (!ieee80211_has_protected(fc))
1531                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1532
1533         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1534                 rx->key = sta_ptk;
1535                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1536                     (status->flag & RX_FLAG_IV_STRIPPED))
1537                         return RX_CONTINUE;
1538                 /* Skip decryption if the frame is not protected. */
1539                 if (!ieee80211_has_protected(fc))
1540                         return RX_CONTINUE;
1541         } else if (mmie_keyidx >= 0) {
1542                 /* Broadcast/multicast robust management frame / BIP */
1543                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1544                     (status->flag & RX_FLAG_IV_STRIPPED))
1545                         return RX_CONTINUE;
1546
1547                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1548                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1549                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1550                 if (rx->sta)
1551                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1552                 if (!rx->key)
1553                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1554         } else if (!ieee80211_has_protected(fc)) {
1555                 /*
1556                  * The frame was not protected, so skip decryption. However, we
1557                  * need to set rx->key if there is a key that could have been
1558                  * used so that the frame may be dropped if encryption would
1559                  * have been expected.
1560                  */
1561                 struct ieee80211_key *key = NULL;
1562                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1563                 int i;
1564
1565                 if (ieee80211_is_mgmt(fc) &&
1566                     is_multicast_ether_addr(hdr->addr1) &&
1567                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1568                         rx->key = key;
1569                 else {
1570                         if (rx->sta) {
1571                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1572                                         key = rcu_dereference(rx->sta->gtk[i]);
1573                                         if (key)
1574                                                 break;
1575                                 }
1576                         }
1577                         if (!key) {
1578                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1579                                         key = rcu_dereference(sdata->keys[i]);
1580                                         if (key)
1581                                                 break;
1582                                 }
1583                         }
1584                         if (key)
1585                                 rx->key = key;
1586                 }
1587                 return RX_CONTINUE;
1588         } else {
1589                 u8 keyid;
1590
1591                 /*
1592                  * The device doesn't give us the IV so we won't be
1593                  * able to look up the key. That's ok though, we
1594                  * don't need to decrypt the frame, we just won't
1595                  * be able to keep statistics accurate.
1596                  * Except for key threshold notifications, should
1597                  * we somehow allow the driver to tell us which key
1598                  * the hardware used if this flag is set?
1599                  */
1600                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1601                     (status->flag & RX_FLAG_IV_STRIPPED))
1602                         return RX_CONTINUE;
1603
1604                 hdrlen = ieee80211_hdrlen(fc);
1605
1606                 if (cs) {
1607                         keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
1608
1609                         if (unlikely(keyidx < 0))
1610                                 return RX_DROP_UNUSABLE;
1611                 } else {
1612                         if (rx->skb->len < 8 + hdrlen)
1613                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1614                         /*
1615                          * no need to call ieee80211_wep_get_keyidx,
1616                          * it verifies a bunch of things we've done already
1617                          */
1618                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1619                         keyidx = keyid >> 6;
1620                 }
1621
1622                 /* check per-station GTK first, if multicast packet */
1623                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1624                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1625
1626                 /* if not found, try default key */
1627                 if (!rx->key) {
1628                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1629
1630                         /*
1631                          * RSNA-protected unicast frames should always be
1632                          * sent with pairwise or station-to-station keys,
1633                          * but for WEP we allow using a key index as well.
1634                          */
1635                         if (rx->key &&
1636                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1637                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1638                             !is_multicast_ether_addr(hdr->addr1))
1639                                 rx->key = NULL;
1640                 }
1641         }
1642
1643         if (rx->key) {
1644                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1645                         return RX_DROP_MONITOR;
1646
1647                 rx->key->tx_rx_count++;
1648                 /* TODO: add threshold stuff again */
1649         } else {
1650                 return RX_DROP_MONITOR;
1651         }
1652
1653         switch (rx->key->conf.cipher) {
1654         case WLAN_CIPHER_SUITE_WEP40:
1655         case WLAN_CIPHER_SUITE_WEP104:
1656                 result = ieee80211_crypto_wep_decrypt(rx);
1657                 break;
1658         case WLAN_CIPHER_SUITE_TKIP:
1659                 result = ieee80211_crypto_tkip_decrypt(rx);
1660                 break;
1661         case WLAN_CIPHER_SUITE_CCMP:
1662                 result = ieee80211_crypto_ccmp_decrypt(
1663                         rx, IEEE80211_CCMP_MIC_LEN);
1664                 break;
1665         case WLAN_CIPHER_SUITE_CCMP_256:
1666                 result = ieee80211_crypto_ccmp_decrypt(
1667                         rx, IEEE80211_CCMP_256_MIC_LEN);
1668                 break;
1669         case WLAN_CIPHER_SUITE_AES_CMAC:
1670                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1671                 break;
1672         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1673                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1674                 break;
1675         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1676         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1677                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1678                 break;
1679         case WLAN_CIPHER_SUITE_GCMP:
1680         case WLAN_CIPHER_SUITE_GCMP_256:
1681                 result = ieee80211_crypto_gcmp_decrypt(rx);
1682                 break;
1683         default:
1684                 result = ieee80211_crypto_hw_decrypt(rx);
1685         }
1686
1687         /* the hdr variable is invalid after the decrypt handlers */
1688
1689         /* either the frame has been decrypted or will be dropped */
1690         status->flag |= RX_FLAG_DECRYPTED;
1691
1692         return result;
1693 }
1694
1695 static inline struct ieee80211_fragment_entry *
1696 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1697                          unsigned int frag, unsigned int seq, int rx_queue,
1698                          struct sk_buff **skb)
1699 {
1700         struct ieee80211_fragment_entry *entry;
1701
1702         entry = &sdata->fragments[sdata->fragment_next++];
1703         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1704                 sdata->fragment_next = 0;
1705
1706         if (!skb_queue_empty(&entry->skb_list))
1707                 __skb_queue_purge(&entry->skb_list);
1708
1709         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1710         *skb = NULL;
1711         entry->first_frag_time = jiffies;
1712         entry->seq = seq;
1713         entry->rx_queue = rx_queue;
1714         entry->last_frag = frag;
1715         entry->ccmp = 0;
1716         entry->extra_len = 0;
1717
1718         return entry;
1719 }
1720
1721 static inline struct ieee80211_fragment_entry *
1722 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1723                           unsigned int frag, unsigned int seq,
1724                           int rx_queue, struct ieee80211_hdr *hdr)
1725 {
1726         struct ieee80211_fragment_entry *entry;
1727         int i, idx;
1728
1729         idx = sdata->fragment_next;
1730         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1731                 struct ieee80211_hdr *f_hdr;
1732
1733                 idx--;
1734                 if (idx < 0)
1735                         idx = IEEE80211_FRAGMENT_MAX - 1;
1736
1737                 entry = &sdata->fragments[idx];
1738                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1739                     entry->rx_queue != rx_queue ||
1740                     entry->last_frag + 1 != frag)
1741                         continue;
1742
1743                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1744
1745                 /*
1746                  * Check ftype and addresses are equal, else check next fragment
1747                  */
1748                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1749                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1750                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1751                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1752                         continue;
1753
1754                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1755                         __skb_queue_purge(&entry->skb_list);
1756                         continue;
1757                 }
1758                 return entry;
1759         }
1760
1761         return NULL;
1762 }
1763
1764 static ieee80211_rx_result debug_noinline
1765 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1766 {
1767         struct ieee80211_hdr *hdr;
1768         u16 sc;
1769         __le16 fc;
1770         unsigned int frag, seq;
1771         struct ieee80211_fragment_entry *entry;
1772         struct sk_buff *skb;
1773         struct ieee80211_rx_status *status;
1774
1775         hdr = (struct ieee80211_hdr *)rx->skb->data;
1776         fc = hdr->frame_control;
1777
1778         if (ieee80211_is_ctl(fc))
1779                 return RX_CONTINUE;
1780
1781         sc = le16_to_cpu(hdr->seq_ctrl);
1782         frag = sc & IEEE80211_SCTL_FRAG;
1783
1784         if (is_multicast_ether_addr(hdr->addr1)) {
1785                 rx->local->dot11MulticastReceivedFrameCount++;
1786                 goto out_no_led;
1787         }
1788
1789         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1790                 goto out;
1791
1792         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1793
1794         if (skb_linearize(rx->skb))
1795                 return RX_DROP_UNUSABLE;
1796
1797         /*
1798          *  skb_linearize() might change the skb->data and
1799          *  previously cached variables (in this case, hdr) need to
1800          *  be refreshed with the new data.
1801          */
1802         hdr = (struct ieee80211_hdr *)rx->skb->data;
1803         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1804
1805         if (frag == 0) {
1806                 /* This is the first fragment of a new frame. */
1807                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1808                                                  rx->seqno_idx, &(rx->skb));
1809                 if (rx->key &&
1810                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
1811                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256) &&
1812                     ieee80211_has_protected(fc)) {
1813                         int queue = rx->security_idx;
1814                         /* Store CCMP PN so that we can verify that the next
1815                          * fragment has a sequential PN value. */
1816                         entry->ccmp = 1;
1817                         memcpy(entry->last_pn,
1818                                rx->key->u.ccmp.rx_pn[queue],
1819                                IEEE80211_CCMP_PN_LEN);
1820                 }
1821                 return RX_QUEUED;
1822         }
1823
1824         /* This is a fragment for a frame that should already be pending in
1825          * fragment cache. Add this fragment to the end of the pending entry.
1826          */
1827         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1828                                           rx->seqno_idx, hdr);
1829         if (!entry) {
1830                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1831                 return RX_DROP_MONITOR;
1832         }
1833
1834         /* Verify that MPDUs within one MSDU have sequential PN values.
1835          * (IEEE 802.11i, 8.3.3.4.5) */
1836         if (entry->ccmp) {
1837                 int i;
1838                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1839                 int queue;
1840                 if (!rx->key ||
1841                     (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
1842                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256))
1843                         return RX_DROP_UNUSABLE;
1844                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1845                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1846                         pn[i]++;
1847                         if (pn[i])
1848                                 break;
1849                 }
1850                 queue = rx->security_idx;
1851                 rpn = rx->key->u.ccmp.rx_pn[queue];
1852                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1853                         return RX_DROP_UNUSABLE;
1854                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1855         }
1856
1857         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1858         __skb_queue_tail(&entry->skb_list, rx->skb);
1859         entry->last_frag = frag;
1860         entry->extra_len += rx->skb->len;
1861         if (ieee80211_has_morefrags(fc)) {
1862                 rx->skb = NULL;
1863                 return RX_QUEUED;
1864         }
1865
1866         rx->skb = __skb_dequeue(&entry->skb_list);
1867         if (skb_tailroom(rx->skb) < entry->extra_len) {
1868                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1869                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1870                                               GFP_ATOMIC))) {
1871                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1872                         __skb_queue_purge(&entry->skb_list);
1873                         return RX_DROP_UNUSABLE;
1874                 }
1875         }
1876         while ((skb = __skb_dequeue(&entry->skb_list))) {
1877                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1878                 dev_kfree_skb(skb);
1879         }
1880
1881         /* Complete frame has been reassembled - process it now */
1882         status = IEEE80211_SKB_RXCB(rx->skb);
1883         status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1884
1885  out:
1886         ieee80211_led_rx(rx->local);
1887  out_no_led:
1888         if (rx->sta)
1889                 rx->sta->rx_packets++;
1890         return RX_CONTINUE;
1891 }
1892
1893 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1894 {
1895         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1896                 return -EACCES;
1897
1898         return 0;
1899 }
1900
1901 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1902 {
1903         struct sk_buff *skb = rx->skb;
1904         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1905
1906         /*
1907          * Pass through unencrypted frames if the hardware has
1908          * decrypted them already.
1909          */
1910         if (status->flag & RX_FLAG_DECRYPTED)
1911                 return 0;
1912
1913         /* Drop unencrypted frames if key is set. */
1914         if (unlikely(!ieee80211_has_protected(fc) &&
1915                      !ieee80211_is_nullfunc(fc) &&
1916                      ieee80211_is_data(fc) &&
1917                      (rx->key || rx->sdata->drop_unencrypted)))
1918                 return -EACCES;
1919
1920         return 0;
1921 }
1922
1923 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1924 {
1925         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1926         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1927         __le16 fc = hdr->frame_control;
1928
1929         /*
1930          * Pass through unencrypted frames if the hardware has
1931          * decrypted them already.
1932          */
1933         if (status->flag & RX_FLAG_DECRYPTED)
1934                 return 0;
1935
1936         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1937                 if (unlikely(!ieee80211_has_protected(fc) &&
1938                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1939                              rx->key)) {
1940                         if (ieee80211_is_deauth(fc) ||
1941                             ieee80211_is_disassoc(fc))
1942                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1943                                                              rx->skb->data,
1944                                                              rx->skb->len);
1945                         return -EACCES;
1946                 }
1947                 /* BIP does not use Protected field, so need to check MMIE */
1948                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1949                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1950                         if (ieee80211_is_deauth(fc) ||
1951                             ieee80211_is_disassoc(fc))
1952                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1953                                                              rx->skb->data,
1954                                                              rx->skb->len);
1955                         return -EACCES;
1956                 }
1957                 /*
1958                  * When using MFP, Action frames are not allowed prior to
1959                  * having configured keys.
1960                  */
1961                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1962                              ieee80211_is_robust_mgmt_frame(rx->skb)))
1963                         return -EACCES;
1964         }
1965
1966         return 0;
1967 }
1968
1969 static int
1970 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1971 {
1972         struct ieee80211_sub_if_data *sdata = rx->sdata;
1973         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1974         bool check_port_control = false;
1975         struct ethhdr *ehdr;
1976         int ret;
1977
1978         *port_control = false;
1979         if (ieee80211_has_a4(hdr->frame_control) &&
1980             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1981                 return -1;
1982
1983         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1984             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1985
1986                 if (!sdata->u.mgd.use_4addr)
1987                         return -1;
1988                 else
1989                         check_port_control = true;
1990         }
1991
1992         if (is_multicast_ether_addr(hdr->addr1) &&
1993             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1994                 return -1;
1995
1996         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1997         if (ret < 0)
1998                 return ret;
1999
2000         ehdr = (struct ethhdr *) rx->skb->data;
2001         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2002                 *port_control = true;
2003         else if (check_port_control)
2004                 return -1;
2005
2006         return 0;
2007 }
2008
2009 /*
2010  * requires that rx->skb is a frame with ethernet header
2011  */
2012 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2013 {
2014         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2015                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2016         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2017
2018         /*
2019          * Allow EAPOL frames to us/the PAE group address regardless
2020          * of whether the frame was encrypted or not.
2021          */
2022         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2023             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2024              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2025                 return true;
2026
2027         if (ieee80211_802_1x_port_control(rx) ||
2028             ieee80211_drop_unencrypted(rx, fc))
2029                 return false;
2030
2031         return true;
2032 }
2033
2034 /*
2035  * requires that rx->skb is a frame with ethernet header
2036  */
2037 static void
2038 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2039 {
2040         struct ieee80211_sub_if_data *sdata = rx->sdata;
2041         struct net_device *dev = sdata->dev;
2042         struct sk_buff *skb, *xmit_skb;
2043         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2044         struct sta_info *dsta;
2045         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2046
2047         skb = rx->skb;
2048         xmit_skb = NULL;
2049
2050         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2051              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2052             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2053             (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
2054             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2055                 if (is_multicast_ether_addr(ehdr->h_dest)) {
2056                         /*
2057                          * send multicast frames both to higher layers in
2058                          * local net stack and back to the wireless medium
2059                          */
2060                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2061                         if (!xmit_skb)
2062                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2063                                                     dev->name);
2064                 } else {
2065                         dsta = sta_info_get(sdata, skb->data);
2066                         if (dsta) {
2067                                 /*
2068                                  * The destination station is associated to
2069                                  * this AP (in this VLAN), so send the frame
2070                                  * directly to it and do not pass it to local
2071                                  * net stack.
2072                                  */
2073                                 xmit_skb = skb;
2074                                 skb = NULL;
2075                         }
2076                 }
2077         }
2078
2079 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2080         if (skb) {
2081                 /* 'align' will only take the values 0 or 2 here since all
2082                  * frames are required to be aligned to 2-byte boundaries
2083                  * when being passed to mac80211; the code here works just
2084                  * as well if that isn't true, but mac80211 assumes it can
2085                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2086                  */
2087                 int align;
2088
2089                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2090                 if (align) {
2091                         if (WARN_ON(skb_headroom(skb) < 3)) {
2092                                 dev_kfree_skb(skb);
2093                                 skb = NULL;
2094                         } else {
2095                                 u8 *data = skb->data;
2096                                 size_t len = skb_headlen(skb);
2097                                 skb->data -= align;
2098                                 memmove(skb->data, data, len);
2099                                 skb_set_tail_pointer(skb, len);
2100                         }
2101                 }
2102         }
2103 #endif
2104
2105         if (skb) {
2106                 /* deliver to local stack */
2107                 skb->protocol = eth_type_trans(skb, dev);
2108                 memset(skb->cb, 0, sizeof(skb->cb));
2109                 if (rx->local->napi)
2110                         napi_gro_receive(rx->local->napi, skb);
2111                 else
2112                         netif_receive_skb(skb);
2113         }
2114
2115         if (xmit_skb) {
2116                 /*
2117                  * Send to wireless media and increase priority by 256 to
2118                  * keep the received priority instead of reclassifying
2119                  * the frame (see cfg80211_classify8021d).
2120                  */
2121                 xmit_skb->priority += 256;
2122                 xmit_skb->protocol = htons(ETH_P_802_3);
2123                 skb_reset_network_header(xmit_skb);
2124                 skb_reset_mac_header(xmit_skb);
2125                 dev_queue_xmit(xmit_skb);
2126         }
2127 }
2128
2129 static ieee80211_rx_result debug_noinline
2130 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2131 {
2132         struct net_device *dev = rx->sdata->dev;
2133         struct sk_buff *skb = rx->skb;
2134         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2135         __le16 fc = hdr->frame_control;
2136         struct sk_buff_head frame_list;
2137         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2138
2139         if (unlikely(!ieee80211_is_data(fc)))
2140                 return RX_CONTINUE;
2141
2142         if (unlikely(!ieee80211_is_data_present(fc)))
2143                 return RX_DROP_MONITOR;
2144
2145         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2146                 return RX_CONTINUE;
2147
2148         if (ieee80211_has_a4(hdr->frame_control) &&
2149             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2150             !rx->sdata->u.vlan.sta)
2151                 return RX_DROP_UNUSABLE;
2152
2153         if (is_multicast_ether_addr(hdr->addr1) &&
2154             ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2155               rx->sdata->u.vlan.sta) ||
2156              (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2157               rx->sdata->u.mgd.use_4addr)))
2158                 return RX_DROP_UNUSABLE;
2159
2160         skb->dev = dev;
2161         __skb_queue_head_init(&frame_list);
2162
2163         if (skb_linearize(skb))
2164                 return RX_DROP_UNUSABLE;
2165
2166         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2167                                  rx->sdata->vif.type,
2168                                  rx->local->hw.extra_tx_headroom, true);
2169
2170         while (!skb_queue_empty(&frame_list)) {
2171                 rx->skb = __skb_dequeue(&frame_list);
2172
2173                 if (!ieee80211_frame_allowed(rx, fc)) {
2174                         dev_kfree_skb(rx->skb);
2175                         continue;
2176                 }
2177                 dev->stats.rx_packets++;
2178                 dev->stats.rx_bytes += rx->skb->len;
2179
2180                 ieee80211_deliver_skb(rx);
2181         }
2182
2183         return RX_QUEUED;
2184 }
2185
2186 #ifdef CONFIG_MAC80211_MESH
2187 static ieee80211_rx_result
2188 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2189 {
2190         struct ieee80211_hdr *fwd_hdr, *hdr;
2191         struct ieee80211_tx_info *info;
2192         struct ieee80211s_hdr *mesh_hdr;
2193         struct sk_buff *skb = rx->skb, *fwd_skb;
2194         struct ieee80211_local *local = rx->local;
2195         struct ieee80211_sub_if_data *sdata = rx->sdata;
2196         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2197         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2198         u16 q, hdrlen;
2199
2200         hdr = (struct ieee80211_hdr *) skb->data;
2201         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2202
2203         /* make sure fixed part of mesh header is there, also checks skb len */
2204         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2205                 return RX_DROP_MONITOR;
2206
2207         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2208
2209         /* make sure full mesh header is there, also checks skb len */
2210         if (!pskb_may_pull(rx->skb,
2211                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2212                 return RX_DROP_MONITOR;
2213
2214         /* reload pointers */
2215         hdr = (struct ieee80211_hdr *) skb->data;
2216         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2217
2218         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2219                 return RX_DROP_MONITOR;
2220
2221         /* frame is in RMC, don't forward */
2222         if (ieee80211_is_data(hdr->frame_control) &&
2223             is_multicast_ether_addr(hdr->addr1) &&
2224             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2225                 return RX_DROP_MONITOR;
2226
2227         if (!ieee80211_is_data(hdr->frame_control) ||
2228             !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2229                 return RX_CONTINUE;
2230
2231         if (!mesh_hdr->ttl)
2232                 return RX_DROP_MONITOR;
2233
2234         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2235                 struct mesh_path *mppath;
2236                 char *proxied_addr;
2237                 char *mpp_addr;
2238
2239                 if (is_multicast_ether_addr(hdr->addr1)) {
2240                         mpp_addr = hdr->addr3;
2241                         proxied_addr = mesh_hdr->eaddr1;
2242                 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2243                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2244                         mpp_addr = hdr->addr4;
2245                         proxied_addr = mesh_hdr->eaddr2;
2246                 } else {
2247                         return RX_DROP_MONITOR;
2248                 }
2249
2250                 rcu_read_lock();
2251                 mppath = mpp_path_lookup(sdata, proxied_addr);
2252                 if (!mppath) {
2253                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2254                 } else {
2255                         spin_lock_bh(&mppath->state_lock);
2256                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2257                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2258                         spin_unlock_bh(&mppath->state_lock);
2259                 }
2260                 rcu_read_unlock();
2261         }
2262
2263         /* Frame has reached destination.  Don't forward */
2264         if (!is_multicast_ether_addr(hdr->addr1) &&
2265             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2266                 return RX_CONTINUE;
2267
2268         q = ieee80211_select_queue_80211(sdata, skb, hdr);
2269         if (ieee80211_queue_stopped(&local->hw, q)) {
2270                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2271                 return RX_DROP_MONITOR;
2272         }
2273         skb_set_queue_mapping(skb, q);
2274
2275         if (!--mesh_hdr->ttl) {
2276                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2277                 goto out;
2278         }
2279
2280         if (!ifmsh->mshcfg.dot11MeshForwarding)
2281                 goto out;
2282
2283         fwd_skb = skb_copy(skb, GFP_ATOMIC);
2284         if (!fwd_skb) {
2285                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2286                                     sdata->name);
2287                 goto out;
2288         }
2289
2290         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2291         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2292         info = IEEE80211_SKB_CB(fwd_skb);
2293         memset(info, 0, sizeof(*info));
2294         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2295         info->control.vif = &rx->sdata->vif;
2296         info->control.jiffies = jiffies;
2297         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2298                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2299                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2300                 /* update power mode indication when forwarding */
2301                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2302         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2303                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2304                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2305         } else {
2306                 /* unable to resolve next hop */
2307                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2308                                    fwd_hdr->addr3, 0,
2309                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2310                                    fwd_hdr->addr2);
2311                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2312                 kfree_skb(fwd_skb);
2313                 return RX_DROP_MONITOR;
2314         }
2315
2316         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2317         ieee80211_add_pending_skb(local, fwd_skb);
2318  out:
2319         if (is_multicast_ether_addr(hdr->addr1) ||
2320             sdata->dev->flags & IFF_PROMISC)
2321                 return RX_CONTINUE;
2322         else
2323                 return RX_DROP_MONITOR;
2324 }
2325 #endif
2326
2327 static ieee80211_rx_result debug_noinline
2328 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2329 {
2330         struct ieee80211_sub_if_data *sdata = rx->sdata;
2331         struct ieee80211_local *local = rx->local;
2332         struct net_device *dev = sdata->dev;
2333         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2334         __le16 fc = hdr->frame_control;
2335         bool port_control;
2336         int err;
2337
2338         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2339                 return RX_CONTINUE;
2340
2341         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2342                 return RX_DROP_MONITOR;
2343
2344         if (rx->sta) {
2345                 /* The seqno index has the same property as needed
2346                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2347                  * for non-QoS-data frames. Here we know it's a data
2348                  * frame, so count MSDUs.
2349                  */
2350                 rx->sta->rx_msdu[rx->seqno_idx]++;
2351         }
2352
2353         /*
2354          * Send unexpected-4addr-frame event to hostapd. For older versions,
2355          * also drop the frame to cooked monitor interfaces.
2356          */
2357         if (ieee80211_has_a4(hdr->frame_control) &&
2358             sdata->vif.type == NL80211_IFTYPE_AP) {
2359                 if (rx->sta &&
2360                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2361                         cfg80211_rx_unexpected_4addr_frame(
2362                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2363                 return RX_DROP_MONITOR;
2364         }
2365
2366         err = __ieee80211_data_to_8023(rx, &port_control);
2367         if (unlikely(err))
2368                 return RX_DROP_UNUSABLE;
2369
2370         if (!ieee80211_frame_allowed(rx, fc))
2371                 return RX_DROP_MONITOR;
2372
2373         /* directly handle TDLS channel switch requests/responses */
2374         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2375                                                 cpu_to_be16(ETH_P_TDLS))) {
2376                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2377
2378                 if (pskb_may_pull(rx->skb,
2379                                   offsetof(struct ieee80211_tdls_data, u)) &&
2380                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2381                     tf->category == WLAN_CATEGORY_TDLS &&
2382                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2383                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2384                         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TDLS_CHSW;
2385                         skb_queue_tail(&sdata->skb_queue, rx->skb);
2386                         ieee80211_queue_work(&rx->local->hw, &sdata->work);
2387                         if (rx->sta)
2388                                 rx->sta->rx_packets++;
2389
2390                         return RX_QUEUED;
2391                 }
2392         }
2393
2394         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2395             unlikely(port_control) && sdata->bss) {
2396                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2397                                      u.ap);
2398                 dev = sdata->dev;
2399                 rx->sdata = sdata;
2400         }
2401
2402         rx->skb->dev = dev;
2403
2404         dev->stats.rx_packets++;
2405         dev->stats.rx_bytes += rx->skb->len;
2406
2407         if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2408             !is_multicast_ether_addr(
2409                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2410             (!local->scanning &&
2411              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2412                         mod_timer(&local->dynamic_ps_timer, jiffies +
2413                          msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2414         }
2415
2416         ieee80211_deliver_skb(rx);
2417
2418         return RX_QUEUED;
2419 }
2420
2421 static ieee80211_rx_result debug_noinline
2422 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2423 {
2424         struct sk_buff *skb = rx->skb;
2425         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2426         struct tid_ampdu_rx *tid_agg_rx;
2427         u16 start_seq_num;
2428         u16 tid;
2429
2430         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2431                 return RX_CONTINUE;
2432
2433         if (ieee80211_is_back_req(bar->frame_control)) {
2434                 struct {
2435                         __le16 control, start_seq_num;
2436                 } __packed bar_data;
2437
2438                 if (!rx->sta)
2439                         return RX_DROP_MONITOR;
2440
2441                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2442                                   &bar_data, sizeof(bar_data)))
2443                         return RX_DROP_MONITOR;
2444
2445                 tid = le16_to_cpu(bar_data.control) >> 12;
2446
2447                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2448                 if (!tid_agg_rx)
2449                         return RX_DROP_MONITOR;
2450
2451                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2452
2453                 /* reset session timer */
2454                 if (tid_agg_rx->timeout)
2455                         mod_timer(&tid_agg_rx->session_timer,
2456                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2457
2458                 spin_lock(&tid_agg_rx->reorder_lock);
2459                 /* release stored frames up to start of BAR */
2460                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2461                                                  start_seq_num, frames);
2462                 spin_unlock(&tid_agg_rx->reorder_lock);
2463
2464                 kfree_skb(skb);
2465                 return RX_QUEUED;
2466         }
2467
2468         /*
2469          * After this point, we only want management frames,
2470          * so we can drop all remaining control frames to
2471          * cooked monitor interfaces.
2472          */
2473         return RX_DROP_MONITOR;
2474 }
2475
2476 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2477                                            struct ieee80211_mgmt *mgmt,
2478                                            size_t len)
2479 {
2480         struct ieee80211_local *local = sdata->local;
2481         struct sk_buff *skb;
2482         struct ieee80211_mgmt *resp;
2483
2484         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2485                 /* Not to own unicast address */
2486                 return;
2487         }
2488
2489         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2490             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2491                 /* Not from the current AP or not associated yet. */
2492                 return;
2493         }
2494
2495         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2496                 /* Too short SA Query request frame */
2497                 return;
2498         }
2499
2500         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2501         if (skb == NULL)
2502                 return;
2503
2504         skb_reserve(skb, local->hw.extra_tx_headroom);
2505         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2506         memset(resp, 0, 24);
2507         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2508         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2509         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2510         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2511                                           IEEE80211_STYPE_ACTION);
2512         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2513         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2514         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2515         memcpy(resp->u.action.u.sa_query.trans_id,
2516                mgmt->u.action.u.sa_query.trans_id,
2517                WLAN_SA_QUERY_TR_ID_LEN);
2518
2519         ieee80211_tx_skb(sdata, skb);
2520 }
2521
2522 static ieee80211_rx_result debug_noinline
2523 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2524 {
2525         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2526         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2527
2528         /*
2529          * From here on, look only at management frames.
2530          * Data and control frames are already handled,
2531          * and unknown (reserved) frames are useless.
2532          */
2533         if (rx->skb->len < 24)
2534                 return RX_DROP_MONITOR;
2535
2536         if (!ieee80211_is_mgmt(mgmt->frame_control))
2537                 return RX_DROP_MONITOR;
2538
2539         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2540             ieee80211_is_beacon(mgmt->frame_control) &&
2541             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2542                 int sig = 0;
2543
2544                 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2545                         sig = status->signal;
2546
2547                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2548                                             rx->skb->data, rx->skb->len,
2549                                             status->freq, sig);
2550                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2551         }
2552
2553         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2554                 return RX_DROP_MONITOR;
2555
2556         if (ieee80211_drop_unencrypted_mgmt(rx))
2557                 return RX_DROP_UNUSABLE;
2558
2559         return RX_CONTINUE;
2560 }
2561
2562 static ieee80211_rx_result debug_noinline
2563 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2564 {
2565         struct ieee80211_local *local = rx->local;
2566         struct ieee80211_sub_if_data *sdata = rx->sdata;
2567         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2568         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2569         int len = rx->skb->len;
2570
2571         if (!ieee80211_is_action(mgmt->frame_control))
2572                 return RX_CONTINUE;
2573
2574         /* drop too small frames */
2575         if (len < IEEE80211_MIN_ACTION_SIZE)
2576                 return RX_DROP_UNUSABLE;
2577
2578         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2579             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2580             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2581                 return RX_DROP_UNUSABLE;
2582
2583         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2584                 return RX_DROP_UNUSABLE;
2585
2586         switch (mgmt->u.action.category) {
2587         case WLAN_CATEGORY_HT:
2588                 /* reject HT action frames from stations not supporting HT */
2589                 if (!rx->sta->sta.ht_cap.ht_supported)
2590                         goto invalid;
2591
2592                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2593                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2594                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2595                     sdata->vif.type != NL80211_IFTYPE_AP &&
2596                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2597                         break;
2598
2599                 /* verify action & smps_control/chanwidth are present */
2600                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2601                         goto invalid;
2602
2603                 switch (mgmt->u.action.u.ht_smps.action) {
2604                 case WLAN_HT_ACTION_SMPS: {
2605                         struct ieee80211_supported_band *sband;
2606                         enum ieee80211_smps_mode smps_mode;
2607
2608                         /* convert to HT capability */
2609                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2610                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2611                                 smps_mode = IEEE80211_SMPS_OFF;
2612                                 break;
2613                         case WLAN_HT_SMPS_CONTROL_STATIC:
2614                                 smps_mode = IEEE80211_SMPS_STATIC;
2615                                 break;
2616                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2617                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2618                                 break;
2619                         default:
2620                                 goto invalid;
2621                         }
2622
2623                         /* if no change do nothing */
2624                         if (rx->sta->sta.smps_mode == smps_mode)
2625                                 goto handled;
2626                         rx->sta->sta.smps_mode = smps_mode;
2627
2628                         sband = rx->local->hw.wiphy->bands[status->band];
2629
2630                         rate_control_rate_update(local, sband, rx->sta,
2631                                                  IEEE80211_RC_SMPS_CHANGED);
2632                         goto handled;
2633                 }
2634                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2635                         struct ieee80211_supported_band *sband;
2636                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2637                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
2638
2639                         /* If it doesn't support 40 MHz it can't change ... */
2640                         if (!(rx->sta->sta.ht_cap.cap &
2641                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2642                                 goto handled;
2643
2644                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2645                                 max_bw = IEEE80211_STA_RX_BW_20;
2646                         else
2647                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2648
2649                         /* set cur_max_bandwidth and recalc sta bw */
2650                         rx->sta->cur_max_bandwidth = max_bw;
2651                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2652
2653                         if (rx->sta->sta.bandwidth == new_bw)
2654                                 goto handled;
2655
2656                         rx->sta->sta.bandwidth = new_bw;
2657                         sband = rx->local->hw.wiphy->bands[status->band];
2658
2659                         rate_control_rate_update(local, sband, rx->sta,
2660                                                  IEEE80211_RC_BW_CHANGED);
2661                         goto handled;
2662                 }
2663                 default:
2664                         goto invalid;
2665                 }
2666
2667                 break;
2668         case WLAN_CATEGORY_PUBLIC:
2669                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2670                         goto invalid;
2671                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2672                         break;
2673                 if (!rx->sta)
2674                         break;
2675                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2676                         break;
2677                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2678                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2679                         break;
2680                 if (len < offsetof(struct ieee80211_mgmt,
2681                                    u.action.u.ext_chan_switch.variable))
2682                         goto invalid;
2683                 goto queue;
2684         case WLAN_CATEGORY_VHT:
2685                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2686                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2687                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2688                     sdata->vif.type != NL80211_IFTYPE_AP &&
2689                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2690                         break;
2691
2692                 /* verify action code is present */
2693                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2694                         goto invalid;
2695
2696                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2697                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2698                         u8 opmode;
2699
2700                         /* verify opmode is present */
2701                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2702                                 goto invalid;
2703
2704                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2705
2706                         ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2707                                                     opmode, status->band,
2708                                                     false);
2709                         goto handled;
2710                 }
2711                 default:
2712                         break;
2713                 }
2714                 break;
2715         case WLAN_CATEGORY_BACK:
2716                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2717                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2718                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2719                     sdata->vif.type != NL80211_IFTYPE_AP &&
2720                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2721                         break;
2722
2723                 /* verify action_code is present */
2724                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2725                         break;
2726
2727                 switch (mgmt->u.action.u.addba_req.action_code) {
2728                 case WLAN_ACTION_ADDBA_REQ:
2729                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2730                                    sizeof(mgmt->u.action.u.addba_req)))
2731                                 goto invalid;
2732                         break;
2733                 case WLAN_ACTION_ADDBA_RESP:
2734                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2735                                    sizeof(mgmt->u.action.u.addba_resp)))
2736                                 goto invalid;
2737                         break;
2738                 case WLAN_ACTION_DELBA:
2739                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2740                                    sizeof(mgmt->u.action.u.delba)))
2741                                 goto invalid;
2742                         break;
2743                 default:
2744                         goto invalid;
2745                 }
2746
2747                 goto queue;
2748         case WLAN_CATEGORY_SPECTRUM_MGMT:
2749                 /* verify action_code is present */
2750                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2751                         break;
2752
2753                 switch (mgmt->u.action.u.measurement.action_code) {
2754                 case WLAN_ACTION_SPCT_MSR_REQ:
2755                         if (status->band != IEEE80211_BAND_5GHZ)
2756                                 break;
2757
2758                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2759                                    sizeof(mgmt->u.action.u.measurement)))
2760                                 break;
2761
2762                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2763                                 break;
2764
2765                         ieee80211_process_measurement_req(sdata, mgmt, len);
2766                         goto handled;
2767                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2768                         u8 *bssid;
2769                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2770                                    sizeof(mgmt->u.action.u.chan_switch)))
2771                                 break;
2772
2773                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2774                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2775                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2776                                 break;
2777
2778                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2779                                 bssid = sdata->u.mgd.bssid;
2780                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2781                                 bssid = sdata->u.ibss.bssid;
2782                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2783                                 bssid = mgmt->sa;
2784                         else
2785                                 break;
2786
2787                         if (!ether_addr_equal(mgmt->bssid, bssid))
2788                                 break;
2789
2790                         goto queue;
2791                         }
2792                 }
2793                 break;
2794         case WLAN_CATEGORY_SA_QUERY:
2795                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2796                            sizeof(mgmt->u.action.u.sa_query)))
2797                         break;
2798
2799                 switch (mgmt->u.action.u.sa_query.action) {
2800                 case WLAN_ACTION_SA_QUERY_REQUEST:
2801                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2802                                 break;
2803                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2804                         goto handled;
2805                 }
2806                 break;
2807         case WLAN_CATEGORY_SELF_PROTECTED:
2808                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2809                            sizeof(mgmt->u.action.u.self_prot.action_code)))
2810                         break;
2811
2812                 switch (mgmt->u.action.u.self_prot.action_code) {
2813                 case WLAN_SP_MESH_PEERING_OPEN:
2814                 case WLAN_SP_MESH_PEERING_CLOSE:
2815                 case WLAN_SP_MESH_PEERING_CONFIRM:
2816                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2817                                 goto invalid;
2818                         if (sdata->u.mesh.user_mpm)
2819                                 /* userspace handles this frame */
2820                                 break;
2821                         goto queue;
2822                 case WLAN_SP_MGK_INFORM:
2823                 case WLAN_SP_MGK_ACK:
2824                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2825                                 goto invalid;
2826                         break;
2827                 }
2828                 break;
2829         case WLAN_CATEGORY_MESH_ACTION:
2830                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2831                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
2832                         break;
2833
2834                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2835                         break;
2836                 if (mesh_action_is_path_sel(mgmt) &&
2837                     !mesh_path_sel_is_hwmp(sdata))
2838                         break;
2839                 goto queue;
2840         }
2841
2842         return RX_CONTINUE;
2843
2844  invalid:
2845         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2846         /* will return in the next handlers */
2847         return RX_CONTINUE;
2848
2849  handled:
2850         if (rx->sta)
2851                 rx->sta->rx_packets++;
2852         dev_kfree_skb(rx->skb);
2853         return RX_QUEUED;
2854
2855  queue:
2856         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2857         skb_queue_tail(&sdata->skb_queue, rx->skb);
2858         ieee80211_queue_work(&local->hw, &sdata->work);
2859         if (rx->sta)
2860                 rx->sta->rx_packets++;
2861         return RX_QUEUED;
2862 }
2863
2864 static ieee80211_rx_result debug_noinline
2865 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2866 {
2867         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2868         int sig = 0;
2869
2870         /* skip known-bad action frames and return them in the next handler */
2871         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2872                 return RX_CONTINUE;
2873
2874         /*
2875          * Getting here means the kernel doesn't know how to handle
2876          * it, but maybe userspace does ... include returned frames
2877          * so userspace can register for those to know whether ones
2878          * it transmitted were processed or returned.
2879          */
2880
2881         if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2882                 sig = status->signal;
2883
2884         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2885                              rx->skb->data, rx->skb->len, 0)) {
2886                 if (rx->sta)
2887                         rx->sta->rx_packets++;
2888                 dev_kfree_skb(rx->skb);
2889                 return RX_QUEUED;
2890         }
2891
2892         return RX_CONTINUE;
2893 }
2894
2895 static ieee80211_rx_result debug_noinline
2896 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2897 {
2898         struct ieee80211_local *local = rx->local;
2899         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2900         struct sk_buff *nskb;
2901         struct ieee80211_sub_if_data *sdata = rx->sdata;
2902         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2903
2904         if (!ieee80211_is_action(mgmt->frame_control))
2905                 return RX_CONTINUE;
2906
2907         /*
2908          * For AP mode, hostapd is responsible for handling any action
2909          * frames that we didn't handle, including returning unknown
2910          * ones. For all other modes we will return them to the sender,
2911          * setting the 0x80 bit in the action category, as required by
2912          * 802.11-2012 9.24.4.
2913          * Newer versions of hostapd shall also use the management frame
2914          * registration mechanisms, but older ones still use cooked
2915          * monitor interfaces so push all frames there.
2916          */
2917         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2918             (sdata->vif.type == NL80211_IFTYPE_AP ||
2919              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2920                 return RX_DROP_MONITOR;
2921
2922         if (is_multicast_ether_addr(mgmt->da))
2923                 return RX_DROP_MONITOR;
2924
2925         /* do not return rejected action frames */
2926         if (mgmt->u.action.category & 0x80)
2927                 return RX_DROP_UNUSABLE;
2928
2929         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2930                                GFP_ATOMIC);
2931         if (nskb) {
2932                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2933
2934                 nmgmt->u.action.category |= 0x80;
2935                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2936                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2937
2938                 memset(nskb->cb, 0, sizeof(nskb->cb));
2939
2940                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2941                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2942
2943                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2944                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2945                                       IEEE80211_TX_CTL_NO_CCK_RATE;
2946                         if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2947                                 info->hw_queue =
2948                                         local->hw.offchannel_tx_hw_queue;
2949                 }
2950
2951                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2952                                             status->band);
2953         }
2954         dev_kfree_skb(rx->skb);
2955         return RX_QUEUED;
2956 }
2957
2958 static ieee80211_rx_result debug_noinline
2959 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2960 {
2961         struct ieee80211_sub_if_data *sdata = rx->sdata;
2962         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2963         __le16 stype;
2964
2965         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2966
2967         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2968             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2969             sdata->vif.type != NL80211_IFTYPE_OCB &&
2970             sdata->vif.type != NL80211_IFTYPE_STATION)
2971                 return RX_DROP_MONITOR;
2972
2973         switch (stype) {
2974         case cpu_to_le16(IEEE80211_STYPE_AUTH):
2975         case cpu_to_le16(IEEE80211_STYPE_BEACON):
2976         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2977                 /* process for all: mesh, mlme, ibss */
2978                 break;
2979         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2980         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2981         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2982         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2983                 if (is_multicast_ether_addr(mgmt->da) &&
2984                     !is_broadcast_ether_addr(mgmt->da))
2985                         return RX_DROP_MONITOR;
2986
2987                 /* process only for station */
2988                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2989                         return RX_DROP_MONITOR;
2990                 break;
2991         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2992                 /* process only for ibss and mesh */
2993                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2994                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2995                         return RX_DROP_MONITOR;
2996                 break;
2997         default:
2998                 return RX_DROP_MONITOR;
2999         }
3000
3001         /* queue up frame and kick off work to process it */
3002         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3003         skb_queue_tail(&sdata->skb_queue, rx->skb);
3004         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3005         if (rx->sta)
3006                 rx->sta->rx_packets++;
3007
3008         return RX_QUEUED;
3009 }
3010
3011 /* TODO: use IEEE80211_RX_FRAGMENTED */
3012 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3013                                         struct ieee80211_rate *rate)
3014 {
3015         struct ieee80211_sub_if_data *sdata;
3016         struct ieee80211_local *local = rx->local;
3017         struct sk_buff *skb = rx->skb, *skb2;
3018         struct net_device *prev_dev = NULL;
3019         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3020         int needed_headroom;
3021
3022         /*
3023          * If cooked monitor has been processed already, then
3024          * don't do it again. If not, set the flag.
3025          */
3026         if (rx->flags & IEEE80211_RX_CMNTR)
3027                 goto out_free_skb;
3028         rx->flags |= IEEE80211_RX_CMNTR;
3029
3030         /* If there are no cooked monitor interfaces, just free the SKB */
3031         if (!local->cooked_mntrs)
3032                 goto out_free_skb;
3033
3034         /* vendor data is long removed here */
3035         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3036         /* room for the radiotap header based on driver features */
3037         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3038
3039         if (skb_headroom(skb) < needed_headroom &&
3040             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3041                 goto out_free_skb;
3042
3043         /* prepend radiotap information */
3044         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3045                                          false);
3046
3047         skb_set_mac_header(skb, 0);
3048         skb->ip_summed = CHECKSUM_UNNECESSARY;
3049         skb->pkt_type = PACKET_OTHERHOST;
3050         skb->protocol = htons(ETH_P_802_2);
3051
3052         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3053                 if (!ieee80211_sdata_running(sdata))
3054                         continue;
3055
3056                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3057                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
3058                         continue;
3059
3060                 if (prev_dev) {
3061                         skb2 = skb_clone(skb, GFP_ATOMIC);
3062                         if (skb2) {
3063                                 skb2->dev = prev_dev;
3064                                 netif_receive_skb(skb2);
3065                         }
3066                 }
3067
3068                 prev_dev = sdata->dev;
3069                 sdata->dev->stats.rx_packets++;
3070                 sdata->dev->stats.rx_bytes += skb->len;
3071         }
3072
3073         if (prev_dev) {
3074                 skb->dev = prev_dev;
3075                 netif_receive_skb(skb);
3076                 return;
3077         }
3078
3079  out_free_skb:
3080         dev_kfree_skb(skb);
3081 }
3082
3083 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3084                                          ieee80211_rx_result res)
3085 {
3086         switch (res) {
3087         case RX_DROP_MONITOR:
3088                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3089                 if (rx->sta)
3090                         rx->sta->rx_dropped++;
3091                 /* fall through */
3092         case RX_CONTINUE: {
3093                 struct ieee80211_rate *rate = NULL;
3094                 struct ieee80211_supported_band *sband;
3095                 struct ieee80211_rx_status *status;
3096
3097                 status = IEEE80211_SKB_RXCB((rx->skb));
3098
3099                 sband = rx->local->hw.wiphy->bands[status->band];
3100                 if (!(status->flag & RX_FLAG_HT) &&
3101                     !(status->flag & RX_FLAG_VHT))
3102                         rate = &sband->bitrates[status->rate_idx];
3103
3104                 ieee80211_rx_cooked_monitor(rx, rate);
3105                 break;
3106                 }
3107         case RX_DROP_UNUSABLE:
3108                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3109                 if (rx->sta)
3110                         rx->sta->rx_dropped++;
3111                 dev_kfree_skb(rx->skb);
3112                 break;
3113         case RX_QUEUED:
3114                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3115                 break;
3116         }
3117 }
3118
3119 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3120                                   struct sk_buff_head *frames)
3121 {
3122         ieee80211_rx_result res = RX_DROP_MONITOR;
3123         struct sk_buff *skb;
3124
3125 #define CALL_RXH(rxh)                   \
3126         do {                            \
3127                 res = rxh(rx);          \
3128                 if (res != RX_CONTINUE) \
3129                         goto rxh_next;  \
3130         } while (0);
3131
3132         spin_lock_bh(&rx->local->rx_path_lock);
3133
3134         while ((skb = __skb_dequeue(frames))) {
3135                 /*
3136                  * all the other fields are valid across frames
3137                  * that belong to an aMPDU since they are on the
3138                  * same TID from the same station
3139                  */
3140                 rx->skb = skb;
3141
3142                 CALL_RXH(ieee80211_rx_h_check_more_data)
3143                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
3144                 CALL_RXH(ieee80211_rx_h_sta_process)
3145                 CALL_RXH(ieee80211_rx_h_decrypt)
3146                 CALL_RXH(ieee80211_rx_h_defragment)
3147                 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
3148                 /* must be after MMIC verify so header is counted in MPDU mic */
3149 #ifdef CONFIG_MAC80211_MESH
3150                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3151                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3152 #endif
3153                 CALL_RXH(ieee80211_rx_h_amsdu)
3154                 CALL_RXH(ieee80211_rx_h_data)
3155
3156                 /* special treatment -- needs the queue */
3157                 res = ieee80211_rx_h_ctrl(rx, frames);
3158                 if (res != RX_CONTINUE)
3159                         goto rxh_next;
3160
3161                 CALL_RXH(ieee80211_rx_h_mgmt_check)
3162                 CALL_RXH(ieee80211_rx_h_action)
3163                 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
3164                 CALL_RXH(ieee80211_rx_h_action_return)
3165                 CALL_RXH(ieee80211_rx_h_mgmt)
3166
3167  rxh_next:
3168                 ieee80211_rx_handlers_result(rx, res);
3169
3170 #undef CALL_RXH
3171         }
3172
3173         spin_unlock_bh(&rx->local->rx_path_lock);
3174 }
3175
3176 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3177 {
3178         struct sk_buff_head reorder_release;
3179         ieee80211_rx_result res = RX_DROP_MONITOR;
3180
3181         __skb_queue_head_init(&reorder_release);
3182
3183 #define CALL_RXH(rxh)                   \
3184         do {                            \
3185                 res = rxh(rx);          \
3186                 if (res != RX_CONTINUE) \
3187                         goto rxh_next;  \
3188         } while (0);
3189
3190         CALL_RXH(ieee80211_rx_h_check_dup)
3191         CALL_RXH(ieee80211_rx_h_check)
3192
3193         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3194
3195         ieee80211_rx_handlers(rx, &reorder_release);
3196         return;
3197
3198  rxh_next:
3199         ieee80211_rx_handlers_result(rx, res);
3200
3201 #undef CALL_RXH
3202 }
3203
3204 /*
3205  * This function makes calls into the RX path, therefore
3206  * it has to be invoked under RCU read lock.
3207  */
3208 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3209 {
3210         struct sk_buff_head frames;
3211         struct ieee80211_rx_data rx = {
3212                 .sta = sta,
3213                 .sdata = sta->sdata,
3214                 .local = sta->local,
3215                 /* This is OK -- must be QoS data frame */
3216                 .security_idx = tid,
3217                 .seqno_idx = tid,
3218                 .flags = 0,
3219         };
3220         struct tid_ampdu_rx *tid_agg_rx;
3221
3222         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3223         if (!tid_agg_rx)
3224                 return;
3225
3226         __skb_queue_head_init(&frames);
3227
3228         spin_lock(&tid_agg_rx->reorder_lock);
3229         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3230         spin_unlock(&tid_agg_rx->reorder_lock);
3231
3232         ieee80211_rx_handlers(&rx, &frames);
3233 }
3234
3235 /* main receive path */
3236
3237 static bool prepare_for_handlers(struct ieee80211_rx_data *rx,
3238                                  struct ieee80211_hdr *hdr)
3239 {
3240         struct ieee80211_sub_if_data *sdata = rx->sdata;
3241         struct sk_buff *skb = rx->skb;
3242         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3243         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3244         int multicast = is_multicast_ether_addr(hdr->addr1);
3245
3246         switch (sdata->vif.type) {
3247         case NL80211_IFTYPE_STATION:
3248                 if (!bssid && !sdata->u.mgd.use_4addr)
3249                         return false;
3250                 if (!multicast &&
3251                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3252                         if (!(sdata->dev->flags & IFF_PROMISC) ||
3253                             sdata->u.mgd.use_4addr)
3254                                 return false;
3255                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3256                 }
3257                 break;
3258         case NL80211_IFTYPE_ADHOC:
3259                 if (!bssid)
3260                         return false;
3261                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3262                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3263                         return false;
3264                 if (ieee80211_is_beacon(hdr->frame_control)) {
3265                         return true;
3266                 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3267                         return false;
3268                 } else if (!multicast &&
3269                            !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3270                         if (!(sdata->dev->flags & IFF_PROMISC))
3271                                 return false;
3272                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3273                 } else if (!rx->sta) {
3274                         int rate_idx;
3275                         if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3276                                 rate_idx = 0; /* TODO: HT/VHT rates */
3277                         else
3278                                 rate_idx = status->rate_idx;
3279                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3280                                                  BIT(rate_idx));
3281                 }
3282                 break;
3283         case NL80211_IFTYPE_OCB:
3284                 if (!bssid)
3285                         return false;
3286                 if (ieee80211_is_beacon(hdr->frame_control)) {
3287                         return false;
3288                 } else if (!is_broadcast_ether_addr(bssid)) {
3289                         ocb_dbg(sdata, "BSSID mismatch in OCB mode!\n");
3290                         return false;
3291                 } else if (!multicast &&
3292                            !ether_addr_equal(sdata->dev->dev_addr,
3293                                              hdr->addr1)) {
3294                         /* if we are in promisc mode we also accept
3295                          * packets not destined for us
3296                          */
3297                         if (!(sdata->dev->flags & IFF_PROMISC))
3298                                 return false;
3299                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
3300                 } else if (!rx->sta) {
3301                         int rate_idx;
3302                         if (status->flag & RX_FLAG_HT)
3303                                 rate_idx = 0; /* TODO: HT rates */
3304                         else
3305                                 rate_idx = status->rate_idx;
3306                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3307                                                 BIT(rate_idx));
3308                 }
3309                 break;
3310         case NL80211_IFTYPE_MESH_POINT:
3311                 if (!multicast &&
3312                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3313                         if (!(sdata->dev->flags & IFF_PROMISC))
3314                                 return false;
3315
3316                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3317                 }
3318                 break;
3319         case NL80211_IFTYPE_AP_VLAN:
3320         case NL80211_IFTYPE_AP:
3321                 if (!bssid) {
3322                         if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3323                                 return false;
3324                 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3325                         /*
3326                          * Accept public action frames even when the
3327                          * BSSID doesn't match, this is used for P2P
3328                          * and location updates. Note that mac80211
3329                          * itself never looks at these frames.
3330                          */
3331                         if (!multicast &&
3332                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3333                                 return false;
3334                         if (ieee80211_is_public_action(hdr, skb->len))
3335                                 return true;
3336                         if (!ieee80211_is_beacon(hdr->frame_control))
3337                                 return false;
3338                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3339                 } else if (!ieee80211_has_tods(hdr->frame_control)) {
3340                         /* ignore data frames to TDLS-peers */
3341                         if (ieee80211_is_data(hdr->frame_control))
3342                                 return false;
3343                         /* ignore action frames to TDLS-peers */
3344                         if (ieee80211_is_action(hdr->frame_control) &&
3345                             !ether_addr_equal(bssid, hdr->addr1))
3346                                 return false;
3347                 }
3348                 break;
3349         case NL80211_IFTYPE_WDS:
3350                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3351                         return false;
3352                 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3353                         return false;
3354                 break;
3355         case NL80211_IFTYPE_P2P_DEVICE:
3356                 if (!ieee80211_is_public_action(hdr, skb->len) &&
3357                     !ieee80211_is_probe_req(hdr->frame_control) &&
3358                     !ieee80211_is_probe_resp(hdr->frame_control) &&
3359                     !ieee80211_is_beacon(hdr->frame_control))
3360                         return false;
3361                 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3362                     !multicast)
3363                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3364                 break;
3365         default:
3366                 /* should never get here */
3367                 WARN_ON_ONCE(1);
3368                 break;
3369         }
3370
3371         return true;
3372 }
3373
3374 /*
3375  * This function returns whether or not the SKB
3376  * was destined for RX processing or not, which,
3377  * if consume is true, is equivalent to whether
3378  * or not the skb was consumed.
3379  */
3380 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3381                                             struct sk_buff *skb, bool consume)
3382 {
3383         struct ieee80211_local *local = rx->local;
3384         struct ieee80211_sub_if_data *sdata = rx->sdata;
3385         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3386         struct ieee80211_hdr *hdr = (void *)skb->data;
3387
3388         rx->skb = skb;
3389         status->rx_flags |= IEEE80211_RX_RA_MATCH;
3390
3391         if (!prepare_for_handlers(rx, hdr))
3392                 return false;
3393
3394         if (!consume) {
3395                 skb = skb_copy(skb, GFP_ATOMIC);
3396                 if (!skb) {
3397                         if (net_ratelimit())
3398                                 wiphy_debug(local->hw.wiphy,
3399                                         "failed to copy skb for %s\n",
3400                                         sdata->name);
3401                         return true;
3402                 }
3403
3404                 rx->skb = skb;
3405         }
3406
3407         ieee80211_invoke_rx_handlers(rx);
3408         return true;
3409 }
3410
3411 /*
3412  * This is the actual Rx frames handler. as it belongs to Rx path it must
3413  * be called with rcu_read_lock protection.
3414  */
3415 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3416                                          struct sk_buff *skb)
3417 {
3418         struct ieee80211_local *local = hw_to_local(hw);
3419         struct ieee80211_sub_if_data *sdata;
3420         struct ieee80211_hdr *hdr;
3421         __le16 fc;
3422         struct ieee80211_rx_data rx;
3423         struct ieee80211_sub_if_data *prev;
3424         struct sta_info *sta, *tmp, *prev_sta;
3425         int err = 0;
3426
3427         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3428         memset(&rx, 0, sizeof(rx));
3429         rx.skb = skb;
3430         rx.local = local;
3431
3432         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3433                 local->dot11ReceivedFragmentCount++;
3434
3435         if (ieee80211_is_mgmt(fc)) {
3436                 /* drop frame if too short for header */
3437                 if (skb->len < ieee80211_hdrlen(fc))
3438                         err = -ENOBUFS;
3439                 else
3440                         err = skb_linearize(skb);
3441         } else {
3442                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3443         }
3444
3445         if (err) {
3446                 dev_kfree_skb(skb);
3447                 return;
3448         }
3449
3450         hdr = (struct ieee80211_hdr *)skb->data;
3451         ieee80211_parse_qos(&rx);
3452         ieee80211_verify_alignment(&rx);
3453
3454         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3455                      ieee80211_is_beacon(hdr->frame_control)))
3456                 ieee80211_scan_rx(local, skb);
3457
3458         if (ieee80211_is_data(fc)) {
3459                 prev_sta = NULL;
3460
3461                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
3462                         if (!prev_sta) {
3463                                 prev_sta = sta;
3464                                 continue;
3465                         }
3466
3467                         rx.sta = prev_sta;
3468                         rx.sdata = prev_sta->sdata;
3469                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
3470
3471                         prev_sta = sta;
3472                 }
3473
3474                 if (prev_sta) {
3475                         rx.sta = prev_sta;
3476                         rx.sdata = prev_sta->sdata;
3477
3478                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3479                                 return;
3480                         goto out;
3481                 }
3482         }
3483
3484         prev = NULL;
3485
3486         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3487                 if (!ieee80211_sdata_running(sdata))
3488                         continue;
3489
3490                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3491                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3492                         continue;
3493
3494                 /*
3495                  * frame is destined for this interface, but if it's
3496                  * not also for the previous one we handle that after
3497                  * the loop to avoid copying the SKB once too much
3498                  */
3499
3500                 if (!prev) {
3501                         prev = sdata;
3502                         continue;
3503                 }
3504
3505                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3506                 rx.sdata = prev;
3507                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3508
3509                 prev = sdata;
3510         }
3511
3512         if (prev) {
3513                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3514                 rx.sdata = prev;
3515
3516                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3517                         return;
3518         }
3519
3520  out:
3521         dev_kfree_skb(skb);
3522 }
3523
3524 /*
3525  * This is the receive path handler. It is called by a low level driver when an
3526  * 802.11 MPDU is received from the hardware.
3527  */
3528 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3529 {
3530         struct ieee80211_local *local = hw_to_local(hw);
3531         struct ieee80211_rate *rate = NULL;
3532         struct ieee80211_supported_band *sband;
3533         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3534
3535         WARN_ON_ONCE(softirq_count() == 0);
3536
3537         if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3538                 goto drop;
3539
3540         sband = local->hw.wiphy->bands[status->band];
3541         if (WARN_ON(!sband))
3542                 goto drop;
3543
3544         /*
3545          * If we're suspending, it is possible although not too likely
3546          * that we'd be receiving frames after having already partially
3547          * quiesced the stack. We can't process such frames then since
3548          * that might, for example, cause stations to be added or other
3549          * driver callbacks be invoked.
3550          */
3551         if (unlikely(local->quiescing || local->suspended))
3552                 goto drop;
3553
3554         /* We might be during a HW reconfig, prevent Rx for the same reason */
3555         if (unlikely(local->in_reconfig))
3556                 goto drop;
3557
3558         /*
3559          * The same happens when we're not even started,
3560          * but that's worth a warning.
3561          */
3562         if (WARN_ON(!local->started))
3563                 goto drop;
3564
3565         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3566                 /*
3567                  * Validate the rate, unless a PLCP error means that
3568                  * we probably can't have a valid rate here anyway.
3569                  */
3570
3571                 if (status->flag & RX_FLAG_HT) {
3572                         /*
3573                          * rate_idx is MCS index, which can be [0-76]
3574                          * as documented on:
3575                          *
3576                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3577                          *
3578                          * Anything else would be some sort of driver or
3579                          * hardware error. The driver should catch hardware
3580                          * errors.
3581                          */
3582                         if (WARN(status->rate_idx > 76,
3583                                  "Rate marked as an HT rate but passed "
3584                                  "status->rate_idx is not "
3585                                  "an MCS index [0-76]: %d (0x%02x)\n",
3586                                  status->rate_idx,
3587                                  status->rate_idx))
3588                                 goto drop;
3589                 } else if (status->flag & RX_FLAG_VHT) {
3590                         if (WARN_ONCE(status->rate_idx > 9 ||
3591                                       !status->vht_nss ||
3592                                       status->vht_nss > 8,
3593                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3594                                       status->rate_idx, status->vht_nss))
3595                                 goto drop;
3596                 } else {
3597                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3598                                 goto drop;
3599                         rate = &sband->bitrates[status->rate_idx];
3600                 }
3601         }
3602
3603         status->rx_flags = 0;
3604
3605         /*
3606          * key references and virtual interfaces are protected using RCU
3607          * and this requires that we are in a read-side RCU section during
3608          * receive processing
3609          */
3610         rcu_read_lock();
3611
3612         /*
3613          * Frames with failed FCS/PLCP checksum are not returned,
3614          * all other frames are returned without radiotap header
3615          * if it was previously present.
3616          * Also, frames with less than 16 bytes are dropped.
3617          */
3618         skb = ieee80211_rx_monitor(local, skb, rate);
3619         if (!skb) {
3620                 rcu_read_unlock();
3621                 return;
3622         }
3623
3624         ieee80211_tpt_led_trig_rx(local,
3625                         ((struct ieee80211_hdr *)skb->data)->frame_control,
3626                         skb->len);
3627         __ieee80211_rx_handle_packet(hw, skb);
3628
3629         rcu_read_unlock();
3630
3631         return;
3632  drop:
3633         kfree_skb(skb);
3634 }
3635 EXPORT_SYMBOL(ieee80211_rx);
3636
3637 /* This is a version of the rx handler that can be called from hard irq
3638  * context. Post the skb on the queue and schedule the tasklet */
3639 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3640 {
3641         struct ieee80211_local *local = hw_to_local(hw);
3642
3643         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3644
3645         skb->pkt_type = IEEE80211_RX_MSG;
3646         skb_queue_tail(&local->skb_queue, skb);
3647         tasklet_schedule(&local->tasklet);
3648 }
3649 EXPORT_SYMBOL(ieee80211_rx_irqsafe);