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 static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
  36 {
  37         struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
  38
  39         u64_stats_update_begin(&tstats->syncp);
  40         tstats->rx_packets++;
  41         tstats->rx_bytes += len;
  42         u64_stats_update_end(&tstats->syncp);
  43 }
  44
  45 /*
  46  * monitor mode reception
  47  *
  48  * This function cleans up the SKB, i.e. it removes all the stuff
  49  * only useful for monitoring.
  50  */
  51 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
  52                                            struct sk_buff *skb,
  53                                            unsigned int rtap_vendor_space)
  54 {
  55         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
  56                 if (likely(skb->len > FCS_LEN))
  57                         __pskb_trim(skb, skb->len - FCS_LEN);
  58                 else {
  59                         /* driver bug */
  60                         WARN_ON(1);
  61                         dev_kfree_skb(skb);
  62                         return NULL;
  63                 }
  64         }
  65
  66         __pskb_pull(skb, rtap_vendor_space);
  67
  68         return skb;
  69 }
  70
  71 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
  72                                      unsigned int rtap_vendor_space)
  73 {
  74         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
  75         struct ieee80211_hdr *hdr;
  76
  77         hdr = (void *)(skb->data + rtap_vendor_space);
  78
  79         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
  80                             RX_FLAG_FAILED_PLCP_CRC |
  81                             RX_FLAG_AMPDU_IS_ZEROLEN))
  82                 return true;
  83
  84         if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
  85                 return true;
  86
  87         if (ieee80211_is_ctl(hdr->frame_control) &&
  88             !ieee80211_is_pspoll(hdr->frame_control) &&
  89             !ieee80211_is_back_req(hdr->frame_control))
  90                 return true;
  91
  92         return false;
  93 }
  94
  95 static int
  96 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
  97                              struct ieee80211_rx_status *status,
  98                              struct sk_buff *skb)
  99 {
 100         int len;
 101
 102         /* always present fields */
 103         len = sizeof(struct ieee80211_radiotap_header) + 8;
 104
 105         /* allocate extra bitmaps */
 106         if (status->chains)
 107                 len += 4 * hweight8(status->chains);
 108
 109         if (ieee80211_have_rx_timestamp(status)) {
 110                 len = ALIGN(len, 8);
 111                 len += 8;
 112         }
 113         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 114                 len += 1;
 115
 116         /* antenna field, if we don't have per-chain info */
 117         if (!status->chains)
 118                 len += 1;
 119
 120         /* padding for RX_FLAGS if necessary */
 121         len = ALIGN(len, 2);
 122
 123         if (status->flag & RX_FLAG_HT) /* HT info */
 124                 len += 3;
 125
 126         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 127                 len = ALIGN(len, 4);
 128                 len += 8;
 129         }
 130
 131         if (status->flag & RX_FLAG_VHT) {
 132                 len = ALIGN(len, 2);
 133                 len += 12;
 134         }
 135
 136         if (status->chains) {
 137                 /* antenna and antenna signal fields */
 138                 len += 2 * hweight8(status->chains);
 139         }
 140
 141         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 142                 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
 143
 144                 /* vendor presence bitmap */
 145                 len += 4;
 146                 /* alignment for fixed 6-byte vendor data header */
 147                 len = ALIGN(len, 2);
 148                 /* vendor data header */
 149                 len += 6;
 150                 if (WARN_ON(rtap->align == 0))
 151                         rtap->align = 1;
 152                 len = ALIGN(len, rtap->align);
 153                 len += rtap->len + rtap->pad;
 154         }
 155
 156         return len;
 157 }
 158
 159 /*
 160  * ieee80211_add_rx_radiotap_header - add radiotap header
 161  *
 162  * add a radiotap header containing all the fields which the hardware provided.
 163  */
 164 static void
 165 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 166                                  struct sk_buff *skb,
 167                                  struct ieee80211_rate *rate,
 168                                  int rtap_len, bool has_fcs)
 169 {
 170         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 171         struct ieee80211_radiotap_header *rthdr;
 172         unsigned char *pos;
 173         __le32 *it_present;
 174         u32 it_present_val;
 175         u16 rx_flags = 0;
 176         u16 channel_flags = 0;
 177         int mpdulen, chain;
 178         unsigned long chains = status->chains;
 179         struct ieee80211_vendor_radiotap rtap = {};
 180
 181         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 182                 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
 183                 /* rtap.len and rtap.pad are undone immediately */
 184                 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
 185         }
 186
 187         mpdulen = skb->len;
 188         if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
 189                 mpdulen += FCS_LEN;
 190
 191         rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
 192         memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
 193         it_present = &rthdr->it_present;
 194
 195         /* radiotap header, set always present flags */
 196         rthdr->it_len = cpu_to_le16(rtap_len);
 197         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
 198                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
 199                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
 200
 201         if (!status->chains)
 202                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
 203
 204         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 205                 it_present_val |=
 206                         BIT(IEEE80211_RADIOTAP_EXT) |
 207                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
 208                 put_unaligned_le32(it_present_val, it_present);
 209                 it_present++;
 210                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
 211                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 212         }
 213
 214         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 215                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
 216                                   BIT(IEEE80211_RADIOTAP_EXT);
 217                 put_unaligned_le32(it_present_val, it_present);
 218                 it_present++;
 219                 it_present_val = rtap.present;
 220         }
 221
 222         put_unaligned_le32(it_present_val, it_present);
 223
 224         pos = (void *)(it_present + 1);
 225
 226         /* the order of the following fields is important */
 227
 228         /* IEEE80211_RADIOTAP_TSFT */
 229         if (ieee80211_have_rx_timestamp(status)) {
 230                 /* padding */
 231                 while ((pos - (u8 *)rthdr) & 7)
 232                         *pos++ = 0;
 233                 put_unaligned_le64(
 234                         ieee80211_calculate_rx_timestamp(local, status,
 235                                                          mpdulen, 0),
 236                         pos);
 237                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 238                 pos += 8;
 239         }
 240
 241         /* IEEE80211_RADIOTAP_FLAGS */
 242         if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
 243                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 244         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 245                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 246         if (status->flag & RX_FLAG_SHORTPRE)
 247                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 248         pos++;
 249
 250         /* IEEE80211_RADIOTAP_RATE */
 251         if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
 252                 /*
 253                  * Without rate information don't add it. If we have,
 254                  * MCS information is a separate field in radiotap,
 255                  * added below. The byte here is needed as padding
 256                  * for the channel though, so initialise it to 0.
 257                  */
 258                 *pos = 0;
 259         } else {
 260                 int shift = 0;
 261                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 262                 if (status->flag & RX_FLAG_10MHZ)
 263                         shift = 1;
 264                 else if (status->flag & RX_FLAG_5MHZ)
 265                         shift = 2;
 266                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
 267         }
 268         pos++;
 269
 270         /* IEEE80211_RADIOTAP_CHANNEL */
 271         put_unaligned_le16(status->freq, pos);
 272         pos += 2;
 273         if (status->flag & RX_FLAG_10MHZ)
 274                 channel_flags |= IEEE80211_CHAN_HALF;
 275         else if (status->flag & RX_FLAG_5MHZ)
 276                 channel_flags |= IEEE80211_CHAN_QUARTER;
 277
 278         if (status->band == IEEE80211_BAND_5GHZ)
 279                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 280         else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
 281                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 282         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 283                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 284         else if (rate)
 285                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
 286         else
 287                 channel_flags |= IEEE80211_CHAN_2GHZ;
 288         put_unaligned_le16(channel_flags, pos);
 289         pos += 2;
 290
 291         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 292         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
 293             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 294                 *pos = status->signal;
 295                 rthdr->it_present |=
 296                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 297                 pos++;
 298         }
 299
 300         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 301
 302         if (!status->chains) {
 303                 /* IEEE80211_RADIOTAP_ANTENNA */
 304                 *pos = status->antenna;
 305                 pos++;
 306         }
 307
 308         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 309
 310         /* IEEE80211_RADIOTAP_RX_FLAGS */
 311         /* ensure 2 byte alignment for the 2 byte field as required */
 312         if ((pos - (u8 *)rthdr) & 1)
 313                 *pos++ = 0;
 314         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 315                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 316         put_unaligned_le16(rx_flags, pos);
 317         pos += 2;
 318
 319         if (status->flag & RX_FLAG_HT) {
 320                 unsigned int stbc;
 321
 322                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 323                 *pos++ = local->hw.radiotap_mcs_details;
 324                 *pos = 0;
 325                 if (status->flag & RX_FLAG_SHORT_GI)
 326                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 327                 if (status->flag & RX_FLAG_40MHZ)
 328                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 329                 if (status->flag & RX_FLAG_HT_GF)
 330                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 331                 if (status->flag & RX_FLAG_LDPC)
 332                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
 333                 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
 334                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 335                 pos++;
 336                 *pos++ = status->rate_idx;
 337         }
 338
 339         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 340                 u16 flags = 0;
 341
 342                 /* ensure 4 byte alignment */
 343                 while ((pos - (u8 *)rthdr) & 3)
 344                         pos++;
 345                 rthdr->it_present |=
 346                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 347                 put_unaligned_le32(status->ampdu_reference, pos);
 348                 pos += 4;
 349                 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
 350                         flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
 351                 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
 352                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
 353                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 354                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 355                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 356                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 357                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 358                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 359                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 360                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 361                 put_unaligned_le16(flags, pos);
 362                 pos += 2;
 363                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 364                         *pos++ = status->ampdu_delimiter_crc;
 365                 else
 366                         *pos++ = 0;
 367                 *pos++ = 0;
 368         }
 369
 370         if (status->flag & RX_FLAG_VHT) {
 371                 u16 known = local->hw.radiotap_vht_details;
 372
 373                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 374                 put_unaligned_le16(known, pos);
 375                 pos += 2;
 376                 /* flags */
 377                 if (status->flag & RX_FLAG_SHORT_GI)
 378                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 379                 /* in VHT, STBC is binary */
 380                 if (status->flag & RX_FLAG_STBC_MASK)
 381                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
 382                 if (status->vht_flag & RX_VHT_FLAG_BF)
 383                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
 384                 pos++;
 385                 /* bandwidth */
 386                 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
 387                         *pos++ = 4;
 388                 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
 389                         *pos++ = 11;
 390                 else if (status->flag & RX_FLAG_40MHZ)
 391                         *pos++ = 1;
 392                 else /* 20 MHz */
 393                         *pos++ = 0;
 394                 /* MCS/NSS */
 395                 *pos = (status->rate_idx << 4) | status->vht_nss;
 396                 pos += 4;
 397                 /* coding field */
 398                 if (status->flag & RX_FLAG_LDPC)
 399                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
 400                 pos++;
 401                 /* group ID */
 402                 pos++;
 403                 /* partial_aid */
 404                 pos += 2;
 405         }
 406
 407         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 408                 *pos++ = status->chain_signal[chain];
 409                 *pos++ = chain;
 410         }
 411
 412         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 413                 /* ensure 2 byte alignment for the vendor field as required */
 414                 if ((pos - (u8 *)rthdr) & 1)
 415                         *pos++ = 0;
 416                 *pos++ = rtap.oui[0];
 417                 *pos++ = rtap.oui[1];
 418                 *pos++ = rtap.oui[2];
 419                 *pos++ = rtap.subns;
 420                 put_unaligned_le16(rtap.len, pos);
 421                 pos += 2;
 422                 /* align the actual payload as requested */
 423                 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
 424                         *pos++ = 0;
 425                 /* data (and possible padding) already follows */
 426         }
 427 }
 428
 429 /*
 430  * This function copies a received frame to all monitor interfaces and
 431  * returns a cleaned-up SKB that no longer includes the FCS nor the
 432  * radiotap header the driver might have added.
 433  */
 434 static struct sk_buff *
 435 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 436                      struct ieee80211_rate *rate)
 437 {
 438         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 439         struct ieee80211_sub_if_data *sdata;
 440         int rt_hdrlen, needed_headroom;
 441         struct sk_buff *skb, *skb2;
 442         struct net_device *prev_dev = NULL;
 443         int present_fcs_len = 0;
 444         unsigned int rtap_vendor_space = 0;
 445
 446         if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
 447                 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
 448
 449                 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
 450         }
 451
 452         /*
 453          * First, we may need to make a copy of the skb because
 454          *  (1) we need to modify it for radiotap (if not present), and
 455          *  (2) the other RX handlers will modify the skb we got.
 456          *
 457          * We don't need to, of course, if we aren't going to return
 458          * the SKB because it has a bad FCS/PLCP checksum.
 459          */
 460
 461         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
 462                 present_fcs_len = FCS_LEN;
 463
 464         /* ensure hdr->frame_control and vendor radiotap data are in skb head */
 465         if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
 466                 dev_kfree_skb(origskb);
 467                 return NULL;
 468         }
 469
 470         if (!local->monitors) {
 471                 if (should_drop_frame(origskb, present_fcs_len,
 472                                       rtap_vendor_space)) {
 473                         dev_kfree_skb(origskb);
 474                         return NULL;
 475                 }
 476
 477                 return remove_monitor_info(local, origskb, rtap_vendor_space);
 478         }
 479
 480         /* room for the radiotap header based on driver features */
 481         rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
 482         needed_headroom = rt_hdrlen - rtap_vendor_space;
 483
 484         if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) {
 485                 /* only need to expand headroom if necessary */
 486                 skb = origskb;
 487                 origskb = NULL;
 488
 489                 /*
 490                  * This shouldn't trigger often because most devices have an
 491                  * RX header they pull before we get here, and that should
 492                  * be big enough for our radiotap information. We should
 493                  * probably export the length to drivers so that we can have
 494                  * them allocate enough headroom to start with.
 495                  */
 496                 if (skb_headroom(skb) < needed_headroom &&
 497                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 498                         dev_kfree_skb(skb);
 499                         return NULL;
 500                 }
 501         } else {
 502                 /*
 503                  * Need to make a copy and possibly remove radiotap header
 504                  * and FCS from the original.
 505                  */
 506                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
 507
 508                 origskb = remove_monitor_info(local, origskb,
 509                                               rtap_vendor_space);
 510
 511                 if (!skb)
 512                         return origskb;
 513         }
 514
 515         /* prepend radiotap information */
 516         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
 517
 518         skb_reset_mac_header(skb);
 519         skb->ip_summed = CHECKSUM_UNNECESSARY;
 520         skb->pkt_type = PACKET_OTHERHOST;
 521         skb->protocol = htons(ETH_P_802_2);
 522
 523         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 524                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
 525                         continue;
 526
 527                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
 528                         continue;
 529
 530                 if (!ieee80211_sdata_running(sdata))
 531                         continue;
 532
 533                 if (prev_dev) {
 534                         skb2 = skb_clone(skb, GFP_ATOMIC);
 535                         if (skb2) {
 536                                 skb2->dev = prev_dev;
 537                                 netif_receive_skb(skb2);
 538                         }
 539                 }
 540
 541                 prev_dev = sdata->dev;
 542                 ieee80211_rx_stats(sdata->dev, skb->len);
 543         }
 544
 545         if (prev_dev) {
 546                 skb->dev = prev_dev;
 547                 netif_receive_skb(skb);
 548         } else
 549                 dev_kfree_skb(skb);
 550
 551         return origskb;
 552 }
 553
 554 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 555 {
 556         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 557         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 558         int tid, seqno_idx, security_idx;
 559
 560         /* does the frame have a qos control field? */
 561         if (ieee80211_is_data_qos(hdr->frame_control)) {
 562                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 563                 /* frame has qos control */
 564                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 565                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 566                         status->rx_flags |= IEEE80211_RX_AMSDU;
 567
 568                 seqno_idx = tid;
 569                 security_idx = tid;
 570         } else {
 571                 /*
 572                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 573                  *
 574                  *      Sequence numbers for management frames, QoS data
 575                  *      frames with a broadcast/multicast address in the
 576                  *      Address 1 field, and all non-QoS data frames sent
 577                  *      by QoS STAs are assigned using an additional single
 578                  *      modulo-4096 counter, [...]
 579                  *
 580                  * We also use that counter for non-QoS STAs.
 581                  */
 582                 seqno_idx = IEEE80211_NUM_TIDS;
 583                 security_idx = 0;
 584                 if (ieee80211_is_mgmt(hdr->frame_control))
 585                         security_idx = IEEE80211_NUM_TIDS;
 586                 tid = 0;
 587         }
 588
 589         rx->seqno_idx = seqno_idx;
 590         rx->security_idx = security_idx;
 591         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 592          * For now, set skb->priority to 0 for other cases. */
 593         rx->skb->priority = (tid > 7) ? 0 : tid;
 594 }
 595
 596 /**
 597  * DOC: Packet alignment
 598  *
 599  * Drivers always need to pass packets that are aligned to two-byte boundaries
 600  * to the stack.
 601  *
 602  * Additionally, should, if possible, align the payload data in a way that
 603  * guarantees that the contained IP header is aligned to a four-byte
 604  * boundary. In the case of regular frames, this simply means aligning the
 605  * payload to a four-byte boundary (because either the IP header is directly
 606  * contained, or IV/RFC1042 headers that have a length divisible by four are
 607  * in front of it).  If the payload data is not properly aligned and the
 608  * architecture doesn't support efficient unaligned operations, mac80211
 609  * will align the data.
 610  *
 611  * With A-MSDU frames, however, the payload data address must yield two modulo
 612  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 613  * push the IP header further back to a multiple of four again. Thankfully, the
 614  * specs were sane enough this time around to require padding each A-MSDU
 615  * subframe to a length that is a multiple of four.
 616  *
 617  * Padding like Atheros hardware adds which is between the 802.11 header and
 618  * the payload is not supported, the driver is required to move the 802.11
 619  * header to be directly in front of the payload in that case.
 620  */
 621 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 622 {
 623 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 624         WARN_ONCE((unsigned long)rx->skb->data & 1,
 625                   "unaligned packet at 0x%p\n", rx->skb->data);
 626 #endif
 627 }
 628
 629
 630 /* rx handlers */
 631
 632 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 633 {
 634         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 635
 636         if (is_multicast_ether_addr(hdr->addr1))
 637                 return 0;
 638
 639         return ieee80211_is_robust_mgmt_frame(skb);
 640 }
 641
 642
 643 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 644 {
 645         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 646
 647         if (!is_multicast_ether_addr(hdr->addr1))
 648                 return 0;
 649
 650         return ieee80211_is_robust_mgmt_frame(skb);
 651 }
 652
 653
 654 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 655 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 656 {
 657         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 658         struct ieee80211_mmie *mmie;
 659         struct ieee80211_mmie_16 *mmie16;
 660
 661         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 662                 return -1;
 663
 664         if (!ieee80211_is_robust_mgmt_frame(skb))
 665                 return -1; /* not a robust management frame */
 666
 667         mmie = (struct ieee80211_mmie *)
 668                 (skb->data + skb->len - sizeof(*mmie));
 669         if (mmie->element_id == WLAN_EID_MMIE &&
 670             mmie->length == sizeof(*mmie) - 2)
 671                 return le16_to_cpu(mmie->key_id);
 672
 673         mmie16 = (struct ieee80211_mmie_16 *)
 674                 (skb->data + skb->len - sizeof(*mmie16));
 675         if (skb->len >= 24 + sizeof(*mmie16) &&
 676             mmie16->element_id == WLAN_EID_MMIE &&
 677             mmie16->length == sizeof(*mmie16) - 2)
 678                 return le16_to_cpu(mmie16->key_id);
 679
 680         return -1;
 681 }
 682
 683 static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
 684                                  struct sk_buff *skb)
 685 {
 686         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 687         __le16 fc;
 688         int hdrlen;
 689         u8 keyid;
 690
 691         fc = hdr->frame_control;
 692         hdrlen = ieee80211_hdrlen(fc);
 693
 694         if (skb->len < hdrlen + cs->hdr_len)
 695                 return -EINVAL;
 696
 697         skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
 698         keyid &= cs->key_idx_mask;
 699         keyid >>= cs->key_idx_shift;
 700
 701         return keyid;
 702 }
 703
 704 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
 705 {
 706         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 707         char *dev_addr = rx->sdata->vif.addr;
 708
 709         if (ieee80211_is_data(hdr->frame_control)) {
 710                 if (is_multicast_ether_addr(hdr->addr1)) {
 711                         if (ieee80211_has_tods(hdr->frame_control) ||
 712                             !ieee80211_has_fromds(hdr->frame_control))
 713                                 return RX_DROP_MONITOR;
 714                         if (ether_addr_equal(hdr->addr3, dev_addr))
 715                                 return RX_DROP_MONITOR;
 716                 } else {
 717                         if (!ieee80211_has_a4(hdr->frame_control))
 718                                 return RX_DROP_MONITOR;
 719                         if (ether_addr_equal(hdr->addr4, dev_addr))
 720                                 return RX_DROP_MONITOR;
 721                 }
 722         }
 723
 724         /* If there is not an established peer link and this is not a peer link
 725          * establisment frame, beacon or probe, drop the frame.
 726          */
 727
 728         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
 729                 struct ieee80211_mgmt *mgmt;
 730
 731                 if (!ieee80211_is_mgmt(hdr->frame_control))
 732                         return RX_DROP_MONITOR;
 733
 734                 if (ieee80211_is_action(hdr->frame_control)) {
 735                         u8 category;
 736
 737                         /* make sure category field is present */
 738                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
 739                                 return RX_DROP_MONITOR;
 740
 741                         mgmt = (struct ieee80211_mgmt *)hdr;
 742                         category = mgmt->u.action.category;
 743                         if (category != WLAN_CATEGORY_MESH_ACTION &&
 744                             category != WLAN_CATEGORY_SELF_PROTECTED)
 745                                 return RX_DROP_MONITOR;
 746                         return RX_CONTINUE;
 747                 }
 748
 749                 if (ieee80211_is_probe_req(hdr->frame_control) ||
 750                     ieee80211_is_probe_resp(hdr->frame_control) ||
 751                     ieee80211_is_beacon(hdr->frame_control) ||
 752                     ieee80211_is_auth(hdr->frame_control))
 753                         return RX_CONTINUE;
 754
 755                 return RX_DROP_MONITOR;
 756         }
 757
 758         return RX_CONTINUE;
 759 }
 760
 761 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
 762                                             struct tid_ampdu_rx *tid_agg_rx,
 763                                             int index,
 764                                             struct sk_buff_head *frames)
 765 {
 766         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
 767         struct sk_buff *skb;
 768         struct ieee80211_rx_status *status;
 769
 770         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 771
 772         if (skb_queue_empty(skb_list))
 773                 goto no_frame;
 774
 775         if (!ieee80211_rx_reorder_ready(skb_list)) {
 776                 __skb_queue_purge(skb_list);
 777                 goto no_frame;
 778         }
 779
 780         /* release frames from the reorder ring buffer */
 781         tid_agg_rx->stored_mpdu_num--;
 782         while ((skb = __skb_dequeue(skb_list))) {
 783                 status = IEEE80211_SKB_RXCB(skb);
 784                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
 785                 __skb_queue_tail(frames, skb);
 786         }
 787
 788 no_frame:
 789         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 790 }
 791
 792 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
 793                                              struct tid_ampdu_rx *tid_agg_rx,
 794                                              u16 head_seq_num,
 795                                              struct sk_buff_head *frames)
 796 {
 797         int index;
 798
 799         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 800
 801         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
 802                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 803                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 804                                                 frames);
 805         }
 806 }
 807
 808 /*
 809  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
 810  * the skb was added to the buffer longer than this time ago, the earlier
 811  * frames that have not yet been received are assumed to be lost and the skb
 812  * can be released for processing. This may also release other skb's from the
 813  * reorder buffer if there are no additional gaps between the frames.
 814  *
 815  * Callers must hold tid_agg_rx->reorder_lock.
 816  */
 817 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
 818
 819 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
 820                                           struct tid_ampdu_rx *tid_agg_rx,
 821                                           struct sk_buff_head *frames)
 822 {
 823         int index, i, j;
 824
 825         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 826
 827         /* release the buffer until next missing frame */
 828         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 829         if (!ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index]) &&
 830             tid_agg_rx->stored_mpdu_num) {
 831                 /*
 832                  * No buffers ready to be released, but check whether any
 833                  * frames in the reorder buffer have timed out.
 834                  */
 835                 int skipped = 1;
 836                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
 837                      j = (j + 1) % tid_agg_rx->buf_size) {
 838                         if (!ieee80211_rx_reorder_ready(
 839                                         &tid_agg_rx->reorder_buf[j])) {
 840                                 skipped++;
 841                                 continue;
 842                         }
 843                         if (skipped &&
 844                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
 845                                         HT_RX_REORDER_BUF_TIMEOUT))
 846                                 goto set_release_timer;
 847
 848                         /* don't leave incomplete A-MSDUs around */
 849                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
 850                              i = (i + 1) % tid_agg_rx->buf_size)
 851                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
 852
 853                         ht_dbg_ratelimited(sdata,
 854                                            "release an RX reorder frame due to timeout on earlier frames\n");
 855                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
 856                                                         frames);
 857
 858                         /*
 859                          * Increment the head seq# also for the skipped slots.
 860                          */
 861                         tid_agg_rx->head_seq_num =
 862                                 (tid_agg_rx->head_seq_num +
 863                                  skipped) & IEEE80211_SN_MASK;
 864                         skipped = 0;
 865                 }
 866         } else while (ieee80211_rx_reorder_ready(
 867                                 &tid_agg_rx->reorder_buf[index])) {
 868                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 869                                                 frames);
 870                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 871         }
 872
 873         if (tid_agg_rx->stored_mpdu_num) {
 874                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 875
 876                 for (; j != (index - 1) % tid_agg_rx->buf_size;
 877                      j = (j + 1) % tid_agg_rx->buf_size) {
 878                         if (ieee80211_rx_reorder_ready(
 879                                         &tid_agg_rx->reorder_buf[j]))
 880                                 break;
 881                 }
 882
 883  set_release_timer:
 884
 885                 if (!tid_agg_rx->removed)
 886                         mod_timer(&tid_agg_rx->reorder_timer,
 887                                   tid_agg_rx->reorder_time[j] + 1 +
 888                                   HT_RX_REORDER_BUF_TIMEOUT);
 889         } else {
 890                 del_timer(&tid_agg_rx->reorder_timer);
 891         }
 892 }
 893
 894 /*
 895  * As this function belongs to the RX path it must be under
 896  * rcu_read_lock protection. It returns false if the frame
 897  * can be processed immediately, true if it was consumed.
 898  */
 899 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
 900                                              struct tid_ampdu_rx *tid_agg_rx,
 901                                              struct sk_buff *skb,
 902                                              struct sk_buff_head *frames)
 903 {
 904         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 905         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 906         u16 sc = le16_to_cpu(hdr->seq_ctrl);
 907         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
 908         u16 head_seq_num, buf_size;
 909         int index;
 910         bool ret = true;
 911
 912         spin_lock(&tid_agg_rx->reorder_lock);
 913
 914         /*
 915          * Offloaded BA sessions have no known starting sequence number so pick
 916          * one from first Rxed frame for this tid after BA was started.
 917          */
 918         if (unlikely(tid_agg_rx->auto_seq)) {
 919                 tid_agg_rx->auto_seq = false;
 920                 tid_agg_rx->ssn = mpdu_seq_num;
 921                 tid_agg_rx->head_seq_num = mpdu_seq_num;
 922         }
 923
 924         buf_size = tid_agg_rx->buf_size;
 925         head_seq_num = tid_agg_rx->head_seq_num;
 926
 927         /* frame with out of date sequence number */
 928         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
 929                 dev_kfree_skb(skb);
 930                 goto out;
 931         }
 932
 933         /*
 934          * If frame the sequence number exceeds our buffering window
 935          * size release some previous frames to make room for this one.
 936          */
 937         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
 938                 head_seq_num = ieee80211_sn_inc(
 939                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
 940                 /* release stored frames up to new head to stack */
 941                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
 942                                                  head_seq_num, frames);
 943         }
 944
 945         /* Now the new frame is always in the range of the reordering buffer */
 946
 947         index = mpdu_seq_num % tid_agg_rx->buf_size;
 948
 949         /* check if we already stored this frame */
 950         if (ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index])) {
 951                 dev_kfree_skb(skb);
 952                 goto out;
 953         }
 954
 955         /*
 956          * If the current MPDU is in the right order and nothing else
 957          * is stored we can process it directly, no need to buffer it.
 958          * If it is first but there's something stored, we may be able
 959          * to release frames after this one.
 960          */
 961         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
 962             tid_agg_rx->stored_mpdu_num == 0) {
 963                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
 964                         tid_agg_rx->head_seq_num =
 965                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 966                 ret = false;
 967                 goto out;
 968         }
 969
 970         /* put the frame in the reordering buffer */
 971         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
 972         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
 973                 tid_agg_rx->reorder_time[index] = jiffies;
 974                 tid_agg_rx->stored_mpdu_num++;
 975                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
 976         }
 977
 978  out:
 979         spin_unlock(&tid_agg_rx->reorder_lock);
 980         return ret;
 981 }
 982
 983 /*
 984  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
 985  * true if the MPDU was buffered, false if it should be processed.
 986  */
 987 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
 988                                        struct sk_buff_head *frames)
 989 {
 990         struct sk_buff *skb = rx->skb;
 991         struct ieee80211_local *local = rx->local;
 992         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 993         struct sta_info *sta = rx->sta;
 994         struct tid_ampdu_rx *tid_agg_rx;
 995         u16 sc;
 996         u8 tid, ack_policy;
 997
 998         if (!ieee80211_is_data_qos(hdr->frame_control) ||
 999             is_multicast_ether_addr(hdr->addr1))
1000                 goto dont_reorder;
1001
1002         /*
1003          * filter the QoS data rx stream according to
1004          * STA/TID and check if this STA/TID is on aggregation
1005          */
1006
1007         if (!sta)
1008                 goto dont_reorder;
1009
1010         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1011                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1012         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1013
1014         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1015         if (!tid_agg_rx)
1016                 goto dont_reorder;
1017
1018         /* qos null data frames are excluded */
1019         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1020                 goto dont_reorder;
1021
1022         /* not part of a BA session */
1023         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1024             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1025                 goto dont_reorder;
1026
1027         /* new, potentially un-ordered, ampdu frame - process it */
1028
1029         /* reset session timer */
1030         if (tid_agg_rx->timeout)
1031                 tid_agg_rx->last_rx = jiffies;
1032
1033         /* if this mpdu is fragmented - terminate rx aggregation session */
1034         sc = le16_to_cpu(hdr->seq_ctrl);
1035         if (sc & IEEE80211_SCTL_FRAG) {
1036                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
1037                 skb_queue_tail(&rx->sdata->skb_queue, skb);
1038                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1039                 return;
1040         }
1041
1042         /*
1043          * No locking needed -- we will only ever process one
1044          * RX packet at a time, and thus own tid_agg_rx. All
1045          * other code manipulating it needs to (and does) make
1046          * sure that we cannot get to it any more before doing
1047          * anything with it.
1048          */
1049         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1050                                              frames))
1051                 return;
1052
1053  dont_reorder:
1054         __skb_queue_tail(frames, skb);
1055 }
1056
1057 static ieee80211_rx_result debug_noinline
1058 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1059 {
1060         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1061         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1062
1063         /*
1064          * Drop duplicate 802.11 retransmissions
1065          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1066          */
1067
1068         if (rx->skb->len < 24)
1069                 return RX_CONTINUE;
1070
1071         if (ieee80211_is_ctl(hdr->frame_control) ||
1072             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1073             is_multicast_ether_addr(hdr->addr1))
1074                 return RX_CONTINUE;
1075
1076         if (rx->sta) {
1077                 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1078                              rx->sta->last_seq_ctrl[rx->seqno_idx] ==
1079                              hdr->seq_ctrl)) {
1080                         I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1081                         rx->sta->num_duplicates++;
1082                         return RX_DROP_UNUSABLE;
1083                 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1084                         rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1085                 }
1086         }
1087
1088         return RX_CONTINUE;
1089 }
1090
1091 static ieee80211_rx_result debug_noinline
1092 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1093 {
1094         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1095
1096         if (unlikely(rx->skb->len < 16)) {
1097                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
1098                 return RX_DROP_MONITOR;
1099         }
1100
1101         /* Drop disallowed frame classes based on STA auth/assoc state;
1102          * IEEE 802.11, Chap 5.5.
1103          *
1104          * mac80211 filters only based on association state, i.e. it drops
1105          * Class 3 frames from not associated stations. hostapd sends
1106          * deauth/disassoc frames when needed. In addition, hostapd is
1107          * responsible for filtering on both auth and assoc states.
1108          */
1109
1110         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1111                 return ieee80211_rx_mesh_check(rx);
1112
1113         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1114                       ieee80211_is_pspoll(hdr->frame_control)) &&
1115                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1116                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1117                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1118                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1119                 /*
1120                  * accept port control frames from the AP even when it's not
1121                  * yet marked ASSOC to prevent a race where we don't set the
1122                  * assoc bit quickly enough before it sends the first frame
1123                  */
1124                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1125                     ieee80211_is_data_present(hdr->frame_control)) {
1126                         unsigned int hdrlen;
1127                         __be16 ethertype;
1128
1129                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1130
1131                         if (rx->skb->len < hdrlen + 8)
1132                                 return RX_DROP_MONITOR;
1133
1134                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1135                         if (ethertype == rx->sdata->control_port_protocol)
1136                                 return RX_CONTINUE;
1137                 }
1138
1139                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1140                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1141                                                hdr->addr2,
1142                                                GFP_ATOMIC))
1143                         return RX_DROP_UNUSABLE;
1144
1145                 return RX_DROP_MONITOR;
1146         }
1147
1148         return RX_CONTINUE;
1149 }
1150
1151
1152 static ieee80211_rx_result debug_noinline
1153 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1154 {
1155         struct ieee80211_local *local;
1156         struct ieee80211_hdr *hdr;
1157         struct sk_buff *skb;
1158
1159         local = rx->local;
1160         skb = rx->skb;
1161         hdr = (struct ieee80211_hdr *) skb->data;
1162
1163         if (!local->pspolling)
1164                 return RX_CONTINUE;
1165
1166         if (!ieee80211_has_fromds(hdr->frame_control))
1167                 /* this is not from AP */
1168                 return RX_CONTINUE;
1169
1170         if (!ieee80211_is_data(hdr->frame_control))
1171                 return RX_CONTINUE;
1172
1173         if (!ieee80211_has_moredata(hdr->frame_control)) {
1174                 /* AP has no more frames buffered for us */
1175                 local->pspolling = false;
1176                 return RX_CONTINUE;
1177         }
1178
1179         /* more data bit is set, let's request a new frame from the AP */
1180         ieee80211_send_pspoll(local, rx->sdata);
1181
1182         return RX_CONTINUE;
1183 }
1184
1185 static void sta_ps_start(struct sta_info *sta)
1186 {
1187         struct ieee80211_sub_if_data *sdata = sta->sdata;
1188         struct ieee80211_local *local = sdata->local;
1189         struct ps_data *ps;
1190         int tid;
1191
1192         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1193             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1194                 ps = &sdata->bss->ps;
1195         else
1196                 return;
1197
1198         atomic_inc(&ps->num_sta_ps);
1199         set_sta_flag(sta, WLAN_STA_PS_STA);
1200         if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1201                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1202         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1203                sta->sta.addr, sta->sta.aid);
1204
1205         ieee80211_clear_fast_xmit(sta);
1206
1207         if (!sta->sta.txq[0])
1208                 return;
1209
1210         for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1211                 struct txq_info *txqi = to_txq_info(sta->sta.txq[tid]);
1212
1213                 if (!skb_queue_len(&txqi->queue))
1214                         set_bit(tid, &sta->txq_buffered_tids);
1215                 else
1216                         clear_bit(tid, &sta->txq_buffered_tids);
1217         }
1218 }
1219
1220 static void sta_ps_end(struct sta_info *sta)
1221 {
1222         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1223                sta->sta.addr, sta->sta.aid);
1224
1225         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1226                 /*
1227                  * Clear the flag only if the other one is still set
1228                  * so that the TX path won't start TX'ing new frames
1229                  * directly ... In the case that the driver flag isn't
1230                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1231                  */
1232                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1233                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1234                        sta->sta.addr, sta->sta.aid);
1235                 return;
1236         }
1237
1238         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1239         clear_sta_flag(sta, WLAN_STA_PS_STA);
1240         ieee80211_sta_ps_deliver_wakeup(sta);
1241 }
1242
1243 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1244 {
1245         struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1246         bool in_ps;
1247
1248         WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1249
1250         /* Don't let the same PS state be set twice */
1251         in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1252         if ((start && in_ps) || (!start && !in_ps))
1253                 return -EINVAL;
1254
1255         if (start)
1256                 sta_ps_start(sta_inf);
1257         else
1258                 sta_ps_end(sta_inf);
1259
1260         return 0;
1261 }
1262 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1263
1264 static ieee80211_rx_result debug_noinline
1265 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1266 {
1267         struct ieee80211_sub_if_data *sdata = rx->sdata;
1268         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1269         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1270         int tid, ac;
1271
1272         if (!rx->sta)
1273                 return RX_CONTINUE;
1274
1275         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1276             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1277                 return RX_CONTINUE;
1278
1279         /*
1280          * The device handles station powersave, so don't do anything about
1281          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1282          * it to mac80211 since they're handled.)
1283          */
1284         if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1285                 return RX_CONTINUE;
1286
1287         /*
1288          * Don't do anything if the station isn't already asleep. In
1289          * the uAPSD case, the station will probably be marked asleep,
1290          * in the PS-Poll case the station must be confused ...
1291          */
1292         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1293                 return RX_CONTINUE;
1294
1295         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1296                 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1297                         if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1298                                 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1299                         else
1300                                 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1301                 }
1302
1303                 /* Free PS Poll skb here instead of returning RX_DROP that would
1304                  * count as an dropped frame. */
1305                 dev_kfree_skb(rx->skb);
1306
1307                 return RX_QUEUED;
1308         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1309                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1310                    ieee80211_has_pm(hdr->frame_control) &&
1311                    (ieee80211_is_data_qos(hdr->frame_control) ||
1312                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1313                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1314                 ac = ieee802_1d_to_ac[tid & 7];
1315
1316                 /*
1317                  * If this AC is not trigger-enabled do nothing.
1318                  *
1319                  * NB: This could/should check a separate bitmap of trigger-
1320                  * enabled queues, but for now we only implement uAPSD w/o
1321                  * TSPEC changes to the ACs, so they're always the same.
1322                  */
1323                 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1324                         return RX_CONTINUE;
1325
1326                 /* if we are in a service period, do nothing */
1327                 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1328                         return RX_CONTINUE;
1329
1330                 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1331                         ieee80211_sta_ps_deliver_uapsd(rx->sta);
1332                 else
1333                         set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1334         }
1335
1336         return RX_CONTINUE;
1337 }
1338
1339 static ieee80211_rx_result debug_noinline
1340 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1341 {
1342         struct sta_info *sta = rx->sta;
1343         struct sk_buff *skb = rx->skb;
1344         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1345         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1346         int i;
1347
1348         if (!sta)
1349                 return RX_CONTINUE;
1350
1351         /*
1352          * Update last_rx only for IBSS packets which are for the current
1353          * BSSID and for station already AUTHORIZED to avoid keeping the
1354          * current IBSS network alive in cases where other STAs start
1355          * using different BSSID. This will also give the station another
1356          * chance to restart the authentication/authorization in case
1357          * something went wrong the first time.
1358          */
1359         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1360                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1361                                                 NL80211_IFTYPE_ADHOC);
1362                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1363                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1364                         sta->last_rx = jiffies;
1365                         if (ieee80211_is_data(hdr->frame_control) &&
1366                             !is_multicast_ether_addr(hdr->addr1)) {
1367                                 sta->last_rx_rate_idx = status->rate_idx;
1368                                 sta->last_rx_rate_flag = status->flag;
1369                                 sta->last_rx_rate_vht_flag = status->vht_flag;
1370                                 sta->last_rx_rate_vht_nss = status->vht_nss;
1371                         }
1372                 }
1373         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1374                 sta->last_rx = jiffies;
1375         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1376                 /*
1377                  * Mesh beacons will update last_rx when if they are found to
1378                  * match the current local configuration when processed.
1379                  */
1380                 sta->last_rx = jiffies;
1381                 if (ieee80211_is_data(hdr->frame_control)) {
1382                         sta->last_rx_rate_idx = status->rate_idx;
1383                         sta->last_rx_rate_flag = status->flag;
1384                         sta->last_rx_rate_vht_flag = status->vht_flag;
1385                         sta->last_rx_rate_vht_nss = status->vht_nss;
1386                 }
1387         }
1388
1389         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1390                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1391
1392         sta->rx_fragments++;
1393         sta->rx_bytes += rx->skb->len;
1394         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1395                 sta->last_signal = status->signal;
1396                 ewma_add(&sta->avg_signal, -status->signal);
1397         }
1398
1399         if (status->chains) {
1400                 sta->chains = status->chains;
1401                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1402                         int signal = status->chain_signal[i];
1403
1404                         if (!(status->chains & BIT(i)))
1405                                 continue;
1406
1407                         sta->chain_signal_last[i] = signal;
1408                         ewma_add(&sta->chain_signal_avg[i], -signal);
1409                 }
1410         }
1411
1412         /*
1413          * Change STA power saving mode only at the end of a frame
1414          * exchange sequence.
1415          */
1416         if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1417             !ieee80211_has_morefrags(hdr->frame_control) &&
1418             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1419             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1420              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1421             /* PM bit is only checked in frames where it isn't reserved,
1422              * in AP mode it's reserved in non-bufferable management frames
1423              * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1424              */
1425             (!ieee80211_is_mgmt(hdr->frame_control) ||
1426              ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1427                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1428                         if (!ieee80211_has_pm(hdr->frame_control))
1429                                 sta_ps_end(sta);
1430                 } else {
1431                         if (ieee80211_has_pm(hdr->frame_control))
1432                                 sta_ps_start(sta);
1433                 }
1434         }
1435
1436         /* mesh power save support */
1437         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1438                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1439
1440         /*
1441          * Drop (qos-)data::nullfunc frames silently, since they
1442          * are used only to control station power saving mode.
1443          */
1444         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1445             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1446                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1447
1448                 /*
1449                  * If we receive a 4-addr nullfunc frame from a STA
1450                  * that was not moved to a 4-addr STA vlan yet send
1451                  * the event to userspace and for older hostapd drop
1452                  * the frame to the monitor interface.
1453                  */
1454                 if (ieee80211_has_a4(hdr->frame_control) &&
1455                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1456                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1457                       !rx->sdata->u.vlan.sta))) {
1458                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1459                                 cfg80211_rx_unexpected_4addr_frame(
1460                                         rx->sdata->dev, sta->sta.addr,
1461                                         GFP_ATOMIC);
1462                         return RX_DROP_MONITOR;
1463                 }
1464                 /*
1465                  * Update counter and free packet here to avoid
1466                  * counting this as a dropped packed.
1467                  */
1468                 sta->rx_packets++;
1469                 dev_kfree_skb(rx->skb);
1470                 return RX_QUEUED;
1471         }
1472
1473         return RX_CONTINUE;
1474 } /* ieee80211_rx_h_sta_process */
1475
1476 static ieee80211_rx_result debug_noinline
1477 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1478 {
1479         struct sk_buff *skb = rx->skb;
1480         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1481         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1482         int keyidx;
1483         int hdrlen;
1484         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1485         struct ieee80211_key *sta_ptk = NULL;
1486         int mmie_keyidx = -1;
1487         __le16 fc;
1488         const struct ieee80211_cipher_scheme *cs = NULL;
1489
1490         /*
1491          * Key selection 101
1492          *
1493          * There are four types of keys:
1494          *  - GTK (group keys)
1495          *  - IGTK (group keys for management frames)
1496          *  - PTK (pairwise keys)
1497          *  - STK (station-to-station pairwise keys)
1498          *
1499          * When selecting a key, we have to distinguish between multicast
1500          * (including broadcast) and unicast frames, the latter can only
1501          * use PTKs and STKs while the former always use GTKs and IGTKs.
1502          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1503          * unicast frames can also use key indices like GTKs. Hence, if we
1504          * don't have a PTK/STK we check the key index for a WEP key.
1505          *
1506          * Note that in a regular BSS, multicast frames are sent by the
1507          * AP only, associated stations unicast the frame to the AP first
1508          * which then multicasts it on their behalf.
1509          *
1510          * There is also a slight problem in IBSS mode: GTKs are negotiated
1511          * with each station, that is something we don't currently handle.
1512          * The spec seems to expect that one negotiates the same key with
1513          * every station but there's no such requirement; VLANs could be
1514          * possible.
1515          */
1516
1517         /* start without a key */
1518         rx->key = NULL;
1519         fc = hdr->frame_control;
1520
1521         if (rx->sta) {
1522                 int keyid = rx->sta->ptk_idx;
1523
1524                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1525                         cs = rx->sta->cipher_scheme;
1526                         keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1527                         if (unlikely(keyid < 0))
1528                                 return RX_DROP_UNUSABLE;
1529                 }
1530                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1531         }
1532
1533         if (!ieee80211_has_protected(fc))
1534                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1535
1536         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1537                 rx->key = sta_ptk;
1538                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1539                     (status->flag & RX_FLAG_IV_STRIPPED))
1540                         return RX_CONTINUE;
1541                 /* Skip decryption if the frame is not protected. */
1542                 if (!ieee80211_has_protected(fc))
1543                         return RX_CONTINUE;
1544         } else if (mmie_keyidx >= 0) {
1545                 /* Broadcast/multicast robust management frame / BIP */
1546                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1547                     (status->flag & RX_FLAG_IV_STRIPPED))
1548                         return RX_CONTINUE;
1549
1550                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1551                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1552                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1553                 if (rx->sta)
1554                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1555                 if (!rx->key)
1556                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1557         } else if (!ieee80211_has_protected(fc)) {
1558                 /*
1559                  * The frame was not protected, so skip decryption. However, we
1560                  * need to set rx->key if there is a key that could have been
1561                  * used so that the frame may be dropped if encryption would
1562                  * have been expected.
1563                  */
1564                 struct ieee80211_key *key = NULL;
1565                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1566                 int i;
1567
1568                 if (ieee80211_is_mgmt(fc) &&
1569                     is_multicast_ether_addr(hdr->addr1) &&
1570                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1571                         rx->key = key;
1572                 else {
1573                         if (rx->sta) {
1574                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1575                                         key = rcu_dereference(rx->sta->gtk[i]);
1576                                         if (key)
1577                                                 break;
1578                                 }
1579                         }
1580                         if (!key) {
1581                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1582                                         key = rcu_dereference(sdata->keys[i]);
1583                                         if (key)
1584                                                 break;
1585                                 }
1586                         }
1587                         if (key)
1588                                 rx->key = key;
1589                 }
1590                 return RX_CONTINUE;
1591         } else {
1592                 u8 keyid;
1593
1594                 /*
1595                  * The device doesn't give us the IV so we won't be
1596                  * able to look up the key. That's ok though, we
1597                  * don't need to decrypt the frame, we just won't
1598                  * be able to keep statistics accurate.
1599                  * Except for key threshold notifications, should
1600                  * we somehow allow the driver to tell us which key
1601                  * the hardware used if this flag is set?
1602                  */
1603                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1604                     (status->flag & RX_FLAG_IV_STRIPPED))
1605                         return RX_CONTINUE;
1606
1607                 hdrlen = ieee80211_hdrlen(fc);
1608
1609                 if (cs) {
1610                         keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
1611
1612                         if (unlikely(keyidx < 0))
1613                                 return RX_DROP_UNUSABLE;
1614                 } else {
1615                         if (rx->skb->len < 8 + hdrlen)
1616                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1617                         /*
1618                          * no need to call ieee80211_wep_get_keyidx,
1619                          * it verifies a bunch of things we've done already
1620                          */
1621                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1622                         keyidx = keyid >> 6;
1623                 }
1624
1625                 /* check per-station GTK first, if multicast packet */
1626                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1627                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1628
1629                 /* if not found, try default key */
1630                 if (!rx->key) {
1631                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1632
1633                         /*
1634                          * RSNA-protected unicast frames should always be
1635                          * sent with pairwise or station-to-station keys,
1636                          * but for WEP we allow using a key index as well.
1637                          */
1638                         if (rx->key &&
1639                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1640                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1641                             !is_multicast_ether_addr(hdr->addr1))
1642                                 rx->key = NULL;
1643                 }
1644         }
1645
1646         if (rx->key) {
1647                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1648                         return RX_DROP_MONITOR;
1649
1650                 rx->key->tx_rx_count++;
1651                 /* TODO: add threshold stuff again */
1652         } else {
1653                 return RX_DROP_MONITOR;
1654         }
1655
1656         switch (rx->key->conf.cipher) {
1657         case WLAN_CIPHER_SUITE_WEP40:
1658         case WLAN_CIPHER_SUITE_WEP104:
1659                 result = ieee80211_crypto_wep_decrypt(rx);
1660                 break;
1661         case WLAN_CIPHER_SUITE_TKIP:
1662                 result = ieee80211_crypto_tkip_decrypt(rx);
1663                 break;
1664         case WLAN_CIPHER_SUITE_CCMP:
1665                 result = ieee80211_crypto_ccmp_decrypt(
1666                         rx, IEEE80211_CCMP_MIC_LEN);
1667                 break;
1668         case WLAN_CIPHER_SUITE_CCMP_256:
1669                 result = ieee80211_crypto_ccmp_decrypt(
1670                         rx, IEEE80211_CCMP_256_MIC_LEN);
1671                 break;
1672         case WLAN_CIPHER_SUITE_AES_CMAC:
1673                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1674                 break;
1675         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1676                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1677                 break;
1678         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1679         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1680                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1681                 break;
1682         case WLAN_CIPHER_SUITE_GCMP:
1683         case WLAN_CIPHER_SUITE_GCMP_256:
1684                 result = ieee80211_crypto_gcmp_decrypt(rx);
1685                 break;
1686         default:
1687                 result = ieee80211_crypto_hw_decrypt(rx);
1688         }
1689
1690         /* the hdr variable is invalid after the decrypt handlers */
1691
1692         /* either the frame has been decrypted or will be dropped */
1693         status->flag |= RX_FLAG_DECRYPTED;
1694
1695         return result;
1696 }
1697
1698 static inline struct ieee80211_fragment_entry *
1699 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1700                          unsigned int frag, unsigned int seq, int rx_queue,
1701                          struct sk_buff **skb)
1702 {
1703         struct ieee80211_fragment_entry *entry;
1704
1705         entry = &sdata->fragments[sdata->fragment_next++];
1706         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1707                 sdata->fragment_next = 0;
1708
1709         if (!skb_queue_empty(&entry->skb_list))
1710                 __skb_queue_purge(&entry->skb_list);
1711
1712         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1713         *skb = NULL;
1714         entry->first_frag_time = jiffies;
1715         entry->seq = seq;
1716         entry->rx_queue = rx_queue;
1717         entry->last_frag = frag;
1718         entry->ccmp = 0;
1719         entry->extra_len = 0;
1720
1721         return entry;
1722 }
1723
1724 static inline struct ieee80211_fragment_entry *
1725 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1726                           unsigned int frag, unsigned int seq,
1727                           int rx_queue, struct ieee80211_hdr *hdr)
1728 {
1729         struct ieee80211_fragment_entry *entry;
1730         int i, idx;
1731
1732         idx = sdata->fragment_next;
1733         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1734                 struct ieee80211_hdr *f_hdr;
1735
1736                 idx--;
1737                 if (idx < 0)
1738                         idx = IEEE80211_FRAGMENT_MAX - 1;
1739
1740                 entry = &sdata->fragments[idx];
1741                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1742                     entry->rx_queue != rx_queue ||
1743                     entry->last_frag + 1 != frag)
1744                         continue;
1745
1746                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1747
1748                 /*
1749                  * Check ftype and addresses are equal, else check next fragment
1750                  */
1751                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1752                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1753                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1754                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1755                         continue;
1756
1757                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1758                         __skb_queue_purge(&entry->skb_list);
1759                         continue;
1760                 }
1761                 return entry;
1762         }
1763
1764         return NULL;
1765 }
1766
1767 static ieee80211_rx_result debug_noinline
1768 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1769 {
1770         struct ieee80211_hdr *hdr;
1771         u16 sc;
1772         __le16 fc;
1773         unsigned int frag, seq;
1774         struct ieee80211_fragment_entry *entry;
1775         struct sk_buff *skb;
1776         struct ieee80211_rx_status *status;
1777
1778         hdr = (struct ieee80211_hdr *)rx->skb->data;
1779         fc = hdr->frame_control;
1780
1781         if (ieee80211_is_ctl(fc))
1782                 return RX_CONTINUE;
1783
1784         sc = le16_to_cpu(hdr->seq_ctrl);
1785         frag = sc & IEEE80211_SCTL_FRAG;
1786
1787         if (is_multicast_ether_addr(hdr->addr1)) {
1788                 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
1789                 goto out_no_led;
1790         }
1791
1792         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1793                 goto out;
1794
1795         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1796
1797         if (skb_linearize(rx->skb))
1798                 return RX_DROP_UNUSABLE;
1799
1800         /*
1801          *  skb_linearize() might change the skb->data and
1802          *  previously cached variables (in this case, hdr) need to
1803          *  be refreshed with the new data.
1804          */
1805         hdr = (struct ieee80211_hdr *)rx->skb->data;
1806         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1807
1808         if (frag == 0) {
1809                 /* This is the first fragment of a new frame. */
1810                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1811                                                  rx->seqno_idx, &(rx->skb));
1812                 if (rx->key &&
1813                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
1814                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256) &&
1815                     ieee80211_has_protected(fc)) {
1816                         int queue = rx->security_idx;
1817                         /* Store CCMP PN so that we can verify that the next
1818                          * fragment has a sequential PN value. */
1819                         entry->ccmp = 1;
1820                         memcpy(entry->last_pn,
1821                                rx->key->u.ccmp.rx_pn[queue],
1822                                IEEE80211_CCMP_PN_LEN);
1823                 }
1824                 return RX_QUEUED;
1825         }
1826
1827         /* This is a fragment for a frame that should already be pending in
1828          * fragment cache. Add this fragment to the end of the pending entry.
1829          */
1830         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1831                                           rx->seqno_idx, hdr);
1832         if (!entry) {
1833                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1834                 return RX_DROP_MONITOR;
1835         }
1836
1837         /* Verify that MPDUs within one MSDU have sequential PN values.
1838          * (IEEE 802.11i, 8.3.3.4.5) */
1839         if (entry->ccmp) {
1840                 int i;
1841                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1842                 int queue;
1843                 if (!rx->key ||
1844                     (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
1845                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256))
1846                         return RX_DROP_UNUSABLE;
1847                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1848                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1849                         pn[i]++;
1850                         if (pn[i])
1851                                 break;
1852                 }
1853                 queue = rx->security_idx;
1854                 rpn = rx->key->u.ccmp.rx_pn[queue];
1855                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1856                         return RX_DROP_UNUSABLE;
1857                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1858         }
1859
1860         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1861         __skb_queue_tail(&entry->skb_list, rx->skb);
1862         entry->last_frag = frag;
1863         entry->extra_len += rx->skb->len;
1864         if (ieee80211_has_morefrags(fc)) {
1865                 rx->skb = NULL;
1866                 return RX_QUEUED;
1867         }
1868
1869         rx->skb = __skb_dequeue(&entry->skb_list);
1870         if (skb_tailroom(rx->skb) < entry->extra_len) {
1871                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
1872                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1873                                               GFP_ATOMIC))) {
1874                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1875                         __skb_queue_purge(&entry->skb_list);
1876                         return RX_DROP_UNUSABLE;
1877                 }
1878         }
1879         while ((skb = __skb_dequeue(&entry->skb_list))) {
1880                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1881                 dev_kfree_skb(skb);
1882         }
1883
1884         /* Complete frame has been reassembled - process it now */
1885         status = IEEE80211_SKB_RXCB(rx->skb);
1886         status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1887
1888  out:
1889         ieee80211_led_rx(rx->local);
1890  out_no_led:
1891         if (rx->sta)
1892                 rx->sta->rx_packets++;
1893         return RX_CONTINUE;
1894 }
1895
1896 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1897 {
1898         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1899                 return -EACCES;
1900
1901         return 0;
1902 }
1903
1904 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1905 {
1906         struct sk_buff *skb = rx->skb;
1907         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1908
1909         /*
1910          * Pass through unencrypted frames if the hardware has
1911          * decrypted them already.
1912          */
1913         if (status->flag & RX_FLAG_DECRYPTED)
1914                 return 0;
1915
1916         /* Drop unencrypted frames if key is set. */
1917         if (unlikely(!ieee80211_has_protected(fc) &&
1918                      !ieee80211_is_nullfunc(fc) &&
1919                      ieee80211_is_data(fc) && rx->key))
1920                 return -EACCES;
1921
1922         return 0;
1923 }
1924
1925 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1926 {
1927         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1928         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1929         __le16 fc = hdr->frame_control;
1930
1931         /*
1932          * Pass through unencrypted frames if the hardware has
1933          * decrypted them already.
1934          */
1935         if (status->flag & RX_FLAG_DECRYPTED)
1936                 return 0;
1937
1938         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1939                 if (unlikely(!ieee80211_has_protected(fc) &&
1940                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1941                              rx->key)) {
1942                         if (ieee80211_is_deauth(fc) ||
1943                             ieee80211_is_disassoc(fc))
1944                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1945                                                              rx->skb->data,
1946                                                              rx->skb->len);
1947                         return -EACCES;
1948                 }
1949                 /* BIP does not use Protected field, so need to check MMIE */
1950                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1951                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1952                         if (ieee80211_is_deauth(fc) ||
1953                             ieee80211_is_disassoc(fc))
1954                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1955                                                              rx->skb->data,
1956                                                              rx->skb->len);
1957                         return -EACCES;
1958                 }
1959                 /*
1960                  * When using MFP, Action frames are not allowed prior to
1961                  * having configured keys.
1962                  */
1963                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1964                              ieee80211_is_robust_mgmt_frame(rx->skb)))
1965                         return -EACCES;
1966         }
1967
1968         return 0;
1969 }
1970
1971 static int
1972 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1973 {
1974         struct ieee80211_sub_if_data *sdata = rx->sdata;
1975         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1976         bool check_port_control = false;
1977         struct ethhdr *ehdr;
1978         int ret;
1979
1980         *port_control = false;
1981         if (ieee80211_has_a4(hdr->frame_control) &&
1982             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1983                 return -1;
1984
1985         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1986             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1987
1988                 if (!sdata->u.mgd.use_4addr)
1989                         return -1;
1990                 else
1991                         check_port_control = true;
1992         }
1993
1994         if (is_multicast_ether_addr(hdr->addr1) &&
1995             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1996                 return -1;
1997
1998         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1999         if (ret < 0)
2000                 return ret;
2001
2002         ehdr = (struct ethhdr *) rx->skb->data;
2003         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2004                 *port_control = true;
2005         else if (check_port_control)
2006                 return -1;
2007
2008         return 0;
2009 }
2010
2011 /*
2012  * requires that rx->skb is a frame with ethernet header
2013  */
2014 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2015 {
2016         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2017                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2018         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2019
2020         /*
2021          * Allow EAPOL frames to us/the PAE group address regardless
2022          * of whether the frame was encrypted or not.
2023          */
2024         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2025             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2026              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2027                 return true;
2028
2029         if (ieee80211_802_1x_port_control(rx) ||
2030             ieee80211_drop_unencrypted(rx, fc))
2031                 return false;
2032
2033         return true;
2034 }
2035
2036 /*
2037  * requires that rx->skb is a frame with ethernet header
2038  */
2039 static void
2040 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2041 {
2042         struct ieee80211_sub_if_data *sdata = rx->sdata;
2043         struct net_device *dev = sdata->dev;
2044         struct sk_buff *skb, *xmit_skb;
2045         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2046         struct sta_info *dsta;
2047
2048         skb = rx->skb;
2049         xmit_skb = NULL;
2050
2051         ieee80211_rx_stats(dev, skb->len);
2052
2053         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2054              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2055             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2056             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2057                 if (is_multicast_ether_addr(ehdr->h_dest)) {
2058                         /*
2059                          * send multicast frames both to higher layers in
2060                          * local net stack and back to the wireless medium
2061                          */
2062                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2063                         if (!xmit_skb)
2064                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2065                                                     dev->name);
2066                 } else {
2067                         dsta = sta_info_get(sdata, skb->data);
2068                         if (dsta) {
2069                                 /*
2070                                  * The destination station is associated to
2071                                  * this AP (in this VLAN), so send the frame
2072                                  * directly to it and do not pass it to local
2073                                  * net stack.
2074                                  */
2075                                 xmit_skb = skb;
2076                                 skb = NULL;
2077                         }
2078                 }
2079         }
2080
2081 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2082         if (skb) {
2083                 /* 'align' will only take the values 0 or 2 here since all
2084                  * frames are required to be aligned to 2-byte boundaries
2085                  * when being passed to mac80211; the code here works just
2086                  * as well if that isn't true, but mac80211 assumes it can
2087                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2088                  */
2089                 int align;
2090
2091                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2092                 if (align) {
2093                         if (WARN_ON(skb_headroom(skb) < 3)) {
2094                                 dev_kfree_skb(skb);
2095                                 skb = NULL;
2096                         } else {
2097                                 u8 *data = skb->data;
2098                                 size_t len = skb_headlen(skb);
2099                                 skb->data -= align;
2100                                 memmove(skb->data, data, len);
2101                                 skb_set_tail_pointer(skb, len);
2102                         }
2103                 }
2104         }
2105 #endif
2106
2107         if (skb) {
2108                 /* deliver to local stack */
2109                 skb->protocol = eth_type_trans(skb, dev);
2110                 memset(skb->cb, 0, sizeof(skb->cb));
2111                 if (rx->local->napi)
2112                         napi_gro_receive(rx->local->napi, skb);
2113                 else
2114                         netif_receive_skb(skb);
2115         }
2116
2117         if (xmit_skb) {
2118                 /*
2119                  * Send to wireless media and increase priority by 256 to
2120                  * keep the received priority instead of reclassifying
2121                  * the frame (see cfg80211_classify8021d).
2122                  */
2123                 xmit_skb->priority += 256;
2124                 xmit_skb->protocol = htons(ETH_P_802_3);
2125                 skb_reset_network_header(xmit_skb);
2126                 skb_reset_mac_header(xmit_skb);
2127                 dev_queue_xmit(xmit_skb);
2128         }
2129 }
2130
2131 static ieee80211_rx_result debug_noinline
2132 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2133 {
2134         struct net_device *dev = rx->sdata->dev;
2135         struct sk_buff *skb = rx->skb;
2136         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2137         __le16 fc = hdr->frame_control;
2138         struct sk_buff_head frame_list;
2139         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2140
2141         if (unlikely(!ieee80211_is_data(fc)))
2142                 return RX_CONTINUE;
2143
2144         if (unlikely(!ieee80211_is_data_present(fc)))
2145                 return RX_DROP_MONITOR;
2146
2147         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2148                 return RX_CONTINUE;
2149
2150         if (ieee80211_has_a4(hdr->frame_control) &&
2151             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2152             !rx->sdata->u.vlan.sta)
2153                 return RX_DROP_UNUSABLE;
2154
2155         if (is_multicast_ether_addr(hdr->addr1) &&
2156             ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2157               rx->sdata->u.vlan.sta) ||
2158              (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2159               rx->sdata->u.mgd.use_4addr)))
2160                 return RX_DROP_UNUSABLE;
2161
2162         skb->dev = dev;
2163         __skb_queue_head_init(&frame_list);
2164
2165         if (skb_linearize(skb))
2166                 return RX_DROP_UNUSABLE;
2167
2168         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2169                                  rx->sdata->vif.type,
2170                                  rx->local->hw.extra_tx_headroom, true);
2171
2172         while (!skb_queue_empty(&frame_list)) {
2173                 rx->skb = __skb_dequeue(&frame_list);
2174
2175                 if (!ieee80211_frame_allowed(rx, fc)) {
2176                         dev_kfree_skb(rx->skb);
2177                         continue;
2178                 }
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_if_mesh *ifmsh = &sdata->u.mesh;
2197         u16 q, hdrlen;
2198
2199         hdr = (struct ieee80211_hdr *) skb->data;
2200         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2201
2202         /* make sure fixed part of mesh header is there, also checks skb len */
2203         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2204                 return RX_DROP_MONITOR;
2205
2206         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2207
2208         /* make sure full mesh header is there, also checks skb len */
2209         if (!pskb_may_pull(rx->skb,
2210                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2211                 return RX_DROP_MONITOR;
2212
2213         /* reload pointers */
2214         hdr = (struct ieee80211_hdr *) skb->data;
2215         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2216
2217         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2218                 return RX_DROP_MONITOR;
2219
2220         /* frame is in RMC, don't forward */
2221         if (ieee80211_is_data(hdr->frame_control) &&
2222             is_multicast_ether_addr(hdr->addr1) &&
2223             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2224                 return RX_DROP_MONITOR;
2225
2226         if (!ieee80211_is_data(hdr->frame_control))
2227                 return RX_CONTINUE;
2228
2229         if (!mesh_hdr->ttl)
2230                 return RX_DROP_MONITOR;
2231
2232         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2233                 struct mesh_path *mppath;
2234                 char *proxied_addr;
2235                 char *mpp_addr;
2236
2237                 if (is_multicast_ether_addr(hdr->addr1)) {
2238                         mpp_addr = hdr->addr3;
2239                         proxied_addr = mesh_hdr->eaddr1;
2240                 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2241                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2242                         mpp_addr = hdr->addr4;
2243                         proxied_addr = mesh_hdr->eaddr2;
2244                 } else {
2245                         return RX_DROP_MONITOR;
2246                 }
2247
2248                 rcu_read_lock();
2249                 mppath = mpp_path_lookup(sdata, proxied_addr);
2250                 if (!mppath) {
2251                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2252                 } else {
2253                         spin_lock_bh(&mppath->state_lock);
2254                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2255                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2256                         spin_unlock_bh(&mppath->state_lock);
2257                 }
2258                 rcu_read_unlock();
2259         }
2260
2261         /* Frame has reached destination.  Don't forward */
2262         if (!is_multicast_ether_addr(hdr->addr1) &&
2263             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2264                 return RX_CONTINUE;
2265
2266         q = ieee80211_select_queue_80211(sdata, skb, hdr);
2267         if (ieee80211_queue_stopped(&local->hw, q)) {
2268                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2269                 return RX_DROP_MONITOR;
2270         }
2271         skb_set_queue_mapping(skb, q);
2272
2273         if (!--mesh_hdr->ttl) {
2274                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2275                 goto out;
2276         }
2277
2278         if (!ifmsh->mshcfg.dot11MeshForwarding)
2279                 goto out;
2280
2281         fwd_skb = skb_copy(skb, GFP_ATOMIC);
2282         if (!fwd_skb) {
2283                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2284                                     sdata->name);
2285                 goto out;
2286         }
2287
2288         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2289         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2290         info = IEEE80211_SKB_CB(fwd_skb);
2291         memset(info, 0, sizeof(*info));
2292         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2293         info->control.vif = &rx->sdata->vif;
2294         info->control.jiffies = jiffies;
2295         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2296                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2297                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2298                 /* update power mode indication when forwarding */
2299                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2300         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2301                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2302                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2303         } else {
2304                 /* unable to resolve next hop */
2305                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2306                                    fwd_hdr->addr3, 0,
2307                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2308                                    fwd_hdr->addr2);
2309                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2310                 kfree_skb(fwd_skb);
2311                 return RX_DROP_MONITOR;
2312         }
2313
2314         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2315         ieee80211_add_pending_skb(local, fwd_skb);
2316  out:
2317         if (is_multicast_ether_addr(hdr->addr1))
2318                 return RX_CONTINUE;
2319         return RX_DROP_MONITOR;
2320 }
2321 #endif
2322
2323 static ieee80211_rx_result debug_noinline
2324 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2325 {
2326         struct ieee80211_sub_if_data *sdata = rx->sdata;
2327         struct ieee80211_local *local = rx->local;
2328         struct net_device *dev = sdata->dev;
2329         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2330         __le16 fc = hdr->frame_control;
2331         bool port_control;
2332         int err;
2333
2334         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2335                 return RX_CONTINUE;
2336
2337         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2338                 return RX_DROP_MONITOR;
2339
2340         if (rx->sta) {
2341                 /* The seqno index has the same property as needed
2342                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2343                  * for non-QoS-data frames. Here we know it's a data
2344                  * frame, so count MSDUs.
2345                  */
2346                 rx->sta->rx_msdu[rx->seqno_idx]++;
2347         }
2348
2349         /*
2350          * Send unexpected-4addr-frame event to hostapd. For older versions,
2351          * also drop the frame to cooked monitor interfaces.
2352          */
2353         if (ieee80211_has_a4(hdr->frame_control) &&
2354             sdata->vif.type == NL80211_IFTYPE_AP) {
2355                 if (rx->sta &&
2356                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2357                         cfg80211_rx_unexpected_4addr_frame(
2358                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2359                 return RX_DROP_MONITOR;
2360         }
2361
2362         err = __ieee80211_data_to_8023(rx, &port_control);
2363         if (unlikely(err))
2364                 return RX_DROP_UNUSABLE;
2365
2366         if (!ieee80211_frame_allowed(rx, fc))
2367                 return RX_DROP_MONITOR;
2368
2369         /* directly handle TDLS channel switch requests/responses */
2370         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2371                                                 cpu_to_be16(ETH_P_TDLS))) {
2372                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2373
2374                 if (pskb_may_pull(rx->skb,
2375                                   offsetof(struct ieee80211_tdls_data, u)) &&
2376                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2377                     tf->category == WLAN_CATEGORY_TDLS &&
2378                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2379                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2380                         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TDLS_CHSW;
2381                         skb_queue_tail(&sdata->skb_queue, rx->skb);
2382                         ieee80211_queue_work(&rx->local->hw, &sdata->work);
2383                         if (rx->sta)
2384                                 rx->sta->rx_packets++;
2385
2386                         return RX_QUEUED;
2387                 }
2388         }
2389
2390         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2391             unlikely(port_control) && sdata->bss) {
2392                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2393                                      u.ap);
2394                 dev = sdata->dev;
2395                 rx->sdata = sdata;
2396         }
2397
2398         rx->skb->dev = dev;
2399
2400         if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2401             !is_multicast_ether_addr(
2402                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2403             (!local->scanning &&
2404              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2405                         mod_timer(&local->dynamic_ps_timer, jiffies +
2406                          msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2407         }
2408
2409         ieee80211_deliver_skb(rx);
2410
2411         return RX_QUEUED;
2412 }
2413
2414 static ieee80211_rx_result debug_noinline
2415 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2416 {
2417         struct sk_buff *skb = rx->skb;
2418         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2419         struct tid_ampdu_rx *tid_agg_rx;
2420         u16 start_seq_num;
2421         u16 tid;
2422
2423         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2424                 return RX_CONTINUE;
2425
2426         if (ieee80211_is_back_req(bar->frame_control)) {
2427                 struct {
2428                         __le16 control, start_seq_num;
2429                 } __packed bar_data;
2430                 struct ieee80211_event event = {
2431                         .type = BAR_RX_EVENT,
2432                 };
2433
2434                 if (!rx->sta)
2435                         return RX_DROP_MONITOR;
2436
2437                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2438                                   &bar_data, sizeof(bar_data)))
2439                         return RX_DROP_MONITOR;
2440
2441                 tid = le16_to_cpu(bar_data.control) >> 12;
2442
2443                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2444                 if (!tid_agg_rx)
2445                         return RX_DROP_MONITOR;
2446
2447                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2448                 event.u.ba.tid = tid;
2449                 event.u.ba.ssn = start_seq_num;
2450                 event.u.ba.sta = &rx->sta->sta;
2451
2452                 /* reset session timer */
2453                 if (tid_agg_rx->timeout)
2454                         mod_timer(&tid_agg_rx->session_timer,
2455                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2456
2457                 spin_lock(&tid_agg_rx->reorder_lock);
2458                 /* release stored frames up to start of BAR */
2459                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2460                                                  start_seq_num, frames);
2461                 spin_unlock(&tid_agg_rx->reorder_lock);
2462
2463                 drv_event_callback(rx->local, rx->sdata, &event);
2464
2465                 kfree_skb(skb);
2466                 return RX_QUEUED;
2467         }
2468
2469         /*
2470          * After this point, we only want management frames,
2471          * so we can drop all remaining control frames to
2472          * cooked monitor interfaces.
2473          */
2474         return RX_DROP_MONITOR;
2475 }
2476
2477 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2478                                            struct ieee80211_mgmt *mgmt,
2479                                            size_t len)
2480 {
2481         struct ieee80211_local *local = sdata->local;
2482         struct sk_buff *skb;
2483         struct ieee80211_mgmt *resp;
2484
2485         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2486                 /* Not to own unicast address */
2487                 return;
2488         }
2489
2490         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2491             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2492                 /* Not from the current AP or not associated yet. */
2493                 return;
2494         }
2495
2496         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2497                 /* Too short SA Query request frame */
2498                 return;
2499         }
2500
2501         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2502         if (skb == NULL)
2503                 return;
2504
2505         skb_reserve(skb, local->hw.extra_tx_headroom);
2506         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2507         memset(resp, 0, 24);
2508         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2509         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2510         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2511         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2512                                           IEEE80211_STYPE_ACTION);
2513         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2514         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2515         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2516         memcpy(resp->u.action.u.sa_query.trans_id,
2517                mgmt->u.action.u.sa_query.trans_id,
2518                WLAN_SA_QUERY_TR_ID_LEN);
2519
2520         ieee80211_tx_skb(sdata, skb);
2521 }
2522
2523 static ieee80211_rx_result debug_noinline
2524 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2525 {
2526         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2527         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2528
2529         /*
2530          * From here on, look only at management frames.
2531          * Data and control frames are already handled,
2532          * and unknown (reserved) frames are useless.
2533          */
2534         if (rx->skb->len < 24)
2535                 return RX_DROP_MONITOR;
2536
2537         if (!ieee80211_is_mgmt(mgmt->frame_control))
2538                 return RX_DROP_MONITOR;
2539
2540         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2541             ieee80211_is_beacon(mgmt->frame_control) &&
2542             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2543                 int sig = 0;
2544
2545                 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2546                         sig = status->signal;
2547
2548                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2549                                             rx->skb->data, rx->skb->len,
2550                                             status->freq, sig);
2551                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2552         }
2553
2554         if (ieee80211_drop_unencrypted_mgmt(rx))
2555                 return RX_DROP_UNUSABLE;
2556
2557         return RX_CONTINUE;
2558 }
2559
2560 static ieee80211_rx_result debug_noinline
2561 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2562 {
2563         struct ieee80211_local *local = rx->local;
2564         struct ieee80211_sub_if_data *sdata = rx->sdata;
2565         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2566         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2567         int len = rx->skb->len;
2568
2569         if (!ieee80211_is_action(mgmt->frame_control))
2570                 return RX_CONTINUE;
2571
2572         /* drop too small frames */
2573         if (len < IEEE80211_MIN_ACTION_SIZE)
2574                 return RX_DROP_UNUSABLE;
2575
2576         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2577             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2578             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2579                 return RX_DROP_UNUSABLE;
2580
2581         switch (mgmt->u.action.category) {
2582         case WLAN_CATEGORY_HT:
2583                 /* reject HT action frames from stations not supporting HT */
2584                 if (!rx->sta->sta.ht_cap.ht_supported)
2585                         goto invalid;
2586
2587                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2588                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2589                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2590                     sdata->vif.type != NL80211_IFTYPE_AP &&
2591                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2592                         break;
2593
2594                 /* verify action & smps_control/chanwidth are present */
2595                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2596                         goto invalid;
2597
2598                 switch (mgmt->u.action.u.ht_smps.action) {
2599                 case WLAN_HT_ACTION_SMPS: {
2600                         struct ieee80211_supported_band *sband;
2601                         enum ieee80211_smps_mode smps_mode;
2602
2603                         /* convert to HT capability */
2604                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2605                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2606                                 smps_mode = IEEE80211_SMPS_OFF;
2607                                 break;
2608                         case WLAN_HT_SMPS_CONTROL_STATIC:
2609                                 smps_mode = IEEE80211_SMPS_STATIC;
2610                                 break;
2611                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2612                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2613                                 break;
2614                         default:
2615                                 goto invalid;
2616                         }
2617
2618                         /* if no change do nothing */
2619                         if (rx->sta->sta.smps_mode == smps_mode)
2620                                 goto handled;
2621                         rx->sta->sta.smps_mode = smps_mode;
2622
2623                         sband = rx->local->hw.wiphy->bands[status->band];
2624
2625                         rate_control_rate_update(local, sband, rx->sta,
2626                                                  IEEE80211_RC_SMPS_CHANGED);
2627                         goto handled;
2628                 }
2629                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2630                         struct ieee80211_supported_band *sband;
2631                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2632                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
2633
2634                         /* If it doesn't support 40 MHz it can't change ... */
2635                         if (!(rx->sta->sta.ht_cap.cap &
2636                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2637                                 goto handled;
2638
2639                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2640                                 max_bw = IEEE80211_STA_RX_BW_20;
2641                         else
2642                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2643
2644                         /* set cur_max_bandwidth and recalc sta bw */
2645                         rx->sta->cur_max_bandwidth = max_bw;
2646                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2647
2648                         if (rx->sta->sta.bandwidth == new_bw)
2649                                 goto handled;
2650
2651                         rx->sta->sta.bandwidth = new_bw;
2652                         sband = rx->local->hw.wiphy->bands[status->band];
2653
2654                         rate_control_rate_update(local, sband, rx->sta,
2655                                                  IEEE80211_RC_BW_CHANGED);
2656                         goto handled;
2657                 }
2658                 default:
2659                         goto invalid;
2660                 }
2661
2662                 break;
2663         case WLAN_CATEGORY_PUBLIC:
2664                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2665                         goto invalid;
2666                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2667                         break;
2668                 if (!rx->sta)
2669                         break;
2670                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2671                         break;
2672                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2673                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2674                         break;
2675                 if (len < offsetof(struct ieee80211_mgmt,
2676                                    u.action.u.ext_chan_switch.variable))
2677                         goto invalid;
2678                 goto queue;
2679         case WLAN_CATEGORY_VHT:
2680                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2681                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2682                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2683                     sdata->vif.type != NL80211_IFTYPE_AP &&
2684                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2685                         break;
2686
2687                 /* verify action code is present */
2688                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2689                         goto invalid;
2690
2691                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2692                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2693                         u8 opmode;
2694
2695                         /* verify opmode is present */
2696                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2697                                 goto invalid;
2698
2699                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2700
2701                         ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2702                                                     opmode, status->band,
2703                                                     false);
2704                         goto handled;
2705                 }
2706                 default:
2707                         break;
2708                 }
2709                 break;
2710         case WLAN_CATEGORY_BACK:
2711                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2712                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2713                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2714                     sdata->vif.type != NL80211_IFTYPE_AP &&
2715                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2716                         break;
2717
2718                 /* verify action_code is present */
2719                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2720                         break;
2721
2722                 switch (mgmt->u.action.u.addba_req.action_code) {
2723                 case WLAN_ACTION_ADDBA_REQ:
2724                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2725                                    sizeof(mgmt->u.action.u.addba_req)))
2726                                 goto invalid;
2727                         break;
2728                 case WLAN_ACTION_ADDBA_RESP:
2729                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2730                                    sizeof(mgmt->u.action.u.addba_resp)))
2731                                 goto invalid;
2732                         break;
2733                 case WLAN_ACTION_DELBA:
2734                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2735                                    sizeof(mgmt->u.action.u.delba)))
2736                                 goto invalid;
2737                         break;
2738                 default:
2739                         goto invalid;
2740                 }
2741
2742                 goto queue;
2743         case WLAN_CATEGORY_SPECTRUM_MGMT:
2744                 /* verify action_code is present */
2745                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2746                         break;
2747
2748                 switch (mgmt->u.action.u.measurement.action_code) {
2749                 case WLAN_ACTION_SPCT_MSR_REQ:
2750                         if (status->band != IEEE80211_BAND_5GHZ)
2751                                 break;
2752
2753                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2754                                    sizeof(mgmt->u.action.u.measurement)))
2755                                 break;
2756
2757                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2758                                 break;
2759
2760                         ieee80211_process_measurement_req(sdata, mgmt, len);
2761                         goto handled;
2762                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2763                         u8 *bssid;
2764                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2765                                    sizeof(mgmt->u.action.u.chan_switch)))
2766                                 break;
2767
2768                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2769                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2770                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2771                                 break;
2772
2773                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2774                                 bssid = sdata->u.mgd.bssid;
2775                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2776                                 bssid = sdata->u.ibss.bssid;
2777                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2778                                 bssid = mgmt->sa;
2779                         else
2780                                 break;
2781
2782                         if (!ether_addr_equal(mgmt->bssid, bssid))
2783                                 break;
2784
2785                         goto queue;
2786                         }
2787                 }
2788                 break;
2789         case WLAN_CATEGORY_SA_QUERY:
2790                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2791                            sizeof(mgmt->u.action.u.sa_query)))
2792                         break;
2793
2794                 switch (mgmt->u.action.u.sa_query.action) {
2795                 case WLAN_ACTION_SA_QUERY_REQUEST:
2796                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2797                                 break;
2798                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2799                         goto handled;
2800                 }
2801                 break;
2802         case WLAN_CATEGORY_SELF_PROTECTED:
2803                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2804                            sizeof(mgmt->u.action.u.self_prot.action_code)))
2805                         break;
2806
2807                 switch (mgmt->u.action.u.self_prot.action_code) {
2808                 case WLAN_SP_MESH_PEERING_OPEN:
2809                 case WLAN_SP_MESH_PEERING_CLOSE:
2810                 case WLAN_SP_MESH_PEERING_CONFIRM:
2811                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2812                                 goto invalid;
2813                         if (sdata->u.mesh.user_mpm)
2814                                 /* userspace handles this frame */
2815                                 break;
2816                         goto queue;
2817                 case WLAN_SP_MGK_INFORM:
2818                 case WLAN_SP_MGK_ACK:
2819                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2820                                 goto invalid;
2821                         break;
2822                 }
2823                 break;
2824         case WLAN_CATEGORY_MESH_ACTION:
2825                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2826                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
2827                         break;
2828
2829                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2830                         break;
2831                 if (mesh_action_is_path_sel(mgmt) &&
2832                     !mesh_path_sel_is_hwmp(sdata))
2833                         break;
2834                 goto queue;
2835         }
2836
2837         return RX_CONTINUE;
2838
2839  invalid:
2840         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2841         /* will return in the next handlers */
2842         return RX_CONTINUE;
2843
2844  handled:
2845         if (rx->sta)
2846                 rx->sta->rx_packets++;
2847         dev_kfree_skb(rx->skb);
2848         return RX_QUEUED;
2849
2850  queue:
2851         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2852         skb_queue_tail(&sdata->skb_queue, rx->skb);
2853         ieee80211_queue_work(&local->hw, &sdata->work);
2854         if (rx->sta)
2855                 rx->sta->rx_packets++;
2856         return RX_QUEUED;
2857 }
2858
2859 static ieee80211_rx_result debug_noinline
2860 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2861 {
2862         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2863         int sig = 0;
2864
2865         /* skip known-bad action frames and return them in the next handler */
2866         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2867                 return RX_CONTINUE;
2868
2869         /*
2870          * Getting here means the kernel doesn't know how to handle
2871          * it, but maybe userspace does ... include returned frames
2872          * so userspace can register for those to know whether ones
2873          * it transmitted were processed or returned.
2874          */
2875
2876         if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2877                 sig = status->signal;
2878
2879         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2880                              rx->skb->data, rx->skb->len, 0)) {
2881                 if (rx->sta)
2882                         rx->sta->rx_packets++;
2883                 dev_kfree_skb(rx->skb);
2884                 return RX_QUEUED;
2885         }
2886
2887         return RX_CONTINUE;
2888 }
2889
2890 static ieee80211_rx_result debug_noinline
2891 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2892 {
2893         struct ieee80211_local *local = rx->local;
2894         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2895         struct sk_buff *nskb;
2896         struct ieee80211_sub_if_data *sdata = rx->sdata;
2897         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2898
2899         if (!ieee80211_is_action(mgmt->frame_control))
2900                 return RX_CONTINUE;
2901
2902         /*
2903          * For AP mode, hostapd is responsible for handling any action
2904          * frames that we didn't handle, including returning unknown
2905          * ones. For all other modes we will return them to the sender,
2906          * setting the 0x80 bit in the action category, as required by
2907          * 802.11-2012 9.24.4.
2908          * Newer versions of hostapd shall also use the management frame
2909          * registration mechanisms, but older ones still use cooked
2910          * monitor interfaces so push all frames there.
2911          */
2912         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2913             (sdata->vif.type == NL80211_IFTYPE_AP ||
2914              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2915                 return RX_DROP_MONITOR;
2916
2917         if (is_multicast_ether_addr(mgmt->da))
2918                 return RX_DROP_MONITOR;
2919
2920         /* do not return rejected action frames */
2921         if (mgmt->u.action.category & 0x80)
2922                 return RX_DROP_UNUSABLE;
2923
2924         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2925                                GFP_ATOMIC);
2926         if (nskb) {
2927                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2928
2929                 nmgmt->u.action.category |= 0x80;
2930                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2931                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2932
2933                 memset(nskb->cb, 0, sizeof(nskb->cb));
2934
2935                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2936                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2937
2938                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2939                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2940                                       IEEE80211_TX_CTL_NO_CCK_RATE;
2941                         if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2942                                 info->hw_queue =
2943                                         local->hw.offchannel_tx_hw_queue;
2944                 }
2945
2946                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2947                                             status->band);
2948         }
2949         dev_kfree_skb(rx->skb);
2950         return RX_QUEUED;
2951 }
2952
2953 static ieee80211_rx_result debug_noinline
2954 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2955 {
2956         struct ieee80211_sub_if_data *sdata = rx->sdata;
2957         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2958         __le16 stype;
2959
2960         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2961
2962         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2963             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2964             sdata->vif.type != NL80211_IFTYPE_OCB &&
2965             sdata->vif.type != NL80211_IFTYPE_STATION)
2966                 return RX_DROP_MONITOR;
2967
2968         switch (stype) {
2969         case cpu_to_le16(IEEE80211_STYPE_AUTH):
2970         case cpu_to_le16(IEEE80211_STYPE_BEACON):
2971         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2972                 /* process for all: mesh, mlme, ibss */
2973                 break;
2974         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2975         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2976         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2977         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2978                 if (is_multicast_ether_addr(mgmt->da) &&
2979                     !is_broadcast_ether_addr(mgmt->da))
2980                         return RX_DROP_MONITOR;
2981
2982                 /* process only for station */
2983                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2984                         return RX_DROP_MONITOR;
2985                 break;
2986         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2987                 /* process only for ibss and mesh */
2988                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2989                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2990                         return RX_DROP_MONITOR;
2991                 break;
2992         default:
2993                 return RX_DROP_MONITOR;
2994         }
2995
2996         /* queue up frame and kick off work to process it */
2997         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2998         skb_queue_tail(&sdata->skb_queue, rx->skb);
2999         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3000         if (rx->sta)
3001                 rx->sta->rx_packets++;
3002
3003         return RX_QUEUED;
3004 }
3005
3006 /* TODO: use IEEE80211_RX_FRAGMENTED */
3007 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3008                                         struct ieee80211_rate *rate)
3009 {
3010         struct ieee80211_sub_if_data *sdata;
3011         struct ieee80211_local *local = rx->local;
3012         struct sk_buff *skb = rx->skb, *skb2;
3013         struct net_device *prev_dev = NULL;
3014         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3015         int needed_headroom;
3016
3017         /*
3018          * If cooked monitor has been processed already, then
3019          * don't do it again. If not, set the flag.
3020          */
3021         if (rx->flags & IEEE80211_RX_CMNTR)
3022                 goto out_free_skb;
3023         rx->flags |= IEEE80211_RX_CMNTR;
3024
3025         /* If there are no cooked monitor interfaces, just free the SKB */
3026         if (!local->cooked_mntrs)
3027                 goto out_free_skb;
3028
3029         /* vendor data is long removed here */
3030         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3031         /* room for the radiotap header based on driver features */
3032         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3033
3034         if (skb_headroom(skb) < needed_headroom &&
3035             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3036                 goto out_free_skb;
3037
3038         /* prepend radiotap information */
3039         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3040                                          false);
3041
3042         skb_set_mac_header(skb, 0);
3043         skb->ip_summed = CHECKSUM_UNNECESSARY;
3044         skb->pkt_type = PACKET_OTHERHOST;
3045         skb->protocol = htons(ETH_P_802_2);
3046
3047         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3048                 if (!ieee80211_sdata_running(sdata))
3049                         continue;
3050
3051                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3052                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
3053                         continue;
3054
3055                 if (prev_dev) {
3056                         skb2 = skb_clone(skb, GFP_ATOMIC);
3057                         if (skb2) {
3058                                 skb2->dev = prev_dev;
3059                                 netif_receive_skb(skb2);
3060                         }
3061                 }
3062
3063                 prev_dev = sdata->dev;
3064                 ieee80211_rx_stats(sdata->dev, skb->len);
3065         }
3066
3067         if (prev_dev) {
3068                 skb->dev = prev_dev;
3069                 netif_receive_skb(skb);
3070                 return;
3071         }
3072
3073  out_free_skb:
3074         dev_kfree_skb(skb);
3075 }
3076
3077 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3078                                          ieee80211_rx_result res)
3079 {
3080         switch (res) {
3081         case RX_DROP_MONITOR:
3082                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3083                 if (rx->sta)
3084                         rx->sta->rx_dropped++;
3085                 /* fall through */
3086         case RX_CONTINUE: {
3087                 struct ieee80211_rate *rate = NULL;
3088                 struct ieee80211_supported_band *sband;
3089                 struct ieee80211_rx_status *status;
3090
3091                 status = IEEE80211_SKB_RXCB((rx->skb));
3092
3093                 sband = rx->local->hw.wiphy->bands[status->band];
3094                 if (!(status->flag & RX_FLAG_HT) &&
3095                     !(status->flag & RX_FLAG_VHT))
3096                         rate = &sband->bitrates[status->rate_idx];
3097
3098                 ieee80211_rx_cooked_monitor(rx, rate);
3099                 break;
3100                 }
3101         case RX_DROP_UNUSABLE:
3102                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3103                 if (rx->sta)
3104                         rx->sta->rx_dropped++;
3105                 dev_kfree_skb(rx->skb);
3106                 break;
3107         case RX_QUEUED:
3108                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3109                 break;
3110         }
3111 }
3112
3113 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3114                                   struct sk_buff_head *frames)
3115 {
3116         ieee80211_rx_result res = RX_DROP_MONITOR;
3117         struct sk_buff *skb;
3118
3119 #define CALL_RXH(rxh)                   \
3120         do {                            \
3121                 res = rxh(rx);          \
3122                 if (res != RX_CONTINUE) \
3123                         goto rxh_next;  \
3124         } while (0);
3125
3126         /* Lock here to avoid hitting all of the data used in the RX
3127          * path (e.g. key data, station data, ...) concurrently when
3128          * a frame is released from the reorder buffer due to timeout
3129          * from the timer, potentially concurrently with RX from the
3130          * driver.
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         if (!skb_queue_empty(&frames)) {
3233                 struct ieee80211_event event = {
3234                         .type = BA_FRAME_TIMEOUT,
3235                         .u.ba.tid = tid,
3236                         .u.ba.sta = &sta->sta,
3237                 };
3238                 drv_event_callback(rx.local, rx.sdata, &event);
3239         }
3240
3241         ieee80211_rx_handlers(&rx, &frames);
3242 }
3243
3244 /* main receive path */
3245
3246 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3247 {
3248         struct ieee80211_sub_if_data *sdata = rx->sdata;
3249         struct sk_buff *skb = rx->skb;
3250         struct ieee80211_hdr *hdr = (void *)skb->data;
3251         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3252         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3253         int multicast = is_multicast_ether_addr(hdr->addr1);
3254
3255         switch (sdata->vif.type) {
3256         case NL80211_IFTYPE_STATION:
3257                 if (!bssid && !sdata->u.mgd.use_4addr)
3258                         return false;
3259                 if (multicast)
3260                         return true;
3261                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3262         case NL80211_IFTYPE_ADHOC:
3263                 if (!bssid)
3264                         return false;
3265                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3266                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3267                         return false;
3268                 if (ieee80211_is_beacon(hdr->frame_control))
3269                         return true;
3270                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3271                         return false;
3272                 if (!multicast &&
3273                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3274                         return false;
3275                 if (!rx->sta) {
3276                         int rate_idx;
3277                         if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3278                                 rate_idx = 0; /* TODO: HT/VHT rates */
3279                         else
3280                                 rate_idx = status->rate_idx;
3281                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3282                                                  BIT(rate_idx));
3283                 }
3284                 return true;
3285         case NL80211_IFTYPE_OCB:
3286                 if (!bssid)
3287                         return false;
3288                 if (ieee80211_is_beacon(hdr->frame_control))
3289                         return false;
3290                 if (!is_broadcast_ether_addr(bssid))
3291                         return false;
3292                 if (!multicast &&
3293                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3294                         return false;
3295                 if (!rx->sta) {
3296                         int rate_idx;
3297                         if (status->flag & RX_FLAG_HT)
3298                                 rate_idx = 0; /* TODO: HT rates */
3299                         else
3300                                 rate_idx = status->rate_idx;
3301                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3302                                                 BIT(rate_idx));
3303                 }
3304                 return true;
3305         case NL80211_IFTYPE_MESH_POINT:
3306                 if (multicast)
3307                         return true;
3308                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3309         case NL80211_IFTYPE_AP_VLAN:
3310         case NL80211_IFTYPE_AP:
3311                 if (!bssid)
3312                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3313
3314                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3315                         /*
3316                          * Accept public action frames even when the
3317                          * BSSID doesn't match, this is used for P2P
3318                          * and location updates. Note that mac80211
3319                          * itself never looks at these frames.
3320                          */
3321                         if (!multicast &&
3322                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3323                                 return false;
3324                         if (ieee80211_is_public_action(hdr, skb->len))
3325                                 return true;
3326                         return ieee80211_is_beacon(hdr->frame_control);
3327                 }
3328
3329                 if (!ieee80211_has_tods(hdr->frame_control)) {
3330                         /* ignore data frames to TDLS-peers */
3331                         if (ieee80211_is_data(hdr->frame_control))
3332                                 return false;
3333                         /* ignore action frames to TDLS-peers */
3334                         if (ieee80211_is_action(hdr->frame_control) &&
3335                             !ether_addr_equal(bssid, hdr->addr1))
3336                                 return false;
3337                 }
3338                 return true;
3339         case NL80211_IFTYPE_WDS:
3340                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3341                         return false;
3342                 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3343         case NL80211_IFTYPE_P2P_DEVICE:
3344                 return ieee80211_is_public_action(hdr, skb->len) ||
3345                        ieee80211_is_probe_req(hdr->frame_control) ||
3346                        ieee80211_is_probe_resp(hdr->frame_control) ||
3347                        ieee80211_is_beacon(hdr->frame_control);
3348         default:
3349                 break;
3350         }
3351
3352         WARN_ON_ONCE(1);
3353         return false;
3354 }
3355
3356 /*
3357  * This function returns whether or not the SKB
3358  * was destined for RX processing or not, which,
3359  * if consume is true, is equivalent to whether
3360  * or not the skb was consumed.
3361  */
3362 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3363                                             struct sk_buff *skb, bool consume)
3364 {
3365         struct ieee80211_local *local = rx->local;
3366         struct ieee80211_sub_if_data *sdata = rx->sdata;
3367
3368         rx->skb = skb;
3369
3370         if (!ieee80211_accept_frame(rx))
3371                 return false;
3372
3373         if (!consume) {
3374                 skb = skb_copy(skb, GFP_ATOMIC);
3375                 if (!skb) {
3376                         if (net_ratelimit())
3377                                 wiphy_debug(local->hw.wiphy,
3378                                         "failed to copy skb for %s\n",
3379                                         sdata->name);
3380                         return true;
3381                 }
3382
3383                 rx->skb = skb;
3384         }
3385
3386         ieee80211_invoke_rx_handlers(rx);
3387         return true;
3388 }
3389
3390 /*
3391  * This is the actual Rx frames handler. as it belongs to Rx path it must
3392  * be called with rcu_read_lock protection.
3393  */
3394 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3395                                          struct sk_buff *skb)
3396 {
3397         struct ieee80211_local *local = hw_to_local(hw);
3398         struct ieee80211_sub_if_data *sdata;
3399         struct ieee80211_hdr *hdr;
3400         __le16 fc;
3401         struct ieee80211_rx_data rx;
3402         struct ieee80211_sub_if_data *prev;
3403         struct sta_info *sta, *prev_sta;
3404         struct rhash_head *tmp;
3405         int err = 0;
3406
3407         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3408         memset(&rx, 0, sizeof(rx));
3409         rx.skb = skb;
3410         rx.local = local;
3411
3412         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3413                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
3414
3415         if (ieee80211_is_mgmt(fc)) {
3416                 /* drop frame if too short for header */
3417                 if (skb->len < ieee80211_hdrlen(fc))
3418                         err = -ENOBUFS;
3419                 else
3420                         err = skb_linearize(skb);
3421         } else {
3422                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3423         }
3424
3425         if (err) {
3426                 dev_kfree_skb(skb);
3427                 return;
3428         }
3429
3430         hdr = (struct ieee80211_hdr *)skb->data;
3431         ieee80211_parse_qos(&rx);
3432         ieee80211_verify_alignment(&rx);
3433
3434         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3435                      ieee80211_is_beacon(hdr->frame_control)))
3436                 ieee80211_scan_rx(local, skb);
3437
3438         if (ieee80211_is_data(fc)) {
3439                 const struct bucket_table *tbl;
3440
3441                 prev_sta = NULL;
3442
3443                 tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
3444
3445                 for_each_sta_info(local, tbl, hdr->addr2, sta, tmp) {
3446                         if (!prev_sta) {
3447                                 prev_sta = sta;
3448                                 continue;
3449                         }
3450
3451                         rx.sta = prev_sta;
3452                         rx.sdata = prev_sta->sdata;
3453                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
3454
3455                         prev_sta = sta;
3456                 }
3457
3458                 if (prev_sta) {
3459                         rx.sta = prev_sta;
3460                         rx.sdata = prev_sta->sdata;
3461
3462                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3463                                 return;
3464                         goto out;
3465                 }
3466         }
3467
3468         prev = NULL;
3469
3470         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3471                 if (!ieee80211_sdata_running(sdata))
3472                         continue;
3473
3474                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3475                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3476                         continue;
3477
3478                 /*
3479                  * frame is destined for this interface, but if it's
3480                  * not also for the previous one we handle that after
3481                  * the loop to avoid copying the SKB once too much
3482                  */
3483
3484                 if (!prev) {
3485                         prev = sdata;
3486                         continue;
3487                 }
3488
3489                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3490                 rx.sdata = prev;
3491                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3492
3493                 prev = sdata;
3494         }
3495
3496         if (prev) {
3497                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3498                 rx.sdata = prev;
3499
3500                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3501                         return;
3502         }
3503
3504  out:
3505         dev_kfree_skb(skb);
3506 }
3507
3508 /*
3509  * This is the receive path handler. It is called by a low level driver when an
3510  * 802.11 MPDU is received from the hardware.
3511  */
3512 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3513 {
3514         struct ieee80211_local *local = hw_to_local(hw);
3515         struct ieee80211_rate *rate = NULL;
3516         struct ieee80211_supported_band *sband;
3517         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3518
3519         WARN_ON_ONCE(softirq_count() == 0);
3520
3521         if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3522                 goto drop;
3523
3524         sband = local->hw.wiphy->bands[status->band];
3525         if (WARN_ON(!sband))
3526                 goto drop;
3527
3528         /*
3529          * If we're suspending, it is possible although not too likely
3530          * that we'd be receiving frames after having already partially
3531          * quiesced the stack. We can't process such frames then since
3532          * that might, for example, cause stations to be added or other
3533          * driver callbacks be invoked.
3534          */
3535         if (unlikely(local->quiescing || local->suspended))
3536                 goto drop;
3537
3538         /* We might be during a HW reconfig, prevent Rx for the same reason */
3539         if (unlikely(local->in_reconfig))
3540                 goto drop;
3541
3542         /*
3543          * The same happens when we're not even started,
3544          * but that's worth a warning.
3545          */
3546         if (WARN_ON(!local->started))
3547                 goto drop;
3548
3549         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3550                 /*
3551                  * Validate the rate, unless a PLCP error means that
3552                  * we probably can't have a valid rate here anyway.
3553                  */
3554
3555                 if (status->flag & RX_FLAG_HT) {
3556                         /*
3557                          * rate_idx is MCS index, which can be [0-76]
3558                          * as documented on:
3559                          *
3560                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3561                          *
3562                          * Anything else would be some sort of driver or
3563                          * hardware error. The driver should catch hardware
3564                          * errors.
3565                          */
3566                         if (WARN(status->rate_idx > 76,
3567                                  "Rate marked as an HT rate but passed "
3568                                  "status->rate_idx is not "
3569                                  "an MCS index [0-76]: %d (0x%02x)\n",
3570                                  status->rate_idx,
3571                                  status->rate_idx))
3572                                 goto drop;
3573                 } else if (status->flag & RX_FLAG_VHT) {
3574                         if (WARN_ONCE(status->rate_idx > 9 ||
3575                                       !status->vht_nss ||
3576                                       status->vht_nss > 8,
3577                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3578                                       status->rate_idx, status->vht_nss))
3579                                 goto drop;
3580                 } else {
3581                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3582                                 goto drop;
3583                         rate = &sband->bitrates[status->rate_idx];
3584                 }
3585         }
3586
3587         status->rx_flags = 0;
3588
3589         /*
3590          * key references and virtual interfaces are protected using RCU
3591          * and this requires that we are in a read-side RCU section during
3592          * receive processing
3593          */
3594         rcu_read_lock();
3595
3596         /*
3597          * Frames with failed FCS/PLCP checksum are not returned,
3598          * all other frames are returned without radiotap header
3599          * if it was previously present.
3600          * Also, frames with less than 16 bytes are dropped.
3601          */
3602         skb = ieee80211_rx_monitor(local, skb, rate);
3603         if (!skb) {
3604                 rcu_read_unlock();
3605                 return;
3606         }
3607
3608         ieee80211_tpt_led_trig_rx(local,
3609                         ((struct ieee80211_hdr *)skb->data)->frame_control,
3610                         skb->len);
3611         __ieee80211_rx_handle_packet(hw, skb);
3612
3613         rcu_read_unlock();
3614
3615         return;
3616  drop:
3617         kfree_skb(skb);
3618 }
3619 EXPORT_SYMBOL(ieee80211_rx);
3620
3621 /* This is a version of the rx handler that can be called from hard irq
3622  * context. Post the skb on the queue and schedule the tasklet */
3623 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3624 {
3625         struct ieee80211_local *local = hw_to_local(hw);
3626
3627         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3628
3629         skb->pkt_type = IEEE80211_RX_MSG;
3630         skb_queue_tail(&local->skb_queue, skb);
3631         tasklet_schedule(&local->tasklet);
3632 }
3633 EXPORT_SYMBOL(ieee80211_rx_irqsafe);