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  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/jiffies.h>
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/skbuff.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/etherdevice.h>
  18 #include <linux/rcupdate.h>
  19 #include <linux/export.h>
  20 #include <net/mac80211.h>
  21 #include <net/ieee80211_radiotap.h>
  22 #include <asm/unaligned.h>
  23
  24 #include "ieee80211_i.h"
  25 #include "driver-ops.h"
  26 #include "led.h"
  27 #include "mesh.h"
  28 #include "wep.h"
  29 #include "wpa.h"
  30 #include "tkip.h"
  31 #include "wme.h"
  32 #include "rate.h"
  33
  34 /*
  35  * monitor mode reception
  36  *
  37  * This function cleans up the SKB, i.e. it removes all the stuff
  38  * only useful for monitoring.
  39  */
  40 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
  41                                            struct sk_buff *skb)
  42 {
  43         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
  44
  45         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
  46                 if (likely(skb->len > FCS_LEN))
  47                         __pskb_trim(skb, skb->len - FCS_LEN);
  48                 else {
  49                         /* driver bug */
  50                         WARN_ON(1);
  51                         dev_kfree_skb(skb);
  52                         return NULL;
  53                 }
  54         }
  55
  56         if (status->vendor_radiotap_len)
  57                 __pskb_pull(skb, status->vendor_radiotap_len);
  58
  59         return skb;
  60 }
  61
  62 static inline int should_drop_frame(struct sk_buff *skb, int present_fcs_len)
  63 {
  64         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
  65         struct ieee80211_hdr *hdr;
  66
  67         hdr = (void *)(skb->data + status->vendor_radiotap_len);
  68
  69         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
  70                             RX_FLAG_FAILED_PLCP_CRC |
  71                             RX_FLAG_AMPDU_IS_ZEROLEN))
  72                 return 1;
  73         if (unlikely(skb->len < 16 + present_fcs_len +
  74                                 status->vendor_radiotap_len))
  75                 return 1;
  76         if (ieee80211_is_ctl(hdr->frame_control) &&
  77             !ieee80211_is_pspoll(hdr->frame_control) &&
  78             !ieee80211_is_back_req(hdr->frame_control))
  79                 return 1;
  80         return 0;
  81 }
  82
  83 static int
  84 ieee80211_rx_radiotap_space(struct ieee80211_local *local,
  85                             struct ieee80211_rx_status *status)
  86 {
  87         int len;
  88
  89         /* always present fields */
  90         len = sizeof(struct ieee80211_radiotap_header) + 8;
  91
  92         /* allocate extra bitmaps */
  93         if (status->vendor_radiotap_len)
  94                 len += 4;
  95         if (status->chains)
  96                 len += 4 * hweight8(status->chains);
  97
  98         if (ieee80211_have_rx_timestamp(status)) {
  99                 len = ALIGN(len, 8);
 100                 len += 8;
 101         }
 102         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 103                 len += 1;
 104
 105         /* antenna field, if we don't have per-chain info */
 106         if (!status->chains)
 107                 len += 1;
 108
 109         /* padding for RX_FLAGS if necessary */
 110         len = ALIGN(len, 2);
 111
 112         if (status->flag & RX_FLAG_HT) /* HT info */
 113                 len += 3;
 114
 115         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 116                 len = ALIGN(len, 4);
 117                 len += 8;
 118         }
 119
 120         if (status->flag & RX_FLAG_VHT) {
 121                 len = ALIGN(len, 2);
 122                 len += 12;
 123         }
 124
 125         if (status->chains) {
 126                 /* antenna and antenna signal fields */
 127                 len += 2 * hweight8(status->chains);
 128         }
 129
 130         if (status->vendor_radiotap_len) {
 131                 if (WARN_ON_ONCE(status->vendor_radiotap_align == 0))
 132                         status->vendor_radiotap_align = 1;
 133                 /* align standard part of vendor namespace */
 134                 len = ALIGN(len, 2);
 135                 /* allocate standard part of vendor namespace */
 136                 len += 6;
 137                 /* align vendor-defined part */
 138                 len = ALIGN(len, status->vendor_radiotap_align);
 139                 /* vendor-defined part is already in skb */
 140         }
 141
 142         return len;
 143 }
 144
 145 /*
 146  * ieee80211_add_rx_radiotap_header - add radiotap header
 147  *
 148  * add a radiotap header containing all the fields which the hardware provided.
 149  */
 150 static void
 151 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 152                                  struct sk_buff *skb,
 153                                  struct ieee80211_rate *rate,
 154                                  int rtap_len, bool has_fcs)
 155 {
 156         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 157         struct ieee80211_radiotap_header *rthdr;
 158         unsigned char *pos;
 159         __le32 *it_present;
 160         u32 it_present_val;
 161         u16 rx_flags = 0;
 162         u16 channel_flags = 0;
 163         int mpdulen, chain;
 164         unsigned long chains = status->chains;
 165
 166         mpdulen = skb->len;
 167         if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
 168                 mpdulen += FCS_LEN;
 169
 170         rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
 171         memset(rthdr, 0, rtap_len);
 172         it_present = &rthdr->it_present;
 173
 174         /* radiotap header, set always present flags */
 175         rthdr->it_len = cpu_to_le16(rtap_len + status->vendor_radiotap_len);
 176         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
 177                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
 178                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
 179
 180         if (!status->chains)
 181                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
 182
 183         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 184                 it_present_val |=
 185                         BIT(IEEE80211_RADIOTAP_EXT) |
 186                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
 187                 put_unaligned_le32(it_present_val, it_present);
 188                 it_present++;
 189                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
 190                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 191         }
 192
 193         if (status->vendor_radiotap_len) {
 194                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
 195                                   BIT(IEEE80211_RADIOTAP_EXT);
 196                 put_unaligned_le32(it_present_val, it_present);
 197                 it_present++;
 198                 it_present_val = status->vendor_radiotap_bitmap;
 199         }
 200
 201         put_unaligned_le32(it_present_val, it_present);
 202
 203         pos = (void *)(it_present + 1);
 204
 205         /* the order of the following fields is important */
 206
 207         /* IEEE80211_RADIOTAP_TSFT */
 208         if (ieee80211_have_rx_timestamp(status)) {
 209                 /* padding */
 210                 while ((pos - (u8 *)rthdr) & 7)
 211                         *pos++ = 0;
 212                 put_unaligned_le64(
 213                         ieee80211_calculate_rx_timestamp(local, status,
 214                                                          mpdulen, 0),
 215                         pos);
 216                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 217                 pos += 8;
 218         }
 219
 220         /* IEEE80211_RADIOTAP_FLAGS */
 221         if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
 222                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 223         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 224                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 225         if (status->flag & RX_FLAG_SHORTPRE)
 226                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 227         pos++;
 228
 229         /* IEEE80211_RADIOTAP_RATE */
 230         if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
 231                 /*
 232                  * Without rate information don't add it. If we have,
 233                  * MCS information is a separate field in radiotap,
 234                  * added below. The byte here is needed as padding
 235                  * for the channel though, so initialise it to 0.
 236                  */
 237                 *pos = 0;
 238         } else {
 239                 int shift = 0;
 240                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 241                 if (status->flag & RX_FLAG_10MHZ)
 242                         shift = 1;
 243                 else if (status->flag & RX_FLAG_5MHZ)
 244                         shift = 2;
 245                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
 246         }
 247         pos++;
 248
 249         /* IEEE80211_RADIOTAP_CHANNEL */
 250         put_unaligned_le16(status->freq, pos);
 251         pos += 2;
 252         if (status->flag & RX_FLAG_10MHZ)
 253                 channel_flags |= IEEE80211_CHAN_HALF;
 254         else if (status->flag & RX_FLAG_5MHZ)
 255                 channel_flags |= IEEE80211_CHAN_QUARTER;
 256
 257         if (status->band == IEEE80211_BAND_5GHZ)
 258                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 259         else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
 260                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 261         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 262                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 263         else if (rate)
 264                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 265         else
 266                 channel_flags |= IEEE80211_CHAN_2GHZ;
 267         put_unaligned_le16(channel_flags, pos);
 268         pos += 2;
 269
 270         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 271         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
 272             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 273                 *pos = status->signal;
 274                 rthdr->it_present |=
 275                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 276                 pos++;
 277         }
 278
 279         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 280
 281         if (!status->chains) {
 282                 /* IEEE80211_RADIOTAP_ANTENNA */
 283                 *pos = status->antenna;
 284                 pos++;
 285         }
 286
 287         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 288
 289         /* IEEE80211_RADIOTAP_RX_FLAGS */
 290         /* ensure 2 byte alignment for the 2 byte field as required */
 291         if ((pos - (u8 *)rthdr) & 1)
 292                 *pos++ = 0;
 293         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 294                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 295         put_unaligned_le16(rx_flags, pos);
 296         pos += 2;
 297
 298         if (status->flag & RX_FLAG_HT) {
 299                 unsigned int stbc;
 300
 301                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 302                 *pos++ = local->hw.radiotap_mcs_details;
 303                 *pos = 0;
 304                 if (status->flag & RX_FLAG_SHORT_GI)
 305                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 306                 if (status->flag & RX_FLAG_40MHZ)
 307                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 308                 if (status->flag & RX_FLAG_HT_GF)
 309                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 310                 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
 311                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 312                 pos++;
 313                 *pos++ = status->rate_idx;
 314         }
 315
 316         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 317                 u16 flags = 0;
 318
 319                 /* ensure 4 byte alignment */
 320                 while ((pos - (u8 *)rthdr) & 3)
 321                         pos++;
 322                 rthdr->it_present |=
 323                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 324                 put_unaligned_le32(status->ampdu_reference, pos);
 325                 pos += 4;
 326                 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
 327                         flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
 328                 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
 329                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
 330                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 331                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 332                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 333                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 334                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 335                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 336                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 337                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 338                 put_unaligned_le16(flags, pos);
 339                 pos += 2;
 340                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 341                         *pos++ = status->ampdu_delimiter_crc;
 342                 else
 343                         *pos++ = 0;
 344                 *pos++ = 0;
 345         }
 346
 347         if (status->flag & RX_FLAG_VHT) {
 348                 u16 known = local->hw.radiotap_vht_details;
 349
 350                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 351                 /* known field - how to handle 80+80? */
 352                 if (status->flag & RX_FLAG_80P80MHZ)
 353                         known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 354                 put_unaligned_le16(known, pos);
 355                 pos += 2;
 356                 /* flags */
 357                 if (status->flag & RX_FLAG_SHORT_GI)
 358                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 359                 pos++;
 360                 /* bandwidth */
 361                 if (status->flag & RX_FLAG_80MHZ)
 362                         *pos++ = 4;
 363                 else if (status->flag & RX_FLAG_80P80MHZ)
 364                         *pos++ = 0; /* marked not known above */
 365                 else if (status->flag & RX_FLAG_160MHZ)
 366                         *pos++ = 11;
 367                 else if (status->flag & RX_FLAG_40MHZ)
 368                         *pos++ = 1;
 369                 else /* 20 MHz */
 370                         *pos++ = 0;
 371                 /* MCS/NSS */
 372                 *pos = (status->rate_idx << 4) | status->vht_nss;
 373                 pos += 4;
 374                 /* coding field */
 375                 pos++;
 376                 /* group ID */
 377                 pos++;
 378                 /* partial_aid */
 379                 pos += 2;
 380         }
 381
 382         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 383                 *pos++ = status->chain_signal[chain];
 384                 *pos++ = chain;
 385         }
 386
 387         if (status->vendor_radiotap_len) {
 388                 /* ensure 2 byte alignment for the vendor field as required */
 389                 if ((pos - (u8 *)rthdr) & 1)
 390                         *pos++ = 0;
 391                 *pos++ = status->vendor_radiotap_oui[0];
 392                 *pos++ = status->vendor_radiotap_oui[1];
 393                 *pos++ = status->vendor_radiotap_oui[2];
 394                 *pos++ = status->vendor_radiotap_subns;
 395                 put_unaligned_le16(status->vendor_radiotap_len, pos);
 396                 pos += 2;
 397                 /* align the actual payload as requested */
 398                 while ((pos - (u8 *)rthdr) & (status->vendor_radiotap_align - 1))
 399                         *pos++ = 0;
 400         }
 401 }
 402
 403 /*
 404  * This function copies a received frame to all monitor interfaces and
 405  * returns a cleaned-up SKB that no longer includes the FCS nor the
 406  * radiotap header the driver might have added.
 407  */
 408 static struct sk_buff *
 409 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 410                      struct ieee80211_rate *rate)
 411 {
 412         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 413         struct ieee80211_sub_if_data *sdata;
 414         int needed_headroom;
 415         struct sk_buff *skb, *skb2;
 416         struct net_device *prev_dev = NULL;
 417         int present_fcs_len = 0;
 418
 419         /*
 420          * First, we may need to make a copy of the skb because
 421          *  (1) we need to modify it for radiotap (if not present), and
 422          *  (2) the other RX handlers will modify the skb we got.
 423          *
 424          * We don't need to, of course, if we aren't going to return
 425          * the SKB because it has a bad FCS/PLCP checksum.
 426          */
 427
 428         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
 429                 present_fcs_len = FCS_LEN;
 430
 431         /* ensure hdr->frame_control and vendor radiotap data are in skb head */
 432         if (!pskb_may_pull(origskb, 2 + status->vendor_radiotap_len)) {
 433                 dev_kfree_skb(origskb);
 434                 return NULL;
 435         }
 436
 437         if (!local->monitors) {
 438                 if (should_drop_frame(origskb, present_fcs_len)) {
 439                         dev_kfree_skb(origskb);
 440                         return NULL;
 441                 }
 442
 443                 return remove_monitor_info(local, origskb);
 444         }
 445
 446         /* room for the radiotap header based on driver features */
 447         needed_headroom = ieee80211_rx_radiotap_space(local, status);
 448
 449         if (should_drop_frame(origskb, present_fcs_len)) {
 450                 /* only need to expand headroom if necessary */
 451                 skb = origskb;
 452                 origskb = NULL;
 453
 454                 /*
 455                  * This shouldn't trigger often because most devices have an
 456                  * RX header they pull before we get here, and that should
 457                  * be big enough for our radiotap information. We should
 458                  * probably export the length to drivers so that we can have
 459                  * them allocate enough headroom to start with.
 460                  */
 461                 if (skb_headroom(skb) < needed_headroom &&
 462                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 463                         dev_kfree_skb(skb);
 464                         return NULL;
 465                 }
 466         } else {
 467                 /*
 468                  * Need to make a copy and possibly remove radiotap header
 469                  * and FCS from the original.
 470                  */
 471                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
 472
 473                 origskb = remove_monitor_info(local, origskb);
 474
 475                 if (!skb)
 476                         return origskb;
 477         }
 478
 479         /* prepend radiotap information */
 480         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
 481                                          true);
 482
 483         skb_reset_mac_header(skb);
 484         skb->ip_summed = CHECKSUM_UNNECESSARY;
 485         skb->pkt_type = PACKET_OTHERHOST;
 486         skb->protocol = htons(ETH_P_802_2);
 487
 488         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 489                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
 490                         continue;
 491
 492                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
 493                         continue;
 494
 495                 if (!ieee80211_sdata_running(sdata))
 496                         continue;
 497
 498                 if (prev_dev) {
 499                         skb2 = skb_clone(skb, GFP_ATOMIC);
 500                         if (skb2) {
 501                                 skb2->dev = prev_dev;
 502                                 netif_receive_skb(skb2);
 503                         }
 504                 }
 505
 506                 prev_dev = sdata->dev;
 507                 sdata->dev->stats.rx_packets++;
 508                 sdata->dev->stats.rx_bytes += skb->len;
 509         }
 510
 511         if (prev_dev) {
 512                 skb->dev = prev_dev;
 513                 netif_receive_skb(skb);
 514         } else
 515                 dev_kfree_skb(skb);
 516
 517         return origskb;
 518 }
 519
 520 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 521 {
 522         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 523         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 524         int tid, seqno_idx, security_idx;
 525
 526         /* does the frame have a qos control field? */
 527         if (ieee80211_is_data_qos(hdr->frame_control)) {
 528                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 529                 /* frame has qos control */
 530                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 531                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 532                         status->rx_flags |= IEEE80211_RX_AMSDU;
 533
 534                 seqno_idx = tid;
 535                 security_idx = tid;
 536         } else {
 537                 /*
 538                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 539                  *
 540                  *      Sequence numbers for management frames, QoS data
 541                  *      frames with a broadcast/multicast address in the
 542                  *      Address 1 field, and all non-QoS data frames sent
 543                  *      by QoS STAs are assigned using an additional single
 544                  *      modulo-4096 counter, [...]
 545                  *
 546                  * We also use that counter for non-QoS STAs.
 547                  */
 548                 seqno_idx = IEEE80211_NUM_TIDS;
 549                 security_idx = 0;
 550                 if (ieee80211_is_mgmt(hdr->frame_control))
 551                         security_idx = IEEE80211_NUM_TIDS;
 552                 tid = 0;
 553         }
 554
 555         rx->seqno_idx = seqno_idx;
 556         rx->security_idx = security_idx;
 557         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 558          * For now, set skb->priority to 0 for other cases. */
 559         rx->skb->priority = (tid > 7) ? 0 : tid;
 560 }
 561
 562 /**
 563  * DOC: Packet alignment
 564  *
 565  * Drivers always need to pass packets that are aligned to two-byte boundaries
 566  * to the stack.
 567  *
 568  * Additionally, should, if possible, align the payload data in a way that
 569  * guarantees that the contained IP header is aligned to a four-byte
 570  * boundary. In the case of regular frames, this simply means aligning the
 571  * payload to a four-byte boundary (because either the IP header is directly
 572  * contained, or IV/RFC1042 headers that have a length divisible by four are
 573  * in front of it).  If the payload data is not properly aligned and the
 574  * architecture doesn't support efficient unaligned operations, mac80211
 575  * will align the data.
 576  *
 577  * With A-MSDU frames, however, the payload data address must yield two modulo
 578  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 579  * push the IP header further back to a multiple of four again. Thankfully, the
 580  * specs were sane enough this time around to require padding each A-MSDU
 581  * subframe to a length that is a multiple of four.
 582  *
 583  * Padding like Atheros hardware adds which is between the 802.11 header and
 584  * the payload is not supported, the driver is required to move the 802.11
 585  * header to be directly in front of the payload in that case.
 586  */
 587 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 588 {
 589 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 590         WARN_ONCE((unsigned long)rx->skb->data & 1,
 591                   "unaligned packet at 0x%p\n", rx->skb->data);
 592 #endif
 593 }
 594
 595
 596 /* rx handlers */
 597
 598 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 599 {
 600         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 601
 602         if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
 603                 return 0;
 604
 605         return ieee80211_is_robust_mgmt_frame(hdr);
 606 }
 607
 608
 609 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 610 {
 611         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 612
 613         if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
 614                 return 0;
 615
 616         return ieee80211_is_robust_mgmt_frame(hdr);
 617 }
 618
 619
 620 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 621 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 622 {
 623         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 624         struct ieee80211_mmie *mmie;
 625
 626         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 627                 return -1;
 628
 629         if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
 630                 return -1; /* not a robust management frame */
 631
 632         mmie = (struct ieee80211_mmie *)
 633                 (skb->data + skb->len - sizeof(*mmie));
 634         if (mmie->element_id != WLAN_EID_MMIE ||
 635             mmie->length != sizeof(*mmie) - 2)
 636                 return -1;
 637
 638         return le16_to_cpu(mmie->key_id);
 639 }
 640
 641 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
 642 {
 643         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 644         char *dev_addr = rx->sdata->vif.addr;
 645
 646         if (ieee80211_is_data(hdr->frame_control)) {
 647                 if (is_multicast_ether_addr(hdr->addr1)) {
 648                         if (ieee80211_has_tods(hdr->frame_control) ||
 649                             !ieee80211_has_fromds(hdr->frame_control))
 650                                 return RX_DROP_MONITOR;
 651                         if (ether_addr_equal(hdr->addr3, dev_addr))
 652                                 return RX_DROP_MONITOR;
 653                 } else {
 654                         if (!ieee80211_has_a4(hdr->frame_control))
 655                                 return RX_DROP_MONITOR;
 656                         if (ether_addr_equal(hdr->addr4, dev_addr))
 657                                 return RX_DROP_MONITOR;
 658                 }
 659         }
 660
 661         /* If there is not an established peer link and this is not a peer link
 662          * establisment frame, beacon or probe, drop the frame.
 663          */
 664
 665         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
 666                 struct ieee80211_mgmt *mgmt;
 667
 668                 if (!ieee80211_is_mgmt(hdr->frame_control))
 669                         return RX_DROP_MONITOR;
 670
 671                 if (ieee80211_is_action(hdr->frame_control)) {
 672                         u8 category;
 673
 674                         /* make sure category field is present */
 675                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
 676                                 return RX_DROP_MONITOR;
 677
 678                         mgmt = (struct ieee80211_mgmt *)hdr;
 679                         category = mgmt->u.action.category;
 680                         if (category != WLAN_CATEGORY_MESH_ACTION &&
 681                             category != WLAN_CATEGORY_SELF_PROTECTED)
 682                                 return RX_DROP_MONITOR;
 683                         return RX_CONTINUE;
 684                 }
 685
 686                 if (ieee80211_is_probe_req(hdr->frame_control) ||
 687                     ieee80211_is_probe_resp(hdr->frame_control) ||
 688                     ieee80211_is_beacon(hdr->frame_control) ||
 689                     ieee80211_is_auth(hdr->frame_control))
 690                         return RX_CONTINUE;
 691
 692                 return RX_DROP_MONITOR;
 693         }
 694
 695         return RX_CONTINUE;
 696 }
 697
 698 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
 699                                             struct tid_ampdu_rx *tid_agg_rx,
 700                                             int index,
 701                                             struct sk_buff_head *frames)
 702 {
 703         struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
 704         struct ieee80211_rx_status *status;
 705
 706         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 707
 708         if (!skb)
 709                 goto no_frame;
 710
 711         /* release the frame from the reorder ring buffer */
 712         tid_agg_rx->stored_mpdu_num--;
 713         tid_agg_rx->reorder_buf[index] = NULL;
 714         status = IEEE80211_SKB_RXCB(skb);
 715         status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
 716         __skb_queue_tail(frames, skb);
 717
 718 no_frame:
 719         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 720 }
 721
 722 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
 723                                              struct tid_ampdu_rx *tid_agg_rx,
 724                                              u16 head_seq_num,
 725                                              struct sk_buff_head *frames)
 726 {
 727         int index;
 728
 729         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 730
 731         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
 732                 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
 733                                          tid_agg_rx->ssn) %
 734                                                         tid_agg_rx->buf_size;
 735                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 736                                                 frames);
 737         }
 738 }
 739
 740 /*
 741  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
 742  * the skb was added to the buffer longer than this time ago, the earlier
 743  * frames that have not yet been received are assumed to be lost and the skb
 744  * can be released for processing. This may also release other skb's from the
 745  * reorder buffer if there are no additional gaps between the frames.
 746  *
 747  * Callers must hold tid_agg_rx->reorder_lock.
 748  */
 749 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
 750
 751 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
 752                                           struct tid_ampdu_rx *tid_agg_rx,
 753                                           struct sk_buff_head *frames)
 754 {
 755         int index, j;
 756
 757         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 758
 759         /* release the buffer until next missing frame */
 760         index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
 761                                  tid_agg_rx->ssn) % tid_agg_rx->buf_size;
 762         if (!tid_agg_rx->reorder_buf[index] &&
 763             tid_agg_rx->stored_mpdu_num) {
 764                 /*
 765                  * No buffers ready to be released, but check whether any
 766                  * frames in the reorder buffer have timed out.
 767                  */
 768                 int skipped = 1;
 769                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
 770                      j = (j + 1) % tid_agg_rx->buf_size) {
 771                         if (!tid_agg_rx->reorder_buf[j]) {
 772                                 skipped++;
 773                                 continue;
 774                         }
 775                         if (skipped &&
 776                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
 777                                         HT_RX_REORDER_BUF_TIMEOUT))
 778                                 goto set_release_timer;
 779
 780                         ht_dbg_ratelimited(sdata,
 781                                            "release an RX reorder frame due to timeout on earlier frames\n");
 782                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
 783                                                         frames);
 784
 785                         /*
 786                          * Increment the head seq# also for the skipped slots.
 787                          */
 788                         tid_agg_rx->head_seq_num =
 789                                 (tid_agg_rx->head_seq_num +
 790                                  skipped) & IEEE80211_SN_MASK;
 791                         skipped = 0;
 792                 }
 793         } else while (tid_agg_rx->reorder_buf[index]) {
 794                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 795                                                 frames);
 796                 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
 797                                          tid_agg_rx->ssn) %
 798                                                         tid_agg_rx->buf_size;
 799         }
 800
 801         if (tid_agg_rx->stored_mpdu_num) {
 802                 j = index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
 803                                              tid_agg_rx->ssn) %
 804                                                         tid_agg_rx->buf_size;
 805
 806                 for (; j != (index - 1) % tid_agg_rx->buf_size;
 807                      j = (j + 1) % tid_agg_rx->buf_size) {
 808                         if (tid_agg_rx->reorder_buf[j])
 809                                 break;
 810                 }
 811
 812  set_release_timer:
 813
 814                 mod_timer(&tid_agg_rx->reorder_timer,
 815                           tid_agg_rx->reorder_time[j] + 1 +
 816                           HT_RX_REORDER_BUF_TIMEOUT);
 817         } else {
 818                 del_timer(&tid_agg_rx->reorder_timer);
 819         }
 820 }
 821
 822 /*
 823  * As this function belongs to the RX path it must be under
 824  * rcu_read_lock protection. It returns false if the frame
 825  * can be processed immediately, true if it was consumed.
 826  */
 827 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
 828                                              struct tid_ampdu_rx *tid_agg_rx,
 829                                              struct sk_buff *skb,
 830                                              struct sk_buff_head *frames)
 831 {
 832         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 833         u16 sc = le16_to_cpu(hdr->seq_ctrl);
 834         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
 835         u16 head_seq_num, buf_size;
 836         int index;
 837         bool ret = true;
 838
 839         spin_lock(&tid_agg_rx->reorder_lock);
 840
 841         buf_size = tid_agg_rx->buf_size;
 842         head_seq_num = tid_agg_rx->head_seq_num;
 843
 844         /* frame with out of date sequence number */
 845         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
 846                 dev_kfree_skb(skb);
 847                 goto out;
 848         }
 849
 850         /*
 851          * If frame the sequence number exceeds our buffering window
 852          * size release some previous frames to make room for this one.
 853          */
 854         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
 855                 head_seq_num = ieee80211_sn_inc(
 856                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
 857                 /* release stored frames up to new head to stack */
 858                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
 859                                                  head_seq_num, frames);
 860         }
 861
 862         /* Now the new frame is always in the range of the reordering buffer */
 863
 864         index = ieee80211_sn_sub(mpdu_seq_num,
 865                                  tid_agg_rx->ssn) % tid_agg_rx->buf_size;
 866
 867         /* check if we already stored this frame */
 868         if (tid_agg_rx->reorder_buf[index]) {
 869                 dev_kfree_skb(skb);
 870                 goto out;
 871         }
 872
 873         /*
 874          * If the current MPDU is in the right order and nothing else
 875          * is stored we can process it directly, no need to buffer it.
 876          * If it is first but there's something stored, we may be able
 877          * to release frames after this one.
 878          */
 879         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
 880             tid_agg_rx->stored_mpdu_num == 0) {
 881                 tid_agg_rx->head_seq_num =
 882                         ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 883                 ret = false;
 884                 goto out;
 885         }
 886
 887         /* put the frame in the reordering buffer */
 888         tid_agg_rx->reorder_buf[index] = skb;
 889         tid_agg_rx->reorder_time[index] = jiffies;
 890         tid_agg_rx->stored_mpdu_num++;
 891         ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
 892
 893  out:
 894         spin_unlock(&tid_agg_rx->reorder_lock);
 895         return ret;
 896 }
 897
 898 /*
 899  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
 900  * true if the MPDU was buffered, false if it should be processed.
 901  */
 902 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
 903                                        struct sk_buff_head *frames)
 904 {
 905         struct sk_buff *skb = rx->skb;
 906         struct ieee80211_local *local = rx->local;
 907         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 908         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 909         struct sta_info *sta = rx->sta;
 910         struct tid_ampdu_rx *tid_agg_rx;
 911         u16 sc;
 912         u8 tid, ack_policy;
 913
 914         if (!ieee80211_is_data_qos(hdr->frame_control))
 915                 goto dont_reorder;
 916
 917         /*
 918          * filter the QoS data rx stream according to
 919          * STA/TID and check if this STA/TID is on aggregation
 920          */
 921
 922         if (!sta)
 923                 goto dont_reorder;
 924
 925         ack_policy = *ieee80211_get_qos_ctl(hdr) &
 926                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
 927         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
 928
 929         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
 930         if (!tid_agg_rx)
 931                 goto dont_reorder;
 932
 933         /* qos null data frames are excluded */
 934         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
 935                 goto dont_reorder;
 936
 937         /* not part of a BA session */
 938         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
 939             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
 940                 goto dont_reorder;
 941
 942         /* not actually part of this BA session */
 943         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
 944                 goto dont_reorder;
 945
 946         /* new, potentially un-ordered, ampdu frame - process it */
 947
 948         /* reset session timer */
 949         if (tid_agg_rx->timeout)
 950                 tid_agg_rx->last_rx = jiffies;
 951
 952         /* if this mpdu is fragmented - terminate rx aggregation session */
 953         sc = le16_to_cpu(hdr->seq_ctrl);
 954         if (sc & IEEE80211_SCTL_FRAG) {
 955                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
 956                 skb_queue_tail(&rx->sdata->skb_queue, skb);
 957                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
 958                 return;
 959         }
 960
 961         /*
 962          * No locking needed -- we will only ever process one
 963          * RX packet at a time, and thus own tid_agg_rx. All
 964          * other code manipulating it needs to (and does) make
 965          * sure that we cannot get to it any more before doing
 966          * anything with it.
 967          */
 968         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
 969                                              frames))
 970                 return;
 971
 972  dont_reorder:
 973         __skb_queue_tail(frames, skb);
 974 }
 975
 976 static ieee80211_rx_result debug_noinline
 977 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
 978 {
 979         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 980         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 981
 982         /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
 983         if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
 984                 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
 985                              rx->sta->last_seq_ctrl[rx->seqno_idx] ==
 986                              hdr->seq_ctrl)) {
 987                         if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
 988                                 rx->local->dot11FrameDuplicateCount++;
 989                                 rx->sta->num_duplicates++;
 990                         }
 991                         return RX_DROP_UNUSABLE;
 992                 } else
 993                         rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
 994         }
 995
 996         if (unlikely(rx->skb->len < 16)) {
 997                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
 998                 return RX_DROP_MONITOR;
 999         }
1000
1001         /* Drop disallowed frame classes based on STA auth/assoc state;
1002          * IEEE 802.11, Chap 5.5.
1003          *
1004          * mac80211 filters only based on association state, i.e. it drops
1005          * Class 3 frames from not associated stations. hostapd sends
1006          * deauth/disassoc frames when needed. In addition, hostapd is
1007          * responsible for filtering on both auth and assoc states.
1008          */
1009
1010         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1011                 return ieee80211_rx_mesh_check(rx);
1012
1013         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1014                       ieee80211_is_pspoll(hdr->frame_control)) &&
1015                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1016                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1017                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1018                 /*
1019                  * accept port control frames from the AP even when it's not
1020                  * yet marked ASSOC to prevent a race where we don't set the
1021                  * assoc bit quickly enough before it sends the first frame
1022                  */
1023                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1024                     ieee80211_is_data_present(hdr->frame_control)) {
1025                         unsigned int hdrlen;
1026                         __be16 ethertype;
1027
1028                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1029
1030                         if (rx->skb->len < hdrlen + 8)
1031                                 return RX_DROP_MONITOR;
1032
1033                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1034                         if (ethertype == rx->sdata->control_port_protocol)
1035                                 return RX_CONTINUE;
1036                 }
1037
1038                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1039                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1040                                                hdr->addr2,
1041                                                GFP_ATOMIC))
1042                         return RX_DROP_UNUSABLE;
1043
1044                 return RX_DROP_MONITOR;
1045         }
1046
1047         return RX_CONTINUE;
1048 }
1049
1050
1051 static ieee80211_rx_result debug_noinline
1052 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1053 {
1054         struct sk_buff *skb = rx->skb;
1055         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1056         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1057         int keyidx;
1058         int hdrlen;
1059         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1060         struct ieee80211_key *sta_ptk = NULL;
1061         int mmie_keyidx = -1;
1062         __le16 fc;
1063
1064         /*
1065          * Key selection 101
1066          *
1067          * There are four types of keys:
1068          *  - GTK (group keys)
1069          *  - IGTK (group keys for management frames)
1070          *  - PTK (pairwise keys)
1071          *  - STK (station-to-station pairwise keys)
1072          *
1073          * When selecting a key, we have to distinguish between multicast
1074          * (including broadcast) and unicast frames, the latter can only
1075          * use PTKs and STKs while the former always use GTKs and IGTKs.
1076          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1077          * unicast frames can also use key indices like GTKs. Hence, if we
1078          * don't have a PTK/STK we check the key index for a WEP key.
1079          *
1080          * Note that in a regular BSS, multicast frames are sent by the
1081          * AP only, associated stations unicast the frame to the AP first
1082          * which then multicasts it on their behalf.
1083          *
1084          * There is also a slight problem in IBSS mode: GTKs are negotiated
1085          * with each station, that is something we don't currently handle.
1086          * The spec seems to expect that one negotiates the same key with
1087          * every station but there's no such requirement; VLANs could be
1088          * possible.
1089          */
1090
1091         /*
1092          * No point in finding a key and decrypting if the frame is neither
1093          * addressed to us nor a multicast frame.
1094          */
1095         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1096                 return RX_CONTINUE;
1097
1098         /* start without a key */
1099         rx->key = NULL;
1100
1101         if (rx->sta)
1102                 sta_ptk = rcu_dereference(rx->sta->ptk);
1103
1104         fc = hdr->frame_control;
1105
1106         if (!ieee80211_has_protected(fc))
1107                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1108
1109         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1110                 rx->key = sta_ptk;
1111                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1112                     (status->flag & RX_FLAG_IV_STRIPPED))
1113                         return RX_CONTINUE;
1114                 /* Skip decryption if the frame is not protected. */
1115                 if (!ieee80211_has_protected(fc))
1116                         return RX_CONTINUE;
1117         } else if (mmie_keyidx >= 0) {
1118                 /* Broadcast/multicast robust management frame / BIP */
1119                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1120                     (status->flag & RX_FLAG_IV_STRIPPED))
1121                         return RX_CONTINUE;
1122
1123                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1124                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1125                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1126                 if (rx->sta)
1127                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1128                 if (!rx->key)
1129                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1130         } else if (!ieee80211_has_protected(fc)) {
1131                 /*
1132                  * The frame was not protected, so skip decryption. However, we
1133                  * need to set rx->key if there is a key that could have been
1134                  * used so that the frame may be dropped if encryption would
1135                  * have been expected.
1136                  */
1137                 struct ieee80211_key *key = NULL;
1138                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1139                 int i;
1140
1141                 if (ieee80211_is_mgmt(fc) &&
1142                     is_multicast_ether_addr(hdr->addr1) &&
1143                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1144                         rx->key = key;
1145                 else {
1146                         if (rx->sta) {
1147                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1148                                         key = rcu_dereference(rx->sta->gtk[i]);
1149                                         if (key)
1150                                                 break;
1151                                 }
1152                         }
1153                         if (!key) {
1154                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1155                                         key = rcu_dereference(sdata->keys[i]);
1156                                         if (key)
1157                                                 break;
1158                                 }
1159                         }
1160                         if (key)
1161                                 rx->key = key;
1162                 }
1163                 return RX_CONTINUE;
1164         } else {
1165                 u8 keyid;
1166                 /*
1167                  * The device doesn't give us the IV so we won't be
1168                  * able to look up the key. That's ok though, we
1169                  * don't need to decrypt the frame, we just won't
1170                  * be able to keep statistics accurate.
1171                  * Except for key threshold notifications, should
1172                  * we somehow allow the driver to tell us which key
1173                  * the hardware used if this flag is set?
1174                  */
1175                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1176                     (status->flag & RX_FLAG_IV_STRIPPED))
1177                         return RX_CONTINUE;
1178
1179                 hdrlen = ieee80211_hdrlen(fc);
1180
1181                 if (rx->skb->len < 8 + hdrlen)
1182                         return RX_DROP_UNUSABLE; /* TODO: count this? */
1183
1184                 /*
1185                  * no need to call ieee80211_wep_get_keyidx,
1186                  * it verifies a bunch of things we've done already
1187                  */
1188                 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1189                 keyidx = keyid >> 6;
1190
1191                 /* check per-station GTK first, if multicast packet */
1192                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1193                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1194
1195                 /* if not found, try default key */
1196                 if (!rx->key) {
1197                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1198
1199                         /*
1200                          * RSNA-protected unicast frames should always be
1201                          * sent with pairwise or station-to-station keys,
1202                          * but for WEP we allow using a key index as well.
1203                          */
1204                         if (rx->key &&
1205                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1206                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1207                             !is_multicast_ether_addr(hdr->addr1))
1208                                 rx->key = NULL;
1209                 }
1210         }
1211
1212         if (rx->key) {
1213                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1214                         return RX_DROP_MONITOR;
1215
1216                 rx->key->tx_rx_count++;
1217                 /* TODO: add threshold stuff again */
1218         } else {
1219                 return RX_DROP_MONITOR;
1220         }
1221
1222         switch (rx->key->conf.cipher) {
1223         case WLAN_CIPHER_SUITE_WEP40:
1224         case WLAN_CIPHER_SUITE_WEP104:
1225                 result = ieee80211_crypto_wep_decrypt(rx);
1226                 break;
1227         case WLAN_CIPHER_SUITE_TKIP:
1228                 result = ieee80211_crypto_tkip_decrypt(rx);
1229                 break;
1230         case WLAN_CIPHER_SUITE_CCMP:
1231                 result = ieee80211_crypto_ccmp_decrypt(rx);
1232                 break;
1233         case WLAN_CIPHER_SUITE_AES_CMAC:
1234                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1235                 break;
1236         default:
1237                 /*
1238                  * We can reach here only with HW-only algorithms
1239                  * but why didn't it decrypt the frame?!
1240                  */
1241                 return RX_DROP_UNUSABLE;
1242         }
1243
1244         /* the hdr variable is invalid after the decrypt handlers */
1245
1246         /* either the frame has been decrypted or will be dropped */
1247         status->flag |= RX_FLAG_DECRYPTED;
1248
1249         return result;
1250 }
1251
1252 static ieee80211_rx_result debug_noinline
1253 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1254 {
1255         struct ieee80211_local *local;
1256         struct ieee80211_hdr *hdr;
1257         struct sk_buff *skb;
1258
1259         local = rx->local;
1260         skb = rx->skb;
1261         hdr = (struct ieee80211_hdr *) skb->data;
1262
1263         if (!local->pspolling)
1264                 return RX_CONTINUE;
1265
1266         if (!ieee80211_has_fromds(hdr->frame_control))
1267                 /* this is not from AP */
1268                 return RX_CONTINUE;
1269
1270         if (!ieee80211_is_data(hdr->frame_control))
1271                 return RX_CONTINUE;
1272
1273         if (!ieee80211_has_moredata(hdr->frame_control)) {
1274                 /* AP has no more frames buffered for us */
1275                 local->pspolling = false;
1276                 return RX_CONTINUE;
1277         }
1278
1279         /* more data bit is set, let's request a new frame from the AP */
1280         ieee80211_send_pspoll(local, rx->sdata);
1281
1282         return RX_CONTINUE;
1283 }
1284
1285 static void sta_ps_start(struct sta_info *sta)
1286 {
1287         struct ieee80211_sub_if_data *sdata = sta->sdata;
1288         struct ieee80211_local *local = sdata->local;
1289         struct ps_data *ps;
1290
1291         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1292             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1293                 ps = &sdata->bss->ps;
1294         else
1295                 return;
1296
1297         atomic_inc(&ps->num_sta_ps);
1298         set_sta_flag(sta, WLAN_STA_PS_STA);
1299         if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1300                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1301         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1302                sta->sta.addr, sta->sta.aid);
1303 }
1304
1305 static void sta_ps_end(struct sta_info *sta)
1306 {
1307         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1308                sta->sta.addr, sta->sta.aid);
1309
1310         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1311                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1312                        sta->sta.addr, sta->sta.aid);
1313                 return;
1314         }
1315
1316         ieee80211_sta_ps_deliver_wakeup(sta);
1317 }
1318
1319 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1320 {
1321         struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1322         bool in_ps;
1323
1324         WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1325
1326         /* Don't let the same PS state be set twice */
1327         in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1328         if ((start && in_ps) || (!start && !in_ps))
1329                 return -EINVAL;
1330
1331         if (start)
1332                 sta_ps_start(sta_inf);
1333         else
1334                 sta_ps_end(sta_inf);
1335
1336         return 0;
1337 }
1338 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1339
1340 static ieee80211_rx_result debug_noinline
1341 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1342 {
1343         struct ieee80211_sub_if_data *sdata = rx->sdata;
1344         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1345         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1346         int tid, ac;
1347
1348         if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1349                 return RX_CONTINUE;
1350
1351         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1352             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1353                 return RX_CONTINUE;
1354
1355         /*
1356          * The device handles station powersave, so don't do anything about
1357          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1358          * it to mac80211 since they're handled.)
1359          */
1360         if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1361                 return RX_CONTINUE;
1362
1363         /*
1364          * Don't do anything if the station isn't already asleep. In
1365          * the uAPSD case, the station will probably be marked asleep,
1366          * in the PS-Poll case the station must be confused ...
1367          */
1368         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1369                 return RX_CONTINUE;
1370
1371         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1372                 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1373                         if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1374                                 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1375                         else
1376                                 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1377                 }
1378
1379                 /* Free PS Poll skb here instead of returning RX_DROP that would
1380                  * count as an dropped frame. */
1381                 dev_kfree_skb(rx->skb);
1382
1383                 return RX_QUEUED;
1384         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1385                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1386                    ieee80211_has_pm(hdr->frame_control) &&
1387                    (ieee80211_is_data_qos(hdr->frame_control) ||
1388                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1389                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1390                 ac = ieee802_1d_to_ac[tid & 7];
1391
1392                 /*
1393                  * If this AC is not trigger-enabled do nothing.
1394                  *
1395                  * NB: This could/should check a separate bitmap of trigger-
1396                  * enabled queues, but for now we only implement uAPSD w/o
1397                  * TSPEC changes to the ACs, so they're always the same.
1398                  */
1399                 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1400                         return RX_CONTINUE;
1401
1402                 /* if we are in a service period, do nothing */
1403                 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1404                         return RX_CONTINUE;
1405
1406                 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1407                         ieee80211_sta_ps_deliver_uapsd(rx->sta);
1408                 else
1409                         set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1410         }
1411
1412         return RX_CONTINUE;
1413 }
1414
1415 static ieee80211_rx_result debug_noinline
1416 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1417 {
1418         struct sta_info *sta = rx->sta;
1419         struct sk_buff *skb = rx->skb;
1420         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1421         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1422         int i;
1423
1424         if (!sta)
1425                 return RX_CONTINUE;
1426
1427         /*
1428          * Update last_rx only for IBSS packets which are for the current
1429          * BSSID and for station already AUTHORIZED to avoid keeping the
1430          * current IBSS network alive in cases where other STAs start
1431          * using different BSSID. This will also give the station another
1432          * chance to restart the authentication/authorization in case
1433          * something went wrong the first time.
1434          */
1435         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1436                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1437                                                 NL80211_IFTYPE_ADHOC);
1438                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1439                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1440                         sta->last_rx = jiffies;
1441                         if (ieee80211_is_data(hdr->frame_control)) {
1442                                 sta->last_rx_rate_idx = status->rate_idx;
1443                                 sta->last_rx_rate_flag = status->flag;
1444                                 sta->last_rx_rate_vht_nss = status->vht_nss;
1445                         }
1446                 }
1447         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1448                 /*
1449                  * Mesh beacons will update last_rx when if they are found to
1450                  * match the current local configuration when processed.
1451                  */
1452                 sta->last_rx = jiffies;
1453                 if (ieee80211_is_data(hdr->frame_control)) {
1454                         sta->last_rx_rate_idx = status->rate_idx;
1455                         sta->last_rx_rate_flag = status->flag;
1456                         sta->last_rx_rate_vht_nss = status->vht_nss;
1457                 }
1458         }
1459
1460         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1461                 return RX_CONTINUE;
1462
1463         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1464                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1465
1466         sta->rx_fragments++;
1467         sta->rx_bytes += rx->skb->len;
1468         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1469                 sta->last_signal = status->signal;
1470                 ewma_add(&sta->avg_signal, -status->signal);
1471         }
1472
1473         if (status->chains) {
1474                 sta->chains = status->chains;
1475                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1476                         int signal = status->chain_signal[i];
1477
1478                         if (!(status->chains & BIT(i)))
1479                                 continue;
1480
1481                         sta->chain_signal_last[i] = signal;
1482                         ewma_add(&sta->chain_signal_avg[i], -signal);
1483                 }
1484         }
1485
1486         /*
1487          * Change STA power saving mode only at the end of a frame
1488          * exchange sequence.
1489          */
1490         if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1491             !ieee80211_has_morefrags(hdr->frame_control) &&
1492             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1493             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1494              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1495                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1496                         /*
1497                          * Ignore doze->wake transitions that are
1498                          * indicated by non-data frames, the standard
1499                          * is unclear here, but for example going to
1500                          * PS mode and then scanning would cause a
1501                          * doze->wake transition for the probe request,
1502                          * and that is clearly undesirable.
1503                          */
1504                         if (ieee80211_is_data(hdr->frame_control) &&
1505                             !ieee80211_has_pm(hdr->frame_control))
1506                                 sta_ps_end(sta);
1507                 } else {
1508                         if (ieee80211_has_pm(hdr->frame_control))
1509                                 sta_ps_start(sta);
1510                 }
1511         }
1512
1513         /* mesh power save support */
1514         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1515                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1516
1517         /*
1518          * Drop (qos-)data::nullfunc frames silently, since they
1519          * are used only to control station power saving mode.
1520          */
1521         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1522             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1523                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1524
1525                 /*
1526                  * If we receive a 4-addr nullfunc frame from a STA
1527                  * that was not moved to a 4-addr STA vlan yet send
1528                  * the event to userspace and for older hostapd drop
1529                  * the frame to the monitor interface.
1530                  */
1531                 if (ieee80211_has_a4(hdr->frame_control) &&
1532                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1533                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1534                       !rx->sdata->u.vlan.sta))) {
1535                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1536                                 cfg80211_rx_unexpected_4addr_frame(
1537                                         rx->sdata->dev, sta->sta.addr,
1538                                         GFP_ATOMIC);
1539                         return RX_DROP_MONITOR;
1540                 }
1541                 /*
1542                  * Update counter and free packet here to avoid
1543                  * counting this as a dropped packed.
1544                  */
1545                 sta->rx_packets++;
1546                 dev_kfree_skb(rx->skb);
1547                 return RX_QUEUED;
1548         }
1549
1550         return RX_CONTINUE;
1551 } /* ieee80211_rx_h_sta_process */
1552
1553 static inline struct ieee80211_fragment_entry *
1554 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1555                          unsigned int frag, unsigned int seq, int rx_queue,
1556                          struct sk_buff **skb)
1557 {
1558         struct ieee80211_fragment_entry *entry;
1559
1560         entry = &sdata->fragments[sdata->fragment_next++];
1561         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1562                 sdata->fragment_next = 0;
1563
1564         if (!skb_queue_empty(&entry->skb_list))
1565                 __skb_queue_purge(&entry->skb_list);
1566
1567         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1568         *skb = NULL;
1569         entry->first_frag_time = jiffies;
1570         entry->seq = seq;
1571         entry->rx_queue = rx_queue;
1572         entry->last_frag = frag;
1573         entry->ccmp = 0;
1574         entry->extra_len = 0;
1575
1576         return entry;
1577 }
1578
1579 static inline struct ieee80211_fragment_entry *
1580 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1581                           unsigned int frag, unsigned int seq,
1582                           int rx_queue, struct ieee80211_hdr *hdr)
1583 {
1584         struct ieee80211_fragment_entry *entry;
1585         int i, idx;
1586
1587         idx = sdata->fragment_next;
1588         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1589                 struct ieee80211_hdr *f_hdr;
1590
1591                 idx--;
1592                 if (idx < 0)
1593                         idx = IEEE80211_FRAGMENT_MAX - 1;
1594
1595                 entry = &sdata->fragments[idx];
1596                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1597                     entry->rx_queue != rx_queue ||
1598                     entry->last_frag + 1 != frag)
1599                         continue;
1600
1601                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1602
1603                 /*
1604                  * Check ftype and addresses are equal, else check next fragment
1605                  */
1606                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1607                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1608                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1609                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1610                         continue;
1611
1612                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1613                         __skb_queue_purge(&entry->skb_list);
1614                         continue;
1615                 }
1616                 return entry;
1617         }
1618
1619         return NULL;
1620 }
1621
1622 static ieee80211_rx_result debug_noinline
1623 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1624 {
1625         struct ieee80211_hdr *hdr;
1626         u16 sc;
1627         __le16 fc;
1628         unsigned int frag, seq;
1629         struct ieee80211_fragment_entry *entry;
1630         struct sk_buff *skb;
1631         struct ieee80211_rx_status *status;
1632
1633         hdr = (struct ieee80211_hdr *)rx->skb->data;
1634         fc = hdr->frame_control;
1635
1636         if (ieee80211_is_ctl(fc))
1637                 return RX_CONTINUE;
1638
1639         sc = le16_to_cpu(hdr->seq_ctrl);
1640         frag = sc & IEEE80211_SCTL_FRAG;
1641
1642         if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1643                    is_multicast_ether_addr(hdr->addr1))) {
1644                 /* not fragmented */
1645                 goto out;
1646         }
1647         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1648
1649         if (skb_linearize(rx->skb))
1650                 return RX_DROP_UNUSABLE;
1651
1652         /*
1653          *  skb_linearize() might change the skb->data and
1654          *  previously cached variables (in this case, hdr) need to
1655          *  be refreshed with the new data.
1656          */
1657         hdr = (struct ieee80211_hdr *)rx->skb->data;
1658         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1659
1660         if (frag == 0) {
1661                 /* This is the first fragment of a new frame. */
1662                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1663                                                  rx->seqno_idx, &(rx->skb));
1664                 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1665                     ieee80211_has_protected(fc)) {
1666                         int queue = rx->security_idx;
1667                         /* Store CCMP PN so that we can verify that the next
1668                          * fragment has a sequential PN value. */
1669                         entry->ccmp = 1;
1670                         memcpy(entry->last_pn,
1671                                rx->key->u.ccmp.rx_pn[queue],
1672                                IEEE80211_CCMP_PN_LEN);
1673                 }
1674                 return RX_QUEUED;
1675         }
1676
1677         /* This is a fragment for a frame that should already be pending in
1678          * fragment cache. Add this fragment to the end of the pending entry.
1679          */
1680         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1681                                           rx->seqno_idx, hdr);
1682         if (!entry) {
1683                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1684                 return RX_DROP_MONITOR;
1685         }
1686
1687         /* Verify that MPDUs within one MSDU have sequential PN values.
1688          * (IEEE 802.11i, 8.3.3.4.5) */
1689         if (entry->ccmp) {
1690                 int i;
1691                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1692                 int queue;
1693                 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1694                         return RX_DROP_UNUSABLE;
1695                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1696                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1697                         pn[i]++;
1698                         if (pn[i])
1699                                 break;
1700                 }
1701                 queue = rx->security_idx;
1702                 rpn = rx->key->u.ccmp.rx_pn[queue];
1703                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1704                         return RX_DROP_UNUSABLE;
1705                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1706         }
1707
1708         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1709         __skb_queue_tail(&entry->skb_list, rx->skb);
1710         entry->last_frag = frag;
1711         entry->extra_len += rx->skb->len;
1712         if (ieee80211_has_morefrags(fc)) {
1713                 rx->skb = NULL;
1714                 return RX_QUEUED;
1715         }
1716
1717         rx->skb = __skb_dequeue(&entry->skb_list);
1718         if (skb_tailroom(rx->skb) < entry->extra_len) {
1719                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1720                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1721                                               GFP_ATOMIC))) {
1722                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1723                         __skb_queue_purge(&entry->skb_list);
1724                         return RX_DROP_UNUSABLE;
1725                 }
1726         }
1727         while ((skb = __skb_dequeue(&entry->skb_list))) {
1728                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1729                 dev_kfree_skb(skb);
1730         }
1731
1732         /* Complete frame has been reassembled - process it now */
1733         status = IEEE80211_SKB_RXCB(rx->skb);
1734         status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1735
1736  out:
1737         if (rx->sta)
1738                 rx->sta->rx_packets++;
1739         if (is_multicast_ether_addr(hdr->addr1))
1740                 rx->local->dot11MulticastReceivedFrameCount++;
1741         else
1742                 ieee80211_led_rx(rx->local);
1743         return RX_CONTINUE;
1744 }
1745
1746 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1747 {
1748         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1749                 return -EACCES;
1750
1751         return 0;
1752 }
1753
1754 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1755 {
1756         struct sk_buff *skb = rx->skb;
1757         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1758
1759         /*
1760          * Pass through unencrypted frames if the hardware has
1761          * decrypted them already.
1762          */
1763         if (status->flag & RX_FLAG_DECRYPTED)
1764                 return 0;
1765
1766         /* Drop unencrypted frames if key is set. */
1767         if (unlikely(!ieee80211_has_protected(fc) &&
1768                      !ieee80211_is_nullfunc(fc) &&
1769                      ieee80211_is_data(fc) &&
1770                      (rx->key || rx->sdata->drop_unencrypted)))
1771                 return -EACCES;
1772
1773         return 0;
1774 }
1775
1776 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1777 {
1778         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1779         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1780         __le16 fc = hdr->frame_control;
1781
1782         /*
1783          * Pass through unencrypted frames if the hardware has
1784          * decrypted them already.
1785          */
1786         if (status->flag & RX_FLAG_DECRYPTED)
1787                 return 0;
1788
1789         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1790                 if (unlikely(!ieee80211_has_protected(fc) &&
1791                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1792                              rx->key)) {
1793                         if (ieee80211_is_deauth(fc) ||
1794                             ieee80211_is_disassoc(fc))
1795                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1796                                                              rx->skb->data,
1797                                                              rx->skb->len);
1798                         return -EACCES;
1799                 }
1800                 /* BIP does not use Protected field, so need to check MMIE */
1801                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1802                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1803                         if (ieee80211_is_deauth(fc) ||
1804                             ieee80211_is_disassoc(fc))
1805                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1806                                                              rx->skb->data,
1807                                                              rx->skb->len);
1808                         return -EACCES;
1809                 }
1810                 /*
1811                  * When using MFP, Action frames are not allowed prior to
1812                  * having configured keys.
1813                  */
1814                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1815                              ieee80211_is_robust_mgmt_frame(
1816                                      (struct ieee80211_hdr *) rx->skb->data)))
1817                         return -EACCES;
1818         }
1819
1820         return 0;
1821 }
1822
1823 static int
1824 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1825 {
1826         struct ieee80211_sub_if_data *sdata = rx->sdata;
1827         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1828         bool check_port_control = false;
1829         struct ethhdr *ehdr;
1830         int ret;
1831
1832         *port_control = false;
1833         if (ieee80211_has_a4(hdr->frame_control) &&
1834             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1835                 return -1;
1836
1837         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1838             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1839
1840                 if (!sdata->u.mgd.use_4addr)
1841                         return -1;
1842                 else
1843                         check_port_control = true;
1844         }
1845
1846         if (is_multicast_ether_addr(hdr->addr1) &&
1847             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1848                 return -1;
1849
1850         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1851         if (ret < 0)
1852                 return ret;
1853
1854         ehdr = (struct ethhdr *) rx->skb->data;
1855         if (ehdr->h_proto == rx->sdata->control_port_protocol)
1856                 *port_control = true;
1857         else if (check_port_control)
1858                 return -1;
1859
1860         return 0;
1861 }
1862
1863 /*
1864  * requires that rx->skb is a frame with ethernet header
1865  */
1866 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1867 {
1868         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1869                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1870         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1871
1872         /*
1873          * Allow EAPOL frames to us/the PAE group address regardless
1874          * of whether the frame was encrypted or not.
1875          */
1876         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1877             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1878              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
1879                 return true;
1880
1881         if (ieee80211_802_1x_port_control(rx) ||
1882             ieee80211_drop_unencrypted(rx, fc))
1883                 return false;
1884
1885         return true;
1886 }
1887
1888 /*
1889  * requires that rx->skb is a frame with ethernet header
1890  */
1891 static void
1892 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1893 {
1894         struct ieee80211_sub_if_data *sdata = rx->sdata;
1895         struct net_device *dev = sdata->dev;
1896         struct sk_buff *skb, *xmit_skb;
1897         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1898         struct sta_info *dsta;
1899         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1900
1901         skb = rx->skb;
1902         xmit_skb = NULL;
1903
1904         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1905              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1906             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1907             (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1908             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1909                 if (is_multicast_ether_addr(ehdr->h_dest)) {
1910                         /*
1911                          * send multicast frames both to higher layers in
1912                          * local net stack and back to the wireless medium
1913                          */
1914                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
1915                         if (!xmit_skb)
1916                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
1917                                                     dev->name);
1918                 } else {
1919                         dsta = sta_info_get(sdata, skb->data);
1920                         if (dsta) {
1921                                 /*
1922                                  * The destination station is associated to
1923                                  * this AP (in this VLAN), so send the frame
1924                                  * directly to it and do not pass it to local
1925                                  * net stack.
1926                                  */
1927                                 xmit_skb = skb;
1928                                 skb = NULL;
1929                         }
1930                 }
1931         }
1932
1933         if (skb) {
1934                 int align __maybe_unused;
1935
1936 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1937                 /*
1938                  * 'align' will only take the values 0 or 2 here
1939                  * since all frames are required to be aligned
1940                  * to 2-byte boundaries when being passed to
1941                  * mac80211; the code here works just as well if
1942                  * that isn't true, but mac80211 assumes it can
1943                  * access fields as 2-byte aligned (e.g. for
1944                  * compare_ether_addr)
1945                  */
1946                 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1947                 if (align) {
1948                         if (WARN_ON(skb_headroom(skb) < 3)) {
1949                                 dev_kfree_skb(skb);
1950                                 skb = NULL;
1951                         } else {
1952                                 u8 *data = skb->data;
1953                                 size_t len = skb_headlen(skb);
1954                                 skb->data -= align;
1955                                 memmove(skb->data, data, len);
1956                                 skb_set_tail_pointer(skb, len);
1957                         }
1958                 }
1959 #endif
1960
1961                 if (skb) {
1962                         /* deliver to local stack */
1963                         skb->protocol = eth_type_trans(skb, dev);
1964                         memset(skb->cb, 0, sizeof(skb->cb));
1965                         netif_receive_skb(skb);
1966                 }
1967         }
1968
1969         if (xmit_skb) {
1970                 /*
1971                  * Send to wireless media and increase priority by 256 to
1972                  * keep the received priority instead of reclassifying
1973                  * the frame (see cfg80211_classify8021d).
1974                  */
1975                 xmit_skb->priority += 256;
1976                 xmit_skb->protocol = htons(ETH_P_802_3);
1977                 skb_reset_network_header(xmit_skb);
1978                 skb_reset_mac_header(xmit_skb);
1979                 dev_queue_xmit(xmit_skb);
1980         }
1981 }
1982
1983 static ieee80211_rx_result debug_noinline
1984 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1985 {
1986         struct net_device *dev = rx->sdata->dev;
1987         struct sk_buff *skb = rx->skb;
1988         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1989         __le16 fc = hdr->frame_control;
1990         struct sk_buff_head frame_list;
1991         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1992
1993         if (unlikely(!ieee80211_is_data(fc)))
1994                 return RX_CONTINUE;
1995
1996         if (unlikely(!ieee80211_is_data_present(fc)))
1997                 return RX_DROP_MONITOR;
1998
1999         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2000                 return RX_CONTINUE;
2001
2002         if (ieee80211_has_a4(hdr->frame_control) &&
2003             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2004             !rx->sdata->u.vlan.sta)
2005                 return RX_DROP_UNUSABLE;
2006
2007         if (is_multicast_ether_addr(hdr->addr1) &&
2008             ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2009               rx->sdata->u.vlan.sta) ||
2010              (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2011               rx->sdata->u.mgd.use_4addr)))
2012                 return RX_DROP_UNUSABLE;
2013
2014         skb->dev = dev;
2015         __skb_queue_head_init(&frame_list);
2016
2017         if (skb_linearize(skb))
2018                 return RX_DROP_UNUSABLE;
2019
2020         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2021                                  rx->sdata->vif.type,
2022                                  rx->local->hw.extra_tx_headroom, true);
2023
2024         while (!skb_queue_empty(&frame_list)) {
2025                 rx->skb = __skb_dequeue(&frame_list);
2026
2027                 if (!ieee80211_frame_allowed(rx, fc)) {
2028                         dev_kfree_skb(rx->skb);
2029                         continue;
2030                 }
2031                 dev->stats.rx_packets++;
2032                 dev->stats.rx_bytes += rx->skb->len;
2033
2034                 ieee80211_deliver_skb(rx);
2035         }
2036
2037         return RX_QUEUED;
2038 }
2039
2040 #ifdef CONFIG_MAC80211_MESH
2041 static ieee80211_rx_result
2042 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2043 {
2044         struct ieee80211_hdr *fwd_hdr, *hdr;
2045         struct ieee80211_tx_info *info;
2046         struct ieee80211s_hdr *mesh_hdr;
2047         struct sk_buff *skb = rx->skb, *fwd_skb;
2048         struct ieee80211_local *local = rx->local;
2049         struct ieee80211_sub_if_data *sdata = rx->sdata;
2050         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2051         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2052         __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
2053         u16 q, hdrlen;
2054
2055         hdr = (struct ieee80211_hdr *) skb->data;
2056         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2057
2058         /* make sure fixed part of mesh header is there, also checks skb len */
2059         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2060                 return RX_DROP_MONITOR;
2061
2062         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2063
2064         /* make sure full mesh header is there, also checks skb len */
2065         if (!pskb_may_pull(rx->skb,
2066                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2067                 return RX_DROP_MONITOR;
2068
2069         /* reload pointers */
2070         hdr = (struct ieee80211_hdr *) skb->data;
2071         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2072
2073         /* frame is in RMC, don't forward */
2074         if (ieee80211_is_data(hdr->frame_control) &&
2075             is_multicast_ether_addr(hdr->addr1) &&
2076             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2077                 return RX_DROP_MONITOR;
2078
2079         if (!ieee80211_is_data(hdr->frame_control) ||
2080             !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2081                 return RX_CONTINUE;
2082
2083         if (!mesh_hdr->ttl)
2084                 return RX_DROP_MONITOR;
2085
2086         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2087                 struct mesh_path *mppath;
2088                 char *proxied_addr;
2089                 char *mpp_addr;
2090
2091                 if (is_multicast_ether_addr(hdr->addr1)) {
2092                         mpp_addr = hdr->addr3;
2093                         proxied_addr = mesh_hdr->eaddr1;
2094                 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2095                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2096                         mpp_addr = hdr->addr4;
2097                         proxied_addr = mesh_hdr->eaddr2;
2098                 } else {
2099                         return RX_DROP_MONITOR;
2100                 }
2101
2102                 rcu_read_lock();
2103                 mppath = mpp_path_lookup(sdata, proxied_addr);
2104                 if (!mppath) {
2105                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2106                 } else {
2107                         spin_lock_bh(&mppath->state_lock);
2108                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2109                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2110                         spin_unlock_bh(&mppath->state_lock);
2111                 }
2112                 rcu_read_unlock();
2113         }
2114
2115         /* Frame has reached destination.  Don't forward */
2116         if (!is_multicast_ether_addr(hdr->addr1) &&
2117             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2118                 return RX_CONTINUE;
2119
2120         q = ieee80211_select_queue_80211(sdata, skb, hdr);
2121         if (ieee80211_queue_stopped(&local->hw, q)) {
2122                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2123                 return RX_DROP_MONITOR;
2124         }
2125         skb_set_queue_mapping(skb, q);
2126
2127         if (!--mesh_hdr->ttl) {
2128                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2129                 goto out;
2130         }
2131
2132         if (!ifmsh->mshcfg.dot11MeshForwarding)
2133                 goto out;
2134
2135         fwd_skb = skb_copy(skb, GFP_ATOMIC);
2136         if (!fwd_skb) {
2137                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2138                                     sdata->name);
2139                 goto out;
2140         }
2141
2142         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2143         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2144         info = IEEE80211_SKB_CB(fwd_skb);
2145         memset(info, 0, sizeof(*info));
2146         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2147         info->control.vif = &rx->sdata->vif;
2148         info->control.jiffies = jiffies;
2149         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2150                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2151                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2152                 /* update power mode indication when forwarding */
2153                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2154         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2155                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2156                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2157         } else {
2158                 /* unable to resolve next hop */
2159                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2160                                    fwd_hdr->addr3, 0, reason, fwd_hdr->addr2);
2161                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2162                 kfree_skb(fwd_skb);
2163                 return RX_DROP_MONITOR;
2164         }
2165
2166         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2167         ieee80211_add_pending_skb(local, fwd_skb);
2168  out:
2169         if (is_multicast_ether_addr(hdr->addr1) ||
2170             sdata->dev->flags & IFF_PROMISC)
2171                 return RX_CONTINUE;
2172         else
2173                 return RX_DROP_MONITOR;
2174 }
2175 #endif
2176
2177 static ieee80211_rx_result debug_noinline
2178 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2179 {
2180         struct ieee80211_sub_if_data *sdata = rx->sdata;
2181         struct ieee80211_local *local = rx->local;
2182         struct net_device *dev = sdata->dev;
2183         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2184         __le16 fc = hdr->frame_control;
2185         bool port_control;
2186         int err;
2187
2188         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2189                 return RX_CONTINUE;
2190
2191         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2192                 return RX_DROP_MONITOR;
2193
2194         /*
2195          * Send unexpected-4addr-frame event to hostapd. For older versions,
2196          * also drop the frame to cooked monitor interfaces.
2197          */
2198         if (ieee80211_has_a4(hdr->frame_control) &&
2199             sdata->vif.type == NL80211_IFTYPE_AP) {
2200                 if (rx->sta &&
2201                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2202                         cfg80211_rx_unexpected_4addr_frame(
2203                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2204                 return RX_DROP_MONITOR;
2205         }
2206
2207         err = __ieee80211_data_to_8023(rx, &port_control);
2208         if (unlikely(err))
2209                 return RX_DROP_UNUSABLE;
2210
2211         if (!ieee80211_frame_allowed(rx, fc))
2212                 return RX_DROP_MONITOR;
2213
2214         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2215             unlikely(port_control) && sdata->bss) {
2216                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2217                                      u.ap);
2218                 dev = sdata->dev;
2219                 rx->sdata = sdata;
2220         }
2221
2222         rx->skb->dev = dev;
2223
2224         dev->stats.rx_packets++;
2225         dev->stats.rx_bytes += rx->skb->len;
2226
2227         if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2228             !is_multicast_ether_addr(
2229                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2230             (!local->scanning &&
2231              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2232                         mod_timer(&local->dynamic_ps_timer, jiffies +
2233                          msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2234         }
2235
2236         ieee80211_deliver_skb(rx);
2237
2238         return RX_QUEUED;
2239 }
2240
2241 static ieee80211_rx_result debug_noinline
2242 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2243 {
2244         struct sk_buff *skb = rx->skb;
2245         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2246         struct tid_ampdu_rx *tid_agg_rx;
2247         u16 start_seq_num;
2248         u16 tid;
2249
2250         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2251                 return RX_CONTINUE;
2252
2253         if (ieee80211_is_back_req(bar->frame_control)) {
2254                 struct {
2255                         __le16 control, start_seq_num;
2256                 } __packed bar_data;
2257
2258                 if (!rx->sta)
2259                         return RX_DROP_MONITOR;
2260
2261                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2262                                   &bar_data, sizeof(bar_data)))
2263                         return RX_DROP_MONITOR;
2264
2265                 tid = le16_to_cpu(bar_data.control) >> 12;
2266
2267                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2268                 if (!tid_agg_rx)
2269                         return RX_DROP_MONITOR;
2270
2271                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2272
2273                 /* reset session timer */
2274                 if (tid_agg_rx->timeout)
2275                         mod_timer(&tid_agg_rx->session_timer,
2276                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2277
2278                 spin_lock(&tid_agg_rx->reorder_lock);
2279                 /* release stored frames up to start of BAR */
2280                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2281                                                  start_seq_num, frames);
2282                 spin_unlock(&tid_agg_rx->reorder_lock);
2283
2284                 kfree_skb(skb);
2285                 return RX_QUEUED;
2286         }
2287
2288         /*
2289          * After this point, we only want management frames,
2290          * so we can drop all remaining control frames to
2291          * cooked monitor interfaces.
2292          */
2293         return RX_DROP_MONITOR;
2294 }
2295
2296 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2297                                            struct ieee80211_mgmt *mgmt,
2298                                            size_t len)
2299 {
2300         struct ieee80211_local *local = sdata->local;
2301         struct sk_buff *skb;
2302         struct ieee80211_mgmt *resp;
2303
2304         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2305                 /* Not to own unicast address */
2306                 return;
2307         }
2308
2309         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2310             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2311                 /* Not from the current AP or not associated yet. */
2312                 return;
2313         }
2314
2315         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2316                 /* Too short SA Query request frame */
2317                 return;
2318         }
2319
2320         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2321         if (skb == NULL)
2322                 return;
2323
2324         skb_reserve(skb, local->hw.extra_tx_headroom);
2325         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2326         memset(resp, 0, 24);
2327         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2328         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2329         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2330         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2331                                           IEEE80211_STYPE_ACTION);
2332         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2333         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2334         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2335         memcpy(resp->u.action.u.sa_query.trans_id,
2336                mgmt->u.action.u.sa_query.trans_id,
2337                WLAN_SA_QUERY_TR_ID_LEN);
2338
2339         ieee80211_tx_skb(sdata, skb);
2340 }
2341
2342 static ieee80211_rx_result debug_noinline
2343 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2344 {
2345         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2346         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2347
2348         /*
2349          * From here on, look only at management frames.
2350          * Data and control frames are already handled,
2351          * and unknown (reserved) frames are useless.
2352          */
2353         if (rx->skb->len < 24)
2354                 return RX_DROP_MONITOR;
2355
2356         if (!ieee80211_is_mgmt(mgmt->frame_control))
2357                 return RX_DROP_MONITOR;
2358
2359         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2360             ieee80211_is_beacon(mgmt->frame_control) &&
2361             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2362                 int sig = 0;
2363
2364                 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2365                         sig = status->signal;
2366
2367                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2368                                             rx->skb->data, rx->skb->len,
2369                                             status->freq, sig);
2370                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2371         }
2372
2373         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2374                 return RX_DROP_MONITOR;
2375
2376         if (ieee80211_drop_unencrypted_mgmt(rx))
2377                 return RX_DROP_UNUSABLE;
2378
2379         return RX_CONTINUE;
2380 }
2381
2382 static ieee80211_rx_result debug_noinline
2383 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2384 {
2385         struct ieee80211_local *local = rx->local;
2386         struct ieee80211_sub_if_data *sdata = rx->sdata;
2387         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2388         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2389         int len = rx->skb->len;
2390
2391         if (!ieee80211_is_action(mgmt->frame_control))
2392                 return RX_CONTINUE;
2393
2394         /* drop too small frames */
2395         if (len < IEEE80211_MIN_ACTION_SIZE)
2396                 return RX_DROP_UNUSABLE;
2397
2398         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2399             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED)
2400                 return RX_DROP_UNUSABLE;
2401
2402         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2403                 return RX_DROP_UNUSABLE;
2404
2405         switch (mgmt->u.action.category) {
2406         case WLAN_CATEGORY_HT:
2407                 /* reject HT action frames from stations not supporting HT */
2408                 if (!rx->sta->sta.ht_cap.ht_supported)
2409                         goto invalid;
2410
2411                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2412                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2413                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2414                     sdata->vif.type != NL80211_IFTYPE_AP &&
2415                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2416                         break;
2417
2418                 /* verify action & smps_control/chanwidth are present */
2419                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2420                         goto invalid;
2421
2422                 switch (mgmt->u.action.u.ht_smps.action) {
2423                 case WLAN_HT_ACTION_SMPS: {
2424                         struct ieee80211_supported_band *sband;
2425                         enum ieee80211_smps_mode smps_mode;
2426
2427                         /* convert to HT capability */
2428                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2429                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2430                                 smps_mode = IEEE80211_SMPS_OFF;
2431                                 break;
2432                         case WLAN_HT_SMPS_CONTROL_STATIC:
2433                                 smps_mode = IEEE80211_SMPS_STATIC;
2434                                 break;
2435                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2436                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2437                                 break;
2438                         default:
2439                                 goto invalid;
2440                         }
2441
2442                         /* if no change do nothing */
2443                         if (rx->sta->sta.smps_mode == smps_mode)
2444                                 goto handled;
2445                         rx->sta->sta.smps_mode = smps_mode;
2446
2447                         sband = rx->local->hw.wiphy->bands[status->band];
2448
2449                         rate_control_rate_update(local, sband, rx->sta,
2450                                                  IEEE80211_RC_SMPS_CHANGED);
2451                         goto handled;
2452                 }
2453                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2454                         struct ieee80211_supported_band *sband;
2455                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2456                         enum ieee80211_sta_rx_bandwidth new_bw;
2457
2458                         /* If it doesn't support 40 MHz it can't change ... */
2459                         if (!(rx->sta->sta.ht_cap.cap &
2460                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2461                                 goto handled;
2462
2463                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2464                                 new_bw = IEEE80211_STA_RX_BW_20;
2465                         else
2466                                 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2467
2468                         if (rx->sta->sta.bandwidth == new_bw)
2469                                 goto handled;
2470
2471                         sband = rx->local->hw.wiphy->bands[status->band];
2472
2473                         rate_control_rate_update(local, sband, rx->sta,
2474                                                  IEEE80211_RC_BW_CHANGED);
2475                         goto handled;
2476                 }
2477                 default:
2478                         goto invalid;
2479                 }
2480
2481                 break;
2482         case WLAN_CATEGORY_PUBLIC:
2483                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2484                         goto invalid;
2485                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2486                         break;
2487                 if (!rx->sta)
2488                         break;
2489                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2490                         break;
2491                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2492                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2493                         break;
2494                 if (len < offsetof(struct ieee80211_mgmt,
2495                                    u.action.u.ext_chan_switch.variable))
2496                         goto invalid;
2497                 goto queue;
2498         case WLAN_CATEGORY_VHT:
2499                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2500                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2501                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2502                     sdata->vif.type != NL80211_IFTYPE_AP &&
2503                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2504                         break;
2505
2506                 /* verify action code is present */
2507                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2508                         goto invalid;
2509
2510                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2511                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2512                         u8 opmode;
2513
2514                         /* verify opmode is present */
2515                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2516                                 goto invalid;
2517
2518                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2519
2520                         ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2521                                                     opmode, status->band,
2522                                                     false);
2523                         goto handled;
2524                 }
2525                 default:
2526                         break;
2527                 }
2528                 break;
2529         case WLAN_CATEGORY_BACK:
2530                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2531                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2532                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2533                     sdata->vif.type != NL80211_IFTYPE_AP &&
2534                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2535                         break;
2536
2537                 /* verify action_code is present */
2538                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2539                         break;
2540
2541                 switch (mgmt->u.action.u.addba_req.action_code) {
2542                 case WLAN_ACTION_ADDBA_REQ:
2543                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2544                                    sizeof(mgmt->u.action.u.addba_req)))
2545                                 goto invalid;
2546                         break;
2547                 case WLAN_ACTION_ADDBA_RESP:
2548                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2549                                    sizeof(mgmt->u.action.u.addba_resp)))
2550                                 goto invalid;
2551                         break;
2552                 case WLAN_ACTION_DELBA:
2553                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2554                                    sizeof(mgmt->u.action.u.delba)))
2555                                 goto invalid;
2556                         break;
2557                 default:
2558                         goto invalid;
2559                 }
2560
2561                 goto queue;
2562         case WLAN_CATEGORY_SPECTRUM_MGMT:
2563                 if (status->band != IEEE80211_BAND_5GHZ)
2564                         break;
2565
2566                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2567                         break;
2568
2569                 /* verify action_code is present */
2570                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2571                         break;
2572
2573                 switch (mgmt->u.action.u.measurement.action_code) {
2574                 case WLAN_ACTION_SPCT_MSR_REQ:
2575                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2576                                    sizeof(mgmt->u.action.u.measurement)))
2577                                 break;
2578                         ieee80211_process_measurement_req(sdata, mgmt, len);
2579                         goto handled;
2580                 case WLAN_ACTION_SPCT_CHL_SWITCH:
2581                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2582                                 break;
2583
2584                         if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2585                                 break;
2586
2587                         goto queue;
2588                 }
2589                 break;
2590         case WLAN_CATEGORY_SA_QUERY:
2591                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2592                            sizeof(mgmt->u.action.u.sa_query)))
2593                         break;
2594
2595                 switch (mgmt->u.action.u.sa_query.action) {
2596                 case WLAN_ACTION_SA_QUERY_REQUEST:
2597                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2598                                 break;
2599                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2600                         goto handled;
2601                 }
2602                 break;
2603         case WLAN_CATEGORY_SELF_PROTECTED:
2604                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2605                            sizeof(mgmt->u.action.u.self_prot.action_code)))
2606                         break;
2607
2608                 switch (mgmt->u.action.u.self_prot.action_code) {
2609                 case WLAN_SP_MESH_PEERING_OPEN:
2610                 case WLAN_SP_MESH_PEERING_CLOSE:
2611                 case WLAN_SP_MESH_PEERING_CONFIRM:
2612                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2613                                 goto invalid;
2614                         if (sdata->u.mesh.user_mpm)
2615                                 /* userspace handles this frame */
2616                                 break;
2617                         goto queue;
2618                 case WLAN_SP_MGK_INFORM:
2619                 case WLAN_SP_MGK_ACK:
2620                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2621                                 goto invalid;
2622                         break;
2623                 }
2624                 break;
2625         case WLAN_CATEGORY_MESH_ACTION:
2626                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2627                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
2628                         break;
2629
2630                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2631                         break;
2632                 if (mesh_action_is_path_sel(mgmt) &&
2633                     !mesh_path_sel_is_hwmp(sdata))
2634                         break;
2635                 goto queue;
2636         }
2637
2638         return RX_CONTINUE;
2639
2640  invalid:
2641         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2642         /* will return in the next handlers */
2643         return RX_CONTINUE;
2644
2645  handled:
2646         if (rx->sta)
2647                 rx->sta->rx_packets++;
2648         dev_kfree_skb(rx->skb);
2649         return RX_QUEUED;
2650
2651  queue:
2652         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2653         skb_queue_tail(&sdata->skb_queue, rx->skb);
2654         ieee80211_queue_work(&local->hw, &sdata->work);
2655         if (rx->sta)
2656                 rx->sta->rx_packets++;
2657         return RX_QUEUED;
2658 }
2659
2660 static ieee80211_rx_result debug_noinline
2661 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2662 {
2663         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2664         int sig = 0;
2665
2666         /* skip known-bad action frames and return them in the next handler */
2667         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2668                 return RX_CONTINUE;
2669
2670         /*
2671          * Getting here means the kernel doesn't know how to handle
2672          * it, but maybe userspace does ... include returned frames
2673          * so userspace can register for those to know whether ones
2674          * it transmitted were processed or returned.
2675          */
2676
2677         if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2678                 sig = status->signal;
2679
2680         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2681                              rx->skb->data, rx->skb->len,
2682                              GFP_ATOMIC)) {
2683                 if (rx->sta)
2684                         rx->sta->rx_packets++;
2685                 dev_kfree_skb(rx->skb);
2686                 return RX_QUEUED;
2687         }
2688
2689         return RX_CONTINUE;
2690 }
2691
2692 static ieee80211_rx_result debug_noinline
2693 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2694 {
2695         struct ieee80211_local *local = rx->local;
2696         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2697         struct sk_buff *nskb;
2698         struct ieee80211_sub_if_data *sdata = rx->sdata;
2699         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2700
2701         if (!ieee80211_is_action(mgmt->frame_control))
2702                 return RX_CONTINUE;
2703
2704         /*
2705          * For AP mode, hostapd is responsible for handling any action
2706          * frames that we didn't handle, including returning unknown
2707          * ones. For all other modes we will return them to the sender,
2708          * setting the 0x80 bit in the action category, as required by
2709          * 802.11-2012 9.24.4.
2710          * Newer versions of hostapd shall also use the management frame
2711          * registration mechanisms, but older ones still use cooked
2712          * monitor interfaces so push all frames there.
2713          */
2714         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2715             (sdata->vif.type == NL80211_IFTYPE_AP ||
2716              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2717                 return RX_DROP_MONITOR;
2718
2719         if (is_multicast_ether_addr(mgmt->da))
2720                 return RX_DROP_MONITOR;
2721
2722         /* do not return rejected action frames */
2723         if (mgmt->u.action.category & 0x80)
2724                 return RX_DROP_UNUSABLE;
2725
2726         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2727                                GFP_ATOMIC);
2728         if (nskb) {
2729                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2730
2731                 nmgmt->u.action.category |= 0x80;
2732                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2733                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2734
2735                 memset(nskb->cb, 0, sizeof(nskb->cb));
2736
2737                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2738                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2739
2740                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2741                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2742                                       IEEE80211_TX_CTL_NO_CCK_RATE;
2743                         if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2744                                 info->hw_queue =
2745                                         local->hw.offchannel_tx_hw_queue;
2746                 }
2747
2748                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2749                                             status->band);
2750         }
2751         dev_kfree_skb(rx->skb);
2752         return RX_QUEUED;
2753 }
2754
2755 static ieee80211_rx_result debug_noinline
2756 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2757 {
2758         struct ieee80211_sub_if_data *sdata = rx->sdata;
2759         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2760         __le16 stype;
2761
2762         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2763
2764         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2765             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2766             sdata->vif.type != NL80211_IFTYPE_STATION)
2767                 return RX_DROP_MONITOR;
2768
2769         switch (stype) {
2770         case cpu_to_le16(IEEE80211_STYPE_AUTH):
2771         case cpu_to_le16(IEEE80211_STYPE_BEACON):
2772         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2773                 /* process for all: mesh, mlme, ibss */
2774                 break;
2775         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2776         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2777         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2778         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2779                 if (is_multicast_ether_addr(mgmt->da) &&
2780                     !is_broadcast_ether_addr(mgmt->da))
2781                         return RX_DROP_MONITOR;
2782
2783                 /* process only for station */
2784                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2785                         return RX_DROP_MONITOR;
2786                 break;
2787         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2788                 /* process only for ibss and mesh */
2789                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2790                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2791                         return RX_DROP_MONITOR;
2792                 break;
2793         default:
2794                 return RX_DROP_MONITOR;
2795         }
2796
2797         /* queue up frame and kick off work to process it */
2798         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2799         skb_queue_tail(&sdata->skb_queue, rx->skb);
2800         ieee80211_queue_work(&rx->local->hw, &sdata->work);
2801         if (rx->sta)
2802                 rx->sta->rx_packets++;
2803
2804         return RX_QUEUED;
2805 }
2806
2807 /* TODO: use IEEE80211_RX_FRAGMENTED */
2808 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2809                                         struct ieee80211_rate *rate)
2810 {
2811         struct ieee80211_sub_if_data *sdata;
2812         struct ieee80211_local *local = rx->local;
2813         struct sk_buff *skb = rx->skb, *skb2;
2814         struct net_device *prev_dev = NULL;
2815         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2816         int needed_headroom;
2817
2818         /*
2819          * If cooked monitor has been processed already, then
2820          * don't do it again. If not, set the flag.
2821          */
2822         if (rx->flags & IEEE80211_RX_CMNTR)
2823                 goto out_free_skb;
2824         rx->flags |= IEEE80211_RX_CMNTR;
2825
2826         /* If there are no cooked monitor interfaces, just free the SKB */
2827         if (!local->cooked_mntrs)
2828                 goto out_free_skb;
2829
2830         /* room for the radiotap header based on driver features */
2831         needed_headroom = ieee80211_rx_radiotap_space(local, status);
2832
2833         if (skb_headroom(skb) < needed_headroom &&
2834             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2835                 goto out_free_skb;
2836
2837         /* prepend radiotap information */
2838         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2839                                          false);
2840
2841         skb_set_mac_header(skb, 0);
2842         skb->ip_summed = CHECKSUM_UNNECESSARY;
2843         skb->pkt_type = PACKET_OTHERHOST;
2844         skb->protocol = htons(ETH_P_802_2);
2845
2846         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2847                 if (!ieee80211_sdata_running(sdata))
2848                         continue;
2849
2850                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2851                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2852                         continue;
2853
2854                 if (prev_dev) {
2855                         skb2 = skb_clone(skb, GFP_ATOMIC);
2856                         if (skb2) {
2857                                 skb2->dev = prev_dev;
2858                                 netif_receive_skb(skb2);
2859                         }
2860                 }
2861
2862                 prev_dev = sdata->dev;
2863                 sdata->dev->stats.rx_packets++;
2864                 sdata->dev->stats.rx_bytes += skb->len;
2865         }
2866
2867         if (prev_dev) {
2868                 skb->dev = prev_dev;
2869                 netif_receive_skb(skb);
2870                 return;
2871         }
2872
2873  out_free_skb:
2874         dev_kfree_skb(skb);
2875 }
2876
2877 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2878                                          ieee80211_rx_result res)
2879 {
2880         switch (res) {
2881         case RX_DROP_MONITOR:
2882                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2883                 if (rx->sta)
2884                         rx->sta->rx_dropped++;
2885                 /* fall through */
2886         case RX_CONTINUE: {
2887                 struct ieee80211_rate *rate = NULL;
2888                 struct ieee80211_supported_band *sband;
2889                 struct ieee80211_rx_status *status;
2890
2891                 status = IEEE80211_SKB_RXCB((rx->skb));
2892
2893                 sband = rx->local->hw.wiphy->bands[status->band];
2894                 if (!(status->flag & RX_FLAG_HT) &&
2895                     !(status->flag & RX_FLAG_VHT))
2896                         rate = &sband->bitrates[status->rate_idx];
2897
2898                 ieee80211_rx_cooked_monitor(rx, rate);
2899                 break;
2900                 }
2901         case RX_DROP_UNUSABLE:
2902                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2903                 if (rx->sta)
2904                         rx->sta->rx_dropped++;
2905                 dev_kfree_skb(rx->skb);
2906                 break;
2907         case RX_QUEUED:
2908                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2909                 break;
2910         }
2911 }
2912
2913 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2914                                   struct sk_buff_head *frames)
2915 {
2916         ieee80211_rx_result res = RX_DROP_MONITOR;
2917         struct sk_buff *skb;
2918
2919 #define CALL_RXH(rxh)                   \
2920         do {                            \
2921                 res = rxh(rx);          \
2922                 if (res != RX_CONTINUE) \
2923                         goto rxh_next;  \
2924         } while (0);
2925
2926         spin_lock_bh(&rx->local->rx_path_lock);
2927
2928         while ((skb = __skb_dequeue(frames))) {
2929                 /*
2930                  * all the other fields are valid across frames
2931                  * that belong to an aMPDU since they are on the
2932                  * same TID from the same station
2933                  */
2934                 rx->skb = skb;
2935
2936                 CALL_RXH(ieee80211_rx_h_decrypt)
2937                 CALL_RXH(ieee80211_rx_h_check_more_data)
2938                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2939                 CALL_RXH(ieee80211_rx_h_sta_process)
2940                 CALL_RXH(ieee80211_rx_h_defragment)
2941                 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2942                 /* must be after MMIC verify so header is counted in MPDU mic */
2943 #ifdef CONFIG_MAC80211_MESH
2944                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2945                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
2946 #endif
2947                 CALL_RXH(ieee80211_rx_h_amsdu)
2948                 CALL_RXH(ieee80211_rx_h_data)
2949
2950                 /* special treatment -- needs the queue */
2951                 res = ieee80211_rx_h_ctrl(rx, frames);
2952                 if (res != RX_CONTINUE)
2953                         goto rxh_next;
2954
2955                 CALL_RXH(ieee80211_rx_h_mgmt_check)
2956                 CALL_RXH(ieee80211_rx_h_action)
2957                 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2958                 CALL_RXH(ieee80211_rx_h_action_return)
2959                 CALL_RXH(ieee80211_rx_h_mgmt)
2960
2961  rxh_next:
2962                 ieee80211_rx_handlers_result(rx, res);
2963
2964 #undef CALL_RXH
2965         }
2966
2967         spin_unlock_bh(&rx->local->rx_path_lock);
2968 }
2969
2970 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2971 {
2972         struct sk_buff_head reorder_release;
2973         ieee80211_rx_result res = RX_DROP_MONITOR;
2974
2975         __skb_queue_head_init(&reorder_release);
2976
2977 #define CALL_RXH(rxh)                   \
2978         do {                            \
2979                 res = rxh(rx);          \
2980                 if (res != RX_CONTINUE) \
2981                         goto rxh_next;  \
2982         } while (0);
2983
2984         CALL_RXH(ieee80211_rx_h_check)
2985
2986         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
2987
2988         ieee80211_rx_handlers(rx, &reorder_release);
2989         return;
2990
2991  rxh_next:
2992         ieee80211_rx_handlers_result(rx, res);
2993
2994 #undef CALL_RXH
2995 }
2996
2997 /*
2998  * This function makes calls into the RX path, therefore
2999  * it has to be invoked under RCU read lock.
3000  */
3001 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3002 {
3003         struct sk_buff_head frames;
3004         struct ieee80211_rx_data rx = {
3005                 .sta = sta,
3006                 .sdata = sta->sdata,
3007                 .local = sta->local,
3008                 /* This is OK -- must be QoS data frame */
3009                 .security_idx = tid,
3010                 .seqno_idx = tid,
3011                 .flags = 0,
3012         };
3013         struct tid_ampdu_rx *tid_agg_rx;
3014
3015         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3016         if (!tid_agg_rx)
3017                 return;
3018
3019         __skb_queue_head_init(&frames);
3020
3021         spin_lock(&tid_agg_rx->reorder_lock);
3022         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3023         spin_unlock(&tid_agg_rx->reorder_lock);
3024
3025         ieee80211_rx_handlers(&rx, &frames);
3026 }
3027
3028 /* main receive path */
3029
3030 static int prepare_for_handlers(struct ieee80211_rx_data *rx,
3031                                 struct ieee80211_hdr *hdr)
3032 {
3033         struct ieee80211_sub_if_data *sdata = rx->sdata;
3034         struct sk_buff *skb = rx->skb;
3035         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3036         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3037         int multicast = is_multicast_ether_addr(hdr->addr1);
3038
3039         switch (sdata->vif.type) {
3040         case NL80211_IFTYPE_STATION:
3041                 if (!bssid && !sdata->u.mgd.use_4addr)
3042                         return 0;
3043                 if (!multicast &&
3044                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3045                         if (!(sdata->dev->flags & IFF_PROMISC) ||
3046                             sdata->u.mgd.use_4addr)
3047                                 return 0;
3048                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3049                 }
3050                 break;
3051         case NL80211_IFTYPE_ADHOC:
3052                 if (!bssid)
3053                         return 0;
3054                 if (ieee80211_is_beacon(hdr->frame_control)) {
3055                         return 1;
3056                 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3057                         return 0;
3058                 } else if (!multicast &&
3059                            !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3060                         if (!(sdata->dev->flags & IFF_PROMISC))
3061                                 return 0;
3062                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3063                 } else if (!rx->sta) {
3064                         int rate_idx;
3065                         if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3066                                 rate_idx = 0; /* TODO: HT/VHT rates */
3067                         else
3068                                 rate_idx = status->rate_idx;
3069                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3070                                                  BIT(rate_idx));
3071                 }
3072                 break;
3073         case NL80211_IFTYPE_MESH_POINT:
3074                 if (!multicast &&
3075                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3076                         if (!(sdata->dev->flags & IFF_PROMISC))
3077                                 return 0;
3078
3079                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3080                 }
3081                 break;
3082         case NL80211_IFTYPE_AP_VLAN:
3083         case NL80211_IFTYPE_AP:
3084                 if (!bssid) {
3085                         if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3086                                 return 0;
3087                 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3088                         /*
3089                          * Accept public action frames even when the
3090                          * BSSID doesn't match, this is used for P2P
3091                          * and location updates. Note that mac80211
3092                          * itself never looks at these frames.
3093                          */
3094                         if (!multicast &&
3095                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3096                                 return 0;
3097                         if (ieee80211_is_public_action(hdr, skb->len))
3098                                 return 1;
3099                         if (!ieee80211_is_beacon(hdr->frame_control))
3100                                 return 0;
3101                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3102                 }
3103                 break;
3104         case NL80211_IFTYPE_WDS:
3105                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3106                         return 0;
3107                 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3108                         return 0;
3109                 break;
3110         case NL80211_IFTYPE_P2P_DEVICE:
3111                 if (!ieee80211_is_public_action(hdr, skb->len) &&
3112                     !ieee80211_is_probe_req(hdr->frame_control) &&
3113                     !ieee80211_is_probe_resp(hdr->frame_control) &&
3114                     !ieee80211_is_beacon(hdr->frame_control))
3115                         return 0;
3116                 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3117                     !multicast)
3118                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3119                 break;
3120         default:
3121                 /* should never get here */
3122                 WARN_ON_ONCE(1);
3123                 break;
3124         }
3125
3126         return 1;
3127 }
3128
3129 /*
3130  * This function returns whether or not the SKB
3131  * was destined for RX processing or not, which,
3132  * if consume is true, is equivalent to whether
3133  * or not the skb was consumed.
3134  */
3135 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3136                                             struct sk_buff *skb, bool consume)
3137 {
3138         struct ieee80211_local *local = rx->local;
3139         struct ieee80211_sub_if_data *sdata = rx->sdata;
3140         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3141         struct ieee80211_hdr *hdr = (void *)skb->data;
3142         int prepares;
3143
3144         rx->skb = skb;
3145         status->rx_flags |= IEEE80211_RX_RA_MATCH;
3146         prepares = prepare_for_handlers(rx, hdr);
3147
3148         if (!prepares)
3149                 return false;
3150
3151         if (!consume) {
3152                 skb = skb_copy(skb, GFP_ATOMIC);
3153                 if (!skb) {
3154                         if (net_ratelimit())
3155                                 wiphy_debug(local->hw.wiphy,
3156                                         "failed to copy skb for %s\n",
3157                                         sdata->name);
3158                         return true;
3159                 }
3160
3161                 rx->skb = skb;
3162         }
3163
3164         ieee80211_invoke_rx_handlers(rx);
3165         return true;
3166 }
3167
3168 /*
3169  * This is the actual Rx frames handler. as it blongs to Rx path it must
3170  * be called with rcu_read_lock protection.
3171  */
3172 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3173                                          struct sk_buff *skb)
3174 {
3175         struct ieee80211_local *local = hw_to_local(hw);
3176         struct ieee80211_sub_if_data *sdata;
3177         struct ieee80211_hdr *hdr;
3178         __le16 fc;
3179         struct ieee80211_rx_data rx;
3180         struct ieee80211_sub_if_data *prev;
3181         struct sta_info *sta, *tmp, *prev_sta;
3182         int err = 0;
3183
3184         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3185         memset(&rx, 0, sizeof(rx));
3186         rx.skb = skb;
3187         rx.local = local;
3188
3189         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3190                 local->dot11ReceivedFragmentCount++;
3191
3192         if (ieee80211_is_mgmt(fc)) {
3193                 /* drop frame if too short for header */
3194                 if (skb->len < ieee80211_hdrlen(fc))
3195                         err = -ENOBUFS;
3196                 else
3197                         err = skb_linearize(skb);
3198         } else {
3199                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3200         }
3201
3202         if (err) {
3203                 dev_kfree_skb(skb);
3204                 return;
3205         }
3206
3207         hdr = (struct ieee80211_hdr *)skb->data;
3208         ieee80211_parse_qos(&rx);
3209         ieee80211_verify_alignment(&rx);
3210
3211         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3212                      ieee80211_is_beacon(hdr->frame_control)))
3213                 ieee80211_scan_rx(local, skb);
3214
3215         if (ieee80211_is_data(fc)) {
3216                 prev_sta = NULL;
3217
3218                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
3219                         if (!prev_sta) {
3220                                 prev_sta = sta;
3221                                 continue;
3222                         }
3223
3224                         rx.sta = prev_sta;
3225                         rx.sdata = prev_sta->sdata;
3226                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
3227
3228                         prev_sta = sta;
3229                 }
3230
3231                 if (prev_sta) {
3232                         rx.sta = prev_sta;
3233                         rx.sdata = prev_sta->sdata;
3234
3235                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3236                                 return;
3237                         goto out;
3238                 }
3239         }
3240
3241         prev = NULL;
3242
3243         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3244                 if (!ieee80211_sdata_running(sdata))
3245                         continue;
3246
3247                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3248                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3249                         continue;
3250
3251                 /*
3252                  * frame is destined for this interface, but if it's
3253                  * not also for the previous one we handle that after
3254                  * the loop to avoid copying the SKB once too much
3255                  */
3256
3257                 if (!prev) {
3258                         prev = sdata;
3259                         continue;
3260                 }
3261
3262                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3263                 rx.sdata = prev;
3264                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3265
3266                 prev = sdata;
3267         }
3268
3269         if (prev) {
3270                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3271                 rx.sdata = prev;
3272
3273                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3274                         return;
3275         }
3276
3277  out:
3278         dev_kfree_skb(skb);
3279 }
3280
3281 /*
3282  * This is the receive path handler. It is called by a low level driver when an
3283  * 802.11 MPDU is received from the hardware.
3284  */
3285 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3286 {
3287         struct ieee80211_local *local = hw_to_local(hw);
3288         struct ieee80211_rate *rate = NULL;
3289         struct ieee80211_supported_band *sband;
3290         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3291
3292         WARN_ON_ONCE(softirq_count() == 0);
3293
3294         if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3295                 goto drop;
3296
3297         sband = local->hw.wiphy->bands[status->band];
3298         if (WARN_ON(!sband))
3299                 goto drop;
3300
3301         /*
3302          * If we're suspending, it is possible although not too likely
3303          * that we'd be receiving frames after having already partially
3304          * quiesced the stack. We can't process such frames then since
3305          * that might, for example, cause stations to be added or other
3306          * driver callbacks be invoked.
3307          */
3308         if (unlikely(local->quiescing || local->suspended))
3309                 goto drop;
3310
3311         /* We might be during a HW reconfig, prevent Rx for the same reason */
3312         if (unlikely(local->in_reconfig))
3313                 goto drop;
3314
3315         /*
3316          * The same happens when we're not even started,
3317          * but that's worth a warning.
3318          */
3319         if (WARN_ON(!local->started))
3320                 goto drop;
3321
3322         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3323                 /*
3324                  * Validate the rate, unless a PLCP error means that
3325                  * we probably can't have a valid rate here anyway.
3326                  */
3327
3328                 if (status->flag & RX_FLAG_HT) {
3329                         /*
3330                          * rate_idx is MCS index, which can be [0-76]
3331                          * as documented on:
3332                          *
3333                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3334                          *
3335                          * Anything else would be some sort of driver or
3336                          * hardware error. The driver should catch hardware
3337                          * errors.
3338                          */
3339                         if (WARN(status->rate_idx > 76,
3340                                  "Rate marked as an HT rate but passed "
3341                                  "status->rate_idx is not "
3342                                  "an MCS index [0-76]: %d (0x%02x)\n",
3343                                  status->rate_idx,
3344                                  status->rate_idx))
3345                                 goto drop;
3346                 } else if (status->flag & RX_FLAG_VHT) {
3347                         if (WARN_ONCE(status->rate_idx > 9 ||
3348                                       !status->vht_nss ||
3349                                       status->vht_nss > 8,
3350                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3351                                       status->rate_idx, status->vht_nss))
3352                                 goto drop;
3353                 } else {
3354                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3355                                 goto drop;
3356                         rate = &sband->bitrates[status->rate_idx];
3357                 }
3358         }
3359
3360         status->rx_flags = 0;
3361
3362         /*
3363          * key references and virtual interfaces are protected using RCU
3364          * and this requires that we are in a read-side RCU section during
3365          * receive processing
3366          */
3367         rcu_read_lock();
3368
3369         /*
3370          * Frames with failed FCS/PLCP checksum are not returned,
3371          * all other frames are returned without radiotap header
3372          * if it was previously present.
3373          * Also, frames with less than 16 bytes are dropped.
3374          */
3375         skb = ieee80211_rx_monitor(local, skb, rate);
3376         if (!skb) {
3377                 rcu_read_unlock();
3378                 return;
3379         }
3380
3381         ieee80211_tpt_led_trig_rx(local,
3382                         ((struct ieee80211_hdr *)skb->data)->frame_control,
3383                         skb->len);
3384         __ieee80211_rx_handle_packet(hw, skb);
3385
3386         rcu_read_unlock();
3387
3388         return;
3389  drop:
3390         kfree_skb(skb);
3391 }
3392 EXPORT_SYMBOL(ieee80211_rx);
3393
3394 /* This is a version of the rx handler that can be called from hard irq
3395  * context. Post the skb on the queue and schedule the tasklet */
3396 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3397 {
3398         struct ieee80211_local *local = hw_to_local(hw);
3399
3400         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3401
3402         skb->pkt_type = IEEE80211_RX_MSG;
3403         skb_queue_tail(&local->skb_queue, skb);
3404         tasklet_schedule(&local->tasklet);
3405 }
3406 EXPORT_SYMBOL(ieee80211_rx_irqsafe);