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) + 9;
  91
  92         /* allocate extra bitmap */
  93         if (status->vendor_radiotap_len)
  94                 len += 4;
  95
  96         if (ieee80211_have_rx_timestamp(status)) {
  97                 len = ALIGN(len, 8);
  98                 len += 8;
  99         }
 100         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 101                 len += 1;
 102
 103         /* padding for RX_FLAGS if necessary */
 104         len = ALIGN(len, 2);
 105
 106         if (status->flag & RX_FLAG_HT) /* HT info */
 107                 len += 3;
 108
 109         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 110                 len = ALIGN(len, 4);
 111                 len += 8;
 112         }
 113
 114         if (status->flag & RX_FLAG_VHT) {
 115                 len = ALIGN(len, 2);
 116                 len += 12;
 117         }
 118
 119         if (status->vendor_radiotap_len) {
 120                 if (WARN_ON_ONCE(status->vendor_radiotap_align == 0))
 121                         status->vendor_radiotap_align = 1;
 122                 /* align standard part of vendor namespace */
 123                 len = ALIGN(len, 2);
 124                 /* allocate standard part of vendor namespace */
 125                 len += 6;
 126                 /* align vendor-defined part */
 127                 len = ALIGN(len, status->vendor_radiotap_align);
 128                 /* vendor-defined part is already in skb */
 129         }
 130
 131         return len;
 132 }
 133
 134 /*
 135  * ieee80211_add_rx_radiotap_header - add radiotap header
 136  *
 137  * add a radiotap header containing all the fields which the hardware provided.
 138  */
 139 static void
 140 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 141                                  struct sk_buff *skb,
 142                                  struct ieee80211_rate *rate,
 143                                  int rtap_len, bool has_fcs)
 144 {
 145         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 146         struct ieee80211_radiotap_header *rthdr;
 147         unsigned char *pos;
 148         u16 rx_flags = 0;
 149         int mpdulen;
 150
 151         mpdulen = skb->len;
 152         if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
 153                 mpdulen += FCS_LEN;
 154
 155         rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
 156         memset(rthdr, 0, rtap_len);
 157
 158         /* radiotap header, set always present flags */
 159         rthdr->it_present =
 160                 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
 161                             (1 << IEEE80211_RADIOTAP_CHANNEL) |
 162                             (1 << IEEE80211_RADIOTAP_ANTENNA) |
 163                             (1 << IEEE80211_RADIOTAP_RX_FLAGS));
 164         rthdr->it_len = cpu_to_le16(rtap_len + status->vendor_radiotap_len);
 165
 166         pos = (unsigned char *)(rthdr + 1);
 167
 168         if (status->vendor_radiotap_len) {
 169                 rthdr->it_present |=
 170                         cpu_to_le32(BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE)) |
 171                         cpu_to_le32(BIT(IEEE80211_RADIOTAP_EXT));
 172                 put_unaligned_le32(status->vendor_radiotap_bitmap, pos);
 173                 pos += 4;
 174         }
 175
 176         /* the order of the following fields is important */
 177
 178         /* IEEE80211_RADIOTAP_TSFT */
 179         if (ieee80211_have_rx_timestamp(status)) {
 180                 /* padding */
 181                 while ((pos - (u8 *)rthdr) & 7)
 182                         *pos++ = 0;
 183                 put_unaligned_le64(
 184                         ieee80211_calculate_rx_timestamp(local, status,
 185                                                          mpdulen, 0),
 186                         pos);
 187                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 188                 pos += 8;
 189         }
 190
 191         /* IEEE80211_RADIOTAP_FLAGS */
 192         if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
 193                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 194         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 195                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 196         if (status->flag & RX_FLAG_SHORTPRE)
 197                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 198         pos++;
 199
 200         /* IEEE80211_RADIOTAP_RATE */
 201         if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
 202                 /*
 203                  * Without rate information don't add it. If we have,
 204                  * MCS information is a separate field in radiotap,
 205                  * added below. The byte here is needed as padding
 206                  * for the channel though, so initialise it to 0.
 207                  */
 208                 *pos = 0;
 209         } else {
 210                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 211                 *pos = rate->bitrate / 5;
 212         }
 213         pos++;
 214
 215         /* IEEE80211_RADIOTAP_CHANNEL */
 216         put_unaligned_le16(status->freq, pos);
 217         pos += 2;
 218         if (status->band == IEEE80211_BAND_5GHZ)
 219                 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
 220                                    pos);
 221         else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
 222                 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
 223                                    pos);
 224         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 225                 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
 226                                    pos);
 227         else if (rate)
 228                 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
 229                                    pos);
 230         else
 231                 put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
 232         pos += 2;
 233
 234         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 235         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
 236             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 237                 *pos = status->signal;
 238                 rthdr->it_present |=
 239                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 240                 pos++;
 241         }
 242
 243         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 244
 245         /* IEEE80211_RADIOTAP_ANTENNA */
 246         *pos = status->antenna;
 247         pos++;
 248
 249         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 250
 251         /* IEEE80211_RADIOTAP_RX_FLAGS */
 252         /* ensure 2 byte alignment for the 2 byte field as required */
 253         if ((pos - (u8 *)rthdr) & 1)
 254                 *pos++ = 0;
 255         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 256                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 257         put_unaligned_le16(rx_flags, pos);
 258         pos += 2;
 259
 260         if (status->flag & RX_FLAG_HT) {
 261                 unsigned int stbc;
 262
 263                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 264                 *pos++ = local->hw.radiotap_mcs_details;
 265                 *pos = 0;
 266                 if (status->flag & RX_FLAG_SHORT_GI)
 267                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 268                 if (status->flag & RX_FLAG_40MHZ)
 269                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 270                 if (status->flag & RX_FLAG_HT_GF)
 271                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 272                 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
 273                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 274                 pos++;
 275                 *pos++ = status->rate_idx;
 276         }
 277
 278         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 279                 u16 flags = 0;
 280
 281                 /* ensure 4 byte alignment */
 282                 while ((pos - (u8 *)rthdr) & 3)
 283                         pos++;
 284                 rthdr->it_present |=
 285                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 286                 put_unaligned_le32(status->ampdu_reference, pos);
 287                 pos += 4;
 288                 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
 289                         flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
 290                 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
 291                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
 292                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 293                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 294                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 295                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 296                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 297                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 298                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 299                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 300                 put_unaligned_le16(flags, pos);
 301                 pos += 2;
 302                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 303                         *pos++ = status->ampdu_delimiter_crc;
 304                 else
 305                         *pos++ = 0;
 306                 *pos++ = 0;
 307         }
 308
 309         if (status->flag & RX_FLAG_VHT) {
 310                 u16 known = local->hw.radiotap_vht_details;
 311
 312                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 313                 /* known field - how to handle 80+80? */
 314                 if (status->flag & RX_FLAG_80P80MHZ)
 315                         known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 316                 put_unaligned_le16(known, pos);
 317                 pos += 2;
 318                 /* flags */
 319                 if (status->flag & RX_FLAG_SHORT_GI)
 320                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 321                 pos++;
 322                 /* bandwidth */
 323                 if (status->flag & RX_FLAG_80MHZ)
 324                         *pos++ = 4;
 325                 else if (status->flag & RX_FLAG_80P80MHZ)
 326                         *pos++ = 0; /* marked not known above */
 327                 else if (status->flag & RX_FLAG_160MHZ)
 328                         *pos++ = 11;
 329                 else if (status->flag & RX_FLAG_40MHZ)
 330                         *pos++ = 1;
 331                 else /* 20 MHz */
 332                         *pos++ = 0;
 333                 /* MCS/NSS */
 334                 *pos = (status->rate_idx << 4) | status->vht_nss;
 335                 pos += 4;
 336                 /* coding field */
 337                 pos++;
 338                 /* group ID */
 339                 pos++;
 340                 /* partial_aid */
 341                 pos += 2;
 342         }
 343
 344         if (status->vendor_radiotap_len) {
 345                 /* ensure 2 byte alignment for the vendor field as required */
 346                 if ((pos - (u8 *)rthdr) & 1)
 347                         *pos++ = 0;
 348                 *pos++ = status->vendor_radiotap_oui[0];
 349                 *pos++ = status->vendor_radiotap_oui[1];
 350                 *pos++ = status->vendor_radiotap_oui[2];
 351                 *pos++ = status->vendor_radiotap_subns;
 352                 put_unaligned_le16(status->vendor_radiotap_len, pos);
 353                 pos += 2;
 354                 /* align the actual payload as requested */
 355                 while ((pos - (u8 *)rthdr) & (status->vendor_radiotap_align - 1))
 356                         *pos++ = 0;
 357         }
 358 }
 359
 360 /*
 361  * This function copies a received frame to all monitor interfaces and
 362  * returns a cleaned-up SKB that no longer includes the FCS nor the
 363  * radiotap header the driver might have added.
 364  */
 365 static struct sk_buff *
 366 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 367                      struct ieee80211_rate *rate)
 368 {
 369         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 370         struct ieee80211_sub_if_data *sdata;
 371         int needed_headroom;
 372         struct sk_buff *skb, *skb2;
 373         struct net_device *prev_dev = NULL;
 374         int present_fcs_len = 0;
 375
 376         /*
 377          * First, we may need to make a copy of the skb because
 378          *  (1) we need to modify it for radiotap (if not present), and
 379          *  (2) the other RX handlers will modify the skb we got.
 380          *
 381          * We don't need to, of course, if we aren't going to return
 382          * the SKB because it has a bad FCS/PLCP checksum.
 383          */
 384
 385         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
 386                 present_fcs_len = FCS_LEN;
 387
 388         /* ensure hdr->frame_control and vendor radiotap data are in skb head */
 389         if (!pskb_may_pull(origskb, 2 + status->vendor_radiotap_len)) {
 390                 dev_kfree_skb(origskb);
 391                 return NULL;
 392         }
 393
 394         if (!local->monitors) {
 395                 if (should_drop_frame(origskb, present_fcs_len)) {
 396                         dev_kfree_skb(origskb);
 397                         return NULL;
 398                 }
 399
 400                 return remove_monitor_info(local, origskb);
 401         }
 402
 403         /* room for the radiotap header based on driver features */
 404         needed_headroom = ieee80211_rx_radiotap_space(local, status);
 405
 406         if (should_drop_frame(origskb, present_fcs_len)) {
 407                 /* only need to expand headroom if necessary */
 408                 skb = origskb;
 409                 origskb = NULL;
 410
 411                 /*
 412                  * This shouldn't trigger often because most devices have an
 413                  * RX header they pull before we get here, and that should
 414                  * be big enough for our radiotap information. We should
 415                  * probably export the length to drivers so that we can have
 416                  * them allocate enough headroom to start with.
 417                  */
 418                 if (skb_headroom(skb) < needed_headroom &&
 419                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 420                         dev_kfree_skb(skb);
 421                         return NULL;
 422                 }
 423         } else {
 424                 /*
 425                  * Need to make a copy and possibly remove radiotap header
 426                  * and FCS from the original.
 427                  */
 428                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
 429
 430                 origskb = remove_monitor_info(local, origskb);
 431
 432                 if (!skb)
 433                         return origskb;
 434         }
 435
 436         /* prepend radiotap information */
 437         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
 438                                          true);
 439
 440         skb_reset_mac_header(skb);
 441         skb->ip_summed = CHECKSUM_UNNECESSARY;
 442         skb->pkt_type = PACKET_OTHERHOST;
 443         skb->protocol = htons(ETH_P_802_2);
 444
 445         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 446                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
 447                         continue;
 448
 449                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
 450                         continue;
 451
 452                 if (!ieee80211_sdata_running(sdata))
 453                         continue;
 454
 455                 if (prev_dev) {
 456                         skb2 = skb_clone(skb, GFP_ATOMIC);
 457                         if (skb2) {
 458                                 skb2->dev = prev_dev;
 459                                 netif_receive_skb(skb2);
 460                         }
 461                 }
 462
 463                 prev_dev = sdata->dev;
 464                 sdata->dev->stats.rx_packets++;
 465                 sdata->dev->stats.rx_bytes += skb->len;
 466         }
 467
 468         if (prev_dev) {
 469                 skb->dev = prev_dev;
 470                 netif_receive_skb(skb);
 471         } else
 472                 dev_kfree_skb(skb);
 473
 474         return origskb;
 475 }
 476
 477 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 478 {
 479         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 480         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 481         int tid, seqno_idx, security_idx;
 482
 483         /* does the frame have a qos control field? */
 484         if (ieee80211_is_data_qos(hdr->frame_control)) {
 485                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 486                 /* frame has qos control */
 487                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 488                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 489                         status->rx_flags |= IEEE80211_RX_AMSDU;
 490
 491                 seqno_idx = tid;
 492                 security_idx = tid;
 493         } else {
 494                 /*
 495                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 496                  *
 497                  *      Sequence numbers for management frames, QoS data
 498                  *      frames with a broadcast/multicast address in the
 499                  *      Address 1 field, and all non-QoS data frames sent
 500                  *      by QoS STAs are assigned using an additional single
 501                  *      modulo-4096 counter, [...]
 502                  *
 503                  * We also use that counter for non-QoS STAs.
 504                  */
 505                 seqno_idx = IEEE80211_NUM_TIDS;
 506                 security_idx = 0;
 507                 if (ieee80211_is_mgmt(hdr->frame_control))
 508                         security_idx = IEEE80211_NUM_TIDS;
 509                 tid = 0;
 510         }
 511
 512         rx->seqno_idx = seqno_idx;
 513         rx->security_idx = security_idx;
 514         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 515          * For now, set skb->priority to 0 for other cases. */
 516         rx->skb->priority = (tid > 7) ? 0 : tid;
 517 }
 518
 519 /**
 520  * DOC: Packet alignment
 521  *
 522  * Drivers always need to pass packets that are aligned to two-byte boundaries
 523  * to the stack.
 524  *
 525  * Additionally, should, if possible, align the payload data in a way that
 526  * guarantees that the contained IP header is aligned to a four-byte
 527  * boundary. In the case of regular frames, this simply means aligning the
 528  * payload to a four-byte boundary (because either the IP header is directly
 529  * contained, or IV/RFC1042 headers that have a length divisible by four are
 530  * in front of it).  If the payload data is not properly aligned and the
 531  * architecture doesn't support efficient unaligned operations, mac80211
 532  * will align the data.
 533  *
 534  * With A-MSDU frames, however, the payload data address must yield two modulo
 535  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 536  * push the IP header further back to a multiple of four again. Thankfully, the
 537  * specs were sane enough this time around to require padding each A-MSDU
 538  * subframe to a length that is a multiple of four.
 539  *
 540  * Padding like Atheros hardware adds which is between the 802.11 header and
 541  * the payload is not supported, the driver is required to move the 802.11
 542  * header to be directly in front of the payload in that case.
 543  */
 544 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 545 {
 546 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 547         WARN_ONCE((unsigned long)rx->skb->data & 1,
 548                   "unaligned packet at 0x%p\n", rx->skb->data);
 549 #endif
 550 }
 551
 552
 553 /* rx handlers */
 554
 555 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 556 {
 557         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 558
 559         if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
 560                 return 0;
 561
 562         return ieee80211_is_robust_mgmt_frame(hdr);
 563 }
 564
 565
 566 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 567 {
 568         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 569
 570         if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
 571                 return 0;
 572
 573         return ieee80211_is_robust_mgmt_frame(hdr);
 574 }
 575
 576
 577 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 578 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 579 {
 580         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 581         struct ieee80211_mmie *mmie;
 582
 583         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 584                 return -1;
 585
 586         if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
 587                 return -1; /* not a robust management frame */
 588
 589         mmie = (struct ieee80211_mmie *)
 590                 (skb->data + skb->len - sizeof(*mmie));
 591         if (mmie->element_id != WLAN_EID_MMIE ||
 592             mmie->length != sizeof(*mmie) - 2)
 593                 return -1;
 594
 595         return le16_to_cpu(mmie->key_id);
 596 }
 597
 598 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
 599 {
 600         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 601         char *dev_addr = rx->sdata->vif.addr;
 602
 603         if (ieee80211_is_data(hdr->frame_control)) {
 604                 if (is_multicast_ether_addr(hdr->addr1)) {
 605                         if (ieee80211_has_tods(hdr->frame_control) ||
 606                             !ieee80211_has_fromds(hdr->frame_control))
 607                                 return RX_DROP_MONITOR;
 608                         if (ether_addr_equal(hdr->addr3, dev_addr))
 609                                 return RX_DROP_MONITOR;
 610                 } else {
 611                         if (!ieee80211_has_a4(hdr->frame_control))
 612                                 return RX_DROP_MONITOR;
 613                         if (ether_addr_equal(hdr->addr4, dev_addr))
 614                                 return RX_DROP_MONITOR;
 615                 }
 616         }
 617
 618         /* If there is not an established peer link and this is not a peer link
 619          * establisment frame, beacon or probe, drop the frame.
 620          */
 621
 622         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
 623                 struct ieee80211_mgmt *mgmt;
 624
 625                 if (!ieee80211_is_mgmt(hdr->frame_control))
 626                         return RX_DROP_MONITOR;
 627
 628                 if (ieee80211_is_action(hdr->frame_control)) {
 629                         u8 category;
 630
 631                         /* make sure category field is present */
 632                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
 633                                 return RX_DROP_MONITOR;
 634
 635                         mgmt = (struct ieee80211_mgmt *)hdr;
 636                         category = mgmt->u.action.category;
 637                         if (category != WLAN_CATEGORY_MESH_ACTION &&
 638                             category != WLAN_CATEGORY_SELF_PROTECTED)
 639                                 return RX_DROP_MONITOR;
 640                         return RX_CONTINUE;
 641                 }
 642
 643                 if (ieee80211_is_probe_req(hdr->frame_control) ||
 644                     ieee80211_is_probe_resp(hdr->frame_control) ||
 645                     ieee80211_is_beacon(hdr->frame_control) ||
 646                     ieee80211_is_auth(hdr->frame_control))
 647                         return RX_CONTINUE;
 648
 649                 return RX_DROP_MONITOR;
 650         }
 651
 652         return RX_CONTINUE;
 653 }
 654
 655 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
 656                                             struct tid_ampdu_rx *tid_agg_rx,
 657                                             int index,
 658                                             struct sk_buff_head *frames)
 659 {
 660         struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
 661         struct ieee80211_rx_status *status;
 662
 663         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 664
 665         if (!skb)
 666                 goto no_frame;
 667
 668         /* release the frame from the reorder ring buffer */
 669         tid_agg_rx->stored_mpdu_num--;
 670         tid_agg_rx->reorder_buf[index] = NULL;
 671         status = IEEE80211_SKB_RXCB(skb);
 672         status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
 673         __skb_queue_tail(frames, skb);
 674
 675 no_frame:
 676         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 677 }
 678
 679 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
 680                                              struct tid_ampdu_rx *tid_agg_rx,
 681                                              u16 head_seq_num,
 682                                              struct sk_buff_head *frames)
 683 {
 684         int index;
 685
 686         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 687
 688         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
 689                 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
 690                                          tid_agg_rx->ssn) %
 691                                                         tid_agg_rx->buf_size;
 692                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 693                                                 frames);
 694         }
 695 }
 696
 697 /*
 698  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
 699  * the skb was added to the buffer longer than this time ago, the earlier
 700  * frames that have not yet been received are assumed to be lost and the skb
 701  * can be released for processing. This may also release other skb's from the
 702  * reorder buffer if there are no additional gaps between the frames.
 703  *
 704  * Callers must hold tid_agg_rx->reorder_lock.
 705  */
 706 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
 707
 708 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
 709                                           struct tid_ampdu_rx *tid_agg_rx,
 710                                           struct sk_buff_head *frames)
 711 {
 712         int index, j;
 713
 714         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 715
 716         /* release the buffer until next missing frame */
 717         index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
 718                                  tid_agg_rx->ssn) % tid_agg_rx->buf_size;
 719         if (!tid_agg_rx->reorder_buf[index] &&
 720             tid_agg_rx->stored_mpdu_num) {
 721                 /*
 722                  * No buffers ready to be released, but check whether any
 723                  * frames in the reorder buffer have timed out.
 724                  */
 725                 int skipped = 1;
 726                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
 727                      j = (j + 1) % tid_agg_rx->buf_size) {
 728                         if (!tid_agg_rx->reorder_buf[j]) {
 729                                 skipped++;
 730                                 continue;
 731                         }
 732                         if (skipped &&
 733                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
 734                                         HT_RX_REORDER_BUF_TIMEOUT))
 735                                 goto set_release_timer;
 736
 737                         ht_dbg_ratelimited(sdata,
 738                                            "release an RX reorder frame due to timeout on earlier frames\n");
 739                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
 740                                                         frames);
 741
 742                         /*
 743                          * Increment the head seq# also for the skipped slots.
 744                          */
 745                         tid_agg_rx->head_seq_num =
 746                                 (tid_agg_rx->head_seq_num +
 747                                  skipped) & IEEE80211_SN_MASK;
 748                         skipped = 0;
 749                 }
 750         } else while (tid_agg_rx->reorder_buf[index]) {
 751                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 752                                                 frames);
 753                 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
 754                                          tid_agg_rx->ssn) %
 755                                                         tid_agg_rx->buf_size;
 756         }
 757
 758         if (tid_agg_rx->stored_mpdu_num) {
 759                 j = index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
 760                                              tid_agg_rx->ssn) %
 761                                                         tid_agg_rx->buf_size;
 762
 763                 for (; j != (index - 1) % tid_agg_rx->buf_size;
 764                      j = (j + 1) % tid_agg_rx->buf_size) {
 765                         if (tid_agg_rx->reorder_buf[j])
 766                                 break;
 767                 }
 768
 769  set_release_timer:
 770
 771                 mod_timer(&tid_agg_rx->reorder_timer,
 772                           tid_agg_rx->reorder_time[j] + 1 +
 773                           HT_RX_REORDER_BUF_TIMEOUT);
 774         } else {
 775                 del_timer(&tid_agg_rx->reorder_timer);
 776         }
 777 }
 778
 779 /*
 780  * As this function belongs to the RX path it must be under
 781  * rcu_read_lock protection. It returns false if the frame
 782  * can be processed immediately, true if it was consumed.
 783  */
 784 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
 785                                              struct tid_ampdu_rx *tid_agg_rx,
 786                                              struct sk_buff *skb,
 787                                              struct sk_buff_head *frames)
 788 {
 789         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 790         u16 sc = le16_to_cpu(hdr->seq_ctrl);
 791         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
 792         u16 head_seq_num, buf_size;
 793         int index;
 794         bool ret = true;
 795
 796         spin_lock(&tid_agg_rx->reorder_lock);
 797
 798         buf_size = tid_agg_rx->buf_size;
 799         head_seq_num = tid_agg_rx->head_seq_num;
 800
 801         /* frame with out of date sequence number */
 802         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
 803                 dev_kfree_skb(skb);
 804                 goto out;
 805         }
 806
 807         /*
 808          * If frame the sequence number exceeds our buffering window
 809          * size release some previous frames to make room for this one.
 810          */
 811         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
 812                 head_seq_num = ieee80211_sn_inc(
 813                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
 814                 /* release stored frames up to new head to stack */
 815                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
 816                                                  head_seq_num, frames);
 817         }
 818
 819         /* Now the new frame is always in the range of the reordering buffer */
 820
 821         index = ieee80211_sn_sub(mpdu_seq_num,
 822                                  tid_agg_rx->ssn) % tid_agg_rx->buf_size;
 823
 824         /* check if we already stored this frame */
 825         if (tid_agg_rx->reorder_buf[index]) {
 826                 dev_kfree_skb(skb);
 827                 goto out;
 828         }
 829
 830         /*
 831          * If the current MPDU is in the right order and nothing else
 832          * is stored we can process it directly, no need to buffer it.
 833          * If it is first but there's something stored, we may be able
 834          * to release frames after this one.
 835          */
 836         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
 837             tid_agg_rx->stored_mpdu_num == 0) {
 838                 tid_agg_rx->head_seq_num =
 839                         ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 840                 ret = false;
 841                 goto out;
 842         }
 843
 844         /* put the frame in the reordering buffer */
 845         tid_agg_rx->reorder_buf[index] = skb;
 846         tid_agg_rx->reorder_time[index] = jiffies;
 847         tid_agg_rx->stored_mpdu_num++;
 848         ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
 849
 850  out:
 851         spin_unlock(&tid_agg_rx->reorder_lock);
 852         return ret;
 853 }
 854
 855 /*
 856  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
 857  * true if the MPDU was buffered, false if it should be processed.
 858  */
 859 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
 860                                        struct sk_buff_head *frames)
 861 {
 862         struct sk_buff *skb = rx->skb;
 863         struct ieee80211_local *local = rx->local;
 864         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 865         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 866         struct sta_info *sta = rx->sta;
 867         struct tid_ampdu_rx *tid_agg_rx;
 868         u16 sc;
 869         u8 tid, ack_policy;
 870
 871         if (!ieee80211_is_data_qos(hdr->frame_control))
 872                 goto dont_reorder;
 873
 874         /*
 875          * filter the QoS data rx stream according to
 876          * STA/TID and check if this STA/TID is on aggregation
 877          */
 878
 879         if (!sta)
 880                 goto dont_reorder;
 881
 882         ack_policy = *ieee80211_get_qos_ctl(hdr) &
 883                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
 884         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
 885
 886         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
 887         if (!tid_agg_rx)
 888                 goto dont_reorder;
 889
 890         /* qos null data frames are excluded */
 891         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
 892                 goto dont_reorder;
 893
 894         /* not part of a BA session */
 895         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
 896             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
 897                 goto dont_reorder;
 898
 899         /* not actually part of this BA session */
 900         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
 901                 goto dont_reorder;
 902
 903         /* new, potentially un-ordered, ampdu frame - process it */
 904
 905         /* reset session timer */
 906         if (tid_agg_rx->timeout)
 907                 tid_agg_rx->last_rx = jiffies;
 908
 909         /* if this mpdu is fragmented - terminate rx aggregation session */
 910         sc = le16_to_cpu(hdr->seq_ctrl);
 911         if (sc & IEEE80211_SCTL_FRAG) {
 912                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
 913                 skb_queue_tail(&rx->sdata->skb_queue, skb);
 914                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
 915                 return;
 916         }
 917
 918         /*
 919          * No locking needed -- we will only ever process one
 920          * RX packet at a time, and thus own tid_agg_rx. All
 921          * other code manipulating it needs to (and does) make
 922          * sure that we cannot get to it any more before doing
 923          * anything with it.
 924          */
 925         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
 926                                              frames))
 927                 return;
 928
 929  dont_reorder:
 930         __skb_queue_tail(frames, skb);
 931 }
 932
 933 static ieee80211_rx_result debug_noinline
 934 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
 935 {
 936         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 937         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 938
 939         /*
 940          * Drop duplicate 802.11 retransmissions
 941          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
 942          */
 943         if (rx->skb->len >= 24 && rx->sta &&
 944             !ieee80211_is_ctl(hdr->frame_control) &&
 945             !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
 946             !is_multicast_ether_addr(hdr->addr1)) {
 947                 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
 948                              rx->sta->last_seq_ctrl[rx->seqno_idx] ==
 949                              hdr->seq_ctrl)) {
 950                         if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
 951                                 rx->local->dot11FrameDuplicateCount++;
 952                                 rx->sta->num_duplicates++;
 953                         }
 954                         return RX_DROP_UNUSABLE;
 955                 } else
 956                         rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
 957         }
 958
 959         if (unlikely(rx->skb->len < 16)) {
 960                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
 961                 return RX_DROP_MONITOR;
 962         }
 963
 964         /* Drop disallowed frame classes based on STA auth/assoc state;
 965          * IEEE 802.11, Chap 5.5.
 966          *
 967          * mac80211 filters only based on association state, i.e. it drops
 968          * Class 3 frames from not associated stations. hostapd sends
 969          * deauth/disassoc frames when needed. In addition, hostapd is
 970          * responsible for filtering on both auth and assoc states.
 971          */
 972
 973         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
 974                 return ieee80211_rx_mesh_check(rx);
 975
 976         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
 977                       ieee80211_is_pspoll(hdr->frame_control)) &&
 978                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
 979                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
 980                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
 981                 /*
 982                  * accept port control frames from the AP even when it's not
 983                  * yet marked ASSOC to prevent a race where we don't set the
 984                  * assoc bit quickly enough before it sends the first frame
 985                  */
 986                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
 987                     ieee80211_is_data_present(hdr->frame_control)) {
 988                         unsigned int hdrlen;
 989                         __be16 ethertype;
 990
 991                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 992
 993                         if (rx->skb->len < hdrlen + 8)
 994                                 return RX_DROP_MONITOR;
 995
 996                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
 997                         if (ethertype == rx->sdata->control_port_protocol)
 998                                 return RX_CONTINUE;
 999                 }
1000
1001                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1002                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1003                                                hdr->addr2,
1004                                                GFP_ATOMIC))
1005                         return RX_DROP_UNUSABLE;
1006
1007                 return RX_DROP_MONITOR;
1008         }
1009
1010         return RX_CONTINUE;
1011 }
1012
1013
1014 static ieee80211_rx_result debug_noinline
1015 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1016 {
1017         struct sk_buff *skb = rx->skb;
1018         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1019         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1020         int keyidx;
1021         int hdrlen;
1022         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1023         struct ieee80211_key *sta_ptk = NULL;
1024         int mmie_keyidx = -1;
1025         __le16 fc;
1026
1027         /*
1028          * Key selection 101
1029          *
1030          * There are four types of keys:
1031          *  - GTK (group keys)
1032          *  - IGTK (group keys for management frames)
1033          *  - PTK (pairwise keys)
1034          *  - STK (station-to-station pairwise keys)
1035          *
1036          * When selecting a key, we have to distinguish between multicast
1037          * (including broadcast) and unicast frames, the latter can only
1038          * use PTKs and STKs while the former always use GTKs and IGTKs.
1039          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1040          * unicast frames can also use key indices like GTKs. Hence, if we
1041          * don't have a PTK/STK we check the key index for a WEP key.
1042          *
1043          * Note that in a regular BSS, multicast frames are sent by the
1044          * AP only, associated stations unicast the frame to the AP first
1045          * which then multicasts it on their behalf.
1046          *
1047          * There is also a slight problem in IBSS mode: GTKs are negotiated
1048          * with each station, that is something we don't currently handle.
1049          * The spec seems to expect that one negotiates the same key with
1050          * every station but there's no such requirement; VLANs could be
1051          * possible.
1052          */
1053
1054         /*
1055          * No point in finding a key and decrypting if the frame is neither
1056          * addressed to us nor a multicast frame.
1057          */
1058         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1059                 return RX_CONTINUE;
1060
1061         /* start without a key */
1062         rx->key = NULL;
1063
1064         if (rx->sta)
1065                 sta_ptk = rcu_dereference(rx->sta->ptk);
1066
1067         fc = hdr->frame_control;
1068
1069         if (!ieee80211_has_protected(fc))
1070                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1071
1072         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1073                 rx->key = sta_ptk;
1074                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1075                     (status->flag & RX_FLAG_IV_STRIPPED))
1076                         return RX_CONTINUE;
1077                 /* Skip decryption if the frame is not protected. */
1078                 if (!ieee80211_has_protected(fc))
1079                         return RX_CONTINUE;
1080         } else if (mmie_keyidx >= 0) {
1081                 /* Broadcast/multicast robust management frame / BIP */
1082                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1083                     (status->flag & RX_FLAG_IV_STRIPPED))
1084                         return RX_CONTINUE;
1085
1086                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1087                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1088                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1089                 if (rx->sta)
1090                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1091                 if (!rx->key)
1092                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1093         } else if (!ieee80211_has_protected(fc)) {
1094                 /*
1095                  * The frame was not protected, so skip decryption. However, we
1096                  * need to set rx->key if there is a key that could have been
1097                  * used so that the frame may be dropped if encryption would
1098                  * have been expected.
1099                  */
1100                 struct ieee80211_key *key = NULL;
1101                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1102                 int i;
1103
1104                 if (ieee80211_is_mgmt(fc) &&
1105                     is_multicast_ether_addr(hdr->addr1) &&
1106                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1107                         rx->key = key;
1108                 else {
1109                         if (rx->sta) {
1110                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1111                                         key = rcu_dereference(rx->sta->gtk[i]);
1112                                         if (key)
1113                                                 break;
1114                                 }
1115                         }
1116                         if (!key) {
1117                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1118                                         key = rcu_dereference(sdata->keys[i]);
1119                                         if (key)
1120                                                 break;
1121                                 }
1122                         }
1123                         if (key)
1124                                 rx->key = key;
1125                 }
1126                 return RX_CONTINUE;
1127         } else {
1128                 u8 keyid;
1129                 /*
1130                  * The device doesn't give us the IV so we won't be
1131                  * able to look up the key. That's ok though, we
1132                  * don't need to decrypt the frame, we just won't
1133                  * be able to keep statistics accurate.
1134                  * Except for key threshold notifications, should
1135                  * we somehow allow the driver to tell us which key
1136                  * the hardware used if this flag is set?
1137                  */
1138                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1139                     (status->flag & RX_FLAG_IV_STRIPPED))
1140                         return RX_CONTINUE;
1141
1142                 hdrlen = ieee80211_hdrlen(fc);
1143
1144                 if (rx->skb->len < 8 + hdrlen)
1145                         return RX_DROP_UNUSABLE; /* TODO: count this? */
1146
1147                 /*
1148                  * no need to call ieee80211_wep_get_keyidx,
1149                  * it verifies a bunch of things we've done already
1150                  */
1151                 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1152                 keyidx = keyid >> 6;
1153
1154                 /* check per-station GTK first, if multicast packet */
1155                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1156                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1157
1158                 /* if not found, try default key */
1159                 if (!rx->key) {
1160                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1161
1162                         /*
1163                          * RSNA-protected unicast frames should always be
1164                          * sent with pairwise or station-to-station keys,
1165                          * but for WEP we allow using a key index as well.
1166                          */
1167                         if (rx->key &&
1168                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1169                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1170                             !is_multicast_ether_addr(hdr->addr1))
1171                                 rx->key = NULL;
1172                 }
1173         }
1174
1175         if (rx->key) {
1176                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1177                         return RX_DROP_MONITOR;
1178
1179                 rx->key->tx_rx_count++;
1180                 /* TODO: add threshold stuff again */
1181         } else {
1182                 return RX_DROP_MONITOR;
1183         }
1184
1185         switch (rx->key->conf.cipher) {
1186         case WLAN_CIPHER_SUITE_WEP40:
1187         case WLAN_CIPHER_SUITE_WEP104:
1188                 result = ieee80211_crypto_wep_decrypt(rx);
1189                 break;
1190         case WLAN_CIPHER_SUITE_TKIP:
1191                 result = ieee80211_crypto_tkip_decrypt(rx);
1192                 break;
1193         case WLAN_CIPHER_SUITE_CCMP:
1194                 result = ieee80211_crypto_ccmp_decrypt(rx);
1195                 break;
1196         case WLAN_CIPHER_SUITE_AES_CMAC:
1197                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1198                 break;
1199         default:
1200                 /*
1201                  * We can reach here only with HW-only algorithms
1202                  * but why didn't it decrypt the frame?!
1203                  */
1204                 return RX_DROP_UNUSABLE;
1205         }
1206
1207         /* the hdr variable is invalid after the decrypt handlers */
1208
1209         /* either the frame has been decrypted or will be dropped */
1210         status->flag |= RX_FLAG_DECRYPTED;
1211
1212         return result;
1213 }
1214
1215 static ieee80211_rx_result debug_noinline
1216 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1217 {
1218         struct ieee80211_local *local;
1219         struct ieee80211_hdr *hdr;
1220         struct sk_buff *skb;
1221
1222         local = rx->local;
1223         skb = rx->skb;
1224         hdr = (struct ieee80211_hdr *) skb->data;
1225
1226         if (!local->pspolling)
1227                 return RX_CONTINUE;
1228
1229         if (!ieee80211_has_fromds(hdr->frame_control))
1230                 /* this is not from AP */
1231                 return RX_CONTINUE;
1232
1233         if (!ieee80211_is_data(hdr->frame_control))
1234                 return RX_CONTINUE;
1235
1236         if (!ieee80211_has_moredata(hdr->frame_control)) {
1237                 /* AP has no more frames buffered for us */
1238                 local->pspolling = false;
1239                 return RX_CONTINUE;
1240         }
1241
1242         /* more data bit is set, let's request a new frame from the AP */
1243         ieee80211_send_pspoll(local, rx->sdata);
1244
1245         return RX_CONTINUE;
1246 }
1247
1248 static void sta_ps_start(struct sta_info *sta)
1249 {
1250         struct ieee80211_sub_if_data *sdata = sta->sdata;
1251         struct ieee80211_local *local = sdata->local;
1252         struct ps_data *ps;
1253
1254         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1255             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1256                 ps = &sdata->bss->ps;
1257         else
1258                 return;
1259
1260         atomic_inc(&ps->num_sta_ps);
1261         set_sta_flag(sta, WLAN_STA_PS_STA);
1262         if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1263                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1264         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1265                sta->sta.addr, sta->sta.aid);
1266 }
1267
1268 static void sta_ps_end(struct sta_info *sta)
1269 {
1270         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1271                sta->sta.addr, sta->sta.aid);
1272
1273         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1274                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1275                        sta->sta.addr, sta->sta.aid);
1276                 return;
1277         }
1278
1279         ieee80211_sta_ps_deliver_wakeup(sta);
1280 }
1281
1282 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1283 {
1284         struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1285         bool in_ps;
1286
1287         WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1288
1289         /* Don't let the same PS state be set twice */
1290         in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1291         if ((start && in_ps) || (!start && !in_ps))
1292                 return -EINVAL;
1293
1294         if (start)
1295                 sta_ps_start(sta_inf);
1296         else
1297                 sta_ps_end(sta_inf);
1298
1299         return 0;
1300 }
1301 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1302
1303 static ieee80211_rx_result debug_noinline
1304 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1305 {
1306         struct ieee80211_sub_if_data *sdata = rx->sdata;
1307         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1308         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1309         int tid, ac;
1310
1311         if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1312                 return RX_CONTINUE;
1313
1314         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1315             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1316                 return RX_CONTINUE;
1317
1318         /*
1319          * The device handles station powersave, so don't do anything about
1320          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1321          * it to mac80211 since they're handled.)
1322          */
1323         if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1324                 return RX_CONTINUE;
1325
1326         /*
1327          * Don't do anything if the station isn't already asleep. In
1328          * the uAPSD case, the station will probably be marked asleep,
1329          * in the PS-Poll case the station must be confused ...
1330          */
1331         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1332                 return RX_CONTINUE;
1333
1334         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1335                 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1336                         if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1337                                 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1338                         else
1339                                 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1340                 }
1341
1342                 /* Free PS Poll skb here instead of returning RX_DROP that would
1343                  * count as an dropped frame. */
1344                 dev_kfree_skb(rx->skb);
1345
1346                 return RX_QUEUED;
1347         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1348                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1349                    ieee80211_has_pm(hdr->frame_control) &&
1350                    (ieee80211_is_data_qos(hdr->frame_control) ||
1351                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1352                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1353                 ac = ieee802_1d_to_ac[tid & 7];
1354
1355                 /*
1356                  * If this AC is not trigger-enabled do nothing.
1357                  *
1358                  * NB: This could/should check a separate bitmap of trigger-
1359                  * enabled queues, but for now we only implement uAPSD w/o
1360                  * TSPEC changes to the ACs, so they're always the same.
1361                  */
1362                 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1363                         return RX_CONTINUE;
1364
1365                 /* if we are in a service period, do nothing */
1366                 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1367                         return RX_CONTINUE;
1368
1369                 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1370                         ieee80211_sta_ps_deliver_uapsd(rx->sta);
1371                 else
1372                         set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1373         }
1374
1375         return RX_CONTINUE;
1376 }
1377
1378 static ieee80211_rx_result debug_noinline
1379 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1380 {
1381         struct sta_info *sta = rx->sta;
1382         struct sk_buff *skb = rx->skb;
1383         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1384         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1385         int i;
1386
1387         if (!sta)
1388                 return RX_CONTINUE;
1389
1390         /*
1391          * Update last_rx only for IBSS packets which are for the current
1392          * BSSID and for station already AUTHORIZED to avoid keeping the
1393          * current IBSS network alive in cases where other STAs start
1394          * using different BSSID. This will also give the station another
1395          * chance to restart the authentication/authorization in case
1396          * something went wrong the first time.
1397          */
1398         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1399                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1400                                                 NL80211_IFTYPE_ADHOC);
1401                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1402                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1403                         sta->last_rx = jiffies;
1404                         if (ieee80211_is_data(hdr->frame_control)) {
1405                                 sta->last_rx_rate_idx = status->rate_idx;
1406                                 sta->last_rx_rate_flag = status->flag;
1407                                 sta->last_rx_rate_vht_nss = status->vht_nss;
1408                         }
1409                 }
1410         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1411                 /*
1412                  * Mesh beacons will update last_rx when if they are found to
1413                  * match the current local configuration when processed.
1414                  */
1415                 sta->last_rx = jiffies;
1416                 if (ieee80211_is_data(hdr->frame_control)) {
1417                         sta->last_rx_rate_idx = status->rate_idx;
1418                         sta->last_rx_rate_flag = status->flag;
1419                         sta->last_rx_rate_vht_nss = status->vht_nss;
1420                 }
1421         }
1422
1423         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1424                 return RX_CONTINUE;
1425
1426         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1427                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1428
1429         sta->rx_fragments++;
1430         sta->rx_bytes += rx->skb->len;
1431         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1432                 sta->last_signal = status->signal;
1433                 ewma_add(&sta->avg_signal, -status->signal);
1434         }
1435
1436         if (status->chains) {
1437                 sta->chains = status->chains;
1438                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1439                         int signal = status->chain_signal[i];
1440
1441                         if (!(status->chains & BIT(i)))
1442                                 continue;
1443
1444                         sta->chain_signal_last[i] = signal;
1445                         ewma_add(&sta->chain_signal_avg[i], -signal);
1446                 }
1447         }
1448
1449         /*
1450          * Change STA power saving mode only at the end of a frame
1451          * exchange sequence.
1452          */
1453         if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1454             !ieee80211_has_morefrags(hdr->frame_control) &&
1455             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1456             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1457              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1458                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1459                         /*
1460                          * Ignore doze->wake transitions that are
1461                          * indicated by non-data frames, the standard
1462                          * is unclear here, but for example going to
1463                          * PS mode and then scanning would cause a
1464                          * doze->wake transition for the probe request,
1465                          * and that is clearly undesirable.
1466                          */
1467                         if (ieee80211_is_data(hdr->frame_control) &&
1468                             !ieee80211_has_pm(hdr->frame_control))
1469                                 sta_ps_end(sta);
1470                 } else {
1471                         if (ieee80211_has_pm(hdr->frame_control))
1472                                 sta_ps_start(sta);
1473                 }
1474         }
1475
1476         /* mesh power save support */
1477         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1478                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1479
1480         /*
1481          * Drop (qos-)data::nullfunc frames silently, since they
1482          * are used only to control station power saving mode.
1483          */
1484         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1485             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1486                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1487
1488                 /*
1489                  * If we receive a 4-addr nullfunc frame from a STA
1490                  * that was not moved to a 4-addr STA vlan yet send
1491                  * the event to userspace and for older hostapd drop
1492                  * the frame to the monitor interface.
1493                  */
1494                 if (ieee80211_has_a4(hdr->frame_control) &&
1495                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1496                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1497                       !rx->sdata->u.vlan.sta))) {
1498                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1499                                 cfg80211_rx_unexpected_4addr_frame(
1500                                         rx->sdata->dev, sta->sta.addr,
1501                                         GFP_ATOMIC);
1502                         return RX_DROP_MONITOR;
1503                 }
1504                 /*
1505                  * Update counter and free packet here to avoid
1506                  * counting this as a dropped packed.
1507                  */
1508                 sta->rx_packets++;
1509                 dev_kfree_skb(rx->skb);
1510                 return RX_QUEUED;
1511         }
1512
1513         return RX_CONTINUE;
1514 } /* ieee80211_rx_h_sta_process */
1515
1516 static inline struct ieee80211_fragment_entry *
1517 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1518                          unsigned int frag, unsigned int seq, int rx_queue,
1519                          struct sk_buff **skb)
1520 {
1521         struct ieee80211_fragment_entry *entry;
1522
1523         entry = &sdata->fragments[sdata->fragment_next++];
1524         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1525                 sdata->fragment_next = 0;
1526
1527         if (!skb_queue_empty(&entry->skb_list))
1528                 __skb_queue_purge(&entry->skb_list);
1529
1530         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1531         *skb = NULL;
1532         entry->first_frag_time = jiffies;
1533         entry->seq = seq;
1534         entry->rx_queue = rx_queue;
1535         entry->last_frag = frag;
1536         entry->ccmp = 0;
1537         entry->extra_len = 0;
1538
1539         return entry;
1540 }
1541
1542 static inline struct ieee80211_fragment_entry *
1543 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1544                           unsigned int frag, unsigned int seq,
1545                           int rx_queue, struct ieee80211_hdr *hdr)
1546 {
1547         struct ieee80211_fragment_entry *entry;
1548         int i, idx;
1549
1550         idx = sdata->fragment_next;
1551         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1552                 struct ieee80211_hdr *f_hdr;
1553
1554                 idx--;
1555                 if (idx < 0)
1556                         idx = IEEE80211_FRAGMENT_MAX - 1;
1557
1558                 entry = &sdata->fragments[idx];
1559                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1560                     entry->rx_queue != rx_queue ||
1561                     entry->last_frag + 1 != frag)
1562                         continue;
1563
1564                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1565
1566                 /*
1567                  * Check ftype and addresses are equal, else check next fragment
1568                  */
1569                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1570                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1571                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1572                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1573                         continue;
1574
1575                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1576                         __skb_queue_purge(&entry->skb_list);
1577                         continue;
1578                 }
1579                 return entry;
1580         }
1581
1582         return NULL;
1583 }
1584
1585 static ieee80211_rx_result debug_noinline
1586 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1587 {
1588         struct ieee80211_hdr *hdr;
1589         u16 sc;
1590         __le16 fc;
1591         unsigned int frag, seq;
1592         struct ieee80211_fragment_entry *entry;
1593         struct sk_buff *skb;
1594         struct ieee80211_rx_status *status;
1595
1596         hdr = (struct ieee80211_hdr *)rx->skb->data;
1597         fc = hdr->frame_control;
1598
1599         if (ieee80211_is_ctl(fc))
1600                 return RX_CONTINUE;
1601
1602         sc = le16_to_cpu(hdr->seq_ctrl);
1603         frag = sc & IEEE80211_SCTL_FRAG;
1604
1605         if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1606                    is_multicast_ether_addr(hdr->addr1))) {
1607                 /* not fragmented */
1608                 goto out;
1609         }
1610         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1611
1612         if (skb_linearize(rx->skb))
1613                 return RX_DROP_UNUSABLE;
1614
1615         /*
1616          *  skb_linearize() might change the skb->data and
1617          *  previously cached variables (in this case, hdr) need to
1618          *  be refreshed with the new data.
1619          */
1620         hdr = (struct ieee80211_hdr *)rx->skb->data;
1621         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1622
1623         if (frag == 0) {
1624                 /* This is the first fragment of a new frame. */
1625                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1626                                                  rx->seqno_idx, &(rx->skb));
1627                 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1628                     ieee80211_has_protected(fc)) {
1629                         int queue = rx->security_idx;
1630                         /* Store CCMP PN so that we can verify that the next
1631                          * fragment has a sequential PN value. */
1632                         entry->ccmp = 1;
1633                         memcpy(entry->last_pn,
1634                                rx->key->u.ccmp.rx_pn[queue],
1635                                IEEE80211_CCMP_PN_LEN);
1636                 }
1637                 return RX_QUEUED;
1638         }
1639
1640         /* This is a fragment for a frame that should already be pending in
1641          * fragment cache. Add this fragment to the end of the pending entry.
1642          */
1643         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1644                                           rx->seqno_idx, hdr);
1645         if (!entry) {
1646                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1647                 return RX_DROP_MONITOR;
1648         }
1649
1650         /* Verify that MPDUs within one MSDU have sequential PN values.
1651          * (IEEE 802.11i, 8.3.3.4.5) */
1652         if (entry->ccmp) {
1653                 int i;
1654                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1655                 int queue;
1656                 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1657                         return RX_DROP_UNUSABLE;
1658                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1659                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1660                         pn[i]++;
1661                         if (pn[i])
1662                                 break;
1663                 }
1664                 queue = rx->security_idx;
1665                 rpn = rx->key->u.ccmp.rx_pn[queue];
1666                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1667                         return RX_DROP_UNUSABLE;
1668                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1669         }
1670
1671         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1672         __skb_queue_tail(&entry->skb_list, rx->skb);
1673         entry->last_frag = frag;
1674         entry->extra_len += rx->skb->len;
1675         if (ieee80211_has_morefrags(fc)) {
1676                 rx->skb = NULL;
1677                 return RX_QUEUED;
1678         }
1679
1680         rx->skb = __skb_dequeue(&entry->skb_list);
1681         if (skb_tailroom(rx->skb) < entry->extra_len) {
1682                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1683                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1684                                               GFP_ATOMIC))) {
1685                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1686                         __skb_queue_purge(&entry->skb_list);
1687                         return RX_DROP_UNUSABLE;
1688                 }
1689         }
1690         while ((skb = __skb_dequeue(&entry->skb_list))) {
1691                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1692                 dev_kfree_skb(skb);
1693         }
1694
1695         /* Complete frame has been reassembled - process it now */
1696         status = IEEE80211_SKB_RXCB(rx->skb);
1697         status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1698
1699  out:
1700         if (rx->sta)
1701                 rx->sta->rx_packets++;
1702         if (is_multicast_ether_addr(hdr->addr1))
1703                 rx->local->dot11MulticastReceivedFrameCount++;
1704         else
1705                 ieee80211_led_rx(rx->local);
1706         return RX_CONTINUE;
1707 }
1708
1709 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1710 {
1711         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1712                 return -EACCES;
1713
1714         return 0;
1715 }
1716
1717 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1718 {
1719         struct sk_buff *skb = rx->skb;
1720         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1721
1722         /*
1723          * Pass through unencrypted frames if the hardware has
1724          * decrypted them already.
1725          */
1726         if (status->flag & RX_FLAG_DECRYPTED)
1727                 return 0;
1728
1729         /* Drop unencrypted frames if key is set. */
1730         if (unlikely(!ieee80211_has_protected(fc) &&
1731                      !ieee80211_is_nullfunc(fc) &&
1732                      ieee80211_is_data(fc) &&
1733                      (rx->key || rx->sdata->drop_unencrypted)))
1734                 return -EACCES;
1735
1736         return 0;
1737 }
1738
1739 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1740 {
1741         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1742         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1743         __le16 fc = hdr->frame_control;
1744
1745         /*
1746          * Pass through unencrypted frames if the hardware has
1747          * decrypted them already.
1748          */
1749         if (status->flag & RX_FLAG_DECRYPTED)
1750                 return 0;
1751
1752         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1753                 if (unlikely(!ieee80211_has_protected(fc) &&
1754                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1755                              rx->key)) {
1756                         if (ieee80211_is_deauth(fc) ||
1757                             ieee80211_is_disassoc(fc))
1758                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1759                                                              rx->skb->data,
1760                                                              rx->skb->len);
1761                         return -EACCES;
1762                 }
1763                 /* BIP does not use Protected field, so need to check MMIE */
1764                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1765                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1766                         if (ieee80211_is_deauth(fc) ||
1767                             ieee80211_is_disassoc(fc))
1768                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1769                                                              rx->skb->data,
1770                                                              rx->skb->len);
1771                         return -EACCES;
1772                 }
1773                 /*
1774                  * When using MFP, Action frames are not allowed prior to
1775                  * having configured keys.
1776                  */
1777                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1778                              ieee80211_is_robust_mgmt_frame(
1779                                      (struct ieee80211_hdr *) rx->skb->data)))
1780                         return -EACCES;
1781         }
1782
1783         return 0;
1784 }
1785
1786 static int
1787 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1788 {
1789         struct ieee80211_sub_if_data *sdata = rx->sdata;
1790         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1791         bool check_port_control = false;
1792         struct ethhdr *ehdr;
1793         int ret;
1794
1795         *port_control = false;
1796         if (ieee80211_has_a4(hdr->frame_control) &&
1797             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1798                 return -1;
1799
1800         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1801             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1802
1803                 if (!sdata->u.mgd.use_4addr)
1804                         return -1;
1805                 else
1806                         check_port_control = true;
1807         }
1808
1809         if (is_multicast_ether_addr(hdr->addr1) &&
1810             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1811                 return -1;
1812
1813         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1814         if (ret < 0)
1815                 return ret;
1816
1817         ehdr = (struct ethhdr *) rx->skb->data;
1818         if (ehdr->h_proto == rx->sdata->control_port_protocol)
1819                 *port_control = true;
1820         else if (check_port_control)
1821                 return -1;
1822
1823         return 0;
1824 }
1825
1826 /*
1827  * requires that rx->skb is a frame with ethernet header
1828  */
1829 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1830 {
1831         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1832                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1833         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1834
1835         /*
1836          * Allow EAPOL frames to us/the PAE group address regardless
1837          * of whether the frame was encrypted or not.
1838          */
1839         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1840             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1841              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
1842                 return true;
1843
1844         if (ieee80211_802_1x_port_control(rx) ||
1845             ieee80211_drop_unencrypted(rx, fc))
1846                 return false;
1847
1848         return true;
1849 }
1850
1851 /*
1852  * requires that rx->skb is a frame with ethernet header
1853  */
1854 static void
1855 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1856 {
1857         struct ieee80211_sub_if_data *sdata = rx->sdata;
1858         struct net_device *dev = sdata->dev;
1859         struct sk_buff *skb, *xmit_skb;
1860         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1861         struct sta_info *dsta;
1862         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1863
1864         skb = rx->skb;
1865         xmit_skb = NULL;
1866
1867         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1868              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1869             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1870             (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1871             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1872                 if (is_multicast_ether_addr(ehdr->h_dest)) {
1873                         /*
1874                          * send multicast frames both to higher layers in
1875                          * local net stack and back to the wireless medium
1876                          */
1877                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
1878                         if (!xmit_skb)
1879                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
1880                                                     dev->name);
1881                 } else {
1882                         dsta = sta_info_get(sdata, skb->data);
1883                         if (dsta) {
1884                                 /*
1885                                  * The destination station is associated to
1886                                  * this AP (in this VLAN), so send the frame
1887                                  * directly to it and do not pass it to local
1888                                  * net stack.
1889                                  */
1890                                 xmit_skb = skb;
1891                                 skb = NULL;
1892                         }
1893                 }
1894         }
1895
1896         if (skb) {
1897                 int align __maybe_unused;
1898
1899 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1900                 /*
1901                  * 'align' will only take the values 0 or 2 here
1902                  * since all frames are required to be aligned
1903                  * to 2-byte boundaries when being passed to
1904                  * mac80211; the code here works just as well if
1905                  * that isn't true, but mac80211 assumes it can
1906                  * access fields as 2-byte aligned (e.g. for
1907                  * compare_ether_addr)
1908                  */
1909                 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1910                 if (align) {
1911                         if (WARN_ON(skb_headroom(skb) < 3)) {
1912                                 dev_kfree_skb(skb);
1913                                 skb = NULL;
1914                         } else {
1915                                 u8 *data = skb->data;
1916                                 size_t len = skb_headlen(skb);
1917                                 skb->data -= align;
1918                                 memmove(skb->data, data, len);
1919                                 skb_set_tail_pointer(skb, len);
1920                         }
1921                 }
1922 #endif
1923
1924                 if (skb) {
1925                         /* deliver to local stack */
1926                         skb->protocol = eth_type_trans(skb, dev);
1927                         memset(skb->cb, 0, sizeof(skb->cb));
1928                         netif_receive_skb(skb);
1929                 }
1930         }
1931
1932         if (xmit_skb) {
1933                 /*
1934                  * Send to wireless media and increase priority by 256 to
1935                  * keep the received priority instead of reclassifying
1936                  * the frame (see cfg80211_classify8021d).
1937                  */
1938                 xmit_skb->priority += 256;
1939                 xmit_skb->protocol = htons(ETH_P_802_3);
1940                 skb_reset_network_header(xmit_skb);
1941                 skb_reset_mac_header(xmit_skb);
1942                 dev_queue_xmit(xmit_skb);
1943         }
1944 }
1945
1946 static ieee80211_rx_result debug_noinline
1947 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1948 {
1949         struct net_device *dev = rx->sdata->dev;
1950         struct sk_buff *skb = rx->skb;
1951         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1952         __le16 fc = hdr->frame_control;
1953         struct sk_buff_head frame_list;
1954         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1955
1956         if (unlikely(!ieee80211_is_data(fc)))
1957                 return RX_CONTINUE;
1958
1959         if (unlikely(!ieee80211_is_data_present(fc)))
1960                 return RX_DROP_MONITOR;
1961
1962         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1963                 return RX_CONTINUE;
1964
1965         if (ieee80211_has_a4(hdr->frame_control) &&
1966             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1967             !rx->sdata->u.vlan.sta)
1968                 return RX_DROP_UNUSABLE;
1969
1970         if (is_multicast_ether_addr(hdr->addr1) &&
1971             ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1972               rx->sdata->u.vlan.sta) ||
1973              (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1974               rx->sdata->u.mgd.use_4addr)))
1975                 return RX_DROP_UNUSABLE;
1976
1977         skb->dev = dev;
1978         __skb_queue_head_init(&frame_list);
1979
1980         if (skb_linearize(skb))
1981                 return RX_DROP_UNUSABLE;
1982
1983         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1984                                  rx->sdata->vif.type,
1985                                  rx->local->hw.extra_tx_headroom, true);
1986
1987         while (!skb_queue_empty(&frame_list)) {
1988                 rx->skb = __skb_dequeue(&frame_list);
1989
1990                 if (!ieee80211_frame_allowed(rx, fc)) {
1991                         dev_kfree_skb(rx->skb);
1992                         continue;
1993                 }
1994                 dev->stats.rx_packets++;
1995                 dev->stats.rx_bytes += rx->skb->len;
1996
1997                 ieee80211_deliver_skb(rx);
1998         }
1999
2000         return RX_QUEUED;
2001 }
2002
2003 #ifdef CONFIG_MAC80211_MESH
2004 static ieee80211_rx_result
2005 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2006 {
2007         struct ieee80211_hdr *fwd_hdr, *hdr;
2008         struct ieee80211_tx_info *info;
2009         struct ieee80211s_hdr *mesh_hdr;
2010         struct sk_buff *skb = rx->skb, *fwd_skb;
2011         struct ieee80211_local *local = rx->local;
2012         struct ieee80211_sub_if_data *sdata = rx->sdata;
2013         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2014         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2015         __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
2016         u16 q, hdrlen;
2017
2018         hdr = (struct ieee80211_hdr *) skb->data;
2019         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2020
2021         /* make sure fixed part of mesh header is there, also checks skb len */
2022         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2023                 return RX_DROP_MONITOR;
2024
2025         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2026
2027         /* make sure full mesh header is there, also checks skb len */
2028         if (!pskb_may_pull(rx->skb,
2029                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2030                 return RX_DROP_MONITOR;
2031
2032         /* reload pointers */
2033         hdr = (struct ieee80211_hdr *) skb->data;
2034         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2035
2036         /* frame is in RMC, don't forward */
2037         if (ieee80211_is_data(hdr->frame_control) &&
2038             is_multicast_ether_addr(hdr->addr1) &&
2039             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2040                 return RX_DROP_MONITOR;
2041
2042         if (!ieee80211_is_data(hdr->frame_control) ||
2043             !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2044                 return RX_CONTINUE;
2045
2046         if (!mesh_hdr->ttl)
2047                 return RX_DROP_MONITOR;
2048
2049         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2050                 struct mesh_path *mppath;
2051                 char *proxied_addr;
2052                 char *mpp_addr;
2053
2054                 if (is_multicast_ether_addr(hdr->addr1)) {
2055                         mpp_addr = hdr->addr3;
2056                         proxied_addr = mesh_hdr->eaddr1;
2057                 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2058                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2059                         mpp_addr = hdr->addr4;
2060                         proxied_addr = mesh_hdr->eaddr2;
2061                 } else {
2062                         return RX_DROP_MONITOR;
2063                 }
2064
2065                 rcu_read_lock();
2066                 mppath = mpp_path_lookup(sdata, proxied_addr);
2067                 if (!mppath) {
2068                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2069                 } else {
2070                         spin_lock_bh(&mppath->state_lock);
2071                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2072                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2073                         spin_unlock_bh(&mppath->state_lock);
2074                 }
2075                 rcu_read_unlock();
2076         }
2077
2078         /* Frame has reached destination.  Don't forward */
2079         if (!is_multicast_ether_addr(hdr->addr1) &&
2080             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2081                 return RX_CONTINUE;
2082
2083         q = ieee80211_select_queue_80211(sdata, skb, hdr);
2084         if (ieee80211_queue_stopped(&local->hw, q)) {
2085                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2086                 return RX_DROP_MONITOR;
2087         }
2088         skb_set_queue_mapping(skb, q);
2089
2090         if (!--mesh_hdr->ttl) {
2091                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2092                 goto out;
2093         }
2094
2095         if (!ifmsh->mshcfg.dot11MeshForwarding)
2096                 goto out;
2097
2098         fwd_skb = skb_copy(skb, GFP_ATOMIC);
2099         if (!fwd_skb) {
2100                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2101                                     sdata->name);
2102                 goto out;
2103         }
2104
2105         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2106         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2107         info = IEEE80211_SKB_CB(fwd_skb);
2108         memset(info, 0, sizeof(*info));
2109         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2110         info->control.vif = &rx->sdata->vif;
2111         info->control.jiffies = jiffies;
2112         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2113                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2114                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2115                 /* update power mode indication when forwarding */
2116                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2117         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2118                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2119                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2120         } else {
2121                 /* unable to resolve next hop */
2122                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2123                                    fwd_hdr->addr3, 0, reason, fwd_hdr->addr2);
2124                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2125                 kfree_skb(fwd_skb);
2126                 return RX_DROP_MONITOR;
2127         }
2128
2129         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2130         ieee80211_add_pending_skb(local, fwd_skb);
2131  out:
2132         if (is_multicast_ether_addr(hdr->addr1) ||
2133             sdata->dev->flags & IFF_PROMISC)
2134                 return RX_CONTINUE;
2135         else
2136                 return RX_DROP_MONITOR;
2137 }
2138 #endif
2139
2140 static ieee80211_rx_result debug_noinline
2141 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2142 {
2143         struct ieee80211_sub_if_data *sdata = rx->sdata;
2144         struct ieee80211_local *local = rx->local;
2145         struct net_device *dev = sdata->dev;
2146         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2147         __le16 fc = hdr->frame_control;
2148         bool port_control;
2149         int err;
2150
2151         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2152                 return RX_CONTINUE;
2153
2154         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2155                 return RX_DROP_MONITOR;
2156
2157         /*
2158          * Send unexpected-4addr-frame event to hostapd. For older versions,
2159          * also drop the frame to cooked monitor interfaces.
2160          */
2161         if (ieee80211_has_a4(hdr->frame_control) &&
2162             sdata->vif.type == NL80211_IFTYPE_AP) {
2163                 if (rx->sta &&
2164                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2165                         cfg80211_rx_unexpected_4addr_frame(
2166                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2167                 return RX_DROP_MONITOR;
2168         }
2169
2170         err = __ieee80211_data_to_8023(rx, &port_control);
2171         if (unlikely(err))
2172                 return RX_DROP_UNUSABLE;
2173
2174         if (!ieee80211_frame_allowed(rx, fc))
2175                 return RX_DROP_MONITOR;
2176
2177         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2178             unlikely(port_control) && sdata->bss) {
2179                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2180                                      u.ap);
2181                 dev = sdata->dev;
2182                 rx->sdata = sdata;
2183         }
2184
2185         rx->skb->dev = dev;
2186
2187         dev->stats.rx_packets++;
2188         dev->stats.rx_bytes += rx->skb->len;
2189
2190         if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2191             !is_multicast_ether_addr(
2192                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2193             (!local->scanning &&
2194              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2195                         mod_timer(&local->dynamic_ps_timer, jiffies +
2196                          msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2197         }
2198
2199         ieee80211_deliver_skb(rx);
2200
2201         return RX_QUEUED;
2202 }
2203
2204 static ieee80211_rx_result debug_noinline
2205 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2206 {
2207         struct sk_buff *skb = rx->skb;
2208         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2209         struct tid_ampdu_rx *tid_agg_rx;
2210         u16 start_seq_num;
2211         u16 tid;
2212
2213         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2214                 return RX_CONTINUE;
2215
2216         if (ieee80211_is_back_req(bar->frame_control)) {
2217                 struct {
2218                         __le16 control, start_seq_num;
2219                 } __packed bar_data;
2220
2221                 if (!rx->sta)
2222                         return RX_DROP_MONITOR;
2223
2224                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2225                                   &bar_data, sizeof(bar_data)))
2226                         return RX_DROP_MONITOR;
2227
2228                 tid = le16_to_cpu(bar_data.control) >> 12;
2229
2230                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2231                 if (!tid_agg_rx)
2232                         return RX_DROP_MONITOR;
2233
2234                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2235
2236                 /* reset session timer */
2237                 if (tid_agg_rx->timeout)
2238                         mod_timer(&tid_agg_rx->session_timer,
2239                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2240
2241                 spin_lock(&tid_agg_rx->reorder_lock);
2242                 /* release stored frames up to start of BAR */
2243                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2244                                                  start_seq_num, frames);
2245                 spin_unlock(&tid_agg_rx->reorder_lock);
2246
2247                 kfree_skb(skb);
2248                 return RX_QUEUED;
2249         }
2250
2251         /*
2252          * After this point, we only want management frames,
2253          * so we can drop all remaining control frames to
2254          * cooked monitor interfaces.
2255          */
2256         return RX_DROP_MONITOR;
2257 }
2258
2259 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2260                                            struct ieee80211_mgmt *mgmt,
2261                                            size_t len)
2262 {
2263         struct ieee80211_local *local = sdata->local;
2264         struct sk_buff *skb;
2265         struct ieee80211_mgmt *resp;
2266
2267         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2268                 /* Not to own unicast address */
2269                 return;
2270         }
2271
2272         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2273             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2274                 /* Not from the current AP or not associated yet. */
2275                 return;
2276         }
2277
2278         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2279                 /* Too short SA Query request frame */
2280                 return;
2281         }
2282
2283         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2284         if (skb == NULL)
2285                 return;
2286
2287         skb_reserve(skb, local->hw.extra_tx_headroom);
2288         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2289         memset(resp, 0, 24);
2290         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2291         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2292         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2293         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2294                                           IEEE80211_STYPE_ACTION);
2295         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2296         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2297         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2298         memcpy(resp->u.action.u.sa_query.trans_id,
2299                mgmt->u.action.u.sa_query.trans_id,
2300                WLAN_SA_QUERY_TR_ID_LEN);
2301
2302         ieee80211_tx_skb(sdata, skb);
2303 }
2304
2305 static ieee80211_rx_result debug_noinline
2306 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2307 {
2308         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2309         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2310
2311         /*
2312          * From here on, look only at management frames.
2313          * Data and control frames are already handled,
2314          * and unknown (reserved) frames are useless.
2315          */
2316         if (rx->skb->len < 24)
2317                 return RX_DROP_MONITOR;
2318
2319         if (!ieee80211_is_mgmt(mgmt->frame_control))
2320                 return RX_DROP_MONITOR;
2321
2322         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2323             ieee80211_is_beacon(mgmt->frame_control) &&
2324             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2325                 int sig = 0;
2326
2327                 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2328                         sig = status->signal;
2329
2330                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2331                                             rx->skb->data, rx->skb->len,
2332                                             status->freq, sig);
2333                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2334         }
2335
2336         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2337                 return RX_DROP_MONITOR;
2338
2339         if (ieee80211_drop_unencrypted_mgmt(rx))
2340                 return RX_DROP_UNUSABLE;
2341
2342         return RX_CONTINUE;
2343 }
2344
2345 static ieee80211_rx_result debug_noinline
2346 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2347 {
2348         struct ieee80211_local *local = rx->local;
2349         struct ieee80211_sub_if_data *sdata = rx->sdata;
2350         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2351         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2352         int len = rx->skb->len;
2353
2354         if (!ieee80211_is_action(mgmt->frame_control))
2355                 return RX_CONTINUE;
2356
2357         /* drop too small frames */
2358         if (len < IEEE80211_MIN_ACTION_SIZE)
2359                 return RX_DROP_UNUSABLE;
2360
2361         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2362             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED)
2363                 return RX_DROP_UNUSABLE;
2364
2365         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2366                 return RX_DROP_UNUSABLE;
2367
2368         switch (mgmt->u.action.category) {
2369         case WLAN_CATEGORY_HT:
2370                 /* reject HT action frames from stations not supporting HT */
2371                 if (!rx->sta->sta.ht_cap.ht_supported)
2372                         goto invalid;
2373
2374                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2375                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2376                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2377                     sdata->vif.type != NL80211_IFTYPE_AP &&
2378                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2379                         break;
2380
2381                 /* verify action & smps_control/chanwidth are present */
2382                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2383                         goto invalid;
2384
2385                 switch (mgmt->u.action.u.ht_smps.action) {
2386                 case WLAN_HT_ACTION_SMPS: {
2387                         struct ieee80211_supported_band *sband;
2388                         enum ieee80211_smps_mode smps_mode;
2389
2390                         /* convert to HT capability */
2391                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2392                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2393                                 smps_mode = IEEE80211_SMPS_OFF;
2394                                 break;
2395                         case WLAN_HT_SMPS_CONTROL_STATIC:
2396                                 smps_mode = IEEE80211_SMPS_STATIC;
2397                                 break;
2398                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2399                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2400                                 break;
2401                         default:
2402                                 goto invalid;
2403                         }
2404
2405                         /* if no change do nothing */
2406                         if (rx->sta->sta.smps_mode == smps_mode)
2407                                 goto handled;
2408                         rx->sta->sta.smps_mode = smps_mode;
2409
2410                         sband = rx->local->hw.wiphy->bands[status->band];
2411
2412                         rate_control_rate_update(local, sband, rx->sta,
2413                                                  IEEE80211_RC_SMPS_CHANGED);
2414                         goto handled;
2415                 }
2416                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2417                         struct ieee80211_supported_band *sband;
2418                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2419                         enum ieee80211_sta_rx_bandwidth new_bw;
2420
2421                         /* If it doesn't support 40 MHz it can't change ... */
2422                         if (!(rx->sta->sta.ht_cap.cap &
2423                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2424                                 goto handled;
2425
2426                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2427                                 new_bw = IEEE80211_STA_RX_BW_20;
2428                         else
2429                                 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2430
2431                         if (rx->sta->sta.bandwidth == new_bw)
2432                                 goto handled;
2433
2434                         sband = rx->local->hw.wiphy->bands[status->band];
2435
2436                         rate_control_rate_update(local, sband, rx->sta,
2437                                                  IEEE80211_RC_BW_CHANGED);
2438                         goto handled;
2439                 }
2440                 default:
2441                         goto invalid;
2442                 }
2443
2444                 break;
2445         case WLAN_CATEGORY_PUBLIC:
2446                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2447                         goto invalid;
2448                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2449                         break;
2450                 if (!rx->sta)
2451                         break;
2452                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2453                         break;
2454                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2455                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2456                         break;
2457                 if (len < offsetof(struct ieee80211_mgmt,
2458                                    u.action.u.ext_chan_switch.variable))
2459                         goto invalid;
2460                 goto queue;
2461         case WLAN_CATEGORY_VHT:
2462                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2463                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2464                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2465                     sdata->vif.type != NL80211_IFTYPE_AP &&
2466                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2467                         break;
2468
2469                 /* verify action code is present */
2470                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2471                         goto invalid;
2472
2473                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2474                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2475                         u8 opmode;
2476
2477                         /* verify opmode is present */
2478                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2479                                 goto invalid;
2480
2481                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2482
2483                         ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2484                                                     opmode, status->band,
2485                                                     false);
2486                         goto handled;
2487                 }
2488                 default:
2489                         break;
2490                 }
2491                 break;
2492         case WLAN_CATEGORY_BACK:
2493                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2494                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2495                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2496                     sdata->vif.type != NL80211_IFTYPE_AP &&
2497                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2498                         break;
2499
2500                 /* verify action_code is present */
2501                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2502                         break;
2503
2504                 switch (mgmt->u.action.u.addba_req.action_code) {
2505                 case WLAN_ACTION_ADDBA_REQ:
2506                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2507                                    sizeof(mgmt->u.action.u.addba_req)))
2508                                 goto invalid;
2509                         break;
2510                 case WLAN_ACTION_ADDBA_RESP:
2511                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2512                                    sizeof(mgmt->u.action.u.addba_resp)))
2513                                 goto invalid;
2514                         break;
2515                 case WLAN_ACTION_DELBA:
2516                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2517                                    sizeof(mgmt->u.action.u.delba)))
2518                                 goto invalid;
2519                         break;
2520                 default:
2521                         goto invalid;
2522                 }
2523
2524                 goto queue;
2525         case WLAN_CATEGORY_SPECTRUM_MGMT:
2526                 if (status->band != IEEE80211_BAND_5GHZ)
2527                         break;
2528
2529                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2530                         break;
2531
2532                 /* verify action_code is present */
2533                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2534                         break;
2535
2536                 switch (mgmt->u.action.u.measurement.action_code) {
2537                 case WLAN_ACTION_SPCT_MSR_REQ:
2538                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2539                                    sizeof(mgmt->u.action.u.measurement)))
2540                                 break;
2541                         ieee80211_process_measurement_req(sdata, mgmt, len);
2542                         goto handled;
2543                 case WLAN_ACTION_SPCT_CHL_SWITCH:
2544                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2545                                 break;
2546
2547                         if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2548                                 break;
2549
2550                         goto queue;
2551                 }
2552                 break;
2553         case WLAN_CATEGORY_SA_QUERY:
2554                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2555                            sizeof(mgmt->u.action.u.sa_query)))
2556                         break;
2557
2558                 switch (mgmt->u.action.u.sa_query.action) {
2559                 case WLAN_ACTION_SA_QUERY_REQUEST:
2560                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2561                                 break;
2562                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2563                         goto handled;
2564                 }
2565                 break;
2566         case WLAN_CATEGORY_SELF_PROTECTED:
2567                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2568                            sizeof(mgmt->u.action.u.self_prot.action_code)))
2569                         break;
2570
2571                 switch (mgmt->u.action.u.self_prot.action_code) {
2572                 case WLAN_SP_MESH_PEERING_OPEN:
2573                 case WLAN_SP_MESH_PEERING_CLOSE:
2574                 case WLAN_SP_MESH_PEERING_CONFIRM:
2575                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2576                                 goto invalid;
2577                         if (sdata->u.mesh.user_mpm)
2578                                 /* userspace handles this frame */
2579                                 break;
2580                         goto queue;
2581                 case WLAN_SP_MGK_INFORM:
2582                 case WLAN_SP_MGK_ACK:
2583                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2584                                 goto invalid;
2585                         break;
2586                 }
2587                 break;
2588         case WLAN_CATEGORY_MESH_ACTION:
2589                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2590                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
2591                         break;
2592
2593                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2594                         break;
2595                 if (mesh_action_is_path_sel(mgmt) &&
2596                     !mesh_path_sel_is_hwmp(sdata))
2597                         break;
2598                 goto queue;
2599         }
2600
2601         return RX_CONTINUE;
2602
2603  invalid:
2604         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2605         /* will return in the next handlers */
2606         return RX_CONTINUE;
2607
2608  handled:
2609         if (rx->sta)
2610                 rx->sta->rx_packets++;
2611         dev_kfree_skb(rx->skb);
2612         return RX_QUEUED;
2613
2614  queue:
2615         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2616         skb_queue_tail(&sdata->skb_queue, rx->skb);
2617         ieee80211_queue_work(&local->hw, &sdata->work);
2618         if (rx->sta)
2619                 rx->sta->rx_packets++;
2620         return RX_QUEUED;
2621 }
2622
2623 static ieee80211_rx_result debug_noinline
2624 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2625 {
2626         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2627         int sig = 0;
2628
2629         /* skip known-bad action frames and return them in the next handler */
2630         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2631                 return RX_CONTINUE;
2632
2633         /*
2634          * Getting here means the kernel doesn't know how to handle
2635          * it, but maybe userspace does ... include returned frames
2636          * so userspace can register for those to know whether ones
2637          * it transmitted were processed or returned.
2638          */
2639
2640         if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2641                 sig = status->signal;
2642
2643         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2644                              rx->skb->data, rx->skb->len,
2645                              GFP_ATOMIC)) {
2646                 if (rx->sta)
2647                         rx->sta->rx_packets++;
2648                 dev_kfree_skb(rx->skb);
2649                 return RX_QUEUED;
2650         }
2651
2652         return RX_CONTINUE;
2653 }
2654
2655 static ieee80211_rx_result debug_noinline
2656 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2657 {
2658         struct ieee80211_local *local = rx->local;
2659         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2660         struct sk_buff *nskb;
2661         struct ieee80211_sub_if_data *sdata = rx->sdata;
2662         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2663
2664         if (!ieee80211_is_action(mgmt->frame_control))
2665                 return RX_CONTINUE;
2666
2667         /*
2668          * For AP mode, hostapd is responsible for handling any action
2669          * frames that we didn't handle, including returning unknown
2670          * ones. For all other modes we will return them to the sender,
2671          * setting the 0x80 bit in the action category, as required by
2672          * 802.11-2012 9.24.4.
2673          * Newer versions of hostapd shall also use the management frame
2674          * registration mechanisms, but older ones still use cooked
2675          * monitor interfaces so push all frames there.
2676          */
2677         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2678             (sdata->vif.type == NL80211_IFTYPE_AP ||
2679              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2680                 return RX_DROP_MONITOR;
2681
2682         if (is_multicast_ether_addr(mgmt->da))
2683                 return RX_DROP_MONITOR;
2684
2685         /* do not return rejected action frames */
2686         if (mgmt->u.action.category & 0x80)
2687                 return RX_DROP_UNUSABLE;
2688
2689         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2690                                GFP_ATOMIC);
2691         if (nskb) {
2692                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2693
2694                 nmgmt->u.action.category |= 0x80;
2695                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2696                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2697
2698                 memset(nskb->cb, 0, sizeof(nskb->cb));
2699
2700                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2701                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2702
2703                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2704                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2705                                       IEEE80211_TX_CTL_NO_CCK_RATE;
2706                         if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2707                                 info->hw_queue =
2708                                         local->hw.offchannel_tx_hw_queue;
2709                 }
2710
2711                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2712                                             status->band);
2713         }
2714         dev_kfree_skb(rx->skb);
2715         return RX_QUEUED;
2716 }
2717
2718 static ieee80211_rx_result debug_noinline
2719 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2720 {
2721         struct ieee80211_sub_if_data *sdata = rx->sdata;
2722         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2723         __le16 stype;
2724
2725         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2726
2727         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2728             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2729             sdata->vif.type != NL80211_IFTYPE_STATION)
2730                 return RX_DROP_MONITOR;
2731
2732         switch (stype) {
2733         case cpu_to_le16(IEEE80211_STYPE_AUTH):
2734         case cpu_to_le16(IEEE80211_STYPE_BEACON):
2735         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2736                 /* process for all: mesh, mlme, ibss */
2737                 break;
2738         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2739         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2740         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2741         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2742                 if (is_multicast_ether_addr(mgmt->da) &&
2743                     !is_broadcast_ether_addr(mgmt->da))
2744                         return RX_DROP_MONITOR;
2745
2746                 /* process only for station */
2747                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2748                         return RX_DROP_MONITOR;
2749                 break;
2750         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2751                 /* process only for ibss and mesh */
2752                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2753                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2754                         return RX_DROP_MONITOR;
2755                 break;
2756         default:
2757                 return RX_DROP_MONITOR;
2758         }
2759
2760         /* queue up frame and kick off work to process it */
2761         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2762         skb_queue_tail(&sdata->skb_queue, rx->skb);
2763         ieee80211_queue_work(&rx->local->hw, &sdata->work);
2764         if (rx->sta)
2765                 rx->sta->rx_packets++;
2766
2767         return RX_QUEUED;
2768 }
2769
2770 /* TODO: use IEEE80211_RX_FRAGMENTED */
2771 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2772                                         struct ieee80211_rate *rate)
2773 {
2774         struct ieee80211_sub_if_data *sdata;
2775         struct ieee80211_local *local = rx->local;
2776         struct sk_buff *skb = rx->skb, *skb2;
2777         struct net_device *prev_dev = NULL;
2778         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2779         int needed_headroom;
2780
2781         /*
2782          * If cooked monitor has been processed already, then
2783          * don't do it again. If not, set the flag.
2784          */
2785         if (rx->flags & IEEE80211_RX_CMNTR)
2786                 goto out_free_skb;
2787         rx->flags |= IEEE80211_RX_CMNTR;
2788
2789         /* If there are no cooked monitor interfaces, just free the SKB */
2790         if (!local->cooked_mntrs)
2791                 goto out_free_skb;
2792
2793         /* room for the radiotap header based on driver features */
2794         needed_headroom = ieee80211_rx_radiotap_space(local, status);
2795
2796         if (skb_headroom(skb) < needed_headroom &&
2797             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2798                 goto out_free_skb;
2799
2800         /* prepend radiotap information */
2801         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2802                                          false);
2803
2804         skb_set_mac_header(skb, 0);
2805         skb->ip_summed = CHECKSUM_UNNECESSARY;
2806         skb->pkt_type = PACKET_OTHERHOST;
2807         skb->protocol = htons(ETH_P_802_2);
2808
2809         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2810                 if (!ieee80211_sdata_running(sdata))
2811                         continue;
2812
2813                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2814                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2815                         continue;
2816
2817                 if (prev_dev) {
2818                         skb2 = skb_clone(skb, GFP_ATOMIC);
2819                         if (skb2) {
2820                                 skb2->dev = prev_dev;
2821                                 netif_receive_skb(skb2);
2822                         }
2823                 }
2824
2825                 prev_dev = sdata->dev;
2826                 sdata->dev->stats.rx_packets++;
2827                 sdata->dev->stats.rx_bytes += skb->len;
2828         }
2829
2830         if (prev_dev) {
2831                 skb->dev = prev_dev;
2832                 netif_receive_skb(skb);
2833                 return;
2834         }
2835
2836  out_free_skb:
2837         dev_kfree_skb(skb);
2838 }
2839
2840 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2841                                          ieee80211_rx_result res)
2842 {
2843         switch (res) {
2844         case RX_DROP_MONITOR:
2845                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2846                 if (rx->sta)
2847                         rx->sta->rx_dropped++;
2848                 /* fall through */
2849         case RX_CONTINUE: {
2850                 struct ieee80211_rate *rate = NULL;
2851                 struct ieee80211_supported_band *sband;
2852                 struct ieee80211_rx_status *status;
2853
2854                 status = IEEE80211_SKB_RXCB((rx->skb));
2855
2856                 sband = rx->local->hw.wiphy->bands[status->band];
2857                 if (!(status->flag & RX_FLAG_HT) &&
2858                     !(status->flag & RX_FLAG_VHT))
2859                         rate = &sband->bitrates[status->rate_idx];
2860
2861                 ieee80211_rx_cooked_monitor(rx, rate);
2862                 break;
2863                 }
2864         case RX_DROP_UNUSABLE:
2865                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2866                 if (rx->sta)
2867                         rx->sta->rx_dropped++;
2868                 dev_kfree_skb(rx->skb);
2869                 break;
2870         case RX_QUEUED:
2871                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2872                 break;
2873         }
2874 }
2875
2876 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2877                                   struct sk_buff_head *frames)
2878 {
2879         ieee80211_rx_result res = RX_DROP_MONITOR;
2880         struct sk_buff *skb;
2881
2882 #define CALL_RXH(rxh)                   \
2883         do {                            \
2884                 res = rxh(rx);          \
2885                 if (res != RX_CONTINUE) \
2886                         goto rxh_next;  \
2887         } while (0);
2888
2889         spin_lock_bh(&rx->local->rx_path_lock);
2890
2891         while ((skb = __skb_dequeue(frames))) {
2892                 /*
2893                  * all the other fields are valid across frames
2894                  * that belong to an aMPDU since they are on the
2895                  * same TID from the same station
2896                  */
2897                 rx->skb = skb;
2898
2899                 CALL_RXH(ieee80211_rx_h_decrypt)
2900                 CALL_RXH(ieee80211_rx_h_check_more_data)
2901                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2902                 CALL_RXH(ieee80211_rx_h_sta_process)
2903                 CALL_RXH(ieee80211_rx_h_defragment)
2904                 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2905                 /* must be after MMIC verify so header is counted in MPDU mic */
2906 #ifdef CONFIG_MAC80211_MESH
2907                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2908                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
2909 #endif
2910                 CALL_RXH(ieee80211_rx_h_amsdu)
2911                 CALL_RXH(ieee80211_rx_h_data)
2912
2913                 /* special treatment -- needs the queue */
2914                 res = ieee80211_rx_h_ctrl(rx, frames);
2915                 if (res != RX_CONTINUE)
2916                         goto rxh_next;
2917
2918                 CALL_RXH(ieee80211_rx_h_mgmt_check)
2919                 CALL_RXH(ieee80211_rx_h_action)
2920                 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2921                 CALL_RXH(ieee80211_rx_h_action_return)
2922                 CALL_RXH(ieee80211_rx_h_mgmt)
2923
2924  rxh_next:
2925                 ieee80211_rx_handlers_result(rx, res);
2926
2927 #undef CALL_RXH
2928         }
2929
2930         spin_unlock_bh(&rx->local->rx_path_lock);
2931 }
2932
2933 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2934 {
2935         struct sk_buff_head reorder_release;
2936         ieee80211_rx_result res = RX_DROP_MONITOR;
2937
2938         __skb_queue_head_init(&reorder_release);
2939
2940 #define CALL_RXH(rxh)                   \
2941         do {                            \
2942                 res = rxh(rx);          \
2943                 if (res != RX_CONTINUE) \
2944                         goto rxh_next;  \
2945         } while (0);
2946
2947         CALL_RXH(ieee80211_rx_h_check)
2948
2949         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
2950
2951         ieee80211_rx_handlers(rx, &reorder_release);
2952         return;
2953
2954  rxh_next:
2955         ieee80211_rx_handlers_result(rx, res);
2956
2957 #undef CALL_RXH
2958 }
2959
2960 /*
2961  * This function makes calls into the RX path, therefore
2962  * it has to be invoked under RCU read lock.
2963  */
2964 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2965 {
2966         struct sk_buff_head frames;
2967         struct ieee80211_rx_data rx = {
2968                 .sta = sta,
2969                 .sdata = sta->sdata,
2970                 .local = sta->local,
2971                 /* This is OK -- must be QoS data frame */
2972                 .security_idx = tid,
2973                 .seqno_idx = tid,
2974                 .flags = 0,
2975         };
2976         struct tid_ampdu_rx *tid_agg_rx;
2977
2978         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2979         if (!tid_agg_rx)
2980                 return;
2981
2982         __skb_queue_head_init(&frames);
2983
2984         spin_lock(&tid_agg_rx->reorder_lock);
2985         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
2986         spin_unlock(&tid_agg_rx->reorder_lock);
2987
2988         ieee80211_rx_handlers(&rx, &frames);
2989 }
2990
2991 /* main receive path */
2992
2993 static int prepare_for_handlers(struct ieee80211_rx_data *rx,
2994                                 struct ieee80211_hdr *hdr)
2995 {
2996         struct ieee80211_sub_if_data *sdata = rx->sdata;
2997         struct sk_buff *skb = rx->skb;
2998         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2999         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3000         int multicast = is_multicast_ether_addr(hdr->addr1);
3001
3002         switch (sdata->vif.type) {
3003         case NL80211_IFTYPE_STATION:
3004                 if (!bssid && !sdata->u.mgd.use_4addr)
3005                         return 0;
3006                 if (!multicast &&
3007                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3008                         if (!(sdata->dev->flags & IFF_PROMISC) ||
3009                             sdata->u.mgd.use_4addr)
3010                                 return 0;
3011                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3012                 }
3013                 break;
3014         case NL80211_IFTYPE_ADHOC:
3015                 if (!bssid)
3016                         return 0;
3017                 if (ieee80211_is_beacon(hdr->frame_control)) {
3018                         return 1;
3019                 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3020                         return 0;
3021                 } else if (!multicast &&
3022                            !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3023                         if (!(sdata->dev->flags & IFF_PROMISC))
3024                                 return 0;
3025                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3026                 } else if (!rx->sta) {
3027                         int rate_idx;
3028                         if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3029                                 rate_idx = 0; /* TODO: HT/VHT rates */
3030                         else
3031                                 rate_idx = status->rate_idx;
3032                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3033                                                  BIT(rate_idx));
3034                 }
3035                 break;
3036         case NL80211_IFTYPE_MESH_POINT:
3037                 if (!multicast &&
3038                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3039                         if (!(sdata->dev->flags & IFF_PROMISC))
3040                                 return 0;
3041
3042                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3043                 }
3044                 break;
3045         case NL80211_IFTYPE_AP_VLAN:
3046         case NL80211_IFTYPE_AP:
3047                 if (!bssid) {
3048                         if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3049                                 return 0;
3050                 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3051                         /*
3052                          * Accept public action frames even when the
3053                          * BSSID doesn't match, this is used for P2P
3054                          * and location updates. Note that mac80211
3055                          * itself never looks at these frames.
3056                          */
3057                         if (!multicast &&
3058                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3059                                 return 0;
3060                         if (ieee80211_is_public_action(hdr, skb->len))
3061                                 return 1;
3062                         if (!ieee80211_is_beacon(hdr->frame_control))
3063                                 return 0;
3064                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3065                 }
3066                 break;
3067         case NL80211_IFTYPE_WDS:
3068                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3069                         return 0;
3070                 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3071                         return 0;
3072                 break;
3073         case NL80211_IFTYPE_P2P_DEVICE:
3074                 if (!ieee80211_is_public_action(hdr, skb->len) &&
3075                     !ieee80211_is_probe_req(hdr->frame_control) &&
3076                     !ieee80211_is_probe_resp(hdr->frame_control) &&
3077                     !ieee80211_is_beacon(hdr->frame_control))
3078                         return 0;
3079                 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3080                     !multicast)
3081                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3082                 break;
3083         default:
3084                 /* should never get here */
3085                 WARN_ON_ONCE(1);
3086                 break;
3087         }
3088
3089         return 1;
3090 }
3091
3092 /*
3093  * This function returns whether or not the SKB
3094  * was destined for RX processing or not, which,
3095  * if consume is true, is equivalent to whether
3096  * or not the skb was consumed.
3097  */
3098 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3099                                             struct sk_buff *skb, bool consume)
3100 {
3101         struct ieee80211_local *local = rx->local;
3102         struct ieee80211_sub_if_data *sdata = rx->sdata;
3103         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3104         struct ieee80211_hdr *hdr = (void *)skb->data;
3105         int prepares;
3106
3107         rx->skb = skb;
3108         status->rx_flags |= IEEE80211_RX_RA_MATCH;
3109         prepares = prepare_for_handlers(rx, hdr);
3110
3111         if (!prepares)
3112                 return false;
3113
3114         if (!consume) {
3115                 skb = skb_copy(skb, GFP_ATOMIC);
3116                 if (!skb) {
3117                         if (net_ratelimit())
3118                                 wiphy_debug(local->hw.wiphy,
3119                                         "failed to copy skb for %s\n",
3120                                         sdata->name);
3121                         return true;
3122                 }
3123
3124                 rx->skb = skb;
3125         }
3126
3127         ieee80211_invoke_rx_handlers(rx);
3128         return true;
3129 }
3130
3131 /*
3132  * This is the actual Rx frames handler. as it blongs to Rx path it must
3133  * be called with rcu_read_lock protection.
3134  */
3135 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3136                                          struct sk_buff *skb)
3137 {
3138         struct ieee80211_local *local = hw_to_local(hw);
3139         struct ieee80211_sub_if_data *sdata;
3140         struct ieee80211_hdr *hdr;
3141         __le16 fc;
3142         struct ieee80211_rx_data rx;
3143         struct ieee80211_sub_if_data *prev;
3144         struct sta_info *sta, *tmp, *prev_sta;
3145         int err = 0;
3146
3147         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3148         memset(&rx, 0, sizeof(rx));
3149         rx.skb = skb;
3150         rx.local = local;
3151
3152         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3153                 local->dot11ReceivedFragmentCount++;
3154
3155         if (ieee80211_is_mgmt(fc)) {
3156                 /* drop frame if too short for header */
3157                 if (skb->len < ieee80211_hdrlen(fc))
3158                         err = -ENOBUFS;
3159                 else
3160                         err = skb_linearize(skb);
3161         } else {
3162                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3163         }
3164
3165         if (err) {
3166                 dev_kfree_skb(skb);
3167                 return;
3168         }
3169
3170         hdr = (struct ieee80211_hdr *)skb->data;
3171         ieee80211_parse_qos(&rx);
3172         ieee80211_verify_alignment(&rx);
3173
3174         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3175                      ieee80211_is_beacon(hdr->frame_control)))
3176                 ieee80211_scan_rx(local, skb);
3177
3178         if (ieee80211_is_data(fc)) {
3179                 prev_sta = NULL;
3180
3181                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
3182                         if (!prev_sta) {
3183                                 prev_sta = sta;
3184                                 continue;
3185                         }
3186
3187                         rx.sta = prev_sta;
3188                         rx.sdata = prev_sta->sdata;
3189                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
3190
3191                         prev_sta = sta;
3192                 }
3193
3194                 if (prev_sta) {
3195                         rx.sta = prev_sta;
3196                         rx.sdata = prev_sta->sdata;
3197
3198                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3199                                 return;
3200                         goto out;
3201                 }
3202         }
3203
3204         prev = NULL;
3205
3206         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3207                 if (!ieee80211_sdata_running(sdata))
3208                         continue;
3209
3210                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3211                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3212                         continue;
3213
3214                 /*
3215                  * frame is destined for this interface, but if it's
3216                  * not also for the previous one we handle that after
3217                  * the loop to avoid copying the SKB once too much
3218                  */
3219
3220                 if (!prev) {
3221                         prev = sdata;
3222                         continue;
3223                 }
3224
3225                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3226                 rx.sdata = prev;
3227                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3228
3229                 prev = sdata;
3230         }
3231
3232         if (prev) {
3233                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3234                 rx.sdata = prev;
3235
3236                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3237                         return;
3238         }
3239
3240  out:
3241         dev_kfree_skb(skb);
3242 }
3243
3244 /*
3245  * This is the receive path handler. It is called by a low level driver when an
3246  * 802.11 MPDU is received from the hardware.
3247  */
3248 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3249 {
3250         struct ieee80211_local *local = hw_to_local(hw);
3251         struct ieee80211_rate *rate = NULL;
3252         struct ieee80211_supported_band *sband;
3253         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3254
3255         WARN_ON_ONCE(softirq_count() == 0);
3256
3257         if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3258                 goto drop;
3259
3260         sband = local->hw.wiphy->bands[status->band];
3261         if (WARN_ON(!sband))
3262                 goto drop;
3263
3264         /*
3265          * If we're suspending, it is possible although not too likely
3266          * that we'd be receiving frames after having already partially
3267          * quiesced the stack. We can't process such frames then since
3268          * that might, for example, cause stations to be added or other
3269          * driver callbacks be invoked.
3270          */
3271         if (unlikely(local->quiescing || local->suspended))
3272                 goto drop;
3273
3274         /* We might be during a HW reconfig, prevent Rx for the same reason */
3275         if (unlikely(local->in_reconfig))
3276                 goto drop;
3277
3278         /*
3279          * The same happens when we're not even started,
3280          * but that's worth a warning.
3281          */
3282         if (WARN_ON(!local->started))
3283                 goto drop;
3284
3285         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3286                 /*
3287                  * Validate the rate, unless a PLCP error means that
3288                  * we probably can't have a valid rate here anyway.
3289                  */
3290
3291                 if (status->flag & RX_FLAG_HT) {
3292                         /*
3293                          * rate_idx is MCS index, which can be [0-76]
3294                          * as documented on:
3295                          *
3296                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3297                          *
3298                          * Anything else would be some sort of driver or
3299                          * hardware error. The driver should catch hardware
3300                          * errors.
3301                          */
3302                         if (WARN(status->rate_idx > 76,
3303                                  "Rate marked as an HT rate but passed "
3304                                  "status->rate_idx is not "
3305                                  "an MCS index [0-76]: %d (0x%02x)\n",
3306                                  status->rate_idx,
3307                                  status->rate_idx))
3308                                 goto drop;
3309                 } else if (status->flag & RX_FLAG_VHT) {
3310                         if (WARN_ONCE(status->rate_idx > 9 ||
3311                                       !status->vht_nss ||
3312                                       status->vht_nss > 8,
3313                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3314                                       status->rate_idx, status->vht_nss))
3315                                 goto drop;
3316                 } else {
3317                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3318                                 goto drop;
3319                         rate = &sband->bitrates[status->rate_idx];
3320                 }
3321         }
3322
3323         status->rx_flags = 0;
3324
3325         /*
3326          * key references and virtual interfaces are protected using RCU
3327          * and this requires that we are in a read-side RCU section during
3328          * receive processing
3329          */
3330         rcu_read_lock();
3331
3332         /*
3333          * Frames with failed FCS/PLCP checksum are not returned,
3334          * all other frames are returned without radiotap header
3335          * if it was previously present.
3336          * Also, frames with less than 16 bytes are dropped.
3337          */
3338         skb = ieee80211_rx_monitor(local, skb, rate);
3339         if (!skb) {
3340                 rcu_read_unlock();
3341                 return;
3342         }
3343
3344         ieee80211_tpt_led_trig_rx(local,
3345                         ((struct ieee80211_hdr *)skb->data)->frame_control,
3346                         skb->len);
3347         __ieee80211_rx_handle_packet(hw, skb);
3348
3349         rcu_read_unlock();
3350
3351         return;
3352  drop:
3353         kfree_skb(skb);
3354 }
3355 EXPORT_SYMBOL(ieee80211_rx);
3356
3357 /* This is a version of the rx handler that can be called from hard irq
3358  * context. Post the skb on the queue and schedule the tasklet */
3359 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3360 {
3361         struct ieee80211_local *local = hw_to_local(hw);
3362
3363         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3364
3365         skb->pkt_type = IEEE80211_RX_MSG;
3366         skb_queue_tail(&local->skb_queue, skb);
3367         tasklet_schedule(&local->tasklet);
3368 }
3369 EXPORT_SYMBOL(ieee80211_rx_irqsafe);