Pileus Git - ~andy/linux/blob - 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                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 262                 *pos++ = local->hw.radiotap_mcs_details;
 263                 *pos = 0;
 264                 if (status->flag & RX_FLAG_SHORT_GI)
 265                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 266                 if (status->flag & RX_FLAG_40MHZ)
 267                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 268                 if (status->flag & RX_FLAG_HT_GF)
 269                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 270                 pos++;
 271                 *pos++ = status->rate_idx;
 272         }
 273
 274         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 275                 u16 flags = 0;
 276
 277                 /* ensure 4 byte alignment */
 278                 while ((pos - (u8 *)rthdr) & 3)
 279                         pos++;
 280                 rthdr->it_present |=
 281                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 282                 put_unaligned_le32(status->ampdu_reference, pos);
 283                 pos += 4;
 284                 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
 285                         flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
 286                 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
 287                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
 288                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 289                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 290                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 291                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 292                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 293                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 294                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 295                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 296                 put_unaligned_le16(flags, pos);
 297                 pos += 2;
 298                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 299                         *pos++ = status->ampdu_delimiter_crc;
 300                 else
 301                         *pos++ = 0;
 302                 *pos++ = 0;
 303         }
 304
 305         if (status->flag & RX_FLAG_VHT) {
 306                 u16 known = local->hw.radiotap_vht_details;
 307
 308                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 309                 /* known field - how to handle 80+80? */
 310                 if (status->flag & RX_FLAG_80P80MHZ)
 311                         known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 312                 put_unaligned_le16(known, pos);
 313                 pos += 2;
 314                 /* flags */
 315                 if (status->flag & RX_FLAG_SHORT_GI)
 316                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 317                 pos++;
 318                 /* bandwidth */
 319                 if (status->flag & RX_FLAG_80MHZ)
 320                         *pos++ = 4;
 321                 else if (status->flag & RX_FLAG_80P80MHZ)
 322                         *pos++ = 0; /* marked not known above */
 323                 else if (status->flag & RX_FLAG_160MHZ)
 324                         *pos++ = 11;
 325                 else if (status->flag & RX_FLAG_40MHZ)
 326                         *pos++ = 1;
 327                 else /* 20 MHz */
 328                         *pos++ = 0;
 329                 /* MCS/NSS */
 330                 *pos = (status->rate_idx << 4) | status->vht_nss;
 331                 pos += 4;
 332                 /* coding field */
 333                 pos++;
 334                 /* group ID */
 335                 pos++;
 336                 /* partial_aid */
 337                 pos += 2;
 338         }
 339
 340         if (status->vendor_radiotap_len) {
 341                 /* ensure 2 byte alignment for the vendor field as required */
 342                 if ((pos - (u8 *)rthdr) & 1)
 343                         *pos++ = 0;
 344                 *pos++ = status->vendor_radiotap_oui[0];
 345                 *pos++ = status->vendor_radiotap_oui[1];
 346                 *pos++ = status->vendor_radiotap_oui[2];
 347                 *pos++ = status->vendor_radiotap_subns;
 348                 put_unaligned_le16(status->vendor_radiotap_len, pos);
 349                 pos += 2;
 350                 /* align the actual payload as requested */
 351                 while ((pos - (u8 *)rthdr) & (status->vendor_radiotap_align - 1))
 352                         *pos++ = 0;
 353         }
 354 }
 355
 356 /*
 357  * This function copies a received frame to all monitor interfaces and
 358  * returns a cleaned-up SKB that no longer includes the FCS nor the
 359  * radiotap header the driver might have added.
 360  */
 361 static struct sk_buff *
 362 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 363                      struct ieee80211_rate *rate)
 364 {
 365         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 366         struct ieee80211_sub_if_data *sdata;
 367         int needed_headroom;
 368         struct sk_buff *skb, *skb2;
 369         struct net_device *prev_dev = NULL;
 370         int present_fcs_len = 0;
 371
 372         /*
 373          * First, we may need to make a copy of the skb because
 374          *  (1) we need to modify it for radiotap (if not present), and
 375          *  (2) the other RX handlers will modify the skb we got.
 376          *
 377          * We don't need to, of course, if we aren't going to return
 378          * the SKB because it has a bad FCS/PLCP checksum.
 379          */
 380
 381         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
 382                 present_fcs_len = FCS_LEN;
 383
 384         /* ensure hdr->frame_control and vendor radiotap data are in skb head */
 385         if (!pskb_may_pull(origskb, 2 + status->vendor_radiotap_len)) {
 386                 dev_kfree_skb(origskb);
 387                 return NULL;
 388         }
 389
 390         if (!local->monitors) {
 391                 if (should_drop_frame(origskb, present_fcs_len)) {
 392                         dev_kfree_skb(origskb);
 393                         return NULL;
 394                 }
 395
 396                 return remove_monitor_info(local, origskb);
 397         }
 398
 399         /* room for the radiotap header based on driver features */
 400         needed_headroom = ieee80211_rx_radiotap_space(local, status);
 401
 402         if (should_drop_frame(origskb, present_fcs_len)) {
 403                 /* only need to expand headroom if necessary */
 404                 skb = origskb;
 405                 origskb = NULL;
 406
 407                 /*
 408                  * This shouldn't trigger often because most devices have an
 409                  * RX header they pull before we get here, and that should
 410                  * be big enough for our radiotap information. We should
 411                  * probably export the length to drivers so that we can have
 412                  * them allocate enough headroom to start with.
 413                  */
 414                 if (skb_headroom(skb) < needed_headroom &&
 415                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 416                         dev_kfree_skb(skb);
 417                         return NULL;
 418                 }
 419         } else {
 420                 /*
 421                  * Need to make a copy and possibly remove radiotap header
 422                  * and FCS from the original.
 423                  */
 424                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
 425
 426                 origskb = remove_monitor_info(local, origskb);
 427
 428                 if (!skb)
 429                         return origskb;
 430         }
 431
 432         /* prepend radiotap information */
 433         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
 434                                          true);
 435
 436         skb_reset_mac_header(skb);
 437         skb->ip_summed = CHECKSUM_UNNECESSARY;
 438         skb->pkt_type = PACKET_OTHERHOST;
 439         skb->protocol = htons(ETH_P_802_2);
 440
 441         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 442                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
 443                         continue;
 444
 445                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
 446                         continue;
 447
 448                 if (!ieee80211_sdata_running(sdata))
 449                         continue;
 450
 451                 if (prev_dev) {
 452                         skb2 = skb_clone(skb, GFP_ATOMIC);
 453                         if (skb2) {
 454                                 skb2->dev = prev_dev;
 455                                 netif_receive_skb(skb2);
 456                         }
 457                 }
 458
 459                 prev_dev = sdata->dev;
 460                 sdata->dev->stats.rx_packets++;
 461                 sdata->dev->stats.rx_bytes += skb->len;
 462         }
 463
 464         if (prev_dev) {
 465                 skb->dev = prev_dev;
 466                 netif_receive_skb(skb);
 467         } else
 468                 dev_kfree_skb(skb);
 469
 470         return origskb;
 471 }
 472
 473 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 474 {
 475         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 476         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 477         int tid, seqno_idx, security_idx;
 478
 479         /* does the frame have a qos control field? */
 480         if (ieee80211_is_data_qos(hdr->frame_control)) {
 481                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 482                 /* frame has qos control */
 483                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 484                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 485                         status->rx_flags |= IEEE80211_RX_AMSDU;
 486
 487                 seqno_idx = tid;
 488                 security_idx = tid;
 489         } else {
 490                 /*
 491                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 492                  *
 493                  *      Sequence numbers for management frames, QoS data
 494                  *      frames with a broadcast/multicast address in the
 495                  *      Address 1 field, and all non-QoS data frames sent
 496                  *      by QoS STAs are assigned using an additional single
 497                  *      modulo-4096 counter, [...]
 498                  *
 499                  * We also use that counter for non-QoS STAs.
 500                  */
 501                 seqno_idx = IEEE80211_NUM_TIDS;
 502                 security_idx = 0;
 503                 if (ieee80211_is_mgmt(hdr->frame_control))
 504                         security_idx = IEEE80211_NUM_TIDS;
 505                 tid = 0;
 506         }
 507
 508         rx->seqno_idx = seqno_idx;
 509         rx->security_idx = security_idx;
 510         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 511          * For now, set skb->priority to 0 for other cases. */
 512         rx->skb->priority = (tid > 7) ? 0 : tid;
 513 }
 514
 515 /**
 516  * DOC: Packet alignment
 517  *
 518  * Drivers always need to pass packets that are aligned to two-byte boundaries
 519  * to the stack.
 520  *
 521  * Additionally, should, if possible, align the payload data in a way that
 522  * guarantees that the contained IP header is aligned to a four-byte
 523  * boundary. In the case of regular frames, this simply means aligning the
 524  * payload to a four-byte boundary (because either the IP header is directly
 525  * contained, or IV/RFC1042 headers that have a length divisible by four are
 526  * in front of it).  If the payload data is not properly aligned and the
 527  * architecture doesn't support efficient unaligned operations, mac80211
 528  * will align the data.
 529  *
 530  * With A-MSDU frames, however, the payload data address must yield two modulo
 531  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 532  * push the IP header further back to a multiple of four again. Thankfully, the
 533  * specs were sane enough this time around to require padding each A-MSDU
 534  * subframe to a length that is a multiple of four.
 535  *
 536  * Padding like Atheros hardware adds which is between the 802.11 header and
 537  * the payload is not supported, the driver is required to move the 802.11
 538  * header to be directly in front of the payload in that case.
 539  */
 540 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 541 {
 542 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 543         WARN_ONCE((unsigned long)rx->skb->data & 1,
 544                   "unaligned packet at 0x%p\n", rx->skb->data);
 545 #endif
 546 }
 547
 548
 549 /* rx handlers */
 550
 551 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 552 {
 553         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 554
 555         if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
 556                 return 0;
 557
 558         return ieee80211_is_robust_mgmt_frame(hdr);
 559 }
 560
 561
 562 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 563 {
 564         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 565
 566         if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
 567                 return 0;
 568
 569         return ieee80211_is_robust_mgmt_frame(hdr);
 570 }
 571
 572
 573 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 574 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 575 {
 576         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 577         struct ieee80211_mmie *mmie;
 578
 579         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 580                 return -1;
 581
 582         if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
 583                 return -1; /* not a robust management frame */
 584
 585         mmie = (struct ieee80211_mmie *)
 586                 (skb->data + skb->len - sizeof(*mmie));
 587         if (mmie->element_id != WLAN_EID_MMIE ||
 588             mmie->length != sizeof(*mmie) - 2)
 589                 return -1;
 590
 591         return le16_to_cpu(mmie->key_id);
 592 }
 593
 594 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
 595 {
 596         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 597         char *dev_addr = rx->sdata->vif.addr;
 598
 599         if (ieee80211_is_data(hdr->frame_control)) {
 600                 if (is_multicast_ether_addr(hdr->addr1)) {
 601                         if (ieee80211_has_tods(hdr->frame_control) ||
 602                             !ieee80211_has_fromds(hdr->frame_control))
 603                                 return RX_DROP_MONITOR;
 604                         if (ether_addr_equal(hdr->addr3, dev_addr))
 605                                 return RX_DROP_MONITOR;
 606                 } else {
 607                         if (!ieee80211_has_a4(hdr->frame_control))
 608                                 return RX_DROP_MONITOR;
 609                         if (ether_addr_equal(hdr->addr4, dev_addr))
 610                                 return RX_DROP_MONITOR;
 611                 }
 612         }
 613
 614         /* If there is not an established peer link and this is not a peer link
 615          * establisment frame, beacon or probe, drop the frame.
 616          */
 617
 618         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
 619                 struct ieee80211_mgmt *mgmt;
 620
 621                 if (!ieee80211_is_mgmt(hdr->frame_control))
 622                         return RX_DROP_MONITOR;
 623
 624                 if (ieee80211_is_action(hdr->frame_control)) {
 625                         u8 category;
 626
 627                         /* make sure category field is present */
 628                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
 629                                 return RX_DROP_MONITOR;
 630
 631                         mgmt = (struct ieee80211_mgmt *)hdr;
 632                         category = mgmt->u.action.category;
 633                         if (category != WLAN_CATEGORY_MESH_ACTION &&
 634                             category != WLAN_CATEGORY_SELF_PROTECTED)
 635                                 return RX_DROP_MONITOR;
 636                         return RX_CONTINUE;
 637                 }
 638
 639                 if (ieee80211_is_probe_req(hdr->frame_control) ||
 640                     ieee80211_is_probe_resp(hdr->frame_control) ||
 641                     ieee80211_is_beacon(hdr->frame_control) ||
 642                     ieee80211_is_auth(hdr->frame_control))
 643                         return RX_CONTINUE;
 644
 645                 return RX_DROP_MONITOR;
 646         }
 647
 648         return RX_CONTINUE;
 649 }
 650
 651 #define SEQ_MODULO 0x1000
 652 #define SEQ_MASK   0xfff
 653
 654 static inline int seq_less(u16 sq1, u16 sq2)
 655 {
 656         return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
 657 }
 658
 659 static inline u16 seq_inc(u16 sq)
 660 {
 661         return (sq + 1) & SEQ_MASK;
 662 }
 663
 664 static inline u16 seq_sub(u16 sq1, u16 sq2)
 665 {
 666         return (sq1 - sq2) & SEQ_MASK;
 667 }
 668
 669 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
 670                                             struct tid_ampdu_rx *tid_agg_rx,
 671                                             int index)
 672 {
 673         struct ieee80211_local *local = sdata->local;
 674         struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
 675         struct ieee80211_rx_status *status;
 676
 677         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 678
 679         if (!skb)
 680                 goto no_frame;
 681
 682         /* release the frame from the reorder ring buffer */
 683         tid_agg_rx->stored_mpdu_num--;
 684         tid_agg_rx->reorder_buf[index] = NULL;
 685         status = IEEE80211_SKB_RXCB(skb);
 686         status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
 687         skb_queue_tail(&local->rx_skb_queue, skb);
 688
 689 no_frame:
 690         tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
 691 }
 692
 693 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
 694                                              struct tid_ampdu_rx *tid_agg_rx,
 695                                              u16 head_seq_num)
 696 {
 697         int index;
 698
 699         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 700
 701         while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
 702                 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
 703                                                         tid_agg_rx->buf_size;
 704                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index);
 705         }
 706 }
 707
 708 /*
 709  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
 710  * the skb was added to the buffer longer than this time ago, the earlier
 711  * frames that have not yet been received are assumed to be lost and the skb
 712  * can be released for processing. This may also release other skb's from the
 713  * reorder buffer if there are no additional gaps between the frames.
 714  *
 715  * Callers must hold tid_agg_rx->reorder_lock.
 716  */
 717 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
 718
 719 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
 720                                           struct tid_ampdu_rx *tid_agg_rx)
 721 {
 722         int index, j;
 723
 724         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 725
 726         /* release the buffer until next missing frame */
 727         index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
 728                                                 tid_agg_rx->buf_size;
 729         if (!tid_agg_rx->reorder_buf[index] &&
 730             tid_agg_rx->stored_mpdu_num) {
 731                 /*
 732                  * No buffers ready to be released, but check whether any
 733                  * frames in the reorder buffer have timed out.
 734                  */
 735                 int skipped = 1;
 736                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
 737                      j = (j + 1) % tid_agg_rx->buf_size) {
 738                         if (!tid_agg_rx->reorder_buf[j]) {
 739                                 skipped++;
 740                                 continue;
 741                         }
 742                         if (skipped &&
 743                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
 744                                         HT_RX_REORDER_BUF_TIMEOUT))
 745                                 goto set_release_timer;
 746
 747                         ht_dbg_ratelimited(sdata,
 748                                            "release an RX reorder frame due to timeout on earlier frames\n");
 749                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j);
 750
 751                         /*
 752                          * Increment the head seq# also for the skipped slots.
 753                          */
 754                         tid_agg_rx->head_seq_num =
 755                                 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
 756                         skipped = 0;
 757                 }
 758         } else while (tid_agg_rx->reorder_buf[index]) {
 759                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index);
 760                 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
 761                                                         tid_agg_rx->buf_size;
 762         }
 763
 764         if (tid_agg_rx->stored_mpdu_num) {
 765                 j = index = seq_sub(tid_agg_rx->head_seq_num,
 766                                     tid_agg_rx->ssn) % tid_agg_rx->buf_size;
 767
 768                 for (; j != (index - 1) % tid_agg_rx->buf_size;
 769                      j = (j + 1) % tid_agg_rx->buf_size) {
 770                         if (tid_agg_rx->reorder_buf[j])
 771                                 break;
 772                 }
 773
 774  set_release_timer:
 775
 776                 mod_timer(&tid_agg_rx->reorder_timer,
 777                           tid_agg_rx->reorder_time[j] + 1 +
 778                           HT_RX_REORDER_BUF_TIMEOUT);
 779         } else {
 780                 del_timer(&tid_agg_rx->reorder_timer);
 781         }
 782 }
 783
 784 /*
 785  * As this function belongs to the RX path it must be under
 786  * rcu_read_lock protection. It returns false if the frame
 787  * can be processed immediately, true if it was consumed.
 788  */
 789 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
 790                                              struct tid_ampdu_rx *tid_agg_rx,
 791                                              struct sk_buff *skb)
 792 {
 793         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 794         u16 sc = le16_to_cpu(hdr->seq_ctrl);
 795         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
 796         u16 head_seq_num, buf_size;
 797         int index;
 798         bool ret = true;
 799
 800         spin_lock(&tid_agg_rx->reorder_lock);
 801
 802         buf_size = tid_agg_rx->buf_size;
 803         head_seq_num = tid_agg_rx->head_seq_num;
 804
 805         /* frame with out of date sequence number */
 806         if (seq_less(mpdu_seq_num, head_seq_num)) {
 807                 dev_kfree_skb(skb);
 808                 goto out;
 809         }
 810
 811         /*
 812          * If frame the sequence number exceeds our buffering window
 813          * size release some previous frames to make room for this one.
 814          */
 815         if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
 816                 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
 817                 /* release stored frames up to new head to stack */
 818                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
 819                                                  head_seq_num);
 820         }
 821
 822         /* Now the new frame is always in the range of the reordering buffer */
 823
 824         index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
 825
 826         /* check if we already stored this frame */
 827         if (tid_agg_rx->reorder_buf[index]) {
 828                 dev_kfree_skb(skb);
 829                 goto out;
 830         }
 831
 832         /*
 833          * If the current MPDU is in the right order and nothing else
 834          * is stored we can process it directly, no need to buffer it.
 835          * If it is first but there's something stored, we may be able
 836          * to release frames after this one.
 837          */
 838         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
 839             tid_agg_rx->stored_mpdu_num == 0) {
 840                 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
 841                 ret = false;
 842                 goto out;
 843         }
 844
 845         /* put the frame in the reordering buffer */
 846         tid_agg_rx->reorder_buf[index] = skb;
 847         tid_agg_rx->reorder_time[index] = jiffies;
 848         tid_agg_rx->stored_mpdu_num++;
 849         ieee80211_sta_reorder_release(sdata, tid_agg_rx);
 850
 851  out:
 852         spin_unlock(&tid_agg_rx->reorder_lock);
 853         return ret;
 854 }
 855
 856 /*
 857  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
 858  * true if the MPDU was buffered, false if it should be processed.
 859  */
 860 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
 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                 return;
 927
 928  dont_reorder:
 929         skb_queue_tail(&local->rx_skb_queue, skb);
 930 }
 931
 932 static ieee80211_rx_result debug_noinline
 933 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
 934 {
 935         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 936         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 937
 938         /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
 939         if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
 940                 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
 941                              rx->sta->last_seq_ctrl[rx->seqno_idx] ==
 942                              hdr->seq_ctrl)) {
 943                         if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
 944                                 rx->local->dot11FrameDuplicateCount++;
 945                                 rx->sta->num_duplicates++;
 946                         }
 947                         return RX_DROP_UNUSABLE;
 948                 } else
 949                         rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
 950         }
 951
 952         if (unlikely(rx->skb->len < 16)) {
 953                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
 954                 return RX_DROP_MONITOR;
 955         }
 956
 957         /* Drop disallowed frame classes based on STA auth/assoc state;
 958          * IEEE 802.11, Chap 5.5.
 959          *
 960          * mac80211 filters only based on association state, i.e. it drops
 961          * Class 3 frames from not associated stations. hostapd sends
 962          * deauth/disassoc frames when needed. In addition, hostapd is
 963          * responsible for filtering on both auth and assoc states.
 964          */
 965
 966         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
 967                 return ieee80211_rx_mesh_check(rx);
 968
 969         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
 970                       ieee80211_is_pspoll(hdr->frame_control)) &&
 971                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
 972                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
 973                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
 974                 /*
 975                  * accept port control frames from the AP even when it's not
 976                  * yet marked ASSOC to prevent a race where we don't set the
 977                  * assoc bit quickly enough before it sends the first frame
 978                  */
 979                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
 980                     ieee80211_is_data_present(hdr->frame_control)) {
 981                         unsigned int hdrlen;
 982                         __be16 ethertype;
 983
 984                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 985
 986                         if (rx->skb->len < hdrlen + 8)
 987                                 return RX_DROP_MONITOR;
 988
 989                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
 990                         if (ethertype == rx->sdata->control_port_protocol)
 991                                 return RX_CONTINUE;
 992                 }
 993
 994                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
 995                     cfg80211_rx_spurious_frame(rx->sdata->dev,
 996                                                hdr->addr2,
 997                                                GFP_ATOMIC))
 998                         return RX_DROP_UNUSABLE;
 999
1000                 return RX_DROP_MONITOR;
1001         }
1002
1003         return RX_CONTINUE;
1004 }
1005
1006
1007 static ieee80211_rx_result debug_noinline
1008 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1009 {
1010         struct sk_buff *skb = rx->skb;
1011         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1012         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1013         int keyidx;
1014         int hdrlen;
1015         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1016         struct ieee80211_key *sta_ptk = NULL;
1017         int mmie_keyidx = -1;
1018         __le16 fc;
1019
1020         /*
1021          * Key selection 101
1022          *
1023          * There are four types of keys:
1024          *  - GTK (group keys)
1025          *  - IGTK (group keys for management frames)
1026          *  - PTK (pairwise keys)
1027          *  - STK (station-to-station pairwise keys)
1028          *
1029          * When selecting a key, we have to distinguish between multicast
1030          * (including broadcast) and unicast frames, the latter can only
1031          * use PTKs and STKs while the former always use GTKs and IGTKs.
1032          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1033          * unicast frames can also use key indices like GTKs. Hence, if we
1034          * don't have a PTK/STK we check the key index for a WEP key.
1035          *
1036          * Note that in a regular BSS, multicast frames are sent by the
1037          * AP only, associated stations unicast the frame to the AP first
1038          * which then multicasts it on their behalf.
1039          *
1040          * There is also a slight problem in IBSS mode: GTKs are negotiated
1041          * with each station, that is something we don't currently handle.
1042          * The spec seems to expect that one negotiates the same key with
1043          * every station but there's no such requirement; VLANs could be
1044          * possible.
1045          */
1046
1047         /*
1048          * No point in finding a key and decrypting if the frame is neither
1049          * addressed to us nor a multicast frame.
1050          */
1051         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1052                 return RX_CONTINUE;
1053
1054         /* start without a key */
1055         rx->key = NULL;
1056
1057         if (rx->sta)
1058                 sta_ptk = rcu_dereference(rx->sta->ptk);
1059
1060         fc = hdr->frame_control;
1061
1062         if (!ieee80211_has_protected(fc))
1063                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1064
1065         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1066                 rx->key = sta_ptk;
1067                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1068                     (status->flag & RX_FLAG_IV_STRIPPED))
1069                         return RX_CONTINUE;
1070                 /* Skip decryption if the frame is not protected. */
1071                 if (!ieee80211_has_protected(fc))
1072                         return RX_CONTINUE;
1073         } else if (mmie_keyidx >= 0) {
1074                 /* Broadcast/multicast robust management frame / BIP */
1075                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1076                     (status->flag & RX_FLAG_IV_STRIPPED))
1077                         return RX_CONTINUE;
1078
1079                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1080                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1081                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1082                 if (rx->sta)
1083                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1084                 if (!rx->key)
1085                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1086         } else if (!ieee80211_has_protected(fc)) {
1087                 /*
1088                  * The frame was not protected, so skip decryption. However, we
1089                  * need to set rx->key if there is a key that could have been
1090                  * used so that the frame may be dropped if encryption would
1091                  * have been expected.
1092                  */
1093                 struct ieee80211_key *key = NULL;
1094                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1095                 int i;
1096
1097                 if (ieee80211_is_mgmt(fc) &&
1098                     is_multicast_ether_addr(hdr->addr1) &&
1099                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1100                         rx->key = key;
1101                 else {
1102                         if (rx->sta) {
1103                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1104                                         key = rcu_dereference(rx->sta->gtk[i]);
1105                                         if (key)
1106                                                 break;
1107                                 }
1108                         }
1109                         if (!key) {
1110                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1111                                         key = rcu_dereference(sdata->keys[i]);
1112                                         if (key)
1113                                                 break;
1114                                 }
1115                         }
1116                         if (key)
1117                                 rx->key = key;
1118                 }
1119                 return RX_CONTINUE;
1120         } else {
1121                 u8 keyid;
1122                 /*
1123                  * The device doesn't give us the IV so we won't be
1124                  * able to look up the key. That's ok though, we
1125                  * don't need to decrypt the frame, we just won't
1126                  * be able to keep statistics accurate.
1127                  * Except for key threshold notifications, should
1128                  * we somehow allow the driver to tell us which key
1129                  * the hardware used if this flag is set?
1130                  */
1131                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1132                     (status->flag & RX_FLAG_IV_STRIPPED))
1133                         return RX_CONTINUE;
1134
1135                 hdrlen = ieee80211_hdrlen(fc);
1136
1137                 if (rx->skb->len < 8 + hdrlen)
1138                         return RX_DROP_UNUSABLE; /* TODO: count this? */
1139
1140                 /*
1141                  * no need to call ieee80211_wep_get_keyidx,
1142                  * it verifies a bunch of things we've done already
1143                  */
1144                 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1145                 keyidx = keyid >> 6;
1146
1147                 /* check per-station GTK first, if multicast packet */
1148                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1149                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1150
1151                 /* if not found, try default key */
1152                 if (!rx->key) {
1153                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1154
1155                         /*
1156                          * RSNA-protected unicast frames should always be
1157                          * sent with pairwise or station-to-station keys,
1158                          * but for WEP we allow using a key index as well.
1159                          */
1160                         if (rx->key &&
1161                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1162                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1163                             !is_multicast_ether_addr(hdr->addr1))
1164                                 rx->key = NULL;
1165                 }
1166         }
1167
1168         if (rx->key) {
1169                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1170                         return RX_DROP_MONITOR;
1171
1172                 rx->key->tx_rx_count++;
1173                 /* TODO: add threshold stuff again */
1174         } else {
1175                 return RX_DROP_MONITOR;
1176         }
1177
1178         switch (rx->key->conf.cipher) {
1179         case WLAN_CIPHER_SUITE_WEP40:
1180         case WLAN_CIPHER_SUITE_WEP104:
1181                 result = ieee80211_crypto_wep_decrypt(rx);
1182                 break;
1183         case WLAN_CIPHER_SUITE_TKIP:
1184                 result = ieee80211_crypto_tkip_decrypt(rx);
1185                 break;
1186         case WLAN_CIPHER_SUITE_CCMP:
1187                 result = ieee80211_crypto_ccmp_decrypt(rx);
1188                 break;
1189         case WLAN_CIPHER_SUITE_AES_CMAC:
1190                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1191                 break;
1192         default:
1193                 /*
1194                  * We can reach here only with HW-only algorithms
1195                  * but why didn't it decrypt the frame?!
1196                  */
1197                 return RX_DROP_UNUSABLE;
1198         }
1199
1200         /* the hdr variable is invalid after the decrypt handlers */
1201
1202         /* either the frame has been decrypted or will be dropped */
1203         status->flag |= RX_FLAG_DECRYPTED;
1204
1205         return result;
1206 }
1207
1208 static ieee80211_rx_result debug_noinline
1209 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1210 {
1211         struct ieee80211_local *local;
1212         struct ieee80211_hdr *hdr;
1213         struct sk_buff *skb;
1214
1215         local = rx->local;
1216         skb = rx->skb;
1217         hdr = (struct ieee80211_hdr *) skb->data;
1218
1219         if (!local->pspolling)
1220                 return RX_CONTINUE;
1221
1222         if (!ieee80211_has_fromds(hdr->frame_control))
1223                 /* this is not from AP */
1224                 return RX_CONTINUE;
1225
1226         if (!ieee80211_is_data(hdr->frame_control))
1227                 return RX_CONTINUE;
1228
1229         if (!ieee80211_has_moredata(hdr->frame_control)) {
1230                 /* AP has no more frames buffered for us */
1231                 local->pspolling = false;
1232                 return RX_CONTINUE;
1233         }
1234
1235         /* more data bit is set, let's request a new frame from the AP */
1236         ieee80211_send_pspoll(local, rx->sdata);
1237
1238         return RX_CONTINUE;
1239 }
1240
1241 static void sta_ps_start(struct sta_info *sta)
1242 {
1243         struct ieee80211_sub_if_data *sdata = sta->sdata;
1244         struct ieee80211_local *local = sdata->local;
1245         struct ps_data *ps;
1246
1247         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1248             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1249                 ps = &sdata->bss->ps;
1250         else
1251                 return;
1252
1253         atomic_inc(&ps->num_sta_ps);
1254         set_sta_flag(sta, WLAN_STA_PS_STA);
1255         if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1256                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1257         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1258                sta->sta.addr, sta->sta.aid);
1259 }
1260
1261 static void sta_ps_end(struct sta_info *sta)
1262 {
1263         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1264                sta->sta.addr, sta->sta.aid);
1265
1266         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1267                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1268                        sta->sta.addr, sta->sta.aid);
1269                 return;
1270         }
1271
1272         ieee80211_sta_ps_deliver_wakeup(sta);
1273 }
1274
1275 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1276 {
1277         struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1278         bool in_ps;
1279
1280         WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1281
1282         /* Don't let the same PS state be set twice */
1283         in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1284         if ((start && in_ps) || (!start && !in_ps))
1285                 return -EINVAL;
1286
1287         if (start)
1288                 sta_ps_start(sta_inf);
1289         else
1290                 sta_ps_end(sta_inf);
1291
1292         return 0;
1293 }
1294 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1295
1296 static ieee80211_rx_result debug_noinline
1297 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1298 {
1299         struct ieee80211_sub_if_data *sdata = rx->sdata;
1300         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1301         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1302         int tid, ac;
1303
1304         if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1305                 return RX_CONTINUE;
1306
1307         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1308             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1309                 return RX_CONTINUE;
1310
1311         /*
1312          * The device handles station powersave, so don't do anything about
1313          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1314          * it to mac80211 since they're handled.)
1315          */
1316         if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1317                 return RX_CONTINUE;
1318
1319         /*
1320          * Don't do anything if the station isn't already asleep. In
1321          * the uAPSD case, the station will probably be marked asleep,
1322          * in the PS-Poll case the station must be confused ...
1323          */
1324         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1325                 return RX_CONTINUE;
1326
1327         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1328                 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1329                         if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1330                                 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1331                         else
1332                                 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1333                 }
1334
1335                 /* Free PS Poll skb here instead of returning RX_DROP that would
1336                  * count as an dropped frame. */
1337                 dev_kfree_skb(rx->skb);
1338
1339                 return RX_QUEUED;
1340         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1341                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1342                    ieee80211_has_pm(hdr->frame_control) &&
1343                    (ieee80211_is_data_qos(hdr->frame_control) ||
1344                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1345                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1346                 ac = ieee802_1d_to_ac[tid & 7];
1347
1348                 /*
1349                  * If this AC is not trigger-enabled do nothing.
1350                  *
1351                  * NB: This could/should check a separate bitmap of trigger-
1352                  * enabled queues, but for now we only implement uAPSD w/o
1353                  * TSPEC changes to the ACs, so they're always the same.
1354                  */
1355                 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1356                         return RX_CONTINUE;
1357
1358                 /* if we are in a service period, do nothing */
1359                 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1360                         return RX_CONTINUE;
1361
1362                 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1363                         ieee80211_sta_ps_deliver_uapsd(rx->sta);
1364                 else
1365                         set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1366         }
1367
1368         return RX_CONTINUE;
1369 }
1370
1371 static ieee80211_rx_result debug_noinline
1372 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1373 {
1374         struct sta_info *sta = rx->sta;
1375         struct sk_buff *skb = rx->skb;
1376         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1377         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1378
1379         if (!sta)
1380                 return RX_CONTINUE;
1381
1382         /*
1383          * Update last_rx only for IBSS packets which are for the current
1384          * BSSID and for station already AUTHORIZED to avoid keeping the
1385          * current IBSS network alive in cases where other STAs start
1386          * using different BSSID. This will also give the station another
1387          * chance to restart the authentication/authorization in case
1388          * something went wrong the first time.
1389          */
1390         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1391                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1392                                                 NL80211_IFTYPE_ADHOC);
1393                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1394                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1395                         sta->last_rx = jiffies;
1396                         if (ieee80211_is_data(hdr->frame_control)) {
1397                                 sta->last_rx_rate_idx = status->rate_idx;
1398                                 sta->last_rx_rate_flag = status->flag;
1399                                 sta->last_rx_rate_vht_nss = status->vht_nss;
1400                         }
1401                 }
1402         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1403                 /*
1404                  * Mesh beacons will update last_rx when if they are found to
1405                  * match the current local configuration when processed.
1406                  */
1407                 sta->last_rx = jiffies;
1408                 if (ieee80211_is_data(hdr->frame_control)) {
1409                         sta->last_rx_rate_idx = status->rate_idx;
1410                         sta->last_rx_rate_flag = status->flag;
1411                         sta->last_rx_rate_vht_nss = status->vht_nss;
1412                 }
1413         }
1414
1415         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1416                 return RX_CONTINUE;
1417
1418         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1419                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1420
1421         sta->rx_fragments++;
1422         sta->rx_bytes += rx->skb->len;
1423         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1424                 sta->last_signal = status->signal;
1425                 ewma_add(&sta->avg_signal, -status->signal);
1426         }
1427
1428         /*
1429          * Change STA power saving mode only at the end of a frame
1430          * exchange sequence.
1431          */
1432         if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1433             !ieee80211_has_morefrags(hdr->frame_control) &&
1434             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1435             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1436              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1437                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1438                         /*
1439                          * Ignore doze->wake transitions that are
1440                          * indicated by non-data frames, the standard
1441                          * is unclear here, but for example going to
1442                          * PS mode and then scanning would cause a
1443                          * doze->wake transition for the probe request,
1444                          * and that is clearly undesirable.
1445                          */
1446                         if (ieee80211_is_data(hdr->frame_control) &&
1447                             !ieee80211_has_pm(hdr->frame_control))
1448                                 sta_ps_end(sta);
1449                 } else {
1450                         if (ieee80211_has_pm(hdr->frame_control))
1451                                 sta_ps_start(sta);
1452                 }
1453         }
1454
1455         /*
1456          * Drop (qos-)data::nullfunc frames silently, since they
1457          * are used only to control station power saving mode.
1458          */
1459         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1460             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1461                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1462
1463                 /*
1464                  * If we receive a 4-addr nullfunc frame from a STA
1465                  * that was not moved to a 4-addr STA vlan yet send
1466                  * the event to userspace and for older hostapd drop
1467                  * the frame to the monitor interface.
1468                  */
1469                 if (ieee80211_has_a4(hdr->frame_control) &&
1470                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1471                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1472                       !rx->sdata->u.vlan.sta))) {
1473                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1474                                 cfg80211_rx_unexpected_4addr_frame(
1475                                         rx->sdata->dev, sta->sta.addr,
1476                                         GFP_ATOMIC);
1477                         return RX_DROP_MONITOR;
1478                 }
1479                 /*
1480                  * Update counter and free packet here to avoid
1481                  * counting this as a dropped packed.
1482                  */
1483                 sta->rx_packets++;
1484                 dev_kfree_skb(rx->skb);
1485                 return RX_QUEUED;
1486         }
1487
1488         return RX_CONTINUE;
1489 } /* ieee80211_rx_h_sta_process */
1490
1491 static inline struct ieee80211_fragment_entry *
1492 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1493                          unsigned int frag, unsigned int seq, int rx_queue,
1494                          struct sk_buff **skb)
1495 {
1496         struct ieee80211_fragment_entry *entry;
1497
1498         entry = &sdata->fragments[sdata->fragment_next++];
1499         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1500                 sdata->fragment_next = 0;
1501
1502         if (!skb_queue_empty(&entry->skb_list))
1503                 __skb_queue_purge(&entry->skb_list);
1504
1505         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1506         *skb = NULL;
1507         entry->first_frag_time = jiffies;
1508         entry->seq = seq;
1509         entry->rx_queue = rx_queue;
1510         entry->last_frag = frag;
1511         entry->ccmp = 0;
1512         entry->extra_len = 0;
1513
1514         return entry;
1515 }
1516
1517 static inline struct ieee80211_fragment_entry *
1518 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1519                           unsigned int frag, unsigned int seq,
1520                           int rx_queue, struct ieee80211_hdr *hdr)
1521 {
1522         struct ieee80211_fragment_entry *entry;
1523         int i, idx;
1524
1525         idx = sdata->fragment_next;
1526         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1527                 struct ieee80211_hdr *f_hdr;
1528
1529                 idx--;
1530                 if (idx < 0)
1531                         idx = IEEE80211_FRAGMENT_MAX - 1;
1532
1533                 entry = &sdata->fragments[idx];
1534                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1535                     entry->rx_queue != rx_queue ||
1536                     entry->last_frag + 1 != frag)
1537                         continue;
1538
1539                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1540
1541                 /*
1542                  * Check ftype and addresses are equal, else check next fragment
1543                  */
1544                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1545                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1546                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1547                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1548                         continue;
1549
1550                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1551                         __skb_queue_purge(&entry->skb_list);
1552                         continue;
1553                 }
1554                 return entry;
1555         }
1556
1557         return NULL;
1558 }
1559
1560 static ieee80211_rx_result debug_noinline
1561 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1562 {
1563         struct ieee80211_hdr *hdr;
1564         u16 sc;
1565         __le16 fc;
1566         unsigned int frag, seq;
1567         struct ieee80211_fragment_entry *entry;
1568         struct sk_buff *skb;
1569         struct ieee80211_rx_status *status;
1570
1571         hdr = (struct ieee80211_hdr *)rx->skb->data;
1572         fc = hdr->frame_control;
1573
1574         if (ieee80211_is_ctl(fc))
1575                 return RX_CONTINUE;
1576
1577         sc = le16_to_cpu(hdr->seq_ctrl);
1578         frag = sc & IEEE80211_SCTL_FRAG;
1579
1580         if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1581                    is_multicast_ether_addr(hdr->addr1))) {
1582                 /* not fragmented */
1583                 goto out;
1584         }
1585         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1586
1587         if (skb_linearize(rx->skb))
1588                 return RX_DROP_UNUSABLE;
1589
1590         /*
1591          *  skb_linearize() might change the skb->data and
1592          *  previously cached variables (in this case, hdr) need to
1593          *  be refreshed with the new data.
1594          */
1595         hdr = (struct ieee80211_hdr *)rx->skb->data;
1596         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1597
1598         if (frag == 0) {
1599                 /* This is the first fragment of a new frame. */
1600                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1601                                                  rx->seqno_idx, &(rx->skb));
1602                 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1603                     ieee80211_has_protected(fc)) {
1604                         int queue = rx->security_idx;
1605                         /* Store CCMP PN so that we can verify that the next
1606                          * fragment has a sequential PN value. */
1607                         entry->ccmp = 1;
1608                         memcpy(entry->last_pn,
1609                                rx->key->u.ccmp.rx_pn[queue],
1610                                CCMP_PN_LEN);
1611                 }
1612                 return RX_QUEUED;
1613         }
1614
1615         /* This is a fragment for a frame that should already be pending in
1616          * fragment cache. Add this fragment to the end of the pending entry.
1617          */
1618         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1619                                           rx->seqno_idx, hdr);
1620         if (!entry) {
1621                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1622                 return RX_DROP_MONITOR;
1623         }
1624
1625         /* Verify that MPDUs within one MSDU have sequential PN values.
1626          * (IEEE 802.11i, 8.3.3.4.5) */
1627         if (entry->ccmp) {
1628                 int i;
1629                 u8 pn[CCMP_PN_LEN], *rpn;
1630                 int queue;
1631                 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1632                         return RX_DROP_UNUSABLE;
1633                 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1634                 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1635                         pn[i]++;
1636                         if (pn[i])
1637                                 break;
1638                 }
1639                 queue = rx->security_idx;
1640                 rpn = rx->key->u.ccmp.rx_pn[queue];
1641                 if (memcmp(pn, rpn, CCMP_PN_LEN))
1642                         return RX_DROP_UNUSABLE;
1643                 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1644         }
1645
1646         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1647         __skb_queue_tail(&entry->skb_list, rx->skb);
1648         entry->last_frag = frag;
1649         entry->extra_len += rx->skb->len;
1650         if (ieee80211_has_morefrags(fc)) {
1651                 rx->skb = NULL;
1652                 return RX_QUEUED;
1653         }
1654
1655         rx->skb = __skb_dequeue(&entry->skb_list);
1656         if (skb_tailroom(rx->skb) < entry->extra_len) {
1657                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1658                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1659                                               GFP_ATOMIC))) {
1660                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1661                         __skb_queue_purge(&entry->skb_list);
1662                         return RX_DROP_UNUSABLE;
1663                 }
1664         }
1665         while ((skb = __skb_dequeue(&entry->skb_list))) {
1666                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1667                 dev_kfree_skb(skb);
1668         }
1669
1670         /* Complete frame has been reassembled - process it now */
1671         status = IEEE80211_SKB_RXCB(rx->skb);
1672         status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1673
1674  out:
1675         if (rx->sta)
1676                 rx->sta->rx_packets++;
1677         if (is_multicast_ether_addr(hdr->addr1))
1678                 rx->local->dot11MulticastReceivedFrameCount++;
1679         else
1680                 ieee80211_led_rx(rx->local);
1681         return RX_CONTINUE;
1682 }
1683
1684 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1685 {
1686         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1687                 return -EACCES;
1688
1689         return 0;
1690 }
1691
1692 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1693 {
1694         struct sk_buff *skb = rx->skb;
1695         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1696
1697         /*
1698          * Pass through unencrypted frames if the hardware has
1699          * decrypted them already.
1700          */
1701         if (status->flag & RX_FLAG_DECRYPTED)
1702                 return 0;
1703
1704         /* Drop unencrypted frames if key is set. */
1705         if (unlikely(!ieee80211_has_protected(fc) &&
1706                      !ieee80211_is_nullfunc(fc) &&
1707                      ieee80211_is_data(fc) &&
1708                      (rx->key || rx->sdata->drop_unencrypted)))
1709                 return -EACCES;
1710
1711         return 0;
1712 }
1713
1714 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1715 {
1716         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1717         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1718         __le16 fc = hdr->frame_control;
1719
1720         /*
1721          * Pass through unencrypted frames if the hardware has
1722          * decrypted them already.
1723          */
1724         if (status->flag & RX_FLAG_DECRYPTED)
1725                 return 0;
1726
1727         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1728                 if (unlikely(!ieee80211_has_protected(fc) &&
1729                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1730                              rx->key)) {
1731                         if (ieee80211_is_deauth(fc))
1732                                 cfg80211_send_unprot_deauth(rx->sdata->dev,
1733                                                             rx->skb->data,
1734                                                             rx->skb->len);
1735                         else if (ieee80211_is_disassoc(fc))
1736                                 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1737                                                               rx->skb->data,
1738                                                               rx->skb->len);
1739                         return -EACCES;
1740                 }
1741                 /* BIP does not use Protected field, so need to check MMIE */
1742                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1743                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1744                         if (ieee80211_is_deauth(fc))
1745                                 cfg80211_send_unprot_deauth(rx->sdata->dev,
1746                                                             rx->skb->data,
1747                                                             rx->skb->len);
1748                         else if (ieee80211_is_disassoc(fc))
1749                                 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1750                                                               rx->skb->data,
1751                                                               rx->skb->len);
1752                         return -EACCES;
1753                 }
1754                 /*
1755                  * When using MFP, Action frames are not allowed prior to
1756                  * having configured keys.
1757                  */
1758                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1759                              ieee80211_is_robust_mgmt_frame(
1760                                      (struct ieee80211_hdr *) rx->skb->data)))
1761                         return -EACCES;
1762         }
1763
1764         return 0;
1765 }
1766
1767 static int
1768 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1769 {
1770         struct ieee80211_sub_if_data *sdata = rx->sdata;
1771         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1772         bool check_port_control = false;
1773         struct ethhdr *ehdr;
1774         int ret;
1775
1776         *port_control = false;
1777         if (ieee80211_has_a4(hdr->frame_control) &&
1778             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1779                 return -1;
1780
1781         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1782             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1783
1784                 if (!sdata->u.mgd.use_4addr)
1785                         return -1;
1786                 else
1787                         check_port_control = true;
1788         }
1789
1790         if (is_multicast_ether_addr(hdr->addr1) &&
1791             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1792                 return -1;
1793
1794         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1795         if (ret < 0)
1796                 return ret;
1797
1798         ehdr = (struct ethhdr *) rx->skb->data;
1799         if (ehdr->h_proto == rx->sdata->control_port_protocol)
1800                 *port_control = true;
1801         else if (check_port_control)
1802                 return -1;
1803
1804         return 0;
1805 }
1806
1807 /*
1808  * requires that rx->skb is a frame with ethernet header
1809  */
1810 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1811 {
1812         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1813                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1814         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1815
1816         /*
1817          * Allow EAPOL frames to us/the PAE group address regardless
1818          * of whether the frame was encrypted or not.
1819          */
1820         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1821             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1822              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
1823                 return true;
1824
1825         if (ieee80211_802_1x_port_control(rx) ||
1826             ieee80211_drop_unencrypted(rx, fc))
1827                 return false;
1828
1829         return true;
1830 }
1831
1832 /*
1833  * requires that rx->skb is a frame with ethernet header
1834  */
1835 static void
1836 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1837 {
1838         struct ieee80211_sub_if_data *sdata = rx->sdata;
1839         struct net_device *dev = sdata->dev;
1840         struct sk_buff *skb, *xmit_skb;
1841         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1842         struct sta_info *dsta;
1843         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1844
1845         skb = rx->skb;
1846         xmit_skb = NULL;
1847
1848         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1849              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1850             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1851             (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1852             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1853                 if (is_multicast_ether_addr(ehdr->h_dest)) {
1854                         /*
1855                          * send multicast frames both to higher layers in
1856                          * local net stack and back to the wireless medium
1857                          */
1858                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
1859                         if (!xmit_skb)
1860                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
1861                                                     dev->name);
1862                 } else {
1863                         dsta = sta_info_get(sdata, skb->data);
1864                         if (dsta) {
1865                                 /*
1866                                  * The destination station is associated to
1867                                  * this AP (in this VLAN), so send the frame
1868                                  * directly to it and do not pass it to local
1869                                  * net stack.
1870                                  */
1871                                 xmit_skb = skb;
1872                                 skb = NULL;
1873                         }
1874                 }
1875         }
1876
1877         if (skb) {
1878                 int align __maybe_unused;
1879
1880 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1881                 /*
1882                  * 'align' will only take the values 0 or 2 here
1883                  * since all frames are required to be aligned
1884                  * to 2-byte boundaries when being passed to
1885                  * mac80211. That also explains the __skb_push()
1886                  * below.
1887                  */
1888                 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1889                 if (align) {
1890                         if (WARN_ON(skb_headroom(skb) < 3)) {
1891                                 dev_kfree_skb(skb);
1892                                 skb = NULL;
1893                         } else {
1894                                 u8 *data = skb->data;
1895                                 size_t len = skb_headlen(skb);
1896                                 skb->data -= align;
1897                                 memmove(skb->data, data, len);
1898                                 skb_set_tail_pointer(skb, len);
1899                         }
1900                 }
1901 #endif
1902
1903                 if (skb) {
1904                         /* deliver to local stack */
1905                         skb->protocol = eth_type_trans(skb, dev);
1906                         memset(skb->cb, 0, sizeof(skb->cb));
1907                         netif_receive_skb(skb);
1908                 }
1909         }
1910
1911         if (xmit_skb) {
1912                 /*
1913                  * Send to wireless media and increase priority by 256 to
1914                  * keep the received priority instead of reclassifying
1915                  * the frame (see cfg80211_classify8021d).
1916                  */
1917                 xmit_skb->priority += 256;
1918                 xmit_skb->protocol = htons(ETH_P_802_3);
1919                 skb_reset_network_header(xmit_skb);
1920                 skb_reset_mac_header(xmit_skb);
1921                 dev_queue_xmit(xmit_skb);
1922         }
1923 }
1924
1925 static ieee80211_rx_result debug_noinline
1926 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1927 {
1928         struct net_device *dev = rx->sdata->dev;
1929         struct sk_buff *skb = rx->skb;
1930         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1931         __le16 fc = hdr->frame_control;
1932         struct sk_buff_head frame_list;
1933         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1934
1935         if (unlikely(!ieee80211_is_data(fc)))
1936                 return RX_CONTINUE;
1937
1938         if (unlikely(!ieee80211_is_data_present(fc)))
1939                 return RX_DROP_MONITOR;
1940
1941         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1942                 return RX_CONTINUE;
1943
1944         if (ieee80211_has_a4(hdr->frame_control) &&
1945             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1946             !rx->sdata->u.vlan.sta)
1947                 return RX_DROP_UNUSABLE;
1948
1949         if (is_multicast_ether_addr(hdr->addr1) &&
1950             ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1951               rx->sdata->u.vlan.sta) ||
1952              (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1953               rx->sdata->u.mgd.use_4addr)))
1954                 return RX_DROP_UNUSABLE;
1955
1956         skb->dev = dev;
1957         __skb_queue_head_init(&frame_list);
1958
1959         if (skb_linearize(skb))
1960                 return RX_DROP_UNUSABLE;
1961
1962         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1963                                  rx->sdata->vif.type,
1964                                  rx->local->hw.extra_tx_headroom, true);
1965
1966         while (!skb_queue_empty(&frame_list)) {
1967                 rx->skb = __skb_dequeue(&frame_list);
1968
1969                 if (!ieee80211_frame_allowed(rx, fc)) {
1970                         dev_kfree_skb(rx->skb);
1971                         continue;
1972                 }
1973                 dev->stats.rx_packets++;
1974                 dev->stats.rx_bytes += rx->skb->len;
1975
1976                 ieee80211_deliver_skb(rx);
1977         }
1978
1979         return RX_QUEUED;
1980 }
1981
1982 #ifdef CONFIG_MAC80211_MESH
1983 static ieee80211_rx_result
1984 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1985 {
1986         struct ieee80211_hdr *fwd_hdr, *hdr;
1987         struct ieee80211_tx_info *info;
1988         struct ieee80211s_hdr *mesh_hdr;
1989         struct sk_buff *skb = rx->skb, *fwd_skb;
1990         struct ieee80211_local *local = rx->local;
1991         struct ieee80211_sub_if_data *sdata = rx->sdata;
1992         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1993         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1994         __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
1995         u16 q, hdrlen;
1996
1997         hdr = (struct ieee80211_hdr *) skb->data;
1998         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1999
2000         /* make sure fixed part of mesh header is there, also checks skb len */
2001         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2002                 return RX_DROP_MONITOR;
2003
2004         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2005
2006         /* make sure full mesh header is there, also checks skb len */
2007         if (!pskb_may_pull(rx->skb,
2008                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2009                 return RX_DROP_MONITOR;
2010
2011         /* reload pointers */
2012         hdr = (struct ieee80211_hdr *) skb->data;
2013         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2014
2015         /* frame is in RMC, don't forward */
2016         if (ieee80211_is_data(hdr->frame_control) &&
2017             is_multicast_ether_addr(hdr->addr1) &&
2018             mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
2019                 return RX_DROP_MONITOR;
2020
2021         if (!ieee80211_is_data(hdr->frame_control) ||
2022             !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2023                 return RX_CONTINUE;
2024
2025         if (!mesh_hdr->ttl)
2026                 return RX_DROP_MONITOR;
2027
2028         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2029                 struct mesh_path *mppath;
2030                 char *proxied_addr;
2031                 char *mpp_addr;
2032
2033                 if (is_multicast_ether_addr(hdr->addr1)) {
2034                         mpp_addr = hdr->addr3;
2035                         proxied_addr = mesh_hdr->eaddr1;
2036                 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2037                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2038                         mpp_addr = hdr->addr4;
2039                         proxied_addr = mesh_hdr->eaddr2;
2040                 } else {
2041                         return RX_DROP_MONITOR;
2042                 }
2043
2044                 rcu_read_lock();
2045                 mppath = mpp_path_lookup(proxied_addr, sdata);
2046                 if (!mppath) {
2047                         mpp_path_add(proxied_addr, mpp_addr, sdata);
2048                 } else {
2049                         spin_lock_bh(&mppath->state_lock);
2050                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2051                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2052                         spin_unlock_bh(&mppath->state_lock);
2053                 }
2054                 rcu_read_unlock();
2055         }
2056
2057         /* Frame has reached destination.  Don't forward */
2058         if (!is_multicast_ether_addr(hdr->addr1) &&
2059             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2060                 return RX_CONTINUE;
2061
2062         q = ieee80211_select_queue_80211(sdata, skb, hdr);
2063         if (ieee80211_queue_stopped(&local->hw, q)) {
2064                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2065                 return RX_DROP_MONITOR;
2066         }
2067         skb_set_queue_mapping(skb, q);
2068
2069         if (!--mesh_hdr->ttl) {
2070                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2071                 goto out;
2072         }
2073
2074         if (!ifmsh->mshcfg.dot11MeshForwarding)
2075                 goto out;
2076
2077         fwd_skb = skb_copy(skb, GFP_ATOMIC);
2078         if (!fwd_skb) {
2079                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2080                                     sdata->name);
2081                 goto out;
2082         }
2083
2084         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2085         info = IEEE80211_SKB_CB(fwd_skb);
2086         memset(info, 0, sizeof(*info));
2087         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2088         info->control.vif = &rx->sdata->vif;
2089         info->control.jiffies = jiffies;
2090         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2091                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2092                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2093         } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
2094                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2095         } else {
2096                 /* unable to resolve next hop */
2097                 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
2098                                    0, reason, fwd_hdr->addr2, sdata);
2099                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2100                 kfree_skb(fwd_skb);
2101                 return RX_DROP_MONITOR;
2102         }
2103
2104         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2105         ieee80211_add_pending_skb(local, fwd_skb);
2106  out:
2107         if (is_multicast_ether_addr(hdr->addr1) ||
2108             sdata->dev->flags & IFF_PROMISC)
2109                 return RX_CONTINUE;
2110         else
2111                 return RX_DROP_MONITOR;
2112 }
2113 #endif
2114
2115 static ieee80211_rx_result debug_noinline
2116 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2117 {
2118         struct ieee80211_sub_if_data *sdata = rx->sdata;
2119         struct ieee80211_local *local = rx->local;
2120         struct net_device *dev = sdata->dev;
2121         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2122         __le16 fc = hdr->frame_control;
2123         bool port_control;
2124         int err;
2125
2126         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2127                 return RX_CONTINUE;
2128
2129         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2130                 return RX_DROP_MONITOR;
2131
2132         /*
2133          * Send unexpected-4addr-frame event to hostapd. For older versions,
2134          * also drop the frame to cooked monitor interfaces.
2135          */
2136         if (ieee80211_has_a4(hdr->frame_control) &&
2137             sdata->vif.type == NL80211_IFTYPE_AP) {
2138                 if (rx->sta &&
2139                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2140                         cfg80211_rx_unexpected_4addr_frame(
2141                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2142                 return RX_DROP_MONITOR;
2143         }
2144
2145         err = __ieee80211_data_to_8023(rx, &port_control);
2146         if (unlikely(err))
2147                 return RX_DROP_UNUSABLE;
2148
2149         if (!ieee80211_frame_allowed(rx, fc))
2150                 return RX_DROP_MONITOR;
2151
2152         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2153             unlikely(port_control) && sdata->bss) {
2154                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2155                                      u.ap);
2156                 dev = sdata->dev;
2157                 rx->sdata = sdata;
2158         }
2159
2160         rx->skb->dev = dev;
2161
2162         dev->stats.rx_packets++;
2163         dev->stats.rx_bytes += rx->skb->len;
2164
2165         if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2166             !is_multicast_ether_addr(
2167                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2168             (!local->scanning &&
2169              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2170                         mod_timer(&local->dynamic_ps_timer, jiffies +
2171                          msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2172         }
2173
2174         ieee80211_deliver_skb(rx);
2175
2176         return RX_QUEUED;
2177 }
2178
2179 static ieee80211_rx_result debug_noinline
2180 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
2181 {
2182         struct sk_buff *skb = rx->skb;
2183         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2184         struct tid_ampdu_rx *tid_agg_rx;
2185         u16 start_seq_num;
2186         u16 tid;
2187
2188         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2189                 return RX_CONTINUE;
2190
2191         if (ieee80211_is_back_req(bar->frame_control)) {
2192                 struct {
2193                         __le16 control, start_seq_num;
2194                 } __packed bar_data;
2195
2196                 if (!rx->sta)
2197                         return RX_DROP_MONITOR;
2198
2199                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2200                                   &bar_data, sizeof(bar_data)))
2201                         return RX_DROP_MONITOR;
2202
2203                 tid = le16_to_cpu(bar_data.control) >> 12;
2204
2205                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2206                 if (!tid_agg_rx)
2207                         return RX_DROP_MONITOR;
2208
2209                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2210
2211                 /* reset session timer */
2212                 if (tid_agg_rx->timeout)
2213                         mod_timer(&tid_agg_rx->session_timer,
2214                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2215
2216                 spin_lock(&tid_agg_rx->reorder_lock);
2217                 /* release stored frames up to start of BAR */
2218                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2219                                                  start_seq_num);
2220                 spin_unlock(&tid_agg_rx->reorder_lock);
2221
2222                 kfree_skb(skb);
2223                 return RX_QUEUED;
2224         }
2225
2226         /*
2227          * After this point, we only want management frames,
2228          * so we can drop all remaining control frames to
2229          * cooked monitor interfaces.
2230          */
2231         return RX_DROP_MONITOR;
2232 }
2233
2234 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2235                                            struct ieee80211_mgmt *mgmt,
2236                                            size_t len)
2237 {
2238         struct ieee80211_local *local = sdata->local;
2239         struct sk_buff *skb;
2240         struct ieee80211_mgmt *resp;
2241
2242         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2243                 /* Not to own unicast address */
2244                 return;
2245         }
2246
2247         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2248             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2249                 /* Not from the current AP or not associated yet. */
2250                 return;
2251         }
2252
2253         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2254                 /* Too short SA Query request frame */
2255                 return;
2256         }
2257
2258         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2259         if (skb == NULL)
2260                 return;
2261
2262         skb_reserve(skb, local->hw.extra_tx_headroom);
2263         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2264         memset(resp, 0, 24);
2265         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2266         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2267         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2268         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2269                                           IEEE80211_STYPE_ACTION);
2270         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2271         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2272         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2273         memcpy(resp->u.action.u.sa_query.trans_id,
2274                mgmt->u.action.u.sa_query.trans_id,
2275                WLAN_SA_QUERY_TR_ID_LEN);
2276
2277         ieee80211_tx_skb(sdata, skb);
2278 }
2279
2280 static ieee80211_rx_result debug_noinline
2281 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2282 {
2283         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2284         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2285
2286         /*
2287          * From here on, look only at management frames.
2288          * Data and control frames are already handled,
2289          * and unknown (reserved) frames are useless.
2290          */
2291         if (rx->skb->len < 24)
2292                 return RX_DROP_MONITOR;
2293
2294         if (!ieee80211_is_mgmt(mgmt->frame_control))
2295                 return RX_DROP_MONITOR;
2296
2297         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2298             ieee80211_is_beacon(mgmt->frame_control) &&
2299             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2300                 int sig = 0;
2301
2302                 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2303                         sig = status->signal;
2304
2305                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2306                                             rx->skb->data, rx->skb->len,
2307                                             status->freq, sig);
2308                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2309         }
2310
2311         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2312                 return RX_DROP_MONITOR;
2313
2314         if (ieee80211_drop_unencrypted_mgmt(rx))
2315                 return RX_DROP_UNUSABLE;
2316
2317         return RX_CONTINUE;
2318 }
2319
2320 static ieee80211_rx_result debug_noinline
2321 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2322 {
2323         struct ieee80211_local *local = rx->local;
2324         struct ieee80211_sub_if_data *sdata = rx->sdata;
2325         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2326         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2327         int len = rx->skb->len;
2328
2329         if (!ieee80211_is_action(mgmt->frame_control))
2330                 return RX_CONTINUE;
2331
2332         /* drop too small frames */
2333         if (len < IEEE80211_MIN_ACTION_SIZE)
2334                 return RX_DROP_UNUSABLE;
2335
2336         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2337             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED)
2338                 return RX_DROP_UNUSABLE;
2339
2340         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2341                 return RX_DROP_UNUSABLE;
2342
2343         switch (mgmt->u.action.category) {
2344         case WLAN_CATEGORY_HT:
2345                 /* reject HT action frames from stations not supporting HT */
2346                 if (!rx->sta->sta.ht_cap.ht_supported)
2347                         goto invalid;
2348
2349                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2350                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2351                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2352                     sdata->vif.type != NL80211_IFTYPE_AP &&
2353                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2354                         break;
2355
2356                 /* verify action & smps_control are present */
2357                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2358                         goto invalid;
2359
2360                 switch (mgmt->u.action.u.ht_smps.action) {
2361                 case WLAN_HT_ACTION_SMPS: {
2362                         struct ieee80211_supported_band *sband;
2363                         u8 smps;
2364
2365                         /* convert to HT capability */
2366                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2367                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2368                                 smps = WLAN_HT_CAP_SM_PS_DISABLED;
2369                                 break;
2370                         case WLAN_HT_SMPS_CONTROL_STATIC:
2371                                 smps = WLAN_HT_CAP_SM_PS_STATIC;
2372                                 break;
2373                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2374                                 smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2375                                 break;
2376                         default:
2377                                 goto invalid;
2378                         }
2379                         smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2380
2381                         /* if no change do nothing */
2382                         if ((rx->sta->sta.ht_cap.cap &
2383                                         IEEE80211_HT_CAP_SM_PS) == smps)
2384                                 goto handled;
2385
2386                         rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2387                         rx->sta->sta.ht_cap.cap |= smps;
2388
2389                         sband = rx->local->hw.wiphy->bands[status->band];
2390
2391                         rate_control_rate_update(local, sband, rx->sta,
2392                                                  IEEE80211_RC_SMPS_CHANGED);
2393                         goto handled;
2394                 }
2395                 default:
2396                         goto invalid;
2397                 }
2398
2399                 break;
2400         case WLAN_CATEGORY_BACK:
2401                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2402                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2403                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2404                     sdata->vif.type != NL80211_IFTYPE_AP &&
2405                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2406                         break;
2407
2408                 /* verify action_code is present */
2409                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2410                         break;
2411
2412                 switch (mgmt->u.action.u.addba_req.action_code) {
2413                 case WLAN_ACTION_ADDBA_REQ:
2414                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2415                                    sizeof(mgmt->u.action.u.addba_req)))
2416                                 goto invalid;
2417                         break;
2418                 case WLAN_ACTION_ADDBA_RESP:
2419                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2420                                    sizeof(mgmt->u.action.u.addba_resp)))
2421                                 goto invalid;
2422                         break;
2423                 case WLAN_ACTION_DELBA:
2424                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2425                                    sizeof(mgmt->u.action.u.delba)))
2426                                 goto invalid;
2427                         break;
2428                 default:
2429                         goto invalid;
2430                 }
2431
2432                 goto queue;
2433         case WLAN_CATEGORY_SPECTRUM_MGMT:
2434                 if (status->band != IEEE80211_BAND_5GHZ)
2435                         break;
2436
2437                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2438                         break;
2439
2440                 /* verify action_code is present */
2441                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2442                         break;
2443
2444                 switch (mgmt->u.action.u.measurement.action_code) {
2445                 case WLAN_ACTION_SPCT_MSR_REQ:
2446                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2447                                    sizeof(mgmt->u.action.u.measurement)))
2448                                 break;
2449                         ieee80211_process_measurement_req(sdata, mgmt, len);
2450                         goto handled;
2451                 case WLAN_ACTION_SPCT_CHL_SWITCH:
2452                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2453                                    sizeof(mgmt->u.action.u.chan_switch)))
2454                                 break;
2455
2456                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2457                                 break;
2458
2459                         if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2460                                 break;
2461
2462                         goto queue;
2463                 }
2464                 break;
2465         case WLAN_CATEGORY_SA_QUERY:
2466                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2467                            sizeof(mgmt->u.action.u.sa_query)))
2468                         break;
2469
2470                 switch (mgmt->u.action.u.sa_query.action) {
2471                 case WLAN_ACTION_SA_QUERY_REQUEST:
2472                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2473                                 break;
2474                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2475                         goto handled;
2476                 }
2477                 break;
2478         case WLAN_CATEGORY_SELF_PROTECTED:
2479                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2480                            sizeof(mgmt->u.action.u.self_prot.action_code)))
2481                         break;
2482
2483                 switch (mgmt->u.action.u.self_prot.action_code) {
2484                 case WLAN_SP_MESH_PEERING_OPEN:
2485                 case WLAN_SP_MESH_PEERING_CLOSE:
2486                 case WLAN_SP_MESH_PEERING_CONFIRM:
2487                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2488                                 goto invalid;
2489                         if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2490                                 /* userspace handles this frame */
2491                                 break;
2492                         goto queue;
2493                 case WLAN_SP_MGK_INFORM:
2494                 case WLAN_SP_MGK_ACK:
2495                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2496                                 goto invalid;
2497                         break;
2498                 }
2499                 break;
2500         case WLAN_CATEGORY_MESH_ACTION:
2501                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2502                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
2503                         break;
2504
2505                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2506                         break;
2507                 if (mesh_action_is_path_sel(mgmt) &&
2508                     !mesh_path_sel_is_hwmp(sdata))
2509                         break;
2510                 goto queue;
2511         }
2512
2513         return RX_CONTINUE;
2514
2515  invalid:
2516         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2517         /* will return in the next handlers */
2518         return RX_CONTINUE;
2519
2520  handled:
2521         if (rx->sta)
2522                 rx->sta->rx_packets++;
2523         dev_kfree_skb(rx->skb);
2524         return RX_QUEUED;
2525
2526  queue:
2527         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2528         skb_queue_tail(&sdata->skb_queue, rx->skb);
2529         ieee80211_queue_work(&local->hw, &sdata->work);
2530         if (rx->sta)
2531                 rx->sta->rx_packets++;
2532         return RX_QUEUED;
2533 }
2534
2535 static ieee80211_rx_result debug_noinline
2536 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2537 {
2538         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2539         int sig = 0;
2540
2541         /* skip known-bad action frames and return them in the next handler */
2542         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2543                 return RX_CONTINUE;
2544
2545         /*
2546          * Getting here means the kernel doesn't know how to handle
2547          * it, but maybe userspace does ... include returned frames
2548          * so userspace can register for those to know whether ones
2549          * it transmitted were processed or returned.
2550          */
2551
2552         if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2553                 sig = status->signal;
2554
2555         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2556                              rx->skb->data, rx->skb->len,
2557                              GFP_ATOMIC)) {
2558                 if (rx->sta)
2559                         rx->sta->rx_packets++;
2560                 dev_kfree_skb(rx->skb);
2561                 return RX_QUEUED;
2562         }
2563
2564         return RX_CONTINUE;
2565 }
2566
2567 static ieee80211_rx_result debug_noinline
2568 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2569 {
2570         struct ieee80211_local *local = rx->local;
2571         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2572         struct sk_buff *nskb;
2573         struct ieee80211_sub_if_data *sdata = rx->sdata;
2574         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2575
2576         if (!ieee80211_is_action(mgmt->frame_control))
2577                 return RX_CONTINUE;
2578
2579         /*
2580          * For AP mode, hostapd is responsible for handling any action
2581          * frames that we didn't handle, including returning unknown
2582          * ones. For all other modes we will return them to the sender,
2583          * setting the 0x80 bit in the action category, as required by
2584          * 802.11-2012 9.24.4.
2585          * Newer versions of hostapd shall also use the management frame
2586          * registration mechanisms, but older ones still use cooked
2587          * monitor interfaces so push all frames there.
2588          */
2589         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2590             (sdata->vif.type == NL80211_IFTYPE_AP ||
2591              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2592                 return RX_DROP_MONITOR;
2593
2594         if (is_multicast_ether_addr(mgmt->da))
2595                 return RX_DROP_MONITOR;
2596
2597         /* do not return rejected action frames */
2598         if (mgmt->u.action.category & 0x80)
2599                 return RX_DROP_UNUSABLE;
2600
2601         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2602                                GFP_ATOMIC);
2603         if (nskb) {
2604                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2605
2606                 nmgmt->u.action.category |= 0x80;
2607                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2608                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2609
2610                 memset(nskb->cb, 0, sizeof(nskb->cb));
2611
2612                 ieee80211_tx_skb(rx->sdata, nskb);
2613         }
2614         dev_kfree_skb(rx->skb);
2615         return RX_QUEUED;
2616 }
2617
2618 static ieee80211_rx_result debug_noinline
2619 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2620 {
2621         struct ieee80211_sub_if_data *sdata = rx->sdata;
2622         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2623         __le16 stype;
2624
2625         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2626
2627         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2628             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2629             sdata->vif.type != NL80211_IFTYPE_STATION)
2630                 return RX_DROP_MONITOR;
2631
2632         switch (stype) {
2633         case cpu_to_le16(IEEE80211_STYPE_AUTH):
2634         case cpu_to_le16(IEEE80211_STYPE_BEACON):
2635         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2636                 /* process for all: mesh, mlme, ibss */
2637                 break;
2638         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2639         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2640         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2641         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2642                 if (is_multicast_ether_addr(mgmt->da) &&
2643                     !is_broadcast_ether_addr(mgmt->da))
2644                         return RX_DROP_MONITOR;
2645
2646                 /* process only for station */
2647                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2648                         return RX_DROP_MONITOR;
2649                 break;
2650         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2651                 /* process only for ibss */
2652                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2653                         return RX_DROP_MONITOR;
2654                 break;
2655         default:
2656                 return RX_DROP_MONITOR;
2657         }
2658
2659         /* queue up frame and kick off work to process it */
2660         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2661         skb_queue_tail(&sdata->skb_queue, rx->skb);
2662         ieee80211_queue_work(&rx->local->hw, &sdata->work);
2663         if (rx->sta)
2664                 rx->sta->rx_packets++;
2665
2666         return RX_QUEUED;
2667 }
2668
2669 /* TODO: use IEEE80211_RX_FRAGMENTED */
2670 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2671                                         struct ieee80211_rate *rate)
2672 {
2673         struct ieee80211_sub_if_data *sdata;
2674         struct ieee80211_local *local = rx->local;
2675         struct sk_buff *skb = rx->skb, *skb2;
2676         struct net_device *prev_dev = NULL;
2677         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2678         int needed_headroom;
2679
2680         /*
2681          * If cooked monitor has been processed already, then
2682          * don't do it again. If not, set the flag.
2683          */
2684         if (rx->flags & IEEE80211_RX_CMNTR)
2685                 goto out_free_skb;
2686         rx->flags |= IEEE80211_RX_CMNTR;
2687
2688         /* If there are no cooked monitor interfaces, just free the SKB */
2689         if (!local->cooked_mntrs)
2690                 goto out_free_skb;
2691
2692         /* room for the radiotap header based on driver features */
2693         needed_headroom = ieee80211_rx_radiotap_space(local, status);
2694
2695         if (skb_headroom(skb) < needed_headroom &&
2696             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2697                 goto out_free_skb;
2698
2699         /* prepend radiotap information */
2700         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2701                                          false);
2702
2703         skb_set_mac_header(skb, 0);
2704         skb->ip_summed = CHECKSUM_UNNECESSARY;
2705         skb->pkt_type = PACKET_OTHERHOST;
2706         skb->protocol = htons(ETH_P_802_2);
2707
2708         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2709                 if (!ieee80211_sdata_running(sdata))
2710                         continue;
2711
2712                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2713                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2714                         continue;
2715
2716                 if (prev_dev) {
2717                         skb2 = skb_clone(skb, GFP_ATOMIC);
2718                         if (skb2) {
2719                                 skb2->dev = prev_dev;
2720                                 netif_receive_skb(skb2);
2721                         }
2722                 }
2723
2724                 prev_dev = sdata->dev;
2725                 sdata->dev->stats.rx_packets++;
2726                 sdata->dev->stats.rx_bytes += skb->len;
2727         }
2728
2729         if (prev_dev) {
2730                 skb->dev = prev_dev;
2731                 netif_receive_skb(skb);
2732                 return;
2733         }
2734
2735  out_free_skb:
2736         dev_kfree_skb(skb);
2737 }
2738
2739 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2740                                          ieee80211_rx_result res)
2741 {
2742         switch (res) {
2743         case RX_DROP_MONITOR:
2744                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2745                 if (rx->sta)
2746                         rx->sta->rx_dropped++;
2747                 /* fall through */
2748         case RX_CONTINUE: {
2749                 struct ieee80211_rate *rate = NULL;
2750                 struct ieee80211_supported_band *sband;
2751                 struct ieee80211_rx_status *status;
2752
2753                 status = IEEE80211_SKB_RXCB((rx->skb));
2754
2755                 sband = rx->local->hw.wiphy->bands[status->band];
2756                 if (!(status->flag & RX_FLAG_HT) &&
2757                     !(status->flag & RX_FLAG_VHT))
2758                         rate = &sband->bitrates[status->rate_idx];
2759
2760                 ieee80211_rx_cooked_monitor(rx, rate);
2761                 break;
2762                 }
2763         case RX_DROP_UNUSABLE:
2764                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2765                 if (rx->sta)
2766                         rx->sta->rx_dropped++;
2767                 dev_kfree_skb(rx->skb);
2768                 break;
2769         case RX_QUEUED:
2770                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2771                 break;
2772         }
2773 }
2774
2775 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
2776 {
2777         ieee80211_rx_result res = RX_DROP_MONITOR;
2778         struct sk_buff *skb;
2779
2780 #define CALL_RXH(rxh)                   \
2781         do {                            \
2782                 res = rxh(rx);          \
2783                 if (res != RX_CONTINUE) \
2784                         goto rxh_next;  \
2785         } while (0);
2786
2787         spin_lock(&rx->local->rx_skb_queue.lock);
2788         if (rx->local->running_rx_handler)
2789                 goto unlock;
2790
2791         rx->local->running_rx_handler = true;
2792
2793         while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2794                 spin_unlock(&rx->local->rx_skb_queue.lock);
2795
2796                 /*
2797                  * all the other fields are valid across frames
2798                  * that belong to an aMPDU since they are on the
2799                  * same TID from the same station
2800                  */
2801                 rx->skb = skb;
2802
2803                 CALL_RXH(ieee80211_rx_h_decrypt)
2804                 CALL_RXH(ieee80211_rx_h_check_more_data)
2805                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2806                 CALL_RXH(ieee80211_rx_h_sta_process)
2807                 CALL_RXH(ieee80211_rx_h_defragment)
2808                 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2809                 /* must be after MMIC verify so header is counted in MPDU mic */
2810 #ifdef CONFIG_MAC80211_MESH
2811                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2812                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
2813 #endif
2814                 CALL_RXH(ieee80211_rx_h_amsdu)
2815                 CALL_RXH(ieee80211_rx_h_data)
2816                 CALL_RXH(ieee80211_rx_h_ctrl);
2817                 CALL_RXH(ieee80211_rx_h_mgmt_check)
2818                 CALL_RXH(ieee80211_rx_h_action)
2819                 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2820                 CALL_RXH(ieee80211_rx_h_action_return)
2821                 CALL_RXH(ieee80211_rx_h_mgmt)
2822
2823  rxh_next:
2824                 ieee80211_rx_handlers_result(rx, res);
2825                 spin_lock(&rx->local->rx_skb_queue.lock);
2826 #undef CALL_RXH
2827         }
2828
2829         rx->local->running_rx_handler = false;
2830
2831  unlock:
2832         spin_unlock(&rx->local->rx_skb_queue.lock);
2833 }
2834
2835 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2836 {
2837         ieee80211_rx_result res = RX_DROP_MONITOR;
2838
2839 #define CALL_RXH(rxh)                   \
2840         do {                            \
2841                 res = rxh(rx);          \
2842                 if (res != RX_CONTINUE) \
2843                         goto rxh_next;  \
2844         } while (0);
2845
2846         CALL_RXH(ieee80211_rx_h_check)
2847
2848         ieee80211_rx_reorder_ampdu(rx);
2849
2850         ieee80211_rx_handlers(rx);
2851         return;
2852
2853  rxh_next:
2854         ieee80211_rx_handlers_result(rx, res);
2855
2856 #undef CALL_RXH
2857 }
2858
2859 /*
2860  * This function makes calls into the RX path, therefore
2861  * it has to be invoked under RCU read lock.
2862  */
2863 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2864 {
2865         struct ieee80211_rx_data rx = {
2866                 .sta = sta,
2867                 .sdata = sta->sdata,
2868                 .local = sta->local,
2869                 /* This is OK -- must be QoS data frame */
2870                 .security_idx = tid,
2871                 .seqno_idx = tid,
2872                 .flags = 0,
2873         };
2874         struct tid_ampdu_rx *tid_agg_rx;
2875
2876         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2877         if (!tid_agg_rx)
2878                 return;
2879
2880         spin_lock(&tid_agg_rx->reorder_lock);
2881         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx);
2882         spin_unlock(&tid_agg_rx->reorder_lock);
2883
2884         ieee80211_rx_handlers(&rx);
2885 }
2886
2887 /* main receive path */
2888
2889 static int prepare_for_handlers(struct ieee80211_rx_data *rx,
2890                                 struct ieee80211_hdr *hdr)
2891 {
2892         struct ieee80211_sub_if_data *sdata = rx->sdata;
2893         struct sk_buff *skb = rx->skb;
2894         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2895         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2896         int multicast = is_multicast_ether_addr(hdr->addr1);
2897
2898         switch (sdata->vif.type) {
2899         case NL80211_IFTYPE_STATION:
2900                 if (!bssid && !sdata->u.mgd.use_4addr)
2901                         return 0;
2902                 if (!multicast &&
2903                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
2904                         if (!(sdata->dev->flags & IFF_PROMISC) ||
2905                             sdata->u.mgd.use_4addr)
2906                                 return 0;
2907                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2908                 }
2909                 break;
2910         case NL80211_IFTYPE_ADHOC:
2911                 if (!bssid)
2912                         return 0;
2913                 if (ieee80211_is_beacon(hdr->frame_control)) {
2914                         return 1;
2915                 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2916                         return 0;
2917                 } else if (!multicast &&
2918                            !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
2919                         if (!(sdata->dev->flags & IFF_PROMISC))
2920                                 return 0;
2921                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2922                 } else if (!rx->sta) {
2923                         int rate_idx;
2924                         if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
2925                                 rate_idx = 0; /* TODO: HT/VHT rates */
2926                         else
2927                                 rate_idx = status->rate_idx;
2928                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
2929                                                  BIT(rate_idx));
2930                 }
2931                 break;
2932         case NL80211_IFTYPE_MESH_POINT:
2933                 if (!multicast &&
2934                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
2935                         if (!(sdata->dev->flags & IFF_PROMISC))
2936                                 return 0;
2937
2938                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2939                 }
2940                 break;
2941         case NL80211_IFTYPE_AP_VLAN:
2942         case NL80211_IFTYPE_AP:
2943                 if (!bssid) {
2944                         if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
2945                                 return 0;
2946                 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
2947                         /*
2948                          * Accept public action frames even when the
2949                          * BSSID doesn't match, this is used for P2P
2950                          * and location updates. Note that mac80211
2951                          * itself never looks at these frames.
2952                          */
2953                         if (ieee80211_is_public_action(hdr, skb->len))
2954                                 return 1;
2955                         if (!ieee80211_is_beacon(hdr->frame_control))
2956                                 return 0;
2957                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2958                 }
2959                 break;
2960         case NL80211_IFTYPE_WDS:
2961                 if (bssid || !ieee80211_is_data(hdr->frame_control))
2962                         return 0;
2963                 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
2964                         return 0;
2965                 break;
2966         case NL80211_IFTYPE_P2P_DEVICE:
2967                 if (!ieee80211_is_public_action(hdr, skb->len) &&
2968                     !ieee80211_is_probe_req(hdr->frame_control) &&
2969                     !ieee80211_is_probe_resp(hdr->frame_control) &&
2970                     !ieee80211_is_beacon(hdr->frame_control))
2971                         return 0;
2972                 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
2973                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2974                 break;
2975         default:
2976                 /* should never get here */
2977                 WARN_ON_ONCE(1);
2978                 break;
2979         }
2980
2981         return 1;
2982 }
2983
2984 /*
2985  * This function returns whether or not the SKB
2986  * was destined for RX processing or not, which,
2987  * if consume is true, is equivalent to whether
2988  * or not the skb was consumed.
2989  */
2990 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2991                                             struct sk_buff *skb, bool consume)
2992 {
2993         struct ieee80211_local *local = rx->local;
2994         struct ieee80211_sub_if_data *sdata = rx->sdata;
2995         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2996         struct ieee80211_hdr *hdr = (void *)skb->data;
2997         int prepares;
2998
2999         rx->skb = skb;
3000         status->rx_flags |= IEEE80211_RX_RA_MATCH;
3001         prepares = prepare_for_handlers(rx, hdr);
3002
3003         if (!prepares)
3004                 return false;
3005
3006         if (!consume) {
3007                 skb = skb_copy(skb, GFP_ATOMIC);
3008                 if (!skb) {
3009                         if (net_ratelimit())
3010                                 wiphy_debug(local->hw.wiphy,
3011                                         "failed to copy skb for %s\n",
3012                                         sdata->name);
3013                         return true;
3014                 }
3015
3016                 rx->skb = skb;
3017         }
3018
3019         ieee80211_invoke_rx_handlers(rx);
3020         return true;
3021 }
3022
3023 /*
3024  * This is the actual Rx frames handler. as it blongs to Rx path it must
3025  * be called with rcu_read_lock protection.
3026  */
3027 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3028                                          struct sk_buff *skb)
3029 {
3030         struct ieee80211_local *local = hw_to_local(hw);
3031         struct ieee80211_sub_if_data *sdata;
3032         struct ieee80211_hdr *hdr;
3033         __le16 fc;
3034         struct ieee80211_rx_data rx;
3035         struct ieee80211_sub_if_data *prev;
3036         struct sta_info *sta, *tmp, *prev_sta;
3037         int err = 0;
3038
3039         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3040         memset(&rx, 0, sizeof(rx));
3041         rx.skb = skb;
3042         rx.local = local;
3043
3044         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3045                 local->dot11ReceivedFragmentCount++;
3046
3047         if (ieee80211_is_mgmt(fc)) {
3048                 /* drop frame if too short for header */
3049                 if (skb->len < ieee80211_hdrlen(fc))
3050                         err = -ENOBUFS;
3051                 else
3052                         err = skb_linearize(skb);
3053         } else {
3054                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3055         }
3056
3057         if (err) {
3058                 dev_kfree_skb(skb);
3059                 return;
3060         }
3061
3062         hdr = (struct ieee80211_hdr *)skb->data;
3063         ieee80211_parse_qos(&rx);
3064         ieee80211_verify_alignment(&rx);
3065
3066         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3067                      ieee80211_is_beacon(hdr->frame_control)))
3068                 ieee80211_scan_rx(local, skb);
3069
3070         if (ieee80211_is_data(fc)) {
3071                 prev_sta = NULL;
3072
3073                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
3074                         if (!prev_sta) {
3075                                 prev_sta = sta;
3076                                 continue;
3077                         }
3078
3079                         rx.sta = prev_sta;
3080                         rx.sdata = prev_sta->sdata;
3081                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
3082
3083                         prev_sta = sta;
3084                 }
3085
3086                 if (prev_sta) {
3087                         rx.sta = prev_sta;
3088                         rx.sdata = prev_sta->sdata;
3089
3090                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3091                                 return;
3092                         goto out;
3093                 }
3094         }
3095
3096         prev = NULL;
3097
3098         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3099                 if (!ieee80211_sdata_running(sdata))
3100                         continue;
3101
3102                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3103                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3104                         continue;
3105
3106                 /*
3107                  * frame is destined for this interface, but if it's
3108                  * not also for the previous one we handle that after
3109                  * the loop to avoid copying the SKB once too much
3110                  */
3111
3112                 if (!prev) {
3113                         prev = sdata;
3114                         continue;
3115                 }
3116
3117                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3118                 rx.sdata = prev;
3119                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3120
3121                 prev = sdata;
3122         }
3123
3124         if (prev) {
3125                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3126                 rx.sdata = prev;
3127
3128                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3129                         return;
3130         }
3131
3132  out:
3133         dev_kfree_skb(skb);
3134 }
3135
3136 /*
3137  * This is the receive path handler. It is called by a low level driver when an
3138  * 802.11 MPDU is received from the hardware.
3139  */
3140 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3141 {
3142         struct ieee80211_local *local = hw_to_local(hw);
3143         struct ieee80211_rate *rate = NULL;
3144         struct ieee80211_supported_band *sband;
3145         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3146
3147         WARN_ON_ONCE(softirq_count() == 0);
3148
3149         if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3150                 goto drop;
3151
3152         sband = local->hw.wiphy->bands[status->band];
3153         if (WARN_ON(!sband))
3154                 goto drop;
3155
3156         /*
3157          * If we're suspending, it is possible although not too likely
3158          * that we'd be receiving frames after having already partially
3159          * quiesced the stack. We can't process such frames then since
3160          * that might, for example, cause stations to be added or other
3161          * driver callbacks be invoked.
3162          */
3163         if (unlikely(local->quiescing || local->suspended))
3164                 goto drop;
3165
3166         /* We might be during a HW reconfig, prevent Rx for the same reason */
3167         if (unlikely(local->in_reconfig))
3168                 goto drop;
3169
3170         /*
3171          * The same happens when we're not even started,
3172          * but that's worth a warning.
3173          */
3174         if (WARN_ON(!local->started))
3175                 goto drop;
3176
3177         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3178                 /*
3179                  * Validate the rate, unless a PLCP error means that
3180                  * we probably can't have a valid rate here anyway.
3181                  */
3182
3183                 if (status->flag & RX_FLAG_HT) {
3184                         /*
3185                          * rate_idx is MCS index, which can be [0-76]
3186                          * as documented on:
3187                          *
3188                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3189                          *
3190                          * Anything else would be some sort of driver or
3191                          * hardware error. The driver should catch hardware
3192                          * errors.
3193                          */
3194                         if (WARN(status->rate_idx > 76,
3195                                  "Rate marked as an HT rate but passed "
3196                                  "status->rate_idx is not "
3197                                  "an MCS index [0-76]: %d (0x%02x)\n",
3198                                  status->rate_idx,
3199                                  status->rate_idx))
3200                                 goto drop;
3201                 } else if (status->flag & RX_FLAG_VHT) {
3202                         if (WARN_ONCE(status->rate_idx > 9 ||
3203                                       !status->vht_nss ||
3204                                       status->vht_nss > 8,
3205                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3206                                       status->rate_idx, status->vht_nss))
3207                                 goto drop;
3208                 } else {
3209                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3210                                 goto drop;
3211                         rate = &sband->bitrates[status->rate_idx];
3212                 }
3213         }
3214
3215         status->rx_flags = 0;
3216
3217         /*
3218          * key references and virtual interfaces are protected using RCU
3219          * and this requires that we are in a read-side RCU section during
3220          * receive processing
3221          */
3222         rcu_read_lock();
3223
3224         /*
3225          * Frames with failed FCS/PLCP checksum are not returned,
3226          * all other frames are returned without radiotap header
3227          * if it was previously present.
3228          * Also, frames with less than 16 bytes are dropped.
3229          */
3230         skb = ieee80211_rx_monitor(local, skb, rate);
3231         if (!skb) {
3232                 rcu_read_unlock();
3233                 return;
3234         }
3235
3236         ieee80211_tpt_led_trig_rx(local,
3237                         ((struct ieee80211_hdr *)skb->data)->frame_control,
3238                         skb->len);
3239         __ieee80211_rx_handle_packet(hw, skb);
3240
3241         rcu_read_unlock();
3242
3243         return;
3244  drop:
3245         kfree_skb(skb);
3246 }
3247 EXPORT_SYMBOL(ieee80211_rx);
3248
3249 /* This is a version of the rx handler that can be called from hard irq
3250  * context. Post the skb on the queue and schedule the tasklet */
3251 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3252 {
3253         struct ieee80211_local *local = hw_to_local(hw);
3254
3255         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3256
3257         skb->pkt_type = IEEE80211_RX_MSG;
3258         skb_queue_tail(&local->skb_queue, skb);
3259         tasklet_schedule(&local->tasklet);
3260 }
3261 EXPORT_SYMBOL(ieee80211_rx_irqsafe);