net/mac80211/rx.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2007-2010  Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/jiffies.h>
  14 #include <linux/slab.h>
  15 #include <linux/kernel.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rcupdate.h>
  20 #include <linux/export.h>
  21 #include <net/mac80211.h>
  22 #include <net/ieee80211_radiotap.h>
  23 #include <asm/unaligned.h>
  24
  25 #include "ieee80211_i.h"
  26 #include "driver-ops.h"
  27 #include "led.h"
  28 #include "mesh.h"
  29 #include "wep.h"
  30 #include "wpa.h"
  31 #include "tkip.h"
  32 #include "wme.h"
  33 #include "rate.h"
  34
  35 /*
  36  * monitor mode reception
  37  *
  38  * This function cleans up the SKB, i.e. it removes all the stuff
  39  * only useful for monitoring.
  40  */
  41 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
  42                                            struct sk_buff *skb)
  43 {
  44         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
  45                 if (likely(skb->len > FCS_LEN))
  46                         __pskb_trim(skb, skb->len - FCS_LEN);
  47                 else {
  48                         /* driver bug */
  49                         WARN_ON(1);
  50                         dev_kfree_skb(skb);
  51                         return NULL;
  52                 }
  53         }
  54
  55         return skb;
  56 }
  57
  58 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len)
  59 {
  60         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
  61         struct ieee80211_hdr *hdr = (void *)skb->data;
  62
  63         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
  64                             RX_FLAG_FAILED_PLCP_CRC |
  65                             RX_FLAG_AMPDU_IS_ZEROLEN))
  66                 return true;
  67
  68         if (unlikely(skb->len < 16 + present_fcs_len))
  69                 return true;
  70
  71         if (ieee80211_is_ctl(hdr->frame_control) &&
  72             !ieee80211_is_pspoll(hdr->frame_control) &&
  73             !ieee80211_is_back_req(hdr->frame_control))
  74                 return true;
  75
  76         return false;
  77 }
  78
  79 static int
  80 ieee80211_rx_radiotap_space(struct ieee80211_local *local,
  81                             struct ieee80211_rx_status *status)
  82 {
  83         int len;
  84
  85         /* always present fields */
  86         len = sizeof(struct ieee80211_radiotap_header) + 8;
  87
  88         /* allocate extra bitmaps */
  89         if (status->chains)
  90                 len += 4 * hweight8(status->chains);
  91
  92         if (ieee80211_have_rx_timestamp(status)) {
  93                 len = ALIGN(len, 8);
  94                 len += 8;
  95         }
  96         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
  97                 len += 1;
  98
  99         /* antenna field, if we don't have per-chain info */
 100         if (!status->chains)
 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->chains) {
 120                 /* antenna and antenna signal fields */
 121                 len += 2 * hweight8(status->chains);
 122         }
 123
 124         return len;
 125 }
 126
 127 /*
 128  * ieee80211_add_rx_radiotap_header - add radiotap header
 129  *
 130  * add a radiotap header containing all the fields which the hardware provided.
 131  */
 132 static void
 133 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 134                                  struct sk_buff *skb,
 135                                  struct ieee80211_rate *rate,
 136                                  int rtap_len, bool has_fcs)
 137 {
 138         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 139         struct ieee80211_radiotap_header *rthdr;
 140         unsigned char *pos;
 141         __le32 *it_present;
 142         u32 it_present_val;
 143         u16 rx_flags = 0;
 144         u16 channel_flags = 0;
 145         int mpdulen, chain;
 146         unsigned long chains = status->chains;
 147
 148         mpdulen = skb->len;
 149         if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
 150                 mpdulen += FCS_LEN;
 151
 152         rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
 153         memset(rthdr, 0, rtap_len);
 154         it_present = &rthdr->it_present;
 155
 156         /* radiotap header, set always present flags */
 157         rthdr->it_len = cpu_to_le16(rtap_len);
 158         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
 159                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
 160                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
 161
 162         if (!status->chains)
 163                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
 164
 165         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 166                 it_present_val |=
 167                         BIT(IEEE80211_RADIOTAP_EXT) |
 168                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
 169                 put_unaligned_le32(it_present_val, it_present);
 170                 it_present++;
 171                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
 172                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 173         }
 174
 175         put_unaligned_le32(it_present_val, it_present);
 176
 177         pos = (void *)(it_present + 1);
 178
 179         /* the order of the following fields is important */
 180
 181         /* IEEE80211_RADIOTAP_TSFT */
 182         if (ieee80211_have_rx_timestamp(status)) {
 183                 /* padding */
 184                 while ((pos - (u8 *)rthdr) & 7)
 185                         *pos++ = 0;
 186                 put_unaligned_le64(
 187                         ieee80211_calculate_rx_timestamp(local, status,
 188                                                          mpdulen, 0),
 189                         pos);
 190                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 191                 pos += 8;
 192         }
 193
 194         /* IEEE80211_RADIOTAP_FLAGS */
 195         if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
 196                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 197         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 198                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 199         if (status->flag & RX_FLAG_SHORTPRE)
 200                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 201         pos++;
 202
 203         /* IEEE80211_RADIOTAP_RATE */
 204         if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
 205                 /*
 206                  * Without rate information don't add it. If we have,
 207                  * MCS information is a separate field in radiotap,
 208                  * added below. The byte here is needed as padding
 209                  * for the channel though, so initialise it to 0.
 210                  */
 211                 *pos = 0;
 212         } else {
 213                 int shift = 0;
 214                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 215                 if (status->flag & RX_FLAG_10MHZ)
 216                         shift = 1;
 217                 else if (status->flag & RX_FLAG_5MHZ)
 218                         shift = 2;
 219                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
 220         }
 221         pos++;
 222
 223         /* IEEE80211_RADIOTAP_CHANNEL */
 224         put_unaligned_le16(status->freq, pos);
 225         pos += 2;
 226         if (status->flag & RX_FLAG_10MHZ)
 227                 channel_flags |= IEEE80211_CHAN_HALF;
 228         else if (status->flag & RX_FLAG_5MHZ)
 229                 channel_flags |= IEEE80211_CHAN_QUARTER;
 230
 231         if (status->band == IEEE80211_BAND_5GHZ)
 232                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 233         else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
 234                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 235         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 236                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 237         else if (rate)
 238                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 239         else
 240                 channel_flags |= IEEE80211_CHAN_2GHZ;
 241         put_unaligned_le16(channel_flags, pos);
 242         pos += 2;
 243
 244         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 245         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
 246             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 247                 *pos = status->signal;
 248                 rthdr->it_present |=
 249                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 250                 pos++;
 251         }
 252
 253         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 254
 255         if (!status->chains) {
 256                 /* IEEE80211_RADIOTAP_ANTENNA */
 257                 *pos = status->antenna;
 258                 pos++;
 259         }
 260
 261         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 262
 263         /* IEEE80211_RADIOTAP_RX_FLAGS */
 264         /* ensure 2 byte alignment for the 2 byte field as required */
 265         if ((pos - (u8 *)rthdr) & 1)
 266                 *pos++ = 0;
 267         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 268                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 269         put_unaligned_le16(rx_flags, pos);
 270         pos += 2;
 271
 272         if (status->flag & RX_FLAG_HT) {
 273                 unsigned int stbc;
 274
 275                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 276                 *pos++ = local->hw.radiotap_mcs_details;
 277                 *pos = 0;
 278                 if (status->flag & RX_FLAG_SHORT_GI)
 279                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 280                 if (status->flag & RX_FLAG_40MHZ)
 281                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 282                 if (status->flag & RX_FLAG_HT_GF)
 283                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 284                 if (status->flag & RX_FLAG_LDPC)
 285                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
 286                 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
 287                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 288                 pos++;
 289                 *pos++ = status->rate_idx;
 290         }
 291
 292         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 293                 u16 flags = 0;
 294
 295                 /* ensure 4 byte alignment */
 296                 while ((pos - (u8 *)rthdr) & 3)
 297                         pos++;
 298                 rthdr->it_present |=
 299                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 300                 put_unaligned_le32(status->ampdu_reference, pos);
 301                 pos += 4;
 302                 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
 303                         flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
 304                 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
 305                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
 306                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 307                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 308                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 309                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 310                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 311                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 312                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 313                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 314                 put_unaligned_le16(flags, pos);
 315                 pos += 2;
 316                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 317                         *pos++ = status->ampdu_delimiter_crc;
 318                 else
 319                         *pos++ = 0;
 320                 *pos++ = 0;
 321         }
 322
 323         if (status->flag & RX_FLAG_VHT) {
 324                 u16 known = local->hw.radiotap_vht_details;
 325
 326                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 327                 /* known field - how to handle 80+80? */
 328                 if (status->vht_flag & RX_VHT_FLAG_80P80MHZ)
 329                         known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 330                 put_unaligned_le16(known, pos);
 331                 pos += 2;
 332                 /* flags */
 333                 if (status->flag & RX_FLAG_SHORT_GI)
 334                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 335                 /* in VHT, STBC is binary */
 336                 if (status->flag & RX_FLAG_STBC_MASK)
 337                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
 338                 if (status->vht_flag & RX_VHT_FLAG_BF)
 339                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
 340                 pos++;
 341                 /* bandwidth */
 342                 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
 343                         *pos++ = 4;
 344                 else if (status->vht_flag & RX_VHT_FLAG_80P80MHZ)
 345                         *pos++ = 0; /* marked not known above */
 346                 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
 347                         *pos++ = 11;
 348                 else if (status->flag & RX_FLAG_40MHZ)
 349                         *pos++ = 1;
 350                 else /* 20 MHz */
 351                         *pos++ = 0;
 352                 /* MCS/NSS */
 353                 *pos = (status->rate_idx << 4) | status->vht_nss;
 354                 pos += 4;
 355                 /* coding field */
 356                 if (status->flag & RX_FLAG_LDPC)
 357                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
 358                 pos++;
 359                 /* group ID */
 360                 pos++;
 361                 /* partial_aid */
 362                 pos += 2;
 363         }
 364
 365         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 366                 *pos++ = status->chain_signal[chain];
 367                 *pos++ = chain;
 368         }
 369 }
 370
 371 /*
 372  * This function copies a received frame to all monitor interfaces and
 373  * returns a cleaned-up SKB that no longer includes the FCS nor the
 374  * radiotap header the driver might have added.
 375  */
 376 static struct sk_buff *
 377 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 378                      struct ieee80211_rate *rate)
 379 {
 380         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 381         struct ieee80211_sub_if_data *sdata;
 382         int needed_headroom;
 383         struct sk_buff *skb, *skb2;
 384         struct net_device *prev_dev = NULL;
 385         int present_fcs_len = 0;
 386
 387         /*
 388          * First, we may need to make a copy of the skb because
 389          *  (1) we need to modify it for radiotap (if not present), and
 390          *  (2) the other RX handlers will modify the skb we got.
 391          *
 392          * We don't need to, of course, if we aren't going to return
 393          * the SKB because it has a bad FCS/PLCP checksum.
 394          */
 395
 396         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
 397                 present_fcs_len = FCS_LEN;
 398
 399         /* ensure hdr->frame_control is in skb head */
 400         if (!pskb_may_pull(origskb, 2)) {
 401                 dev_kfree_skb(origskb);
 402                 return NULL;
 403         }
 404
 405         if (!local->monitors) {
 406                 if (should_drop_frame(origskb, present_fcs_len)) {
 407                         dev_kfree_skb(origskb);
 408                         return NULL;
 409                 }
 410
 411                 return remove_monitor_info(local, origskb);
 412         }
 413
 414         /* room for the radiotap header based on driver features */
 415         needed_headroom = ieee80211_rx_radiotap_space(local, status);
 416
 417         if (should_drop_frame(origskb, present_fcs_len)) {
 418                 /* only need to expand headroom if necessary */
 419                 skb = origskb;
 420                 origskb = NULL;
 421
 422                 /*
 423                  * This shouldn't trigger often because most devices have an
 424                  * RX header they pull before we get here, and that should
 425                  * be big enough for our radiotap information. We should
 426                  * probably export the length to drivers so that we can have
 427                  * them allocate enough headroom to start with.
 428                  */
 429                 if (skb_headroom(skb) < needed_headroom &&
 430                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 431                         dev_kfree_skb(skb);
 432                         return NULL;
 433                 }
 434         } else {
 435                 /*
 436                  * Need to make a copy and possibly remove radiotap header
 437                  * and FCS from the original.
 438                  */
 439                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
 440
 441                 origskb = remove_monitor_info(local, origskb);
 442
 443                 if (!skb)
 444                         return origskb;
 445         }
 446
 447         /* prepend radiotap information */
 448         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
 449                                          true);
 450
 451         skb_reset_mac_header(skb);
 452         skb->ip_summed = CHECKSUM_UNNECESSARY;
 453         skb->pkt_type = PACKET_OTHERHOST;
 454         skb->protocol = htons(ETH_P_802_2);
 455
 456         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 457                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
 458                         continue;
 459
 460                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
 461                         continue;
 462
 463                 if (!ieee80211_sdata_running(sdata))
 464                         continue;
 465
 466                 if (prev_dev) {
 467                         skb2 = skb_clone(skb, GFP_ATOMIC);
 468                         if (skb2) {
 469                                 skb2->dev = prev_dev;
 470                                 netif_receive_skb(skb2);
 471                         }
 472                 }
 473
 474                 prev_dev = sdata->dev;
 475                 sdata->dev->stats.rx_packets++;
 476                 sdata->dev->stats.rx_bytes += skb->len;
 477         }
 478
 479         if (prev_dev) {
 480                 skb->dev = prev_dev;
 481                 netif_receive_skb(skb);
 482         } else
 483                 dev_kfree_skb(skb);
 484
 485         return origskb;
 486 }
 487
 488 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 489 {
 490         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 491         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 492         int tid, seqno_idx, security_idx;
 493
 494         /* does the frame have a qos control field? */
 495         if (ieee80211_is_data_qos(hdr->frame_control)) {
 496                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 497                 /* frame has qos control */
 498                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 499                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 500                         status->rx_flags |= IEEE80211_RX_AMSDU;
 501
 502                 seqno_idx = tid;
 503                 security_idx = tid;
 504         } else {
 505                 /*
 506                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 507                  *
 508                  *      Sequence numbers for management frames, QoS data
 509                  *      frames with a broadcast/multicast address in the
 510                  *      Address 1 field, and all non-QoS data frames sent
 511                  *      by QoS STAs are assigned using an additional single
 512                  *      modulo-4096 counter, [...]
 513                  *
 514                  * We also use that counter for non-QoS STAs.
 515                  */
 516                 seqno_idx = IEEE80211_NUM_TIDS;
 517                 security_idx = 0;
 518                 if (ieee80211_is_mgmt(hdr->frame_control))
 519                         security_idx = IEEE80211_NUM_TIDS;
 520                 tid = 0;
 521         }
 522
 523         rx->seqno_idx = seqno_idx;
 524         rx->security_idx = security_idx;
 525         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 526          * For now, set skb->priority to 0 for other cases. */
 527         rx->skb->priority = (tid > 7) ? 0 : tid;
 528 }
 529
 530 /**
 531  * DOC: Packet alignment
 532  *
 533  * Drivers always need to pass packets that are aligned to two-byte boundaries
 534  * to the stack.
 535  *
 536  * Additionally, should, if possible, align the payload data in a way that
 537  * guarantees that the contained IP header is aligned to a four-byte
 538  * boundary. In the case of regular frames, this simply means aligning the
 539  * payload to a four-byte boundary (because either the IP header is directly
 540  * contained, or IV/RFC1042 headers that have a length divisible by four are
 541  * in front of it).  If the payload data is not properly aligned and the
 542  * architecture doesn't support efficient unaligned operations, mac80211
 543  * will align the data.
 544  *
 545  * With A-MSDU frames, however, the payload data address must yield two modulo
 546  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 547  * push the IP header further back to a multiple of four again. Thankfully, the
 548  * specs were sane enough this time around to require padding each A-MSDU
 549  * subframe to a length that is a multiple of four.
 550  *
 551  * Padding like Atheros hardware adds which is between the 802.11 header and
 552  * the payload is not supported, the driver is required to move the 802.11
 553  * header to be directly in front of the payload in that case.
 554  */
 555 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 556 {
 557 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 558         WARN_ONCE((unsigned long)rx->skb->data & 1,
 559                   "unaligned packet at 0x%p\n", rx->skb->data);
 560 #endif
 561 }
 562
 563
 564 /* rx handlers */
 565
 566 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 567 {
 568         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 569
 570         if (is_multicast_ether_addr(hdr->addr1))
 571                 return 0;
 572
 573         return ieee80211_is_robust_mgmt_frame(skb);
 574 }
 575
 576
 577 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 578 {
 579         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 580
 581         if (!is_multicast_ether_addr(hdr->addr1))
 582                 return 0;
 583
 584         return ieee80211_is_robust_mgmt_frame(skb);
 585 }
 586
 587
 588 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 589 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 590 {
 591         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 592         struct ieee80211_mmie *mmie;
 593
 594         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 595                 return -1;
 596
 597         if (!ieee80211_is_robust_mgmt_frame(skb))
 598                 return -1; /* not a robust management frame */
 599
 600         mmie = (struct ieee80211_mmie *)
 601                 (skb->data + skb->len - sizeof(*mmie));
 602         if (mmie->element_id != WLAN_EID_MMIE ||
 603             mmie->length != sizeof(*mmie) - 2)
 604                 return -1;
 605
 606         return le16_to_cpu(mmie->key_id);
 607 }
 608
 609 static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
 610                                  struct sk_buff *skb)
 611 {
 612         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 613         __le16 fc;
 614         int hdrlen;
 615         u8 keyid;
 616
 617         fc = hdr->frame_control;
 618         hdrlen = ieee80211_hdrlen(fc);
 619
 620         if (skb->len < hdrlen + cs->hdr_len)
 621                 return -EINVAL;
 622
 623         skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
 624         keyid &= cs->key_idx_mask;
 625         keyid >>= cs->key_idx_shift;
 626
 627         return keyid;
 628 }
 629
 630 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
 631 {
 632         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 633         char *dev_addr = rx->sdata->vif.addr;
 634
 635         if (ieee80211_is_data(hdr->frame_control)) {
 636                 if (is_multicast_ether_addr(hdr->addr1)) {
 637                         if (ieee80211_has_tods(hdr->frame_control) ||
 638                             !ieee80211_has_fromds(hdr->frame_control))
 639                                 return RX_DROP_MONITOR;
 640                         if (ether_addr_equal(hdr->addr3, dev_addr))
 641                                 return RX_DROP_MONITOR;
 642                 } else {
 643                         if (!ieee80211_has_a4(hdr->frame_control))
 644                                 return RX_DROP_MONITOR;
 645                         if (ether_addr_equal(hdr->addr4, dev_addr))
 646                                 return RX_DROP_MONITOR;
 647                 }
 648         }
 649
 650         /* If there is not an established peer link and this is not a peer link
 651          * establisment frame, beacon or probe, drop the frame.
 652          */
 653
 654         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
 655                 struct ieee80211_mgmt *mgmt;
 656
 657                 if (!ieee80211_is_mgmt(hdr->frame_control))
 658                         return RX_DROP_MONITOR;
 659
 660                 if (ieee80211_is_action(hdr->frame_control)) {
 661                         u8 category;
 662
 663                         /* make sure category field is present */
 664                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
 665                                 return RX_DROP_MONITOR;
 666
 667                         mgmt = (struct ieee80211_mgmt *)hdr;
 668                         category = mgmt->u.action.category;
 669                         if (category != WLAN_CATEGORY_MESH_ACTION &&
 670                             category != WLAN_CATEGORY_SELF_PROTECTED)
 671                                 return RX_DROP_MONITOR;
 672                         return RX_CONTINUE;
 673                 }
 674
 675                 if (ieee80211_is_probe_req(hdr->frame_control) ||
 676                     ieee80211_is_probe_resp(hdr->frame_control) ||
 677                     ieee80211_is_beacon(hdr->frame_control) ||
 678                     ieee80211_is_auth(hdr->frame_control))
 679                         return RX_CONTINUE;
 680
 681                 return RX_DROP_MONITOR;
 682         }
 683
 684         return RX_CONTINUE;
 685 }
 686
 687 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
 688                                             struct tid_ampdu_rx *tid_agg_rx,
 689                                             int index,
 690                                             struct sk_buff_head *frames)
 691 {
 692         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
 693         struct sk_buff *skb;
 694         struct ieee80211_rx_status *status;
 695
 696         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 697
 698         if (skb_queue_empty(skb_list))
 699                 goto no_frame;
 700
 701         if (!ieee80211_rx_reorder_ready(skb_list)) {
 702                 __skb_queue_purge(skb_list);
 703                 goto no_frame;
 704         }
 705
 706         /* release frames from the reorder ring buffer */
 707         tid_agg_rx->stored_mpdu_num--;
 708         while ((skb = __skb_dequeue(skb_list))) {
 709                 status = IEEE80211_SKB_RXCB(skb);
 710                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
 711                 __skb_queue_tail(frames, skb);
 712         }
 713
 714 no_frame:
 715         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 716 }
 717
 718 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
 719                                              struct tid_ampdu_rx *tid_agg_rx,
 720                                              u16 head_seq_num,
 721                                              struct sk_buff_head *frames)
 722 {
 723         int index;
 724
 725         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 726
 727         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
 728                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 729                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 730                                                 frames);
 731         }
 732 }
 733
 734 /*
 735  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
 736  * the skb was added to the buffer longer than this time ago, the earlier
 737  * frames that have not yet been received are assumed to be lost and the skb
 738  * can be released for processing. This may also release other skb's from the
 739  * reorder buffer if there are no additional gaps between the frames.
 740  *
 741  * Callers must hold tid_agg_rx->reorder_lock.
 742  */
 743 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
 744
 745 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
 746                                           struct tid_ampdu_rx *tid_agg_rx,
 747                                           struct sk_buff_head *frames)
 748 {
 749         int index, i, j;
 750
 751         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 752
 753         /* release the buffer until next missing frame */
 754         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 755         if (!ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index]) &&
 756             tid_agg_rx->stored_mpdu_num) {
 757                 /*
 758                  * No buffers ready to be released, but check whether any
 759                  * frames in the reorder buffer have timed out.
 760                  */
 761                 int skipped = 1;
 762                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
 763                      j = (j + 1) % tid_agg_rx->buf_size) {
 764                         if (!ieee80211_rx_reorder_ready(
 765                                         &tid_agg_rx->reorder_buf[j])) {
 766                                 skipped++;
 767                                 continue;
 768                         }
 769                         if (skipped &&
 770                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
 771                                         HT_RX_REORDER_BUF_TIMEOUT))
 772                                 goto set_release_timer;
 773
 774                         /* don't leave incomplete A-MSDUs around */
 775                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
 776                              i = (i + 1) % tid_agg_rx->buf_size)
 777                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
 778
 779                         ht_dbg_ratelimited(sdata,
 780                                            "release an RX reorder frame due to timeout on earlier frames\n");
 781                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
 782                                                         frames);
 783
 784                         /*
 785                          * Increment the head seq# also for the skipped slots.
 786                          */
 787                         tid_agg_rx->head_seq_num =
 788                                 (tid_agg_rx->head_seq_num +
 789                                  skipped) & IEEE80211_SN_MASK;
 790                         skipped = 0;
 791                 }
 792         } else while (ieee80211_rx_reorder_ready(
 793                                 &tid_agg_rx->reorder_buf[index])) {
 794                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 795                                                 frames);
 796                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 797         }
 798
 799         if (tid_agg_rx->stored_mpdu_num) {
 800                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 801
 802                 for (; j != (index - 1) % tid_agg_rx->buf_size;
 803                      j = (j + 1) % tid_agg_rx->buf_size) {
 804                         if (ieee80211_rx_reorder_ready(
 805                                         &tid_agg_rx->reorder_buf[j]))
 806                                 break;
 807                 }
 808
 809  set_release_timer:
 810
 811                 mod_timer(&tid_agg_rx->reorder_timer,
 812                           tid_agg_rx->reorder_time[j] + 1 +
 813                           HT_RX_REORDER_BUF_TIMEOUT);
 814         } else {
 815                 del_timer(&tid_agg_rx->reorder_timer);
 816         }
 817 }
 818
 819 /*
 820  * As this function belongs to the RX path it must be under
 821  * rcu_read_lock protection. It returns false if the frame
 822  * can be processed immediately, true if it was consumed.
 823  */
 824 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
 825                                              struct tid_ampdu_rx *tid_agg_rx,
 826                                              struct sk_buff *skb,
 827                                              struct sk_buff_head *frames)
 828 {
 829         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 830         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 831         u16 sc = le16_to_cpu(hdr->seq_ctrl);
 832         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
 833         u16 head_seq_num, buf_size;
 834         int index;
 835         bool ret = true;
 836
 837         spin_lock(&tid_agg_rx->reorder_lock);
 838
 839         /*
 840          * Offloaded BA sessions have no known starting sequence number so pick
 841          * one from first Rxed frame for this tid after BA was started.
 842          */
 843         if (unlikely(tid_agg_rx->auto_seq)) {
 844                 tid_agg_rx->auto_seq = false;
 845                 tid_agg_rx->ssn = mpdu_seq_num;
 846                 tid_agg_rx->head_seq_num = mpdu_seq_num;
 847         }
 848
 849         buf_size = tid_agg_rx->buf_size;
 850         head_seq_num = tid_agg_rx->head_seq_num;
 851
 852         /* frame with out of date sequence number */
 853         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
 854                 dev_kfree_skb(skb);
 855                 goto out;
 856         }
 857
 858         /*
 859          * If frame the sequence number exceeds our buffering window
 860          * size release some previous frames to make room for this one.
 861          */
 862         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
 863                 head_seq_num = ieee80211_sn_inc(
 864                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
 865                 /* release stored frames up to new head to stack */
 866                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
 867                                                  head_seq_num, frames);
 868         }
 869
 870         /* Now the new frame is always in the range of the reordering buffer */
 871
 872         index = mpdu_seq_num % tid_agg_rx->buf_size;
 873
 874         /* check if we already stored this frame */
 875         if (ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index])) {
 876                 dev_kfree_skb(skb);
 877                 goto out;
 878         }
 879
 880         /*
 881          * If the current MPDU is in the right order and nothing else
 882          * is stored we can process it directly, no need to buffer it.
 883          * If it is first but there's something stored, we may be able
 884          * to release frames after this one.
 885          */
 886         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
 887             tid_agg_rx->stored_mpdu_num == 0) {
 888                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
 889                         tid_agg_rx->head_seq_num =
 890                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 891                 ret = false;
 892                 goto out;
 893         }
 894
 895         /* put the frame in the reordering buffer */
 896         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
 897         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
 898                 tid_agg_rx->reorder_time[index] = jiffies;
 899                 tid_agg_rx->stored_mpdu_num++;
 900                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
 901         }
 902
 903  out:
 904         spin_unlock(&tid_agg_rx->reorder_lock);
 905         return ret;
 906 }
 907
 908 /*
 909  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
 910  * true if the MPDU was buffered, false if it should be processed.
 911  */
 912 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
 913                                        struct sk_buff_head *frames)
 914 {
 915         struct sk_buff *skb = rx->skb;
 916         struct ieee80211_local *local = rx->local;
 917         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 918         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 919         struct sta_info *sta = rx->sta;
 920         struct tid_ampdu_rx *tid_agg_rx;
 921         u16 sc;
 922         u8 tid, ack_policy;
 923
 924         if (!ieee80211_is_data_qos(hdr->frame_control) ||
 925             is_multicast_ether_addr(hdr->addr1))
 926                 goto dont_reorder;
 927
 928         /*
 929          * filter the QoS data rx stream according to
 930          * STA/TID and check if this STA/TID is on aggregation
 931          */
 932
 933         if (!sta)
 934                 goto dont_reorder;
 935
 936         ack_policy = *ieee80211_get_qos_ctl(hdr) &
 937                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
 938         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
 939
 940         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
 941         if (!tid_agg_rx)
 942                 goto dont_reorder;
 943
 944         /* qos null data frames are excluded */
 945         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
 946                 goto dont_reorder;
 947
 948         /* not part of a BA session */
 949         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
 950             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
 951                 goto dont_reorder;
 952
 953         /* not actually part of this BA session */
 954         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
 955                 goto dont_reorder;
 956
 957         /* new, potentially un-ordered, ampdu frame - process it */
 958
 959         /* reset session timer */
 960         if (tid_agg_rx->timeout)
 961                 tid_agg_rx->last_rx = jiffies;
 962
 963         /* if this mpdu is fragmented - terminate rx aggregation session */
 964         sc = le16_to_cpu(hdr->seq_ctrl);
 965         if (sc & IEEE80211_SCTL_FRAG) {
 966                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
 967                 skb_queue_tail(&rx->sdata->skb_queue, skb);
 968                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
 969                 return;
 970         }
 971
 972         /*
 973          * No locking needed -- we will only ever process one
 974          * RX packet at a time, and thus own tid_agg_rx. All
 975          * other code manipulating it needs to (and does) make
 976          * sure that we cannot get to it any more before doing
 977          * anything with it.
 978          */
 979         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
 980                                              frames))
 981                 return;
 982
 983  dont_reorder:
 984         __skb_queue_tail(frames, skb);
 985 }
 986
 987 static ieee80211_rx_result debug_noinline
 988 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
 989 {
 990         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 991         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 992
 993         /*
 994          * Drop duplicate 802.11 retransmissions
 995          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
 996          */
 997         if (rx->skb->len >= 24 && rx->sta &&
 998             !ieee80211_is_ctl(hdr->frame_control) &&
 999             !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1000             !is_multicast_ether_addr(hdr->addr1)) {
1001                 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1002                              rx->sta->last_seq_ctrl[rx->seqno_idx] ==
1003                              hdr->seq_ctrl)) {
1004                         if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
1005                                 rx->local->dot11FrameDuplicateCount++;
1006                                 rx->sta->num_duplicates++;
1007                         }
1008                         return RX_DROP_UNUSABLE;
1009                 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1010                         rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1011                 }
1012         }
1013
1014         if (unlikely(rx->skb->len < 16)) {
1015                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
1016                 return RX_DROP_MONITOR;
1017         }
1018
1019         /* Drop disallowed frame classes based on STA auth/assoc state;
1020          * IEEE 802.11, Chap 5.5.
1021          *
1022          * mac80211 filters only based on association state, i.e. it drops
1023          * Class 3 frames from not associated stations. hostapd sends
1024          * deauth/disassoc frames when needed. In addition, hostapd is
1025          * responsible for filtering on both auth and assoc states.
1026          */
1027
1028         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1029                 return ieee80211_rx_mesh_check(rx);
1030
1031         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1032                       ieee80211_is_pspoll(hdr->frame_control)) &&
1033                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1034                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1035                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1036                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1037                 /*
1038                  * accept port control frames from the AP even when it's not
1039                  * yet marked ASSOC to prevent a race where we don't set the
1040                  * assoc bit quickly enough before it sends the first frame
1041                  */
1042                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1043                     ieee80211_is_data_present(hdr->frame_control)) {
1044                         unsigned int hdrlen;
1045                         __be16 ethertype;
1046
1047                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1048
1049                         if (rx->skb->len < hdrlen + 8)
1050                                 return RX_DROP_MONITOR;
1051
1052                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1053                         if (ethertype == rx->sdata->control_port_protocol)
1054                                 return RX_CONTINUE;
1055                 }
1056
1057                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1058                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1059                                                hdr->addr2,
1060                                                GFP_ATOMIC))
1061                         return RX_DROP_UNUSABLE;
1062
1063                 return RX_DROP_MONITOR;
1064         }
1065
1066         return RX_CONTINUE;
1067 }
1068
1069
1070 static ieee80211_rx_result debug_noinline
1071 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1072 {
1073         struct ieee80211_local *local;
1074         struct ieee80211_hdr *hdr;
1075         struct sk_buff *skb;
1076
1077         local = rx->local;
1078         skb = rx->skb;
1079         hdr = (struct ieee80211_hdr *) skb->data;
1080
1081         if (!local->pspolling)
1082                 return RX_CONTINUE;
1083
1084         if (!ieee80211_has_fromds(hdr->frame_control))
1085                 /* this is not from AP */
1086                 return RX_CONTINUE;
1087
1088         if (!ieee80211_is_data(hdr->frame_control))
1089                 return RX_CONTINUE;
1090
1091         if (!ieee80211_has_moredata(hdr->frame_control)) {
1092                 /* AP has no more frames buffered for us */
1093                 local->pspolling = false;
1094                 return RX_CONTINUE;
1095         }
1096
1097         /* more data bit is set, let's request a new frame from the AP */
1098         ieee80211_send_pspoll(local, rx->sdata);
1099
1100         return RX_CONTINUE;
1101 }
1102
1103 static void sta_ps_start(struct sta_info *sta)
1104 {
1105         struct ieee80211_sub_if_data *sdata = sta->sdata;
1106         struct ieee80211_local *local = sdata->local;
1107         struct ps_data *ps;
1108
1109         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1110             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1111                 ps = &sdata->bss->ps;
1112         else
1113                 return;
1114
1115         atomic_inc(&ps->num_sta_ps);
1116         set_sta_flag(sta, WLAN_STA_PS_STA);
1117         if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1118                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1119         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1120                sta->sta.addr, sta->sta.aid);
1121 }
1122
1123 static void sta_ps_end(struct sta_info *sta)
1124 {
1125         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1126                sta->sta.addr, sta->sta.aid);
1127
1128         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1129                 /*
1130                  * Clear the flag only if the other one is still set
1131                  * so that the TX path won't start TX'ing new frames
1132                  * directly ... In the case that the driver flag isn't
1133                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1134                  */
1135                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1136                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1137                        sta->sta.addr, sta->sta.aid);
1138                 return;
1139         }
1140
1141         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1142         clear_sta_flag(sta, WLAN_STA_PS_STA);
1143         ieee80211_sta_ps_deliver_wakeup(sta);
1144 }
1145
1146 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1147 {
1148         struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1149         bool in_ps;
1150
1151         WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1152
1153         /* Don't let the same PS state be set twice */
1154         in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1155         if ((start && in_ps) || (!start && !in_ps))
1156                 return -EINVAL;
1157
1158         if (start)
1159                 sta_ps_start(sta_inf);
1160         else
1161                 sta_ps_end(sta_inf);
1162
1163         return 0;
1164 }
1165 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1166
1167 static ieee80211_rx_result debug_noinline
1168 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1169 {
1170         struct ieee80211_sub_if_data *sdata = rx->sdata;
1171         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1172         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1173         int tid, ac;
1174
1175         if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1176                 return RX_CONTINUE;
1177
1178         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1179             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1180                 return RX_CONTINUE;
1181
1182         /*
1183          * The device handles station powersave, so don't do anything about
1184          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1185          * it to mac80211 since they're handled.)
1186          */
1187         if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1188                 return RX_CONTINUE;
1189
1190         /*
1191          * Don't do anything if the station isn't already asleep. In
1192          * the uAPSD case, the station will probably be marked asleep,
1193          * in the PS-Poll case the station must be confused ...
1194          */
1195         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1196                 return RX_CONTINUE;
1197
1198         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1199                 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1200                         if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1201                                 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1202                         else
1203                                 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1204                 }
1205
1206                 /* Free PS Poll skb here instead of returning RX_DROP that would
1207                  * count as an dropped frame. */
1208                 dev_kfree_skb(rx->skb);
1209
1210                 return RX_QUEUED;
1211         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1212                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1213                    ieee80211_has_pm(hdr->frame_control) &&
1214                    (ieee80211_is_data_qos(hdr->frame_control) ||
1215                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1216                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1217                 ac = ieee802_1d_to_ac[tid & 7];
1218
1219                 /*
1220                  * If this AC is not trigger-enabled do nothing.
1221                  *
1222                  * NB: This could/should check a separate bitmap of trigger-
1223                  * enabled queues, but for now we only implement uAPSD w/o
1224                  * TSPEC changes to the ACs, so they're always the same.
1225                  */
1226                 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1227                         return RX_CONTINUE;
1228
1229                 /* if we are in a service period, do nothing */
1230                 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1231                         return RX_CONTINUE;
1232
1233                 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1234                         ieee80211_sta_ps_deliver_uapsd(rx->sta);
1235                 else
1236                         set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1237         }
1238
1239         return RX_CONTINUE;
1240 }
1241
1242 static ieee80211_rx_result debug_noinline
1243 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1244 {
1245         struct sta_info *sta = rx->sta;
1246         struct sk_buff *skb = rx->skb;
1247         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1248         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1249         int i;
1250
1251         if (!sta)
1252                 return RX_CONTINUE;
1253
1254         /*
1255          * Update last_rx only for IBSS packets which are for the current
1256          * BSSID and for station already AUTHORIZED to avoid keeping the
1257          * current IBSS network alive in cases where other STAs start
1258          * using different BSSID. This will also give the station another
1259          * chance to restart the authentication/authorization in case
1260          * something went wrong the first time.
1261          */
1262         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1263                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1264                                                 NL80211_IFTYPE_ADHOC);
1265                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1266                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1267                         sta->last_rx = jiffies;
1268                         if (ieee80211_is_data(hdr->frame_control) &&
1269                             !is_multicast_ether_addr(hdr->addr1)) {
1270                                 sta->last_rx_rate_idx = status->rate_idx;
1271                                 sta->last_rx_rate_flag = status->flag;
1272                                 sta->last_rx_rate_vht_flag = status->vht_flag;
1273                                 sta->last_rx_rate_vht_nss = status->vht_nss;
1274                         }
1275                 }
1276         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1277                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1278                                                 NL80211_IFTYPE_OCB);
1279                 /* OCB uses wild-card BSSID */
1280                 if (is_broadcast_ether_addr(bssid))
1281                         sta->last_rx = jiffies;
1282         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1283                 /*
1284                  * Mesh beacons will update last_rx when if they are found to
1285                  * match the current local configuration when processed.
1286                  */
1287                 sta->last_rx = jiffies;
1288                 if (ieee80211_is_data(hdr->frame_control)) {
1289                         sta->last_rx_rate_idx = status->rate_idx;
1290                         sta->last_rx_rate_flag = status->flag;
1291                         sta->last_rx_rate_vht_flag = status->vht_flag;
1292                         sta->last_rx_rate_vht_nss = status->vht_nss;
1293                 }
1294         }
1295
1296         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1297                 return RX_CONTINUE;
1298
1299         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1300                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1301
1302         sta->rx_fragments++;
1303         sta->rx_bytes += rx->skb->len;
1304         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1305                 sta->last_signal = status->signal;
1306                 ewma_add(&sta->avg_signal, -status->signal);
1307         }
1308
1309         if (status->chains) {
1310                 sta->chains = status->chains;
1311                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1312                         int signal = status->chain_signal[i];
1313
1314                         if (!(status->chains & BIT(i)))
1315                                 continue;
1316
1317                         sta->chain_signal_last[i] = signal;
1318                         ewma_add(&sta->chain_signal_avg[i], -signal);
1319                 }
1320         }
1321
1322         /*
1323          * Change STA power saving mode only at the end of a frame
1324          * exchange sequence.
1325          */
1326         if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1327             !ieee80211_has_morefrags(hdr->frame_control) &&
1328             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1329             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1330              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1331             /* PM bit is only checked in frames where it isn't reserved,
1332              * in AP mode it's reserved in non-bufferable management frames
1333              * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1334              */
1335             (!ieee80211_is_mgmt(hdr->frame_control) ||
1336              ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1337                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1338                         if (!ieee80211_has_pm(hdr->frame_control))
1339                                 sta_ps_end(sta);
1340                 } else {
1341                         if (ieee80211_has_pm(hdr->frame_control))
1342                                 sta_ps_start(sta);
1343                 }
1344         }
1345
1346         /* mesh power save support */
1347         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1348                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1349
1350         /*
1351          * Drop (qos-)data::nullfunc frames silently, since they
1352          * are used only to control station power saving mode.
1353          */
1354         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1355             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1356                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1357
1358                 /*
1359                  * If we receive a 4-addr nullfunc frame from a STA
1360                  * that was not moved to a 4-addr STA vlan yet send
1361                  * the event to userspace and for older hostapd drop
1362                  * the frame to the monitor interface.
1363                  */
1364                 if (ieee80211_has_a4(hdr->frame_control) &&
1365                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1366                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1367                       !rx->sdata->u.vlan.sta))) {
1368                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1369                                 cfg80211_rx_unexpected_4addr_frame(
1370                                         rx->sdata->dev, sta->sta.addr,
1371                                         GFP_ATOMIC);
1372                         return RX_DROP_MONITOR;
1373                 }
1374                 /*
1375                  * Update counter and free packet here to avoid
1376                  * counting this as a dropped packed.
1377                  */
1378                 sta->rx_packets++;
1379                 dev_kfree_skb(rx->skb);
1380                 return RX_QUEUED;
1381         }
1382
1383         return RX_CONTINUE;
1384 } /* ieee80211_rx_h_sta_process */
1385
1386 static ieee80211_rx_result debug_noinline
1387 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1388 {
1389         struct sk_buff *skb = rx->skb;
1390         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1391         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1392         int keyidx;
1393         int hdrlen;
1394         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1395         struct ieee80211_key *sta_ptk = NULL;
1396         int mmie_keyidx = -1;
1397         __le16 fc;
1398         const struct ieee80211_cipher_scheme *cs = NULL;
1399
1400         /*
1401          * Key selection 101
1402          *
1403          * There are four types of keys:
1404          *  - GTK (group keys)
1405          *  - IGTK (group keys for management frames)
1406          *  - PTK (pairwise keys)
1407          *  - STK (station-to-station pairwise keys)
1408          *
1409          * When selecting a key, we have to distinguish between multicast
1410          * (including broadcast) and unicast frames, the latter can only
1411          * use PTKs and STKs while the former always use GTKs and IGTKs.
1412          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1413          * unicast frames can also use key indices like GTKs. Hence, if we
1414          * don't have a PTK/STK we check the key index for a WEP key.
1415          *
1416          * Note that in a regular BSS, multicast frames are sent by the
1417          * AP only, associated stations unicast the frame to the AP first
1418          * which then multicasts it on their behalf.
1419          *
1420          * There is also a slight problem in IBSS mode: GTKs are negotiated
1421          * with each station, that is something we don't currently handle.
1422          * The spec seems to expect that one negotiates the same key with
1423          * every station but there's no such requirement; VLANs could be
1424          * possible.
1425          */
1426
1427         /*
1428          * No point in finding a key and decrypting if the frame is neither
1429          * addressed to us nor a multicast frame.
1430          */
1431         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1432                 return RX_CONTINUE;
1433
1434         /* start without a key */
1435         rx->key = NULL;
1436         fc = hdr->frame_control;
1437
1438         if (rx->sta) {
1439                 int keyid = rx->sta->ptk_idx;
1440
1441                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1442                         cs = rx->sta->cipher_scheme;
1443                         keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1444                         if (unlikely(keyid < 0))
1445                                 return RX_DROP_UNUSABLE;
1446                 }
1447                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1448         }
1449
1450         if (!ieee80211_has_protected(fc))
1451                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1452
1453         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1454                 rx->key = sta_ptk;
1455                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1456                     (status->flag & RX_FLAG_IV_STRIPPED))
1457                         return RX_CONTINUE;
1458                 /* Skip decryption if the frame is not protected. */
1459                 if (!ieee80211_has_protected(fc))
1460                         return RX_CONTINUE;
1461         } else if (mmie_keyidx >= 0) {
1462                 /* Broadcast/multicast robust management frame / BIP */
1463                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1464                     (status->flag & RX_FLAG_IV_STRIPPED))
1465                         return RX_CONTINUE;
1466
1467                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1468                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1469                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1470                 if (rx->sta)
1471                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1472                 if (!rx->key)
1473                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1474         } else if (!ieee80211_has_protected(fc)) {
1475                 /*
1476                  * The frame was not protected, so skip decryption. However, we
1477                  * need to set rx->key if there is a key that could have been
1478                  * used so that the frame may be dropped if encryption would
1479                  * have been expected.
1480                  */
1481                 struct ieee80211_key *key = NULL;
1482                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1483                 int i;
1484
1485                 if (ieee80211_is_mgmt(fc) &&
1486                     is_multicast_ether_addr(hdr->addr1) &&
1487                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1488                         rx->key = key;
1489                 else {
1490                         if (rx->sta) {
1491                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1492                                         key = rcu_dereference(rx->sta->gtk[i]);
1493                                         if (key)
1494                                                 break;
1495                                 }
1496                         }
1497                         if (!key) {
1498                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1499                                         key = rcu_dereference(sdata->keys[i]);
1500                                         if (key)
1501                                                 break;
1502                                 }
1503                         }
1504                         if (key)
1505                                 rx->key = key;
1506                 }
1507                 return RX_CONTINUE;
1508         } else {
1509                 u8 keyid;
1510
1511                 /*
1512                  * The device doesn't give us the IV so we won't be
1513                  * able to look up the key. That's ok though, we
1514                  * don't need to decrypt the frame, we just won't
1515                  * be able to keep statistics accurate.
1516                  * Except for key threshold notifications, should
1517                  * we somehow allow the driver to tell us which key
1518                  * the hardware used if this flag is set?
1519                  */
1520                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1521                     (status->flag & RX_FLAG_IV_STRIPPED))
1522                         return RX_CONTINUE;
1523
1524                 hdrlen = ieee80211_hdrlen(fc);
1525
1526                 if (cs) {
1527                         keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
1528
1529                         if (unlikely(keyidx < 0))
1530                                 return RX_DROP_UNUSABLE;
1531                 } else {
1532                         if (rx->skb->len < 8 + hdrlen)
1533                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1534                         /*
1535                          * no need to call ieee80211_wep_get_keyidx,
1536                          * it verifies a bunch of things we've done already
1537                          */
1538                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1539                         keyidx = keyid >> 6;
1540                 }
1541
1542                 /* check per-station GTK first, if multicast packet */
1543                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1544                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1545
1546                 /* if not found, try default key */
1547                 if (!rx->key) {
1548                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1549
1550                         /*
1551                          * RSNA-protected unicast frames should always be
1552                          * sent with pairwise or station-to-station keys,
1553                          * but for WEP we allow using a key index as well.
1554                          */
1555                         if (rx->key &&
1556                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1557                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1558                             !is_multicast_ether_addr(hdr->addr1))
1559                                 rx->key = NULL;
1560                 }
1561         }
1562
1563         if (rx->key) {
1564                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1565                         return RX_DROP_MONITOR;
1566
1567                 rx->key->tx_rx_count++;
1568                 /* TODO: add threshold stuff again */
1569         } else {
1570                 return RX_DROP_MONITOR;
1571         }
1572
1573         switch (rx->key->conf.cipher) {
1574         case WLAN_CIPHER_SUITE_WEP40:
1575         case WLAN_CIPHER_SUITE_WEP104:
1576                 result = ieee80211_crypto_wep_decrypt(rx);
1577                 break;
1578         case WLAN_CIPHER_SUITE_TKIP:
1579                 result = ieee80211_crypto_tkip_decrypt(rx);
1580                 break;
1581         case WLAN_CIPHER_SUITE_CCMP:
1582                 result = ieee80211_crypto_ccmp_decrypt(rx);
1583                 break;
1584         case WLAN_CIPHER_SUITE_AES_CMAC:
1585                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1586                 break;
1587         default:
1588                 result = ieee80211_crypto_hw_decrypt(rx);
1589         }
1590
1591         /* the hdr variable is invalid after the decrypt handlers */
1592
1593         /* either the frame has been decrypted or will be dropped */
1594         status->flag |= RX_FLAG_DECRYPTED;
1595
1596         return result;
1597 }
1598
1599 static inline struct ieee80211_fragment_entry *
1600 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1601                          unsigned int frag, unsigned int seq, int rx_queue,
1602                          struct sk_buff **skb)
1603 {
1604         struct ieee80211_fragment_entry *entry;
1605
1606         entry = &sdata->fragments[sdata->fragment_next++];
1607         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1608                 sdata->fragment_next = 0;
1609
1610         if (!skb_queue_empty(&entry->skb_list))
1611                 __skb_queue_purge(&entry->skb_list);
1612
1613         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1614         *skb = NULL;
1615         entry->first_frag_time = jiffies;
1616         entry->seq = seq;
1617         entry->rx_queue = rx_queue;
1618         entry->last_frag = frag;
1619         entry->ccmp = 0;
1620         entry->extra_len = 0;
1621
1622         return entry;
1623 }
1624
1625 static inline struct ieee80211_fragment_entry *
1626 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1627                           unsigned int frag, unsigned int seq,
1628                           int rx_queue, struct ieee80211_hdr *hdr)
1629 {
1630         struct ieee80211_fragment_entry *entry;
1631         int i, idx;
1632
1633         idx = sdata->fragment_next;
1634         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1635                 struct ieee80211_hdr *f_hdr;
1636
1637                 idx--;
1638                 if (idx < 0)
1639                         idx = IEEE80211_FRAGMENT_MAX - 1;
1640
1641                 entry = &sdata->fragments[idx];
1642                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1643                     entry->rx_queue != rx_queue ||
1644                     entry->last_frag + 1 != frag)
1645                         continue;
1646
1647                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1648
1649                 /*
1650                  * Check ftype and addresses are equal, else check next fragment
1651                  */
1652                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1653                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1654                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1655                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1656                         continue;
1657
1658                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1659                         __skb_queue_purge(&entry->skb_list);
1660                         continue;
1661                 }
1662                 return entry;
1663         }
1664
1665         return NULL;
1666 }
1667
1668 static ieee80211_rx_result debug_noinline
1669 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1670 {
1671         struct ieee80211_hdr *hdr;
1672         u16 sc;
1673         __le16 fc;
1674         unsigned int frag, seq;
1675         struct ieee80211_fragment_entry *entry;
1676         struct sk_buff *skb;
1677         struct ieee80211_rx_status *status;
1678
1679         hdr = (struct ieee80211_hdr *)rx->skb->data;
1680         fc = hdr->frame_control;
1681
1682         if (ieee80211_is_ctl(fc))
1683                 return RX_CONTINUE;
1684
1685         sc = le16_to_cpu(hdr->seq_ctrl);
1686         frag = sc & IEEE80211_SCTL_FRAG;
1687
1688         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1689                 goto out;
1690
1691         if (is_multicast_ether_addr(hdr->addr1)) {
1692                 rx->local->dot11MulticastReceivedFrameCount++;
1693                 goto out;
1694         }
1695
1696         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1697
1698         if (skb_linearize(rx->skb))
1699                 return RX_DROP_UNUSABLE;
1700
1701         /*
1702          *  skb_linearize() might change the skb->data and
1703          *  previously cached variables (in this case, hdr) need to
1704          *  be refreshed with the new data.
1705          */
1706         hdr = (struct ieee80211_hdr *)rx->skb->data;
1707         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1708
1709         if (frag == 0) {
1710                 /* This is the first fragment of a new frame. */
1711                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1712                                                  rx->seqno_idx, &(rx->skb));
1713                 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1714                     ieee80211_has_protected(fc)) {
1715                         int queue = rx->security_idx;
1716                         /* Store CCMP PN so that we can verify that the next
1717                          * fragment has a sequential PN value. */
1718                         entry->ccmp = 1;
1719                         memcpy(entry->last_pn,
1720                                rx->key->u.ccmp.rx_pn[queue],
1721                                IEEE80211_CCMP_PN_LEN);
1722                 }
1723                 return RX_QUEUED;
1724         }
1725
1726         /* This is a fragment for a frame that should already be pending in
1727          * fragment cache. Add this fragment to the end of the pending entry.
1728          */
1729         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1730                                           rx->seqno_idx, hdr);
1731         if (!entry) {
1732                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1733                 return RX_DROP_MONITOR;
1734         }
1735
1736         /* Verify that MPDUs within one MSDU have sequential PN values.
1737          * (IEEE 802.11i, 8.3.3.4.5) */
1738         if (entry->ccmp) {
1739                 int i;
1740                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1741                 int queue;
1742                 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1743                         return RX_DROP_UNUSABLE;
1744                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1745                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1746                         pn[i]++;
1747                         if (pn[i])
1748                                 break;
1749                 }
1750                 queue = rx->security_idx;
1751                 rpn = rx->key->u.ccmp.rx_pn[queue];
1752                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1753                         return RX_DROP_UNUSABLE;
1754                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1755         }
1756
1757         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1758         __skb_queue_tail(&entry->skb_list, rx->skb);
1759         entry->last_frag = frag;
1760         entry->extra_len += rx->skb->len;
1761         if (ieee80211_has_morefrags(fc)) {
1762                 rx->skb = NULL;
1763                 return RX_QUEUED;
1764         }
1765
1766         rx->skb = __skb_dequeue(&entry->skb_list);
1767         if (skb_tailroom(rx->skb) < entry->extra_len) {
1768                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1769                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1770                                               GFP_ATOMIC))) {
1771                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1772                         __skb_queue_purge(&entry->skb_list);
1773                         return RX_DROP_UNUSABLE;
1774                 }
1775         }
1776         while ((skb = __skb_dequeue(&entry->skb_list))) {
1777                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1778                 dev_kfree_skb(skb);
1779         }
1780
1781         /* Complete frame has been reassembled - process it now */
1782         status = IEEE80211_SKB_RXCB(rx->skb);
1783         status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1784
1785  out:
1786         if (rx->sta)
1787                 rx->sta->rx_packets++;
1788         ieee80211_led_rx(rx->local);
1789         return RX_CONTINUE;
1790 }
1791
1792 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1793 {
1794         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1795                 return -EACCES;
1796
1797         return 0;
1798 }
1799
1800 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1801 {
1802         struct sk_buff *skb = rx->skb;
1803         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1804
1805         /*
1806          * Pass through unencrypted frames if the hardware has
1807          * decrypted them already.
1808          */
1809         if (status->flag & RX_FLAG_DECRYPTED)
1810                 return 0;
1811
1812         /* Drop unencrypted frames if key is set. */
1813         if (unlikely(!ieee80211_has_protected(fc) &&
1814                      !ieee80211_is_nullfunc(fc) &&
1815                      ieee80211_is_data(fc) &&
1816                      (rx->key || rx->sdata->drop_unencrypted)))
1817                 return -EACCES;
1818
1819         return 0;
1820 }
1821
1822 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1823 {
1824         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1825         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1826         __le16 fc = hdr->frame_control;
1827
1828         /*
1829          * Pass through unencrypted frames if the hardware has
1830          * decrypted them already.
1831          */
1832         if (status->flag & RX_FLAG_DECRYPTED)
1833                 return 0;
1834
1835         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1836                 if (unlikely(!ieee80211_has_protected(fc) &&
1837                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1838                              rx->key)) {
1839                         if (ieee80211_is_deauth(fc) ||
1840                             ieee80211_is_disassoc(fc))
1841                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1842                                                              rx->skb->data,
1843                                                              rx->skb->len);
1844                         return -EACCES;
1845                 }
1846                 /* BIP does not use Protected field, so need to check MMIE */
1847                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1848                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1849                         if (ieee80211_is_deauth(fc) ||
1850                             ieee80211_is_disassoc(fc))
1851                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1852                                                              rx->skb->data,
1853                                                              rx->skb->len);
1854                         return -EACCES;
1855                 }
1856                 /*
1857                  * When using MFP, Action frames are not allowed prior to
1858                  * having configured keys.
1859                  */
1860                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1861                              ieee80211_is_robust_mgmt_frame(rx->skb)))
1862                         return -EACCES;
1863         }
1864
1865         return 0;
1866 }
1867
1868 static int
1869 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1870 {
1871         struct ieee80211_sub_if_data *sdata = rx->sdata;
1872         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1873         bool check_port_control = false;
1874         struct ethhdr *ehdr;
1875         int ret;
1876
1877         *port_control = false;
1878         if (ieee80211_has_a4(hdr->frame_control) &&
1879             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1880                 return -1;
1881
1882         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1883             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1884
1885                 if (!sdata->u.mgd.use_4addr)
1886                         return -1;
1887                 else
1888                         check_port_control = true;
1889         }
1890
1891         if (is_multicast_ether_addr(hdr->addr1) &&
1892             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1893                 return -1;
1894
1895         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1896         if (ret < 0)
1897                 return ret;
1898
1899         ehdr = (struct ethhdr *) rx->skb->data;
1900         if (ehdr->h_proto == rx->sdata->control_port_protocol)
1901                 *port_control = true;
1902         else if (check_port_control)
1903                 return -1;
1904
1905         return 0;
1906 }
1907
1908 /*
1909  * requires that rx->skb is a frame with ethernet header
1910  */
1911 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1912 {
1913         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1914                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1915         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1916
1917         /*
1918          * Allow EAPOL frames to us/the PAE group address regardless
1919          * of whether the frame was encrypted or not.
1920          */
1921         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1922             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1923              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
1924                 return true;
1925
1926         if (ieee80211_802_1x_port_control(rx) ||
1927             ieee80211_drop_unencrypted(rx, fc))
1928                 return false;
1929
1930         return true;
1931 }
1932
1933 /*
1934  * requires that rx->skb is a frame with ethernet header
1935  */
1936 static void
1937 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1938 {
1939         struct ieee80211_sub_if_data *sdata = rx->sdata;
1940         struct net_device *dev = sdata->dev;
1941         struct sk_buff *skb, *xmit_skb;
1942         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1943         struct sta_info *dsta;
1944         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1945
1946         skb = rx->skb;
1947         xmit_skb = NULL;
1948
1949         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1950              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1951             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1952             (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1953             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1954                 if (is_multicast_ether_addr(ehdr->h_dest)) {
1955                         /*
1956                          * send multicast frames both to higher layers in
1957                          * local net stack and back to the wireless medium
1958                          */
1959                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
1960                         if (!xmit_skb)
1961                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
1962                                                     dev->name);
1963                 } else {
1964                         dsta = sta_info_get(sdata, skb->data);
1965                         if (dsta) {
1966                                 /*
1967                                  * The destination station is associated to
1968                                  * this AP (in this VLAN), so send the frame
1969                                  * directly to it and do not pass it to local
1970                                  * net stack.
1971                                  */
1972                                 xmit_skb = skb;
1973                                 skb = NULL;
1974                         }
1975                 }
1976         }
1977
1978 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1979         if (skb) {
1980                 /* 'align' will only take the values 0 or 2 here since all
1981                  * frames are required to be aligned to 2-byte boundaries
1982                  * when being passed to mac80211; the code here works just
1983                  * as well if that isn't true, but mac80211 assumes it can
1984                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
1985                  */
1986                 int align;
1987
1988                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
1989                 if (align) {
1990                         if (WARN_ON(skb_headroom(skb) < 3)) {
1991                                 dev_kfree_skb(skb);
1992                                 skb = NULL;
1993                         } else {
1994                                 u8 *data = skb->data;
1995                                 size_t len = skb_headlen(skb);
1996                                 skb->data -= align;
1997                                 memmove(skb->data, data, len);
1998                                 skb_set_tail_pointer(skb, len);
1999                         }
2000                 }
2001         }
2002 #endif
2003
2004         if (skb) {
2005                 /* deliver to local stack */
2006                 skb->protocol = eth_type_trans(skb, dev);
2007                 memset(skb->cb, 0, sizeof(skb->cb));
2008                 if (rx->local->napi)
2009                         napi_gro_receive(rx->local->napi, skb);
2010                 else
2011                         netif_receive_skb(skb);
2012         }
2013
2014         if (xmit_skb) {
2015                 /*
2016                  * Send to wireless media and increase priority by 256 to
2017                  * keep the received priority instead of reclassifying
2018                  * the frame (see cfg80211_classify8021d).
2019                  */
2020                 xmit_skb->priority += 256;
2021                 xmit_skb->protocol = htons(ETH_P_802_3);
2022                 skb_reset_network_header(xmit_skb);
2023                 skb_reset_mac_header(xmit_skb);
2024                 dev_queue_xmit(xmit_skb);
2025         }
2026 }
2027
2028 static ieee80211_rx_result debug_noinline
2029 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2030 {
2031         struct net_device *dev = rx->sdata->dev;
2032         struct sk_buff *skb = rx->skb;
2033         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2034         __le16 fc = hdr->frame_control;
2035         struct sk_buff_head frame_list;
2036         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2037
2038         if (unlikely(!ieee80211_is_data(fc)))
2039                 return RX_CONTINUE;
2040
2041         if (unlikely(!ieee80211_is_data_present(fc)))
2042                 return RX_DROP_MONITOR;
2043
2044         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2045                 return RX_CONTINUE;
2046
2047         if (ieee80211_has_a4(hdr->frame_control) &&
2048             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2049             !rx->sdata->u.vlan.sta)
2050                 return RX_DROP_UNUSABLE;
2051
2052         if (is_multicast_ether_addr(hdr->addr1) &&
2053             ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2054               rx->sdata->u.vlan.sta) ||
2055              (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2056               rx->sdata->u.mgd.use_4addr)))
2057                 return RX_DROP_UNUSABLE;
2058
2059         skb->dev = dev;
2060         __skb_queue_head_init(&frame_list);
2061
2062         if (skb_linearize(skb))
2063                 return RX_DROP_UNUSABLE;
2064
2065         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2066                                  rx->sdata->vif.type,
2067                                  rx->local->hw.extra_tx_headroom, true);
2068
2069         while (!skb_queue_empty(&frame_list)) {
2070                 rx->skb = __skb_dequeue(&frame_list);
2071
2072                 if (!ieee80211_frame_allowed(rx, fc)) {
2073                         dev_kfree_skb(rx->skb);
2074                         continue;
2075                 }
2076                 dev->stats.rx_packets++;
2077                 dev->stats.rx_bytes += rx->skb->len;
2078
2079                 ieee80211_deliver_skb(rx);
2080         }
2081
2082         return RX_QUEUED;
2083 }
2084
2085 #ifdef CONFIG_MAC80211_MESH
2086 static ieee80211_rx_result
2087 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2088 {
2089         struct ieee80211_hdr *fwd_hdr, *hdr;
2090         struct ieee80211_tx_info *info;
2091         struct ieee80211s_hdr *mesh_hdr;
2092         struct sk_buff *skb = rx->skb, *fwd_skb;
2093         struct ieee80211_local *local = rx->local;
2094         struct ieee80211_sub_if_data *sdata = rx->sdata;
2095         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2096         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2097         u16 q, hdrlen;
2098
2099         hdr = (struct ieee80211_hdr *) skb->data;
2100         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2101
2102         /* make sure fixed part of mesh header is there, also checks skb len */
2103         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2104                 return RX_DROP_MONITOR;
2105
2106         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2107
2108         /* make sure full mesh header is there, also checks skb len */
2109         if (!pskb_may_pull(rx->skb,
2110                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2111                 return RX_DROP_MONITOR;
2112
2113         /* reload pointers */
2114         hdr = (struct ieee80211_hdr *) skb->data;
2115         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2116
2117         /* frame is in RMC, don't forward */
2118         if (ieee80211_is_data(hdr->frame_control) &&
2119             is_multicast_ether_addr(hdr->addr1) &&
2120             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2121                 return RX_DROP_MONITOR;
2122
2123         if (!ieee80211_is_data(hdr->frame_control) ||
2124             !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2125                 return RX_CONTINUE;
2126
2127         if (!mesh_hdr->ttl)
2128                 return RX_DROP_MONITOR;
2129
2130         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2131                 struct mesh_path *mppath;
2132                 char *proxied_addr;
2133                 char *mpp_addr;
2134
2135                 if (is_multicast_ether_addr(hdr->addr1)) {
2136                         mpp_addr = hdr->addr3;
2137                         proxied_addr = mesh_hdr->eaddr1;
2138                 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2139                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2140                         mpp_addr = hdr->addr4;
2141                         proxied_addr = mesh_hdr->eaddr2;
2142                 } else {
2143                         return RX_DROP_MONITOR;
2144                 }
2145
2146                 rcu_read_lock();
2147                 mppath = mpp_path_lookup(sdata, proxied_addr);
2148                 if (!mppath) {
2149                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2150                 } else {
2151                         spin_lock_bh(&mppath->state_lock);
2152                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2153                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2154                         spin_unlock_bh(&mppath->state_lock);
2155                 }
2156                 rcu_read_unlock();
2157         }
2158
2159         /* Frame has reached destination.  Don't forward */
2160         if (!is_multicast_ether_addr(hdr->addr1) &&
2161             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2162                 return RX_CONTINUE;
2163
2164         q = ieee80211_select_queue_80211(sdata, skb, hdr);
2165         if (ieee80211_queue_stopped(&local->hw, q)) {
2166                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2167                 return RX_DROP_MONITOR;
2168         }
2169         skb_set_queue_mapping(skb, q);
2170
2171         if (!--mesh_hdr->ttl) {
2172                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2173                 goto out;
2174         }
2175
2176         if (!ifmsh->mshcfg.dot11MeshForwarding)
2177                 goto out;
2178
2179         fwd_skb = skb_copy(skb, GFP_ATOMIC);
2180         if (!fwd_skb) {
2181                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2182                                     sdata->name);
2183                 goto out;
2184         }
2185
2186         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2187         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2188         info = IEEE80211_SKB_CB(fwd_skb);
2189         memset(info, 0, sizeof(*info));
2190         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2191         info->control.vif = &rx->sdata->vif;
2192         info->control.jiffies = jiffies;
2193         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2194                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2195                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2196                 /* update power mode indication when forwarding */
2197                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2198         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2199                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2200                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2201         } else {
2202                 /* unable to resolve next hop */
2203                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2204                                    fwd_hdr->addr3, 0,
2205                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2206                                    fwd_hdr->addr2);
2207                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2208                 kfree_skb(fwd_skb);
2209                 return RX_DROP_MONITOR;
2210         }
2211
2212         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2213         ieee80211_add_pending_skb(local, fwd_skb);
2214  out:
2215         if (is_multicast_ether_addr(hdr->addr1) ||
2216             sdata->dev->flags & IFF_PROMISC)
2217                 return RX_CONTINUE;
2218         else
2219                 return RX_DROP_MONITOR;
2220 }
2221 #endif
2222
2223 static ieee80211_rx_result debug_noinline
2224 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2225 {
2226         struct ieee80211_sub_if_data *sdata = rx->sdata;
2227         struct ieee80211_local *local = rx->local;
2228         struct net_device *dev = sdata->dev;
2229         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2230         __le16 fc = hdr->frame_control;
2231         bool port_control;
2232         int err;
2233
2234         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2235                 return RX_CONTINUE;
2236
2237         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2238                 return RX_DROP_MONITOR;
2239
2240         /*
2241          * Send unexpected-4addr-frame event to hostapd. For older versions,
2242          * also drop the frame to cooked monitor interfaces.
2243          */
2244         if (ieee80211_has_a4(hdr->frame_control) &&
2245             sdata->vif.type == NL80211_IFTYPE_AP) {
2246                 if (rx->sta &&
2247                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2248                         cfg80211_rx_unexpected_4addr_frame(
2249                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2250                 return RX_DROP_MONITOR;
2251         }
2252
2253         err = __ieee80211_data_to_8023(rx, &port_control);
2254         if (unlikely(err))
2255                 return RX_DROP_UNUSABLE;
2256
2257         if (!ieee80211_frame_allowed(rx, fc))
2258                 return RX_DROP_MONITOR;
2259
2260         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2261             unlikely(port_control) && sdata->bss) {
2262                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2263                                      u.ap);
2264                 dev = sdata->dev;
2265                 rx->sdata = sdata;
2266         }
2267
2268         rx->skb->dev = dev;
2269
2270         dev->stats.rx_packets++;
2271         dev->stats.rx_bytes += rx->skb->len;
2272
2273         if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2274             !is_multicast_ether_addr(
2275                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2276             (!local->scanning &&
2277              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2278                         mod_timer(&local->dynamic_ps_timer, jiffies +
2279                          msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2280         }
2281
2282         ieee80211_deliver_skb(rx);
2283
2284         return RX_QUEUED;
2285 }
2286
2287 static ieee80211_rx_result debug_noinline
2288 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2289 {
2290         struct sk_buff *skb = rx->skb;
2291         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2292         struct tid_ampdu_rx *tid_agg_rx;
2293         u16 start_seq_num;
2294         u16 tid;
2295
2296         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2297                 return RX_CONTINUE;
2298
2299         if (ieee80211_is_back_req(bar->frame_control)) {
2300                 struct {
2301                         __le16 control, start_seq_num;
2302                 } __packed bar_data;
2303
2304                 if (!rx->sta)
2305                         return RX_DROP_MONITOR;
2306
2307                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2308                                   &bar_data, sizeof(bar_data)))
2309                         return RX_DROP_MONITOR;
2310
2311                 tid = le16_to_cpu(bar_data.control) >> 12;
2312
2313                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2314                 if (!tid_agg_rx)
2315                         return RX_DROP_MONITOR;
2316
2317                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2318
2319                 /* reset session timer */
2320                 if (tid_agg_rx->timeout)
2321                         mod_timer(&tid_agg_rx->session_timer,
2322                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2323
2324                 spin_lock(&tid_agg_rx->reorder_lock);
2325                 /* release stored frames up to start of BAR */
2326                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2327                                                  start_seq_num, frames);
2328                 spin_unlock(&tid_agg_rx->reorder_lock);
2329
2330                 kfree_skb(skb);
2331                 return RX_QUEUED;
2332         }
2333
2334         /*
2335          * After this point, we only want management frames,
2336          * so we can drop all remaining control frames to
2337          * cooked monitor interfaces.
2338          */
2339         return RX_DROP_MONITOR;
2340 }
2341
2342 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2343                                            struct ieee80211_mgmt *mgmt,
2344                                            size_t len)
2345 {
2346         struct ieee80211_local *local = sdata->local;
2347         struct sk_buff *skb;
2348         struct ieee80211_mgmt *resp;
2349
2350         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2351                 /* Not to own unicast address */
2352                 return;
2353         }
2354
2355         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2356             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2357                 /* Not from the current AP or not associated yet. */
2358                 return;
2359         }
2360
2361         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2362                 /* Too short SA Query request frame */
2363                 return;
2364         }
2365
2366         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2367         if (skb == NULL)
2368                 return;
2369
2370         skb_reserve(skb, local->hw.extra_tx_headroom);
2371         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2372         memset(resp, 0, 24);
2373         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2374         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2375         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2376         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2377                                           IEEE80211_STYPE_ACTION);
2378         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2379         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2380         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2381         memcpy(resp->u.action.u.sa_query.trans_id,
2382                mgmt->u.action.u.sa_query.trans_id,
2383                WLAN_SA_QUERY_TR_ID_LEN);
2384
2385         ieee80211_tx_skb(sdata, skb);
2386 }
2387
2388 static ieee80211_rx_result debug_noinline
2389 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2390 {
2391         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2392         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2393
2394         /*
2395          * From here on, look only at management frames.
2396          * Data and control frames are already handled,
2397          * and unknown (reserved) frames are useless.
2398          */
2399         if (rx->skb->len < 24)
2400                 return RX_DROP_MONITOR;
2401
2402         if (!ieee80211_is_mgmt(mgmt->frame_control))
2403                 return RX_DROP_MONITOR;
2404
2405         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2406             ieee80211_is_beacon(mgmt->frame_control) &&
2407             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2408                 int sig = 0;
2409
2410                 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2411                         sig = status->signal;
2412
2413                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2414                                             rx->skb->data, rx->skb->len,
2415                                             status->freq, sig);
2416                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2417         }
2418
2419         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2420                 return RX_DROP_MONITOR;
2421
2422         if (ieee80211_drop_unencrypted_mgmt(rx))
2423                 return RX_DROP_UNUSABLE;
2424
2425         return RX_CONTINUE;
2426 }
2427
2428 static ieee80211_rx_result debug_noinline
2429 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2430 {
2431         struct ieee80211_local *local = rx->local;
2432         struct ieee80211_sub_if_data *sdata = rx->sdata;
2433         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2434         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2435         int len = rx->skb->len;
2436
2437         if (!ieee80211_is_action(mgmt->frame_control))
2438                 return RX_CONTINUE;
2439
2440         /* drop too small frames */
2441         if (len < IEEE80211_MIN_ACTION_SIZE)
2442                 return RX_DROP_UNUSABLE;
2443
2444         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2445             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2446             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2447                 return RX_DROP_UNUSABLE;
2448
2449         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2450                 return RX_DROP_UNUSABLE;
2451
2452         switch (mgmt->u.action.category) {
2453         case WLAN_CATEGORY_HT:
2454                 /* reject HT action frames from stations not supporting HT */
2455                 if (!rx->sta->sta.ht_cap.ht_supported)
2456                         goto invalid;
2457
2458                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2459                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2460                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2461                     sdata->vif.type != NL80211_IFTYPE_AP &&
2462                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2463                         break;
2464
2465                 /* verify action & smps_control/chanwidth are present */
2466                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2467                         goto invalid;
2468
2469                 switch (mgmt->u.action.u.ht_smps.action) {
2470                 case WLAN_HT_ACTION_SMPS: {
2471                         struct ieee80211_supported_band *sband;
2472                         enum ieee80211_smps_mode smps_mode;
2473
2474                         /* convert to HT capability */
2475                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2476                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2477                                 smps_mode = IEEE80211_SMPS_OFF;
2478                                 break;
2479                         case WLAN_HT_SMPS_CONTROL_STATIC:
2480                                 smps_mode = IEEE80211_SMPS_STATIC;
2481                                 break;
2482                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2483                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2484                                 break;
2485                         default:
2486                                 goto invalid;
2487                         }
2488
2489                         /* if no change do nothing */
2490                         if (rx->sta->sta.smps_mode == smps_mode)
2491                                 goto handled;
2492                         rx->sta->sta.smps_mode = smps_mode;
2493
2494                         sband = rx->local->hw.wiphy->bands[status->band];
2495
2496                         rate_control_rate_update(local, sband, rx->sta,
2497                                                  IEEE80211_RC_SMPS_CHANGED);
2498                         goto handled;
2499                 }
2500                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2501                         struct ieee80211_supported_band *sband;
2502                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2503                         enum ieee80211_sta_rx_bandwidth new_bw;
2504
2505                         /* If it doesn't support 40 MHz it can't change ... */
2506                         if (!(rx->sta->sta.ht_cap.cap &
2507                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2508                                 goto handled;
2509
2510                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2511                                 new_bw = IEEE80211_STA_RX_BW_20;
2512                         else
2513                                 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2514
2515                         if (rx->sta->sta.bandwidth == new_bw)
2516                                 goto handled;
2517
2518                         sband = rx->local->hw.wiphy->bands[status->band];
2519
2520                         rate_control_rate_update(local, sband, rx->sta,
2521                                                  IEEE80211_RC_BW_CHANGED);
2522                         goto handled;
2523                 }
2524                 default:
2525                         goto invalid;
2526                 }
2527
2528                 break;
2529         case WLAN_CATEGORY_PUBLIC:
2530                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2531                         goto invalid;
2532                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2533                         break;
2534                 if (!rx->sta)
2535                         break;
2536                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2537                         break;
2538                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2539                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2540                         break;
2541                 if (len < offsetof(struct ieee80211_mgmt,
2542                                    u.action.u.ext_chan_switch.variable))
2543                         goto invalid;
2544                 goto queue;
2545         case WLAN_CATEGORY_VHT:
2546                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2547                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2548                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2549                     sdata->vif.type != NL80211_IFTYPE_AP &&
2550                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2551                         break;
2552
2553                 /* verify action code is present */
2554                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2555                         goto invalid;
2556
2557                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2558                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2559                         u8 opmode;
2560
2561                         /* verify opmode is present */
2562                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2563                                 goto invalid;
2564
2565                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2566
2567                         ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2568                                                     opmode, status->band,
2569                                                     false);
2570                         goto handled;
2571                 }
2572                 default:
2573                         break;
2574                 }
2575                 break;
2576         case WLAN_CATEGORY_BACK:
2577                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2578                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2579                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2580                     sdata->vif.type != NL80211_IFTYPE_AP &&
2581                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2582                         break;
2583
2584                 /* verify action_code is present */
2585                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2586                         break;
2587
2588                 switch (mgmt->u.action.u.addba_req.action_code) {
2589                 case WLAN_ACTION_ADDBA_REQ:
2590                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2591                                    sizeof(mgmt->u.action.u.addba_req)))
2592                                 goto invalid;
2593                         break;
2594                 case WLAN_ACTION_ADDBA_RESP:
2595                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2596                                    sizeof(mgmt->u.action.u.addba_resp)))
2597                                 goto invalid;
2598                         break;
2599                 case WLAN_ACTION_DELBA:
2600                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2601                                    sizeof(mgmt->u.action.u.delba)))
2602                                 goto invalid;
2603                         break;
2604                 default:
2605                         goto invalid;
2606                 }
2607
2608                 goto queue;
2609         case WLAN_CATEGORY_SPECTRUM_MGMT:
2610                 /* verify action_code is present */
2611                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2612                         break;
2613
2614                 switch (mgmt->u.action.u.measurement.action_code) {
2615                 case WLAN_ACTION_SPCT_MSR_REQ:
2616                         if (status->band != IEEE80211_BAND_5GHZ)
2617                                 break;
2618
2619                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2620                                    sizeof(mgmt->u.action.u.measurement)))
2621                                 break;
2622
2623                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2624                                 break;
2625
2626                         ieee80211_process_measurement_req(sdata, mgmt, len);
2627                         goto handled;
2628                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2629                         u8 *bssid;
2630                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2631                                    sizeof(mgmt->u.action.u.chan_switch)))
2632                                 break;
2633
2634                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2635                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2636                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2637                                 break;
2638
2639                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2640                                 bssid = sdata->u.mgd.bssid;
2641                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2642                                 bssid = sdata->u.ibss.bssid;
2643                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2644                                 bssid = mgmt->sa;
2645                         else
2646                                 break;
2647
2648                         if (!ether_addr_equal(mgmt->bssid, bssid))
2649                                 break;
2650
2651                         goto queue;
2652                         }
2653                 }
2654                 break;
2655         case WLAN_CATEGORY_SA_QUERY:
2656                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2657                            sizeof(mgmt->u.action.u.sa_query)))
2658                         break;
2659
2660                 switch (mgmt->u.action.u.sa_query.action) {
2661                 case WLAN_ACTION_SA_QUERY_REQUEST:
2662                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2663                                 break;
2664                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2665                         goto handled;
2666                 }
2667                 break;
2668         case WLAN_CATEGORY_SELF_PROTECTED:
2669                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2670                            sizeof(mgmt->u.action.u.self_prot.action_code)))
2671                         break;
2672
2673                 switch (mgmt->u.action.u.self_prot.action_code) {
2674                 case WLAN_SP_MESH_PEERING_OPEN:
2675                 case WLAN_SP_MESH_PEERING_CLOSE:
2676                 case WLAN_SP_MESH_PEERING_CONFIRM:
2677                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2678                                 goto invalid;
2679                         if (sdata->u.mesh.user_mpm)
2680                                 /* userspace handles this frame */
2681                                 break;
2682                         goto queue;
2683                 case WLAN_SP_MGK_INFORM:
2684                 case WLAN_SP_MGK_ACK:
2685                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2686                                 goto invalid;
2687                         break;
2688                 }
2689                 break;
2690         case WLAN_CATEGORY_MESH_ACTION:
2691                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2692                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
2693                         break;
2694
2695                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2696                         break;
2697                 if (mesh_action_is_path_sel(mgmt) &&
2698                     !mesh_path_sel_is_hwmp(sdata))
2699                         break;
2700                 goto queue;
2701         }
2702
2703         return RX_CONTINUE;
2704
2705  invalid:
2706         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2707         /* will return in the next handlers */
2708         return RX_CONTINUE;
2709
2710  handled:
2711         if (rx->sta)
2712                 rx->sta->rx_packets++;
2713         dev_kfree_skb(rx->skb);
2714         return RX_QUEUED;
2715
2716  queue:
2717         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2718         skb_queue_tail(&sdata->skb_queue, rx->skb);
2719         ieee80211_queue_work(&local->hw, &sdata->work);
2720         if (rx->sta)
2721                 rx->sta->rx_packets++;
2722         return RX_QUEUED;
2723 }
2724
2725 static ieee80211_rx_result debug_noinline
2726 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2727 {
2728         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2729         int sig = 0;
2730
2731         /* skip known-bad action frames and return them in the next handler */
2732         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2733                 return RX_CONTINUE;
2734
2735         /*
2736          * Getting here means the kernel doesn't know how to handle
2737          * it, but maybe userspace does ... include returned frames
2738          * so userspace can register for those to know whether ones
2739          * it transmitted were processed or returned.
2740          */
2741
2742         if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2743                 sig = status->signal;
2744
2745         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2746                              rx->skb->data, rx->skb->len, 0)) {
2747                 if (rx->sta)
2748                         rx->sta->rx_packets++;
2749                 dev_kfree_skb(rx->skb);
2750                 return RX_QUEUED;
2751         }
2752
2753         return RX_CONTINUE;
2754 }
2755
2756 static ieee80211_rx_result debug_noinline
2757 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2758 {
2759         struct ieee80211_local *local = rx->local;
2760         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2761         struct sk_buff *nskb;
2762         struct ieee80211_sub_if_data *sdata = rx->sdata;
2763         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2764
2765         if (!ieee80211_is_action(mgmt->frame_control))
2766                 return RX_CONTINUE;
2767
2768         /*
2769          * For AP mode, hostapd is responsible for handling any action
2770          * frames that we didn't handle, including returning unknown
2771          * ones. For all other modes we will return them to the sender,
2772          * setting the 0x80 bit in the action category, as required by
2773          * 802.11-2012 9.24.4.
2774          * Newer versions of hostapd shall also use the management frame
2775          * registration mechanisms, but older ones still use cooked
2776          * monitor interfaces so push all frames there.
2777          */
2778         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2779             (sdata->vif.type == NL80211_IFTYPE_AP ||
2780              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2781                 return RX_DROP_MONITOR;
2782
2783         if (is_multicast_ether_addr(mgmt->da))
2784                 return RX_DROP_MONITOR;
2785
2786         /* do not return rejected action frames */
2787         if (mgmt->u.action.category & 0x80)
2788                 return RX_DROP_UNUSABLE;
2789
2790         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2791                                GFP_ATOMIC);
2792         if (nskb) {
2793                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2794
2795                 nmgmt->u.action.category |= 0x80;
2796                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2797                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2798
2799                 memset(nskb->cb, 0, sizeof(nskb->cb));
2800
2801                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2802                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2803
2804                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2805                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2806                                       IEEE80211_TX_CTL_NO_CCK_RATE;
2807                         if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2808                                 info->hw_queue =
2809                                         local->hw.offchannel_tx_hw_queue;
2810                 }
2811
2812                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2813                                             status->band);
2814         }
2815         dev_kfree_skb(rx->skb);
2816         return RX_QUEUED;
2817 }
2818
2819 static ieee80211_rx_result debug_noinline
2820 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2821 {
2822         struct ieee80211_sub_if_data *sdata = rx->sdata;
2823         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2824         __le16 stype;
2825
2826         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2827
2828         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2829             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2830             sdata->vif.type != NL80211_IFTYPE_OCB &&
2831             sdata->vif.type != NL80211_IFTYPE_STATION)
2832                 return RX_DROP_MONITOR;
2833
2834         switch (stype) {
2835         case cpu_to_le16(IEEE80211_STYPE_AUTH):
2836         case cpu_to_le16(IEEE80211_STYPE_BEACON):
2837         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2838                 /* process for all: mesh, mlme, ibss */
2839                 break;
2840         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2841         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2842         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2843         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2844                 if (is_multicast_ether_addr(mgmt->da) &&
2845                     !is_broadcast_ether_addr(mgmt->da))
2846                         return RX_DROP_MONITOR;
2847
2848                 /* process only for station */
2849                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2850                         return RX_DROP_MONITOR;
2851                 break;
2852         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2853                 /* process only for ibss and mesh */
2854                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2855                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2856                         return RX_DROP_MONITOR;
2857                 break;
2858         default:
2859                 return RX_DROP_MONITOR;
2860         }
2861
2862         /* queue up frame and kick off work to process it */
2863         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2864         skb_queue_tail(&sdata->skb_queue, rx->skb);
2865         ieee80211_queue_work(&rx->local->hw, &sdata->work);
2866         if (rx->sta)
2867                 rx->sta->rx_packets++;
2868
2869         return RX_QUEUED;
2870 }
2871
2872 /* TODO: use IEEE80211_RX_FRAGMENTED */
2873 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2874                                         struct ieee80211_rate *rate)
2875 {
2876         struct ieee80211_sub_if_data *sdata;
2877         struct ieee80211_local *local = rx->local;
2878         struct sk_buff *skb = rx->skb, *skb2;
2879         struct net_device *prev_dev = NULL;
2880         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2881         int needed_headroom;
2882
2883         /*
2884          * If cooked monitor has been processed already, then
2885          * don't do it again. If not, set the flag.
2886          */
2887         if (rx->flags & IEEE80211_RX_CMNTR)
2888                 goto out_free_skb;
2889         rx->flags |= IEEE80211_RX_CMNTR;
2890
2891         /* If there are no cooked monitor interfaces, just free the SKB */
2892         if (!local->cooked_mntrs)
2893                 goto out_free_skb;
2894
2895         /* room for the radiotap header based on driver features */
2896         needed_headroom = ieee80211_rx_radiotap_space(local, status);
2897
2898         if (skb_headroom(skb) < needed_headroom &&
2899             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2900                 goto out_free_skb;
2901
2902         /* prepend radiotap information */
2903         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2904                                          false);
2905
2906         skb_set_mac_header(skb, 0);
2907         skb->ip_summed = CHECKSUM_UNNECESSARY;
2908         skb->pkt_type = PACKET_OTHERHOST;
2909         skb->protocol = htons(ETH_P_802_2);
2910
2911         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2912                 if (!ieee80211_sdata_running(sdata))
2913                         continue;
2914
2915                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2916                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2917                         continue;
2918
2919                 if (prev_dev) {
2920                         skb2 = skb_clone(skb, GFP_ATOMIC);
2921                         if (skb2) {
2922                                 skb2->dev = prev_dev;
2923                                 netif_receive_skb(skb2);
2924                         }
2925                 }
2926
2927                 prev_dev = sdata->dev;
2928                 sdata->dev->stats.rx_packets++;
2929                 sdata->dev->stats.rx_bytes += skb->len;
2930         }
2931
2932         if (prev_dev) {
2933                 skb->dev = prev_dev;
2934                 netif_receive_skb(skb);
2935                 return;
2936         }
2937
2938  out_free_skb:
2939         dev_kfree_skb(skb);
2940 }
2941
2942 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2943                                          ieee80211_rx_result res)
2944 {
2945         switch (res) {
2946         case RX_DROP_MONITOR:
2947                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2948                 if (rx->sta)
2949                         rx->sta->rx_dropped++;
2950                 /* fall through */
2951         case RX_CONTINUE: {
2952                 struct ieee80211_rate *rate = NULL;
2953                 struct ieee80211_supported_band *sband;
2954                 struct ieee80211_rx_status *status;
2955
2956                 status = IEEE80211_SKB_RXCB((rx->skb));
2957
2958                 sband = rx->local->hw.wiphy->bands[status->band];
2959                 if (!(status->flag & RX_FLAG_HT) &&
2960                     !(status->flag & RX_FLAG_VHT))
2961                         rate = &sband->bitrates[status->rate_idx];
2962
2963                 ieee80211_rx_cooked_monitor(rx, rate);
2964                 break;
2965                 }
2966         case RX_DROP_UNUSABLE:
2967                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2968                 if (rx->sta)
2969                         rx->sta->rx_dropped++;
2970                 dev_kfree_skb(rx->skb);
2971                 break;
2972         case RX_QUEUED:
2973                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2974                 break;
2975         }
2976 }
2977
2978 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2979                                   struct sk_buff_head *frames)
2980 {
2981         ieee80211_rx_result res = RX_DROP_MONITOR;
2982         struct sk_buff *skb;
2983
2984 #define CALL_RXH(rxh)                   \
2985         do {                            \
2986                 res = rxh(rx);          \
2987                 if (res != RX_CONTINUE) \
2988                         goto rxh_next;  \
2989         } while (0);
2990
2991         spin_lock_bh(&rx->local->rx_path_lock);
2992
2993         while ((skb = __skb_dequeue(frames))) {
2994                 /*
2995                  * all the other fields are valid across frames
2996                  * that belong to an aMPDU since they are on the
2997                  * same TID from the same station
2998                  */
2999                 rx->skb = skb;
3000
3001                 CALL_RXH(ieee80211_rx_h_check_more_data)
3002                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
3003                 CALL_RXH(ieee80211_rx_h_sta_process)
3004                 CALL_RXH(ieee80211_rx_h_decrypt)
3005                 CALL_RXH(ieee80211_rx_h_defragment)
3006                 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
3007                 /* must be after MMIC verify so header is counted in MPDU mic */
3008 #ifdef CONFIG_MAC80211_MESH
3009                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3010                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3011 #endif
3012                 CALL_RXH(ieee80211_rx_h_amsdu)
3013                 CALL_RXH(ieee80211_rx_h_data)
3014
3015                 /* special treatment -- needs the queue */
3016                 res = ieee80211_rx_h_ctrl(rx, frames);
3017                 if (res != RX_CONTINUE)
3018                         goto rxh_next;
3019
3020                 CALL_RXH(ieee80211_rx_h_mgmt_check)
3021                 CALL_RXH(ieee80211_rx_h_action)
3022                 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
3023                 CALL_RXH(ieee80211_rx_h_action_return)
3024                 CALL_RXH(ieee80211_rx_h_mgmt)
3025
3026  rxh_next:
3027                 ieee80211_rx_handlers_result(rx, res);
3028
3029 #undef CALL_RXH
3030         }
3031
3032         spin_unlock_bh(&rx->local->rx_path_lock);
3033 }
3034
3035 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3036 {
3037         struct sk_buff_head reorder_release;
3038         ieee80211_rx_result res = RX_DROP_MONITOR;
3039
3040         __skb_queue_head_init(&reorder_release);
3041
3042 #define CALL_RXH(rxh)                   \
3043         do {                            \
3044                 res = rxh(rx);          \
3045                 if (res != RX_CONTINUE) \
3046                         goto rxh_next;  \
3047         } while (0);
3048
3049         CALL_RXH(ieee80211_rx_h_check)
3050
3051         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3052
3053         ieee80211_rx_handlers(rx, &reorder_release);
3054         return;
3055
3056  rxh_next:
3057         ieee80211_rx_handlers_result(rx, res);
3058
3059 #undef CALL_RXH
3060 }
3061
3062 /*
3063  * This function makes calls into the RX path, therefore
3064  * it has to be invoked under RCU read lock.
3065  */
3066 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3067 {
3068         struct sk_buff_head frames;
3069         struct ieee80211_rx_data rx = {
3070                 .sta = sta,
3071                 .sdata = sta->sdata,
3072                 .local = sta->local,
3073                 /* This is OK -- must be QoS data frame */
3074                 .security_idx = tid,
3075                 .seqno_idx = tid,
3076                 .flags = 0,
3077         };
3078         struct tid_ampdu_rx *tid_agg_rx;
3079
3080         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3081         if (!tid_agg_rx)
3082                 return;
3083
3084         __skb_queue_head_init(&frames);
3085
3086         spin_lock(&tid_agg_rx->reorder_lock);
3087         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3088         spin_unlock(&tid_agg_rx->reorder_lock);
3089
3090         ieee80211_rx_handlers(&rx, &frames);
3091 }
3092
3093 /* main receive path */
3094
3095 static bool prepare_for_handlers(struct ieee80211_rx_data *rx,
3096                                  struct ieee80211_hdr *hdr)
3097 {
3098         struct ieee80211_sub_if_data *sdata = rx->sdata;
3099         struct sk_buff *skb = rx->skb;
3100         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3101         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3102         int multicast = is_multicast_ether_addr(hdr->addr1);
3103
3104         switch (sdata->vif.type) {
3105         case NL80211_IFTYPE_STATION:
3106                 if (!bssid && !sdata->u.mgd.use_4addr)
3107                         return false;
3108                 if (!multicast &&
3109                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3110                         if (!(sdata->dev->flags & IFF_PROMISC) ||
3111                             sdata->u.mgd.use_4addr)
3112                                 return false;
3113                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3114                 }
3115                 break;
3116         case NL80211_IFTYPE_ADHOC:
3117                 if (!bssid)
3118                         return false;
3119                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3120                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3121                         return false;
3122                 if (ieee80211_is_beacon(hdr->frame_control)) {
3123                         return true;
3124                 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3125                         return false;
3126                 } else if (!multicast &&
3127                            !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3128                         if (!(sdata->dev->flags & IFF_PROMISC))
3129                                 return false;
3130                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3131                 } else if (!rx->sta) {
3132                         int rate_idx;
3133                         if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3134                                 rate_idx = 0; /* TODO: HT/VHT rates */
3135                         else
3136                                 rate_idx = status->rate_idx;
3137                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3138                                                  BIT(rate_idx));
3139                 }
3140                 break;
3141         case NL80211_IFTYPE_OCB:
3142                 if (!bssid)
3143                         return false;
3144                 if (ieee80211_is_beacon(hdr->frame_control)) {
3145                         return false;
3146                 } else if (!is_broadcast_ether_addr(bssid)) {
3147                         ocb_dbg(sdata, "BSSID mismatch in OCB mode!\n");
3148                         return false;
3149                 } else if (!multicast &&
3150                            !ether_addr_equal(sdata->dev->dev_addr,
3151                                              hdr->addr1)) {
3152                         /* if we are in promisc mode we also accept
3153                          * packets not destined for us
3154                          */
3155                         if (!(sdata->dev->flags & IFF_PROMISC))
3156                                 return false;
3157                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
3158                 } else if (!rx->sta) {
3159                         int rate_idx;
3160                         if (status->flag & RX_FLAG_HT)
3161                                 rate_idx = 0; /* TODO: HT rates */
3162                         else
3163                                 rate_idx = status->rate_idx;
3164                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3165                                                 BIT(rate_idx));
3166                 }
3167                 break;
3168         case NL80211_IFTYPE_MESH_POINT:
3169                 if (!multicast &&
3170                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3171                         if (!(sdata->dev->flags & IFF_PROMISC))
3172                                 return false;
3173
3174                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3175                 }
3176                 break;
3177         case NL80211_IFTYPE_AP_VLAN:
3178         case NL80211_IFTYPE_AP:
3179                 if (!bssid) {
3180                         if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3181                                 return false;
3182                 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3183                         /*
3184                          * Accept public action frames even when the
3185                          * BSSID doesn't match, this is used for P2P
3186                          * and location updates. Note that mac80211
3187                          * itself never looks at these frames.
3188                          */
3189                         if (!multicast &&
3190                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3191                                 return false;
3192                         if (ieee80211_is_public_action(hdr, skb->len))
3193                                 return true;
3194                         if (!ieee80211_is_beacon(hdr->frame_control))
3195                                 return false;
3196                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3197                 } else if (!ieee80211_has_tods(hdr->frame_control)) {
3198                         /* ignore data frames to TDLS-peers */
3199                         if (ieee80211_is_data(hdr->frame_control))
3200                                 return false;
3201                         /* ignore action frames to TDLS-peers */
3202                         if (ieee80211_is_action(hdr->frame_control) &&
3203                             !ether_addr_equal(bssid, hdr->addr1))
3204                                 return false;
3205                 }
3206                 break;
3207         case NL80211_IFTYPE_WDS:
3208                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3209                         return false;
3210                 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3211                         return false;
3212                 break;
3213         case NL80211_IFTYPE_P2P_DEVICE:
3214                 if (!ieee80211_is_public_action(hdr, skb->len) &&
3215                     !ieee80211_is_probe_req(hdr->frame_control) &&
3216                     !ieee80211_is_probe_resp(hdr->frame_control) &&
3217                     !ieee80211_is_beacon(hdr->frame_control))
3218                         return false;
3219                 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3220                     !multicast)
3221                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3222                 break;
3223         default:
3224                 /* should never get here */
3225                 WARN_ON_ONCE(1);
3226                 break;
3227         }
3228
3229         return true;
3230 }
3231
3232 /*
3233  * This function returns whether or not the SKB
3234  * was destined for RX processing or not, which,
3235  * if consume is true, is equivalent to whether
3236  * or not the skb was consumed.
3237  */
3238 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3239                                             struct sk_buff *skb, bool consume)
3240 {
3241         struct ieee80211_local *local = rx->local;
3242         struct ieee80211_sub_if_data *sdata = rx->sdata;
3243         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3244         struct ieee80211_hdr *hdr = (void *)skb->data;
3245
3246         rx->skb = skb;
3247         status->rx_flags |= IEEE80211_RX_RA_MATCH;
3248
3249         if (!prepare_for_handlers(rx, hdr))
3250                 return false;
3251
3252         if (!consume) {
3253                 skb = skb_copy(skb, GFP_ATOMIC);
3254                 if (!skb) {
3255                         if (net_ratelimit())
3256                                 wiphy_debug(local->hw.wiphy,
3257                                         "failed to copy skb for %s\n",
3258                                         sdata->name);
3259                         return true;
3260                 }
3261
3262                 rx->skb = skb;
3263         }
3264
3265         ieee80211_invoke_rx_handlers(rx);
3266         return true;
3267 }
3268
3269 /*
3270  * This is the actual Rx frames handler. as it belongs to Rx path it must
3271  * be called with rcu_read_lock protection.
3272  */
3273 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3274                                          struct sk_buff *skb)
3275 {
3276         struct ieee80211_local *local = hw_to_local(hw);
3277         struct ieee80211_sub_if_data *sdata;
3278         struct ieee80211_hdr *hdr;
3279         __le16 fc;
3280         struct ieee80211_rx_data rx;
3281         struct ieee80211_sub_if_data *prev;
3282         struct sta_info *sta, *tmp, *prev_sta;
3283         int err = 0;
3284
3285         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3286         memset(&rx, 0, sizeof(rx));
3287         rx.skb = skb;
3288         rx.local = local;
3289
3290         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3291                 local->dot11ReceivedFragmentCount++;
3292
3293         if (ieee80211_is_mgmt(fc)) {
3294                 /* drop frame if too short for header */
3295                 if (skb->len < ieee80211_hdrlen(fc))
3296                         err = -ENOBUFS;
3297                 else
3298                         err = skb_linearize(skb);
3299         } else {
3300                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3301         }
3302
3303         if (err) {
3304                 dev_kfree_skb(skb);
3305                 return;
3306         }
3307
3308         hdr = (struct ieee80211_hdr *)skb->data;
3309         ieee80211_parse_qos(&rx);
3310         ieee80211_verify_alignment(&rx);
3311
3312         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3313                      ieee80211_is_beacon(hdr->frame_control)))
3314                 ieee80211_scan_rx(local, skb);
3315
3316         if (ieee80211_is_data(fc)) {
3317                 prev_sta = NULL;
3318
3319                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
3320                         if (!prev_sta) {
3321                                 prev_sta = sta;
3322                                 continue;
3323                         }
3324
3325                         rx.sta = prev_sta;
3326                         rx.sdata = prev_sta->sdata;
3327                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
3328
3329                         prev_sta = sta;
3330                 }
3331
3332                 if (prev_sta) {
3333                         rx.sta = prev_sta;
3334                         rx.sdata = prev_sta->sdata;
3335
3336                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3337                                 return;
3338                         goto out;
3339                 }
3340         }
3341
3342         prev = NULL;
3343
3344         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3345                 if (!ieee80211_sdata_running(sdata))
3346                         continue;
3347
3348                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3349                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3350                         continue;
3351
3352                 /*
3353                  * frame is destined for this interface, but if it's
3354                  * not also for the previous one we handle that after
3355                  * the loop to avoid copying the SKB once too much
3356                  */
3357
3358                 if (!prev) {
3359                         prev = sdata;
3360                         continue;
3361                 }
3362
3363                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3364                 rx.sdata = prev;
3365                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3366
3367                 prev = sdata;
3368         }
3369
3370         if (prev) {
3371                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3372                 rx.sdata = prev;
3373
3374                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3375                         return;
3376         }
3377
3378  out:
3379         dev_kfree_skb(skb);
3380 }
3381
3382 /*
3383  * This is the receive path handler. It is called by a low level driver when an
3384  * 802.11 MPDU is received from the hardware.
3385  */
3386 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3387 {
3388         struct ieee80211_local *local = hw_to_local(hw);
3389         struct ieee80211_rate *rate = NULL;
3390         struct ieee80211_supported_band *sband;
3391         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3392
3393         WARN_ON_ONCE(softirq_count() == 0);
3394
3395         if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3396                 goto drop;
3397
3398         sband = local->hw.wiphy->bands[status->band];
3399         if (WARN_ON(!sband))
3400                 goto drop;
3401
3402         /*
3403          * If we're suspending, it is possible although not too likely
3404          * that we'd be receiving frames after having already partially
3405          * quiesced the stack. We can't process such frames then since
3406          * that might, for example, cause stations to be added or other
3407          * driver callbacks be invoked.
3408          */
3409         if (unlikely(local->quiescing || local->suspended))
3410                 goto drop;
3411
3412         /* We might be during a HW reconfig, prevent Rx for the same reason */
3413         if (unlikely(local->in_reconfig))
3414                 goto drop;
3415
3416         /*
3417          * The same happens when we're not even started,
3418          * but that's worth a warning.
3419          */
3420         if (WARN_ON(!local->started))
3421                 goto drop;
3422
3423         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3424                 /*
3425                  * Validate the rate, unless a PLCP error means that
3426                  * we probably can't have a valid rate here anyway.
3427                  */
3428
3429                 if (status->flag & RX_FLAG_HT) {
3430                         /*
3431                          * rate_idx is MCS index, which can be [0-76]
3432                          * as documented on:
3433                          *
3434                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3435                          *
3436                          * Anything else would be some sort of driver or
3437                          * hardware error. The driver should catch hardware
3438                          * errors.
3439                          */
3440                         if (WARN(status->rate_idx > 76,
3441                                  "Rate marked as an HT rate but passed "
3442                                  "status->rate_idx is not "
3443                                  "an MCS index [0-76]: %d (0x%02x)\n",
3444                                  status->rate_idx,
3445                                  status->rate_idx))
3446                                 goto drop;
3447                 } else if (status->flag & RX_FLAG_VHT) {
3448                         if (WARN_ONCE(status->rate_idx > 9 ||
3449                                       !status->vht_nss ||
3450                                       status->vht_nss > 8,
3451                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3452                                       status->rate_idx, status->vht_nss))
3453                                 goto drop;
3454                 } else {
3455                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3456                                 goto drop;
3457                         rate = &sband->bitrates[status->rate_idx];
3458                 }
3459         }
3460
3461         status->rx_flags = 0;
3462
3463         /*
3464          * key references and virtual interfaces are protected using RCU
3465          * and this requires that we are in a read-side RCU section during
3466          * receive processing
3467          */
3468         rcu_read_lock();
3469
3470         /*
3471          * Frames with failed FCS/PLCP checksum are not returned,
3472          * all other frames are returned without radiotap header
3473          * if it was previously present.
3474          * Also, frames with less than 16 bytes are dropped.
3475          */
3476         skb = ieee80211_rx_monitor(local, skb, rate);
3477         if (!skb) {
3478                 rcu_read_unlock();
3479                 return;
3480         }
3481
3482         ieee80211_tpt_led_trig_rx(local,
3483                         ((struct ieee80211_hdr *)skb->data)->frame_control,
3484                         skb->len);
3485         __ieee80211_rx_handle_packet(hw, skb);
3486
3487         rcu_read_unlock();
3488
3489         return;
3490  drop:
3491         kfree_skb(skb);
3492 }
3493 EXPORT_SYMBOL(ieee80211_rx);
3494
3495 /* This is a version of the rx handler that can be called from hard irq
3496  * context. Post the skb on the queue and schedule the tasklet */
3497 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3498 {
3499         struct ieee80211_local *local = hw_to_local(hw);
3500
3501         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3502
3503         skb->pkt_type = IEEE80211_RX_MSG;
3504         skb_queue_tail(&local->skb_queue, skb);
3505         tasklet_schedule(&local->tasklet);
3506 }
3507 EXPORT_SYMBOL(ieee80211_rx_irqsafe);