kernel/net/mac80211/rx.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2007-2010  Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/jiffies.h>
  14 #include <linux/slab.h>
  15 #include <linux/kernel.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rcupdate.h>
  20 #include <linux/export.h>
  21 #include <net/mac80211.h>
  22 #include <net/ieee80211_radiotap.h>
  23 #include <asm/unaligned.h>
  24
  25 #include "ieee80211_i.h"
  26 #include "driver-ops.h"
  27 #include "led.h"
  28 #include "mesh.h"
  29 #include "wep.h"
  30 #include "wpa.h"
  31 #include "tkip.h"
  32 #include "wme.h"
  33 #include "rate.h"
  34
  35 static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
  36 {
  37         struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
  38
  39         u64_stats_update_begin(&tstats->syncp);
  40         tstats->rx_packets++;
  41         tstats->rx_bytes += len;
  42         u64_stats_update_end(&tstats->syncp);
  43 }
  44
  45 static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  46                                enum nl80211_iftype type)
  47 {
  48         __le16 fc = hdr->frame_control;
  49
  50         if (ieee80211_is_data(fc)) {
  51                 if (len < 24) /* drop incorrect hdr len (data) */
  52                         return NULL;
  53
  54                 if (ieee80211_has_a4(fc))
  55                         return NULL;
  56                 if (ieee80211_has_tods(fc))
  57                         return hdr->addr1;
  58                 if (ieee80211_has_fromds(fc))
  59                         return hdr->addr2;
  60
  61                 return hdr->addr3;
  62         }
  63
  64         if (ieee80211_is_mgmt(fc)) {
  65                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  66                         return NULL;
  67                 return hdr->addr3;
  68         }
  69
  70         if (ieee80211_is_ctl(fc)) {
  71                 if (ieee80211_is_pspoll(fc))
  72                         return hdr->addr1;
  73
  74                 if (ieee80211_is_back_req(fc)) {
  75                         switch (type) {
  76                         case NL80211_IFTYPE_STATION:
  77                                 return hdr->addr2;
  78                         case NL80211_IFTYPE_AP:
  79                         case NL80211_IFTYPE_AP_VLAN:
  80                                 return hdr->addr1;
  81                         default:
  82                                 break; /* fall through to the return */
  83                         }
  84                 }
  85         }
  86
  87         return NULL;
  88 }
  89
  90 /*
  91  * monitor mode reception
  92  *
  93  * This function cleans up the SKB, i.e. it removes all the stuff
  94  * only useful for monitoring.
  95  */
  96 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
  97                                            struct sk_buff *skb,
  98                                            unsigned int rtap_vendor_space)
  99 {
 100         if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
 101                 if (likely(skb->len > FCS_LEN))
 102                         __pskb_trim(skb, skb->len - FCS_LEN);
 103                 else {
 104                         /* driver bug */
 105                         WARN_ON(1);
 106                         dev_kfree_skb(skb);
 107                         return NULL;
 108                 }
 109         }
 110
 111         __pskb_pull(skb, rtap_vendor_space);
 112
 113         return skb;
 114 }
 115
 116 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
 117                                      unsigned int rtap_vendor_space)
 118 {
 119         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 120         struct ieee80211_hdr *hdr;
 121
 122         hdr = (void *)(skb->data + rtap_vendor_space);
 123
 124         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
 125                             RX_FLAG_FAILED_PLCP_CRC))
 126                 return true;
 127
 128         if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
 129                 return true;
 130
 131         if (ieee80211_is_ctl(hdr->frame_control) &&
 132             !ieee80211_is_pspoll(hdr->frame_control) &&
 133             !ieee80211_is_back_req(hdr->frame_control))
 134                 return true;
 135
 136         return false;
 137 }
 138
 139 static int
 140 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
 141                              struct ieee80211_rx_status *status,
 142                              struct sk_buff *skb)
 143 {
 144         int len;
 145
 146         /* always present fields */
 147         len = sizeof(struct ieee80211_radiotap_header) + 8;
 148
 149         /* allocate extra bitmaps */
 150         if (status->chains)
 151                 len += 4 * hweight8(status->chains);
 152
 153         if (ieee80211_have_rx_timestamp(status)) {
 154                 len = ALIGN(len, 8);
 155                 len += 8;
 156         }
 157         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
 158                 len += 1;
 159
 160         /* antenna field, if we don't have per-chain info */
 161         if (!status->chains)
 162                 len += 1;
 163
 164         /* padding for RX_FLAGS if necessary */
 165         len = ALIGN(len, 2);
 166
 167         if (status->flag & RX_FLAG_HT) /* HT info */
 168                 len += 3;
 169
 170         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 171                 len = ALIGN(len, 4);
 172                 len += 8;
 173         }
 174
 175         if (status->flag & RX_FLAG_VHT) {
 176                 len = ALIGN(len, 2);
 177                 len += 12;
 178         }
 179
 180         if (status->chains) {
 181                 /* antenna and antenna signal fields */
 182                 len += 2 * hweight8(status->chains);
 183         }
 184
 185         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 186                 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
 187
 188                 /* vendor presence bitmap */
 189                 len += 4;
 190                 /* alignment for fixed 6-byte vendor data header */
 191                 len = ALIGN(len, 2);
 192                 /* vendor data header */
 193                 len += 6;
 194                 if (WARN_ON(rtap->align == 0))
 195                         rtap->align = 1;
 196                 len = ALIGN(len, rtap->align);
 197                 len += rtap->len + rtap->pad;
 198         }
 199
 200         return len;
 201 }
 202
 203 /*
 204  * ieee80211_add_rx_radiotap_header - add radiotap header
 205  *
 206  * add a radiotap header containing all the fields which the hardware provided.
 207  */
 208 static void
 209 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 210                                  struct sk_buff *skb,
 211                                  struct ieee80211_rate *rate,
 212                                  int rtap_len, bool has_fcs)
 213 {
 214         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 215         struct ieee80211_radiotap_header *rthdr;
 216         unsigned char *pos;
 217         __le32 *it_present;
 218         u32 it_present_val;
 219         u16 rx_flags = 0;
 220         u16 channel_flags = 0;
 221         int mpdulen, chain;
 222         unsigned long chains = status->chains;
 223         struct ieee80211_vendor_radiotap rtap = {};
 224
 225         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 226                 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
 227                 /* rtap.len and rtap.pad are undone immediately */
 228                 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
 229         }
 230
 231         mpdulen = skb->len;
 232         if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
 233                 mpdulen += FCS_LEN;
 234
 235         rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
 236         memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
 237         it_present = &rthdr->it_present;
 238
 239         /* radiotap header, set always present flags */
 240         rthdr->it_len = cpu_to_le16(rtap_len);
 241         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
 242                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
 243                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
 244
 245         if (!status->chains)
 246                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
 247
 248         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 249                 it_present_val |=
 250                         BIT(IEEE80211_RADIOTAP_EXT) |
 251                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
 252                 put_unaligned_le32(it_present_val, it_present);
 253                 it_present++;
 254                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
 255                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 256         }
 257
 258         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 259                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
 260                                   BIT(IEEE80211_RADIOTAP_EXT);
 261                 put_unaligned_le32(it_present_val, it_present);
 262                 it_present++;
 263                 it_present_val = rtap.present;
 264         }
 265
 266         put_unaligned_le32(it_present_val, it_present);
 267
 268         pos = (void *)(it_present + 1);
 269
 270         /* the order of the following fields is important */
 271
 272         /* IEEE80211_RADIOTAP_TSFT */
 273         if (ieee80211_have_rx_timestamp(status)) {
 274                 /* padding */
 275                 while ((pos - (u8 *)rthdr) & 7)
 276                         *pos++ = 0;
 277                 put_unaligned_le64(
 278                         ieee80211_calculate_rx_timestamp(local, status,
 279                                                          mpdulen, 0),
 280                         pos);
 281                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 282                 pos += 8;
 283         }
 284
 285         /* IEEE80211_RADIOTAP_FLAGS */
 286         if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
 287                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 288         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 289                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 290         if (status->flag & RX_FLAG_SHORTPRE)
 291                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 292         pos++;
 293
 294         /* IEEE80211_RADIOTAP_RATE */
 295         if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
 296                 /*
 297                  * Without rate information don't add it. If we have,
 298                  * MCS information is a separate field in radiotap,
 299                  * added below. The byte here is needed as padding
 300                  * for the channel though, so initialise it to 0.
 301                  */
 302                 *pos = 0;
 303         } else {
 304                 int shift = 0;
 305                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 306                 if (status->flag & RX_FLAG_10MHZ)
 307                         shift = 1;
 308                 else if (status->flag & RX_FLAG_5MHZ)
 309                         shift = 2;
 310                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
 311         }
 312         pos++;
 313
 314         /* IEEE80211_RADIOTAP_CHANNEL */
 315         put_unaligned_le16(status->freq, pos);
 316         pos += 2;
 317         if (status->flag & RX_FLAG_10MHZ)
 318                 channel_flags |= IEEE80211_CHAN_HALF;
 319         else if (status->flag & RX_FLAG_5MHZ)
 320                 channel_flags |= IEEE80211_CHAN_QUARTER;
 321
 322         if (status->band == IEEE80211_BAND_5GHZ)
 323                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 324         else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
 325                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 326         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 327                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 328         else if (rate)
 329                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
 330         else
 331                 channel_flags |= IEEE80211_CHAN_2GHZ;
 332         put_unaligned_le16(channel_flags, pos);
 333         pos += 2;
 334
 335         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 336         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
 337             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 338                 *pos = status->signal;
 339                 rthdr->it_present |=
 340                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 341                 pos++;
 342         }
 343
 344         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 345
 346         if (!status->chains) {
 347                 /* IEEE80211_RADIOTAP_ANTENNA */
 348                 *pos = status->antenna;
 349                 pos++;
 350         }
 351
 352         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 353
 354         /* IEEE80211_RADIOTAP_RX_FLAGS */
 355         /* ensure 2 byte alignment for the 2 byte field as required */
 356         if ((pos - (u8 *)rthdr) & 1)
 357                 *pos++ = 0;
 358         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 359                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 360         put_unaligned_le16(rx_flags, pos);
 361         pos += 2;
 362
 363         if (status->flag & RX_FLAG_HT) {
 364                 unsigned int stbc;
 365
 366                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 367                 *pos++ = local->hw.radiotap_mcs_details;
 368                 *pos = 0;
 369                 if (status->flag & RX_FLAG_SHORT_GI)
 370                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 371                 if (status->flag & RX_FLAG_40MHZ)
 372                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 373                 if (status->flag & RX_FLAG_HT_GF)
 374                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 375                 if (status->flag & RX_FLAG_LDPC)
 376                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
 377                 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
 378                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 379                 pos++;
 380                 *pos++ = status->rate_idx;
 381         }
 382
 383         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 384                 u16 flags = 0;
 385
 386                 /* ensure 4 byte alignment */
 387                 while ((pos - (u8 *)rthdr) & 3)
 388                         pos++;
 389                 rthdr->it_present |=
 390                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 391                 put_unaligned_le32(status->ampdu_reference, pos);
 392                 pos += 4;
 393                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 394                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 395                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 396                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 397                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 398                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 399                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 400                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 401                 put_unaligned_le16(flags, pos);
 402                 pos += 2;
 403                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 404                         *pos++ = status->ampdu_delimiter_crc;
 405                 else
 406                         *pos++ = 0;
 407                 *pos++ = 0;
 408         }
 409
 410         if (status->flag & RX_FLAG_VHT) {
 411                 u16 known = local->hw.radiotap_vht_details;
 412
 413                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 414                 put_unaligned_le16(known, pos);
 415                 pos += 2;
 416                 /* flags */
 417                 if (status->flag & RX_FLAG_SHORT_GI)
 418                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 419                 /* in VHT, STBC is binary */
 420                 if (status->flag & RX_FLAG_STBC_MASK)
 421                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
 422                 if (status->vht_flag & RX_VHT_FLAG_BF)
 423                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
 424                 pos++;
 425                 /* bandwidth */
 426                 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
 427                         *pos++ = 4;
 428                 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
 429                         *pos++ = 11;
 430                 else if (status->flag & RX_FLAG_40MHZ)
 431                         *pos++ = 1;
 432                 else /* 20 MHz */
 433                         *pos++ = 0;
 434                 /* MCS/NSS */
 435                 *pos = (status->rate_idx << 4) | status->vht_nss;
 436                 pos += 4;
 437                 /* coding field */
 438                 if (status->flag & RX_FLAG_LDPC)
 439                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
 440                 pos++;
 441                 /* group ID */
 442                 pos++;
 443                 /* partial_aid */
 444                 pos += 2;
 445         }
 446
 447         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 448                 *pos++ = status->chain_signal[chain];
 449                 *pos++ = chain;
 450         }
 451
 452         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 453                 /* ensure 2 byte alignment for the vendor field as required */
 454                 if ((pos - (u8 *)rthdr) & 1)
 455                         *pos++ = 0;
 456                 *pos++ = rtap.oui[0];
 457                 *pos++ = rtap.oui[1];
 458                 *pos++ = rtap.oui[2];
 459                 *pos++ = rtap.subns;
 460                 put_unaligned_le16(rtap.len, pos);
 461                 pos += 2;
 462                 /* align the actual payload as requested */
 463                 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
 464                         *pos++ = 0;
 465                 /* data (and possible padding) already follows */
 466         }
 467 }
 468
 469 /*
 470  * This function copies a received frame to all monitor interfaces and
 471  * returns a cleaned-up SKB that no longer includes the FCS nor the
 472  * radiotap header the driver might have added.
 473  */
 474 static struct sk_buff *
 475 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 476                      struct ieee80211_rate *rate)
 477 {
 478         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 479         struct ieee80211_sub_if_data *sdata;
 480         int rt_hdrlen, needed_headroom;
 481         struct sk_buff *skb, *skb2;
 482         struct net_device *prev_dev = NULL;
 483         int present_fcs_len = 0;
 484         unsigned int rtap_vendor_space = 0;
 485
 486         if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
 487                 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
 488
 489                 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
 490         }
 491
 492         /*
 493          * First, we may need to make a copy of the skb because
 494          *  (1) we need to modify it for radiotap (if not present), and
 495          *  (2) the other RX handlers will modify the skb we got.
 496          *
 497          * We don't need to, of course, if we aren't going to return
 498          * the SKB because it has a bad FCS/PLCP checksum.
 499          */
 500
 501         if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
 502                 present_fcs_len = FCS_LEN;
 503
 504         /* ensure hdr->frame_control and vendor radiotap data are in skb head */
 505         if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
 506                 dev_kfree_skb(origskb);
 507                 return NULL;
 508         }
 509
 510         if (!local->monitors) {
 511                 if (should_drop_frame(origskb, present_fcs_len,
 512                                       rtap_vendor_space)) {
 513                         dev_kfree_skb(origskb);
 514                         return NULL;
 515                 }
 516
 517                 return remove_monitor_info(local, origskb, rtap_vendor_space);
 518         }
 519
 520         /* room for the radiotap header based on driver features */
 521         rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
 522         needed_headroom = rt_hdrlen - rtap_vendor_space;
 523
 524         if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) {
 525                 /* only need to expand headroom if necessary */
 526                 skb = origskb;
 527                 origskb = NULL;
 528
 529                 /*
 530                  * This shouldn't trigger often because most devices have an
 531                  * RX header they pull before we get here, and that should
 532                  * be big enough for our radiotap information. We should
 533                  * probably export the length to drivers so that we can have
 534                  * them allocate enough headroom to start with.
 535                  */
 536                 if (skb_headroom(skb) < needed_headroom &&
 537                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 538                         dev_kfree_skb(skb);
 539                         return NULL;
 540                 }
 541         } else {
 542                 /*
 543                  * Need to make a copy and possibly remove radiotap header
 544                  * and FCS from the original.
 545                  */
 546                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
 547
 548                 origskb = remove_monitor_info(local, origskb,
 549                                               rtap_vendor_space);
 550
 551                 if (!skb)
 552                         return origskb;
 553         }
 554
 555         /* prepend radiotap information */
 556         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
 557
 558         skb_reset_mac_header(skb);
 559         skb->ip_summed = CHECKSUM_UNNECESSARY;
 560         skb->pkt_type = PACKET_OTHERHOST;
 561         skb->protocol = htons(ETH_P_802_2);
 562
 563         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 564                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
 565                         continue;
 566
 567                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
 568                         continue;
 569
 570                 if (!ieee80211_sdata_running(sdata))
 571                         continue;
 572
 573                 if (prev_dev) {
 574                         skb2 = skb_clone(skb, GFP_ATOMIC);
 575                         if (skb2) {
 576                                 skb2->dev = prev_dev;
 577                                 netif_receive_skb(skb2);
 578                         }
 579                 }
 580
 581                 prev_dev = sdata->dev;
 582                 ieee80211_rx_stats(sdata->dev, skb->len);
 583         }
 584
 585         if (prev_dev) {
 586                 skb->dev = prev_dev;
 587                 netif_receive_skb(skb);
 588         } else
 589                 dev_kfree_skb(skb);
 590
 591         return origskb;
 592 }
 593
 594 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 595 {
 596         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 597         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 598         int tid, seqno_idx, security_idx;
 599
 600         /* does the frame have a qos control field? */
 601         if (ieee80211_is_data_qos(hdr->frame_control)) {
 602                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 603                 /* frame has qos control */
 604                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 605                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 606                         status->rx_flags |= IEEE80211_RX_AMSDU;
 607
 608                 seqno_idx = tid;
 609                 security_idx = tid;
 610         } else {
 611                 /*
 612                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 613                  *
 614                  *      Sequence numbers for management frames, QoS data
 615                  *      frames with a broadcast/multicast address in the
 616                  *      Address 1 field, and all non-QoS data frames sent
 617                  *      by QoS STAs are assigned using an additional single
 618                  *      modulo-4096 counter, [...]
 619                  *
 620                  * We also use that counter for non-QoS STAs.
 621                  */
 622                 seqno_idx = IEEE80211_NUM_TIDS;
 623                 security_idx = 0;
 624                 if (ieee80211_is_mgmt(hdr->frame_control))
 625                         security_idx = IEEE80211_NUM_TIDS;
 626                 tid = 0;
 627         }
 628
 629         rx->seqno_idx = seqno_idx;
 630         rx->security_idx = security_idx;
 631         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 632          * For now, set skb->priority to 0 for other cases. */
 633         rx->skb->priority = (tid > 7) ? 0 : tid;
 634 }
 635
 636 /**
 637  * DOC: Packet alignment
 638  *
 639  * Drivers always need to pass packets that are aligned to two-byte boundaries
 640  * to the stack.
 641  *
 642  * Additionally, should, if possible, align the payload data in a way that
 643  * guarantees that the contained IP header is aligned to a four-byte
 644  * boundary. In the case of regular frames, this simply means aligning the
 645  * payload to a four-byte boundary (because either the IP header is directly
 646  * contained, or IV/RFC1042 headers that have a length divisible by four are
 647  * in front of it).  If the payload data is not properly aligned and the
 648  * architecture doesn't support efficient unaligned operations, mac80211
 649  * will align the data.
 650  *
 651  * With A-MSDU frames, however, the payload data address must yield two modulo
 652  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 653  * push the IP header further back to a multiple of four again. Thankfully, the
 654  * specs were sane enough this time around to require padding each A-MSDU
 655  * subframe to a length that is a multiple of four.
 656  *
 657  * Padding like Atheros hardware adds which is between the 802.11 header and
 658  * the payload is not supported, the driver is required to move the 802.11
 659  * header to be directly in front of the payload in that case.
 660  */
 661 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 662 {
 663 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 664         WARN_ONCE((unsigned long)rx->skb->data & 1,
 665                   "unaligned packet at 0x%p\n", rx->skb->data);
 666 #endif
 667 }
 668
 669
 670 /* rx handlers */
 671
 672 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 673 {
 674         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 675
 676         if (is_multicast_ether_addr(hdr->addr1))
 677                 return 0;
 678
 679         return ieee80211_is_robust_mgmt_frame(skb);
 680 }
 681
 682
 683 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 684 {
 685         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 686
 687         if (!is_multicast_ether_addr(hdr->addr1))
 688                 return 0;
 689
 690         return ieee80211_is_robust_mgmt_frame(skb);
 691 }
 692
 693
 694 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 695 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 696 {
 697         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 698         struct ieee80211_mmie *mmie;
 699         struct ieee80211_mmie_16 *mmie16;
 700
 701         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 702                 return -1;
 703
 704         if (!ieee80211_is_robust_mgmt_frame(skb))
 705                 return -1; /* not a robust management frame */
 706
 707         mmie = (struct ieee80211_mmie *)
 708                 (skb->data + skb->len - sizeof(*mmie));
 709         if (mmie->element_id == WLAN_EID_MMIE &&
 710             mmie->length == sizeof(*mmie) - 2)
 711                 return le16_to_cpu(mmie->key_id);
 712
 713         mmie16 = (struct ieee80211_mmie_16 *)
 714                 (skb->data + skb->len - sizeof(*mmie16));
 715         if (skb->len >= 24 + sizeof(*mmie16) &&
 716             mmie16->element_id == WLAN_EID_MMIE &&
 717             mmie16->length == sizeof(*mmie16) - 2)
 718                 return le16_to_cpu(mmie16->key_id);
 719
 720         return -1;
 721 }
 722
 723 static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
 724                                  struct sk_buff *skb)
 725 {
 726         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 727         __le16 fc;
 728         int hdrlen;
 729         u8 keyid;
 730
 731         fc = hdr->frame_control;
 732         hdrlen = ieee80211_hdrlen(fc);
 733
 734         if (skb->len < hdrlen + cs->hdr_len)
 735                 return -EINVAL;
 736
 737         skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
 738         keyid &= cs->key_idx_mask;
 739         keyid >>= cs->key_idx_shift;
 740
 741         return keyid;
 742 }
 743
 744 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
 745 {
 746         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 747         char *dev_addr = rx->sdata->vif.addr;
 748
 749         if (ieee80211_is_data(hdr->frame_control)) {
 750                 if (is_multicast_ether_addr(hdr->addr1)) {
 751                         if (ieee80211_has_tods(hdr->frame_control) ||
 752                             !ieee80211_has_fromds(hdr->frame_control))
 753                                 return RX_DROP_MONITOR;
 754                         if (ether_addr_equal(hdr->addr3, dev_addr))
 755                                 return RX_DROP_MONITOR;
 756                 } else {
 757                         if (!ieee80211_has_a4(hdr->frame_control))
 758                                 return RX_DROP_MONITOR;
 759                         if (ether_addr_equal(hdr->addr4, dev_addr))
 760                                 return RX_DROP_MONITOR;
 761                 }
 762         }
 763
 764         /* If there is not an established peer link and this is not a peer link
 765          * establisment frame, beacon or probe, drop the frame.
 766          */
 767
 768         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
 769                 struct ieee80211_mgmt *mgmt;
 770
 771                 if (!ieee80211_is_mgmt(hdr->frame_control))
 772                         return RX_DROP_MONITOR;
 773
 774                 if (ieee80211_is_action(hdr->frame_control)) {
 775                         u8 category;
 776
 777                         /* make sure category field is present */
 778                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
 779                                 return RX_DROP_MONITOR;
 780
 781                         mgmt = (struct ieee80211_mgmt *)hdr;
 782                         category = mgmt->u.action.category;
 783                         if (category != WLAN_CATEGORY_MESH_ACTION &&
 784                             category != WLAN_CATEGORY_SELF_PROTECTED)
 785                                 return RX_DROP_MONITOR;
 786                         return RX_CONTINUE;
 787                 }
 788
 789                 if (ieee80211_is_probe_req(hdr->frame_control) ||
 790                     ieee80211_is_probe_resp(hdr->frame_control) ||
 791                     ieee80211_is_beacon(hdr->frame_control) ||
 792                     ieee80211_is_auth(hdr->frame_control))
 793                         return RX_CONTINUE;
 794
 795                 return RX_DROP_MONITOR;
 796         }
 797
 798         return RX_CONTINUE;
 799 }
 800
 801 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
 802                                             struct tid_ampdu_rx *tid_agg_rx,
 803                                             int index,
 804                                             struct sk_buff_head *frames)
 805 {
 806         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
 807         struct sk_buff *skb;
 808         struct ieee80211_rx_status *status;
 809
 810         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 811
 812         if (skb_queue_empty(skb_list))
 813                 goto no_frame;
 814
 815         if (!ieee80211_rx_reorder_ready(skb_list)) {
 816                 __skb_queue_purge(skb_list);
 817                 goto no_frame;
 818         }
 819
 820         /* release frames from the reorder ring buffer */
 821         tid_agg_rx->stored_mpdu_num--;
 822         while ((skb = __skb_dequeue(skb_list))) {
 823                 status = IEEE80211_SKB_RXCB(skb);
 824                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
 825                 __skb_queue_tail(frames, skb);
 826         }
 827
 828 no_frame:
 829         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 830 }
 831
 832 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
 833                                              struct tid_ampdu_rx *tid_agg_rx,
 834                                              u16 head_seq_num,
 835                                              struct sk_buff_head *frames)
 836 {
 837         int index;
 838
 839         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 840
 841         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
 842                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 843                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 844                                                 frames);
 845         }
 846 }
 847
 848 /*
 849  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
 850  * the skb was added to the buffer longer than this time ago, the earlier
 851  * frames that have not yet been received are assumed to be lost and the skb
 852  * can be released for processing. This may also release other skb's from the
 853  * reorder buffer if there are no additional gaps between the frames.
 854  *
 855  * Callers must hold tid_agg_rx->reorder_lock.
 856  */
 857 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
 858
 859 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
 860                                           struct tid_ampdu_rx *tid_agg_rx,
 861                                           struct sk_buff_head *frames)
 862 {
 863         int index, i, j;
 864
 865         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 866
 867         /* release the buffer until next missing frame */
 868         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 869         if (!ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index]) &&
 870             tid_agg_rx->stored_mpdu_num) {
 871                 /*
 872                  * No buffers ready to be released, but check whether any
 873                  * frames in the reorder buffer have timed out.
 874                  */
 875                 int skipped = 1;
 876                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
 877                      j = (j + 1) % tid_agg_rx->buf_size) {
 878                         if (!ieee80211_rx_reorder_ready(
 879                                         &tid_agg_rx->reorder_buf[j])) {
 880                                 skipped++;
 881                                 continue;
 882                         }
 883                         if (skipped &&
 884                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
 885                                         HT_RX_REORDER_BUF_TIMEOUT))
 886                                 goto set_release_timer;
 887
 888                         /* don't leave incomplete A-MSDUs around */
 889                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
 890                              i = (i + 1) % tid_agg_rx->buf_size)
 891                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
 892
 893                         ht_dbg_ratelimited(sdata,
 894                                            "release an RX reorder frame due to timeout on earlier frames\n");
 895                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
 896                                                         frames);
 897
 898                         /*
 899                          * Increment the head seq# also for the skipped slots.
 900                          */
 901                         tid_agg_rx->head_seq_num =
 902                                 (tid_agg_rx->head_seq_num +
 903                                  skipped) & IEEE80211_SN_MASK;
 904                         skipped = 0;
 905                 }
 906         } else while (ieee80211_rx_reorder_ready(
 907                                 &tid_agg_rx->reorder_buf[index])) {
 908                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 909                                                 frames);
 910                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 911         }
 912
 913         if (tid_agg_rx->stored_mpdu_num) {
 914                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 915
 916                 for (; j != (index - 1) % tid_agg_rx->buf_size;
 917                      j = (j + 1) % tid_agg_rx->buf_size) {
 918                         if (ieee80211_rx_reorder_ready(
 919                                         &tid_agg_rx->reorder_buf[j]))
 920                                 break;
 921                 }
 922
 923  set_release_timer:
 924
 925                 if (!tid_agg_rx->removed)
 926                         mod_timer(&tid_agg_rx->reorder_timer,
 927                                   tid_agg_rx->reorder_time[j] + 1 +
 928                                   HT_RX_REORDER_BUF_TIMEOUT);
 929         } else {
 930                 del_timer(&tid_agg_rx->reorder_timer);
 931         }
 932 }
 933
 934 /*
 935  * As this function belongs to the RX path it must be under
 936  * rcu_read_lock protection. It returns false if the frame
 937  * can be processed immediately, true if it was consumed.
 938  */
 939 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
 940                                              struct tid_ampdu_rx *tid_agg_rx,
 941                                              struct sk_buff *skb,
 942                                              struct sk_buff_head *frames)
 943 {
 944         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 945         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 946         u16 sc = le16_to_cpu(hdr->seq_ctrl);
 947         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
 948         u16 head_seq_num, buf_size;
 949         int index;
 950         bool ret = true;
 951
 952         spin_lock(&tid_agg_rx->reorder_lock);
 953
 954         /*
 955          * Offloaded BA sessions have no known starting sequence number so pick
 956          * one from first Rxed frame for this tid after BA was started.
 957          */
 958         if (unlikely(tid_agg_rx->auto_seq)) {
 959                 tid_agg_rx->auto_seq = false;
 960                 tid_agg_rx->ssn = mpdu_seq_num;
 961                 tid_agg_rx->head_seq_num = mpdu_seq_num;
 962         }
 963
 964         buf_size = tid_agg_rx->buf_size;
 965         head_seq_num = tid_agg_rx->head_seq_num;
 966
 967         /* frame with out of date sequence number */
 968         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
 969                 dev_kfree_skb(skb);
 970                 goto out;
 971         }
 972
 973         /*
 974          * If frame the sequence number exceeds our buffering window
 975          * size release some previous frames to make room for this one.
 976          */
 977         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
 978                 head_seq_num = ieee80211_sn_inc(
 979                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
 980                 /* release stored frames up to new head to stack */
 981                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
 982                                                  head_seq_num, frames);
 983         }
 984
 985         /* Now the new frame is always in the range of the reordering buffer */
 986
 987         index = mpdu_seq_num % tid_agg_rx->buf_size;
 988
 989         /* check if we already stored this frame */
 990         if (ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index])) {
 991                 dev_kfree_skb(skb);
 992                 goto out;
 993         }
 994
 995         /*
 996          * If the current MPDU is in the right order and nothing else
 997          * is stored we can process it directly, no need to buffer it.
 998          * If it is first but there's something stored, we may be able
 999          * to release frames after this one.
1000          */
1001         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1002             tid_agg_rx->stored_mpdu_num == 0) {
1003                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1004                         tid_agg_rx->head_seq_num =
1005                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1006                 ret = false;
1007                 goto out;
1008         }
1009
1010         /* put the frame in the reordering buffer */
1011         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1012         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1013                 tid_agg_rx->reorder_time[index] = jiffies;
1014                 tid_agg_rx->stored_mpdu_num++;
1015                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1016         }
1017
1018  out:
1019         spin_unlock(&tid_agg_rx->reorder_lock);
1020         return ret;
1021 }
1022
1023 /*
1024  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1025  * true if the MPDU was buffered, false if it should be processed.
1026  */
1027 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1028                                        struct sk_buff_head *frames)
1029 {
1030         struct sk_buff *skb = rx->skb;
1031         struct ieee80211_local *local = rx->local;
1032         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1033         struct sta_info *sta = rx->sta;
1034         struct tid_ampdu_rx *tid_agg_rx;
1035         u16 sc;
1036         u8 tid, ack_policy;
1037
1038         if (!ieee80211_is_data_qos(hdr->frame_control) ||
1039             is_multicast_ether_addr(hdr->addr1))
1040                 goto dont_reorder;
1041
1042         /*
1043          * filter the QoS data rx stream according to
1044          * STA/TID and check if this STA/TID is on aggregation
1045          */
1046
1047         if (!sta)
1048                 goto dont_reorder;
1049
1050         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1051                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1052         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1053
1054         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1055         if (!tid_agg_rx)
1056                 goto dont_reorder;
1057
1058         /* qos null data frames are excluded */
1059         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1060                 goto dont_reorder;
1061
1062         /* not part of a BA session */
1063         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1064             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1065                 goto dont_reorder;
1066
1067         /* new, potentially un-ordered, ampdu frame - process it */
1068
1069         /* reset session timer */
1070         if (tid_agg_rx->timeout)
1071                 tid_agg_rx->last_rx = jiffies;
1072
1073         /* if this mpdu is fragmented - terminate rx aggregation session */
1074         sc = le16_to_cpu(hdr->seq_ctrl);
1075         if (sc & IEEE80211_SCTL_FRAG) {
1076                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
1077                 skb_queue_tail(&rx->sdata->skb_queue, skb);
1078                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1079                 return;
1080         }
1081
1082         /*
1083          * No locking needed -- we will only ever process one
1084          * RX packet at a time, and thus own tid_agg_rx. All
1085          * other code manipulating it needs to (and does) make
1086          * sure that we cannot get to it any more before doing
1087          * anything with it.
1088          */
1089         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1090                                              frames))
1091                 return;
1092
1093  dont_reorder:
1094         __skb_queue_tail(frames, skb);
1095 }
1096
1097 static ieee80211_rx_result debug_noinline
1098 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1099 {
1100         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1101         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1102
1103         /*
1104          * Drop duplicate 802.11 retransmissions
1105          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1106          */
1107
1108         if (rx->skb->len < 24)
1109                 return RX_CONTINUE;
1110
1111         if (ieee80211_is_ctl(hdr->frame_control) ||
1112             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1113             is_multicast_ether_addr(hdr->addr1))
1114                 return RX_CONTINUE;
1115
1116         if (!rx->sta)
1117                 return RX_CONTINUE;
1118
1119         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1120                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1121                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1122                 rx->sta->rx_stats.num_duplicates++;
1123                 return RX_DROP_UNUSABLE;
1124         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1125                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1126         }
1127
1128         return RX_CONTINUE;
1129 }
1130
1131 static ieee80211_rx_result debug_noinline
1132 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1133 {
1134         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1135
1136         /* Drop disallowed frame classes based on STA auth/assoc state;
1137          * IEEE 802.11, Chap 5.5.
1138          *
1139          * mac80211 filters only based on association state, i.e. it drops
1140          * Class 3 frames from not associated stations. hostapd sends
1141          * deauth/disassoc frames when needed. In addition, hostapd is
1142          * responsible for filtering on both auth and assoc states.
1143          */
1144
1145         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1146                 return ieee80211_rx_mesh_check(rx);
1147
1148         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1149                       ieee80211_is_pspoll(hdr->frame_control)) &&
1150                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1151                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1152                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1153                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1154                 /*
1155                  * accept port control frames from the AP even when it's not
1156                  * yet marked ASSOC to prevent a race where we don't set the
1157                  * assoc bit quickly enough before it sends the first frame
1158                  */
1159                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1160                     ieee80211_is_data_present(hdr->frame_control)) {
1161                         unsigned int hdrlen;
1162                         __be16 ethertype;
1163
1164                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1165
1166                         if (rx->skb->len < hdrlen + 8)
1167                                 return RX_DROP_MONITOR;
1168
1169                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1170                         if (ethertype == rx->sdata->control_port_protocol)
1171                                 return RX_CONTINUE;
1172                 }
1173
1174                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1175                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1176                                                hdr->addr2,
1177                                                GFP_ATOMIC))
1178                         return RX_DROP_UNUSABLE;
1179
1180                 return RX_DROP_MONITOR;
1181         }
1182
1183         return RX_CONTINUE;
1184 }
1185
1186
1187 static ieee80211_rx_result debug_noinline
1188 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1189 {
1190         struct ieee80211_local *local;
1191         struct ieee80211_hdr *hdr;
1192         struct sk_buff *skb;
1193
1194         local = rx->local;
1195         skb = rx->skb;
1196         hdr = (struct ieee80211_hdr *) skb->data;
1197
1198         if (!local->pspolling)
1199                 return RX_CONTINUE;
1200
1201         if (!ieee80211_has_fromds(hdr->frame_control))
1202                 /* this is not from AP */
1203                 return RX_CONTINUE;
1204
1205         if (!ieee80211_is_data(hdr->frame_control))
1206                 return RX_CONTINUE;
1207
1208         if (!ieee80211_has_moredata(hdr->frame_control)) {
1209                 /* AP has no more frames buffered for us */
1210                 local->pspolling = false;
1211                 return RX_CONTINUE;
1212         }
1213
1214         /* more data bit is set, let's request a new frame from the AP */
1215         ieee80211_send_pspoll(local, rx->sdata);
1216
1217         return RX_CONTINUE;
1218 }
1219
1220 static void sta_ps_start(struct sta_info *sta)
1221 {
1222         struct ieee80211_sub_if_data *sdata = sta->sdata;
1223         struct ieee80211_local *local = sdata->local;
1224         struct ps_data *ps;
1225         int tid;
1226
1227         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1228             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1229                 ps = &sdata->bss->ps;
1230         else
1231                 return;
1232
1233         atomic_inc(&ps->num_sta_ps);
1234         set_sta_flag(sta, WLAN_STA_PS_STA);
1235         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1236                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1237         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1238                sta->sta.addr, sta->sta.aid);
1239
1240         ieee80211_clear_fast_xmit(sta);
1241
1242         if (!sta->sta.txq[0])
1243                 return;
1244
1245         for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1246                 struct txq_info *txqi = to_txq_info(sta->sta.txq[tid]);
1247
1248                 if (!skb_queue_len(&txqi->queue))
1249                         set_bit(tid, &sta->txq_buffered_tids);
1250                 else
1251                         clear_bit(tid, &sta->txq_buffered_tids);
1252         }
1253 }
1254
1255 static void sta_ps_end(struct sta_info *sta)
1256 {
1257         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1258                sta->sta.addr, sta->sta.aid);
1259
1260         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1261                 /*
1262                  * Clear the flag only if the other one is still set
1263                  * so that the TX path won't start TX'ing new frames
1264                  * directly ... In the case that the driver flag isn't
1265                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1266                  */
1267                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1268                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1269                        sta->sta.addr, sta->sta.aid);
1270                 return;
1271         }
1272
1273         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1274         clear_sta_flag(sta, WLAN_STA_PS_STA);
1275         ieee80211_sta_ps_deliver_wakeup(sta);
1276 }
1277
1278 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1279 {
1280         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1281         bool in_ps;
1282
1283         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1284
1285         /* Don't let the same PS state be set twice */
1286         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1287         if ((start && in_ps) || (!start && !in_ps))
1288                 return -EINVAL;
1289
1290         if (start)
1291                 sta_ps_start(sta);
1292         else
1293                 sta_ps_end(sta);
1294
1295         return 0;
1296 }
1297 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1298
1299 static ieee80211_rx_result debug_noinline
1300 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1301 {
1302         struct ieee80211_sub_if_data *sdata = rx->sdata;
1303         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1304         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1305         int tid, ac;
1306
1307         if (!rx->sta)
1308                 return RX_CONTINUE;
1309
1310         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1311             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1312                 return RX_CONTINUE;
1313
1314         /*
1315          * The device handles station powersave, so don't do anything about
1316          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1317          * it to mac80211 since they're handled.)
1318          */
1319         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1320                 return RX_CONTINUE;
1321
1322         /*
1323          * Don't do anything if the station isn't already asleep. In
1324          * the uAPSD case, the station will probably be marked asleep,
1325          * in the PS-Poll case the station must be confused ...
1326          */
1327         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1328                 return RX_CONTINUE;
1329
1330         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1331                 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1332                         if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1333                                 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1334                         else
1335                                 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1336                 }
1337
1338                 /* Free PS Poll skb here instead of returning RX_DROP that would
1339                  * count as an dropped frame. */
1340                 dev_kfree_skb(rx->skb);
1341
1342                 return RX_QUEUED;
1343         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1344                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1345                    ieee80211_has_pm(hdr->frame_control) &&
1346                    (ieee80211_is_data_qos(hdr->frame_control) ||
1347                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1348                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1349                 ac = ieee802_1d_to_ac[tid & 7];
1350
1351                 /*
1352                  * If this AC is not trigger-enabled do nothing.
1353                  *
1354                  * NB: This could/should check a separate bitmap of trigger-
1355                  * enabled queues, but for now we only implement uAPSD w/o
1356                  * TSPEC changes to the ACs, so they're always the same.
1357                  */
1358                 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1359                         return RX_CONTINUE;
1360
1361                 /* if we are in a service period, do nothing */
1362                 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1363                         return RX_CONTINUE;
1364
1365                 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1366                         ieee80211_sta_ps_deliver_uapsd(rx->sta);
1367                 else
1368                         set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1369         }
1370
1371         return RX_CONTINUE;
1372 }
1373
1374 static ieee80211_rx_result debug_noinline
1375 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1376 {
1377         struct sta_info *sta = rx->sta;
1378         struct sk_buff *skb = rx->skb;
1379         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1380         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1381         int i;
1382
1383         if (!sta)
1384                 return RX_CONTINUE;
1385
1386         /*
1387          * Update last_rx only for IBSS packets which are for the current
1388          * BSSID and for station already AUTHORIZED to avoid keeping the
1389          * current IBSS network alive in cases where other STAs start
1390          * using different BSSID. This will also give the station another
1391          * chance to restart the authentication/authorization in case
1392          * something went wrong the first time.
1393          */
1394         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1395                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1396                                                 NL80211_IFTYPE_ADHOC);
1397                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1398                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1399                         sta->rx_stats.last_rx = jiffies;
1400                         if (ieee80211_is_data(hdr->frame_control) &&
1401                             !is_multicast_ether_addr(hdr->addr1)) {
1402                                 sta->rx_stats.last_rate_idx =
1403                                         status->rate_idx;
1404                                 sta->rx_stats.last_rate_flag =
1405                                         status->flag;
1406                                 sta->rx_stats.last_rate_vht_flag =
1407                                         status->vht_flag;
1408                                 sta->rx_stats.last_rate_vht_nss =
1409                                         status->vht_nss;
1410                         }
1411                 }
1412         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1413                 sta->rx_stats.last_rx = jiffies;
1414         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1415                 /*
1416                  * Mesh beacons will update last_rx when if they are found to
1417                  * match the current local configuration when processed.
1418                  */
1419                 sta->rx_stats.last_rx = jiffies;
1420                 if (ieee80211_is_data(hdr->frame_control)) {
1421                         sta->rx_stats.last_rate_idx = status->rate_idx;
1422                         sta->rx_stats.last_rate_flag = status->flag;
1423                         sta->rx_stats.last_rate_vht_flag = status->vht_flag;
1424                         sta->rx_stats.last_rate_vht_nss = status->vht_nss;
1425                 }
1426         }
1427
1428         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1429                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1430
1431         sta->rx_stats.fragments++;
1432         sta->rx_stats.bytes += rx->skb->len;
1433         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1434                 sta->rx_stats.last_signal = status->signal;
1435                 ewma_signal_add(&sta->rx_stats.avg_signal, -status->signal);
1436         }
1437
1438         if (status->chains) {
1439                 sta->rx_stats.chains = status->chains;
1440                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1441                         int signal = status->chain_signal[i];
1442
1443                         if (!(status->chains & BIT(i)))
1444                                 continue;
1445
1446                         sta->rx_stats.chain_signal_last[i] = signal;
1447                         ewma_signal_add(&sta->rx_stats.chain_signal_avg[i],
1448                                         -signal);
1449                 }
1450         }
1451
1452         /*
1453          * Change STA power saving mode only at the end of a frame
1454          * exchange sequence.
1455          */
1456         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1457             !ieee80211_has_morefrags(hdr->frame_control) &&
1458             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1459             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1460              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1461             /* PM bit is only checked in frames where it isn't reserved,
1462              * in AP mode it's reserved in non-bufferable management frames
1463              * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1464              */
1465             (!ieee80211_is_mgmt(hdr->frame_control) ||
1466              ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1467                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1468                         if (!ieee80211_has_pm(hdr->frame_control))
1469                                 sta_ps_end(sta);
1470                 } else {
1471                         if (ieee80211_has_pm(hdr->frame_control))
1472                                 sta_ps_start(sta);
1473                 }
1474         }
1475
1476         /* mesh power save support */
1477         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1478                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1479
1480         /*
1481          * Drop (qos-)data::nullfunc frames silently, since they
1482          * are used only to control station power saving mode.
1483          */
1484         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1485             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1486                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1487
1488                 /*
1489                  * If we receive a 4-addr nullfunc frame from a STA
1490                  * that was not moved to a 4-addr STA vlan yet send
1491                  * the event to userspace and for older hostapd drop
1492                  * the frame to the monitor interface.
1493                  */
1494                 if (ieee80211_has_a4(hdr->frame_control) &&
1495                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1496                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1497                       !rx->sdata->u.vlan.sta))) {
1498                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1499                                 cfg80211_rx_unexpected_4addr_frame(
1500                                         rx->sdata->dev, sta->sta.addr,
1501                                         GFP_ATOMIC);
1502                         return RX_DROP_MONITOR;
1503                 }
1504                 /*
1505                  * Update counter and free packet here to avoid
1506                  * counting this as a dropped packed.
1507                  */
1508                 sta->rx_stats.packets++;
1509                 dev_kfree_skb(rx->skb);
1510                 return RX_QUEUED;
1511         }
1512
1513         return RX_CONTINUE;
1514 } /* ieee80211_rx_h_sta_process */
1515
1516 static ieee80211_rx_result debug_noinline
1517 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1518 {
1519         struct sk_buff *skb = rx->skb;
1520         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1521         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1522         int keyidx;
1523         int hdrlen;
1524         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1525         struct ieee80211_key *sta_ptk = NULL;
1526         int mmie_keyidx = -1;
1527         __le16 fc;
1528         const struct ieee80211_cipher_scheme *cs = NULL;
1529
1530         /*
1531          * Key selection 101
1532          *
1533          * There are four types of keys:
1534          *  - GTK (group keys)
1535          *  - IGTK (group keys for management frames)
1536          *  - PTK (pairwise keys)
1537          *  - STK (station-to-station pairwise keys)
1538          *
1539          * When selecting a key, we have to distinguish between multicast
1540          * (including broadcast) and unicast frames, the latter can only
1541          * use PTKs and STKs while the former always use GTKs and IGTKs.
1542          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1543          * unicast frames can also use key indices like GTKs. Hence, if we
1544          * don't have a PTK/STK we check the key index for a WEP key.
1545          *
1546          * Note that in a regular BSS, multicast frames are sent by the
1547          * AP only, associated stations unicast the frame to the AP first
1548          * which then multicasts it on their behalf.
1549          *
1550          * There is also a slight problem in IBSS mode: GTKs are negotiated
1551          * with each station, that is something we don't currently handle.
1552          * The spec seems to expect that one negotiates the same key with
1553          * every station but there's no such requirement; VLANs could be
1554          * possible.
1555          */
1556
1557         /* start without a key */
1558         rx->key = NULL;
1559         fc = hdr->frame_control;
1560
1561         if (rx->sta) {
1562                 int keyid = rx->sta->ptk_idx;
1563
1564                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1565                         cs = rx->sta->cipher_scheme;
1566                         keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1567                         if (unlikely(keyid < 0))
1568                                 return RX_DROP_UNUSABLE;
1569                 }
1570                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1571         }
1572
1573         if (!ieee80211_has_protected(fc))
1574                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1575
1576         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1577                 rx->key = sta_ptk;
1578                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1579                     (status->flag & RX_FLAG_IV_STRIPPED))
1580                         return RX_CONTINUE;
1581                 /* Skip decryption if the frame is not protected. */
1582                 if (!ieee80211_has_protected(fc))
1583                         return RX_CONTINUE;
1584         } else if (mmie_keyidx >= 0) {
1585                 /* Broadcast/multicast robust management frame / BIP */
1586                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1587                     (status->flag & RX_FLAG_IV_STRIPPED))
1588                         return RX_CONTINUE;
1589
1590                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1591                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1592                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1593                 if (rx->sta)
1594                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1595                 if (!rx->key)
1596                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1597         } else if (!ieee80211_has_protected(fc)) {
1598                 /*
1599                  * The frame was not protected, so skip decryption. However, we
1600                  * need to set rx->key if there is a key that could have been
1601                  * used so that the frame may be dropped if encryption would
1602                  * have been expected.
1603                  */
1604                 struct ieee80211_key *key = NULL;
1605                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1606                 int i;
1607
1608                 if (ieee80211_is_mgmt(fc) &&
1609                     is_multicast_ether_addr(hdr->addr1) &&
1610                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1611                         rx->key = key;
1612                 else {
1613                         if (rx->sta) {
1614                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1615                                         key = rcu_dereference(rx->sta->gtk[i]);
1616                                         if (key)
1617                                                 break;
1618                                 }
1619                         }
1620                         if (!key) {
1621                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1622                                         key = rcu_dereference(sdata->keys[i]);
1623                                         if (key)
1624                                                 break;
1625                                 }
1626                         }
1627                         if (key)
1628                                 rx->key = key;
1629                 }
1630                 return RX_CONTINUE;
1631         } else {
1632                 u8 keyid;
1633
1634                 /*
1635                  * The device doesn't give us the IV so we won't be
1636                  * able to look up the key. That's ok though, we
1637                  * don't need to decrypt the frame, we just won't
1638                  * be able to keep statistics accurate.
1639                  * Except for key threshold notifications, should
1640                  * we somehow allow the driver to tell us which key
1641                  * the hardware used if this flag is set?
1642                  */
1643                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1644                     (status->flag & RX_FLAG_IV_STRIPPED))
1645                         return RX_CONTINUE;
1646
1647                 hdrlen = ieee80211_hdrlen(fc);
1648
1649                 if (cs) {
1650                         keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
1651
1652                         if (unlikely(keyidx < 0))
1653                                 return RX_DROP_UNUSABLE;
1654                 } else {
1655                         if (rx->skb->len < 8 + hdrlen)
1656                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1657                         /*
1658                          * no need to call ieee80211_wep_get_keyidx,
1659                          * it verifies a bunch of things we've done already
1660                          */
1661                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1662                         keyidx = keyid >> 6;
1663                 }
1664
1665                 /* check per-station GTK first, if multicast packet */
1666                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1667                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1668
1669                 /* if not found, try default key */
1670                 if (!rx->key) {
1671                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1672
1673                         /*
1674                          * RSNA-protected unicast frames should always be
1675                          * sent with pairwise or station-to-station keys,
1676                          * but for WEP we allow using a key index as well.
1677                          */
1678                         if (rx->key &&
1679                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1680                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1681                             !is_multicast_ether_addr(hdr->addr1))
1682                                 rx->key = NULL;
1683                 }
1684         }
1685
1686         if (rx->key) {
1687                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1688                         return RX_DROP_MONITOR;
1689
1690                 /* TODO: add threshold stuff again */
1691         } else {
1692                 return RX_DROP_MONITOR;
1693         }
1694
1695         switch (rx->key->conf.cipher) {
1696         case WLAN_CIPHER_SUITE_WEP40:
1697         case WLAN_CIPHER_SUITE_WEP104:
1698                 result = ieee80211_crypto_wep_decrypt(rx);
1699                 break;
1700         case WLAN_CIPHER_SUITE_TKIP:
1701                 result = ieee80211_crypto_tkip_decrypt(rx);
1702                 break;
1703         case WLAN_CIPHER_SUITE_CCMP:
1704                 result = ieee80211_crypto_ccmp_decrypt(
1705                         rx, IEEE80211_CCMP_MIC_LEN);
1706                 break;
1707         case WLAN_CIPHER_SUITE_CCMP_256:
1708                 result = ieee80211_crypto_ccmp_decrypt(
1709                         rx, IEEE80211_CCMP_256_MIC_LEN);
1710                 break;
1711         case WLAN_CIPHER_SUITE_AES_CMAC:
1712                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1713                 break;
1714         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1715                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1716                 break;
1717         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1718         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1719                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1720                 break;
1721         case WLAN_CIPHER_SUITE_GCMP:
1722         case WLAN_CIPHER_SUITE_GCMP_256:
1723                 result = ieee80211_crypto_gcmp_decrypt(rx);
1724                 break;
1725         default:
1726                 result = ieee80211_crypto_hw_decrypt(rx);
1727         }
1728
1729         /* the hdr variable is invalid after the decrypt handlers */
1730
1731         /* either the frame has been decrypted or will be dropped */
1732         status->flag |= RX_FLAG_DECRYPTED;
1733
1734         return result;
1735 }
1736
1737 static inline struct ieee80211_fragment_entry *
1738 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1739                          unsigned int frag, unsigned int seq, int rx_queue,
1740                          struct sk_buff **skb)
1741 {
1742         struct ieee80211_fragment_entry *entry;
1743
1744         entry = &sdata->fragments[sdata->fragment_next++];
1745         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1746                 sdata->fragment_next = 0;
1747
1748         if (!skb_queue_empty(&entry->skb_list))
1749                 __skb_queue_purge(&entry->skb_list);
1750
1751         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1752         *skb = NULL;
1753         entry->first_frag_time = jiffies;
1754         entry->seq = seq;
1755         entry->rx_queue = rx_queue;
1756         entry->last_frag = frag;
1757         entry->check_sequential_pn = false;
1758         entry->extra_len = 0;
1759
1760         return entry;
1761 }
1762
1763 static inline struct ieee80211_fragment_entry *
1764 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1765                           unsigned int frag, unsigned int seq,
1766                           int rx_queue, struct ieee80211_hdr *hdr)
1767 {
1768         struct ieee80211_fragment_entry *entry;
1769         int i, idx;
1770
1771         idx = sdata->fragment_next;
1772         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1773                 struct ieee80211_hdr *f_hdr;
1774
1775                 idx--;
1776                 if (idx < 0)
1777                         idx = IEEE80211_FRAGMENT_MAX - 1;
1778
1779                 entry = &sdata->fragments[idx];
1780                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1781                     entry->rx_queue != rx_queue ||
1782                     entry->last_frag + 1 != frag)
1783                         continue;
1784
1785                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1786
1787                 /*
1788                  * Check ftype and addresses are equal, else check next fragment
1789                  */
1790                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1791                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1792                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1793                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1794                         continue;
1795
1796                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1797                         __skb_queue_purge(&entry->skb_list);
1798                         continue;
1799                 }
1800                 return entry;
1801         }
1802
1803         return NULL;
1804 }
1805
1806 static ieee80211_rx_result debug_noinline
1807 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1808 {
1809         struct ieee80211_hdr *hdr;
1810         u16 sc;
1811         __le16 fc;
1812         unsigned int frag, seq;
1813         struct ieee80211_fragment_entry *entry;
1814         struct sk_buff *skb;
1815         struct ieee80211_rx_status *status;
1816
1817         hdr = (struct ieee80211_hdr *)rx->skb->data;
1818         fc = hdr->frame_control;
1819
1820         if (ieee80211_is_ctl(fc))
1821                 return RX_CONTINUE;
1822
1823         sc = le16_to_cpu(hdr->seq_ctrl);
1824         frag = sc & IEEE80211_SCTL_FRAG;
1825
1826         if (is_multicast_ether_addr(hdr->addr1)) {
1827                 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
1828                 goto out_no_led;
1829         }
1830
1831         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1832                 goto out;
1833
1834         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1835
1836         if (skb_linearize(rx->skb))
1837                 return RX_DROP_UNUSABLE;
1838
1839         /*
1840          *  skb_linearize() might change the skb->data and
1841          *  previously cached variables (in this case, hdr) need to
1842          *  be refreshed with the new data.
1843          */
1844         hdr = (struct ieee80211_hdr *)rx->skb->data;
1845         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1846
1847         if (frag == 0) {
1848                 /* This is the first fragment of a new frame. */
1849                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1850                                                  rx->seqno_idx, &(rx->skb));
1851                 if (rx->key &&
1852                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
1853                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
1854                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
1855                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
1856                     ieee80211_has_protected(fc)) {
1857                         int queue = rx->security_idx;
1858
1859                         /* Store CCMP/GCMP PN so that we can verify that the
1860                          * next fragment has a sequential PN value.
1861                          */
1862                         entry->check_sequential_pn = true;
1863                         memcpy(entry->last_pn,
1864                                rx->key->u.ccmp.rx_pn[queue],
1865                                IEEE80211_CCMP_PN_LEN);
1866                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
1867                                               u.ccmp.rx_pn) !=
1868                                      offsetof(struct ieee80211_key,
1869                                               u.gcmp.rx_pn));
1870                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
1871                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
1872                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
1873                                      IEEE80211_GCMP_PN_LEN);
1874                 }
1875                 return RX_QUEUED;
1876         }
1877
1878         /* This is a fragment for a frame that should already be pending in
1879          * fragment cache. Add this fragment to the end of the pending entry.
1880          */
1881         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1882                                           rx->seqno_idx, hdr);
1883         if (!entry) {
1884                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1885                 return RX_DROP_MONITOR;
1886         }
1887
1888         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
1889          *  MPDU PN values are not incrementing in steps of 1."
1890          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
1891          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
1892          */
1893         if (entry->check_sequential_pn) {
1894                 int i;
1895                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1896                 int queue;
1897
1898                 if (!rx->key ||
1899                     (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
1900                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
1901                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
1902                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
1903                         return RX_DROP_UNUSABLE;
1904                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1905                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1906                         pn[i]++;
1907                         if (pn[i])
1908                                 break;
1909                 }
1910                 queue = rx->security_idx;
1911                 rpn = rx->key->u.ccmp.rx_pn[queue];
1912                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1913                         return RX_DROP_UNUSABLE;
1914                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1915         }
1916
1917         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1918         __skb_queue_tail(&entry->skb_list, rx->skb);
1919         entry->last_frag = frag;
1920         entry->extra_len += rx->skb->len;
1921         if (ieee80211_has_morefrags(fc)) {
1922                 rx->skb = NULL;
1923                 return RX_QUEUED;
1924         }
1925
1926         rx->skb = __skb_dequeue(&entry->skb_list);
1927         if (skb_tailroom(rx->skb) < entry->extra_len) {
1928                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
1929                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1930                                               GFP_ATOMIC))) {
1931                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1932                         __skb_queue_purge(&entry->skb_list);
1933                         return RX_DROP_UNUSABLE;
1934                 }
1935         }
1936         while ((skb = __skb_dequeue(&entry->skb_list))) {
1937                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1938                 dev_kfree_skb(skb);
1939         }
1940
1941         /* Complete frame has been reassembled - process it now */
1942         status = IEEE80211_SKB_RXCB(rx->skb);
1943
1944  out:
1945         ieee80211_led_rx(rx->local);
1946  out_no_led:
1947         if (rx->sta)
1948                 rx->sta->rx_stats.packets++;
1949         return RX_CONTINUE;
1950 }
1951
1952 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1953 {
1954         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1955                 return -EACCES;
1956
1957         return 0;
1958 }
1959
1960 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1961 {
1962         struct sk_buff *skb = rx->skb;
1963         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1964
1965         /*
1966          * Pass through unencrypted frames if the hardware has
1967          * decrypted them already.
1968          */
1969         if (status->flag & RX_FLAG_DECRYPTED)
1970                 return 0;
1971
1972         /* Drop unencrypted frames if key is set. */
1973         if (unlikely(!ieee80211_has_protected(fc) &&
1974                      !ieee80211_is_nullfunc(fc) &&
1975                      ieee80211_is_data(fc) && rx->key))
1976                 return -EACCES;
1977
1978         return 0;
1979 }
1980
1981 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1982 {
1983         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1984         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1985         __le16 fc = hdr->frame_control;
1986
1987         /*
1988          * Pass through unencrypted frames if the hardware has
1989          * decrypted them already.
1990          */
1991         if (status->flag & RX_FLAG_DECRYPTED)
1992                 return 0;
1993
1994         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1995                 if (unlikely(!ieee80211_has_protected(fc) &&
1996                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1997                              rx->key)) {
1998                         if (ieee80211_is_deauth(fc) ||
1999                             ieee80211_is_disassoc(fc))
2000                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2001                                                              rx->skb->data,
2002                                                              rx->skb->len);
2003                         return -EACCES;
2004                 }
2005                 /* BIP does not use Protected field, so need to check MMIE */
2006                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2007                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2008                         if (ieee80211_is_deauth(fc) ||
2009                             ieee80211_is_disassoc(fc))
2010                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2011                                                              rx->skb->data,
2012                                                              rx->skb->len);
2013                         return -EACCES;
2014                 }
2015                 /*
2016                  * When using MFP, Action frames are not allowed prior to
2017                  * having configured keys.
2018                  */
2019                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2020                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2021                         return -EACCES;
2022         }
2023
2024         return 0;
2025 }
2026
2027 static int
2028 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2029 {
2030         struct ieee80211_sub_if_data *sdata = rx->sdata;
2031         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2032         bool check_port_control = false;
2033         struct ethhdr *ehdr;
2034         int ret;
2035
2036         *port_control = false;
2037         if (ieee80211_has_a4(hdr->frame_control) &&
2038             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2039                 return -1;
2040
2041         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2042             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2043
2044                 if (!sdata->u.mgd.use_4addr)
2045                         return -1;
2046                 else
2047                         check_port_control = true;
2048         }
2049
2050         if (is_multicast_ether_addr(hdr->addr1) &&
2051             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2052                 return -1;
2053
2054         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2055         if (ret < 0)
2056                 return ret;
2057
2058         ehdr = (struct ethhdr *) rx->skb->data;
2059         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2060                 *port_control = true;
2061         else if (check_port_control)
2062                 return -1;
2063
2064         return 0;
2065 }
2066
2067 /*
2068  * requires that rx->skb is a frame with ethernet header
2069  */
2070 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2071 {
2072         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2073                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2074         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2075
2076         /*
2077          * Allow EAPOL frames to us/the PAE group address regardless
2078          * of whether the frame was encrypted or not.
2079          */
2080         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2081             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2082              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2083                 return true;
2084
2085         if (ieee80211_802_1x_port_control(rx) ||
2086             ieee80211_drop_unencrypted(rx, fc))
2087                 return false;
2088
2089         return true;
2090 }
2091
2092 /*
2093  * requires that rx->skb is a frame with ethernet header
2094  */
2095 static void
2096 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2097 {
2098         struct ieee80211_sub_if_data *sdata = rx->sdata;
2099         struct net_device *dev = sdata->dev;
2100         struct sk_buff *skb, *xmit_skb;
2101         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2102         struct sta_info *dsta;
2103
2104         skb = rx->skb;
2105         xmit_skb = NULL;
2106
2107         ieee80211_rx_stats(dev, skb->len);
2108
2109         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2110              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2111             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2112             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2113                 if (is_multicast_ether_addr(ehdr->h_dest)) {
2114                         /*
2115                          * send multicast frames both to higher layers in
2116                          * local net stack and back to the wireless medium
2117                          */
2118                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2119                         if (!xmit_skb)
2120                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2121                                                     dev->name);
2122                 } else {
2123                         dsta = sta_info_get(sdata, skb->data);
2124                         if (dsta) {
2125                                 /*
2126                                  * The destination station is associated to
2127                                  * this AP (in this VLAN), so send the frame
2128                                  * directly to it and do not pass it to local
2129                                  * net stack.
2130                                  */
2131                                 xmit_skb = skb;
2132                                 skb = NULL;
2133                         }
2134                 }
2135         }
2136
2137 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2138         if (skb) {
2139                 /* 'align' will only take the values 0 or 2 here since all
2140                  * frames are required to be aligned to 2-byte boundaries
2141                  * when being passed to mac80211; the code here works just
2142                  * as well if that isn't true, but mac80211 assumes it can
2143                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2144                  */
2145                 int align;
2146
2147                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2148                 if (align) {
2149                         if (WARN_ON(skb_headroom(skb) < 3)) {
2150                                 dev_kfree_skb(skb);
2151                                 skb = NULL;
2152                         } else {
2153                                 u8 *data = skb->data;
2154                                 size_t len = skb_headlen(skb);
2155                                 skb->data -= align;
2156                                 memmove(skb->data, data, len);
2157                                 skb_set_tail_pointer(skb, len);
2158                         }
2159                 }
2160         }
2161 #endif
2162
2163         if (skb) {
2164                 /* deliver to local stack */
2165                 skb->protocol = eth_type_trans(skb, dev);
2166                 memset(skb->cb, 0, sizeof(skb->cb));
2167                 if (rx->napi)
2168                         napi_gro_receive(rx->napi, skb);
2169                 else
2170                         netif_receive_skb(skb);
2171         }
2172
2173         if (xmit_skb) {
2174                 /*
2175                  * Send to wireless media and increase priority by 256 to
2176                  * keep the received priority instead of reclassifying
2177                  * the frame (see cfg80211_classify8021d).
2178                  */
2179                 xmit_skb->priority += 256;
2180                 xmit_skb->protocol = htons(ETH_P_802_3);
2181                 skb_reset_network_header(xmit_skb);
2182                 skb_reset_mac_header(xmit_skb);
2183                 dev_queue_xmit(xmit_skb);
2184         }
2185 }
2186
2187 static ieee80211_rx_result debug_noinline
2188 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2189 {
2190         struct net_device *dev = rx->sdata->dev;
2191         struct sk_buff *skb = rx->skb;
2192         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2193         __le16 fc = hdr->frame_control;
2194         struct sk_buff_head frame_list;
2195         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2196
2197         if (unlikely(!ieee80211_is_data(fc)))
2198                 return RX_CONTINUE;
2199
2200         if (unlikely(!ieee80211_is_data_present(fc)))
2201                 return RX_DROP_MONITOR;
2202
2203         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2204                 return RX_CONTINUE;
2205
2206         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2207                 switch (rx->sdata->vif.type) {
2208                 case NL80211_IFTYPE_AP_VLAN:
2209                         if (!rx->sdata->u.vlan.sta)
2210                                 return RX_DROP_UNUSABLE;
2211                         break;
2212                 case NL80211_IFTYPE_STATION:
2213                         if (!rx->sdata->u.mgd.use_4addr)
2214                                 return RX_DROP_UNUSABLE;
2215                         break;
2216                 default:
2217                         return RX_DROP_UNUSABLE;
2218                 }
2219         }
2220
2221         if (is_multicast_ether_addr(hdr->addr1))
2222                 return RX_DROP_UNUSABLE;
2223
2224         skb->dev = dev;
2225         __skb_queue_head_init(&frame_list);
2226
2227         if (skb_linearize(skb))
2228                 return RX_DROP_UNUSABLE;
2229
2230         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2231                                  rx->sdata->vif.type,
2232                                  rx->local->hw.extra_tx_headroom, true);
2233
2234         while (!skb_queue_empty(&frame_list)) {
2235                 rx->skb = __skb_dequeue(&frame_list);
2236
2237                 if (!ieee80211_frame_allowed(rx, fc)) {
2238                         dev_kfree_skb(rx->skb);
2239                         continue;
2240                 }
2241
2242                 ieee80211_deliver_skb(rx);
2243         }
2244
2245         return RX_QUEUED;
2246 }
2247
2248 #ifdef CONFIG_MAC80211_MESH
2249 static ieee80211_rx_result
2250 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2251 {
2252         struct ieee80211_hdr *fwd_hdr, *hdr;
2253         struct ieee80211_tx_info *info;
2254         struct ieee80211s_hdr *mesh_hdr;
2255         struct sk_buff *skb = rx->skb, *fwd_skb;
2256         struct ieee80211_local *local = rx->local;
2257         struct ieee80211_sub_if_data *sdata = rx->sdata;
2258         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2259         u16 ac, q, hdrlen;
2260
2261         hdr = (struct ieee80211_hdr *) skb->data;
2262         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2263
2264         /* make sure fixed part of mesh header is there, also checks skb len */
2265         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2266                 return RX_DROP_MONITOR;
2267
2268         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2269
2270         /* make sure full mesh header is there, also checks skb len */
2271         if (!pskb_may_pull(rx->skb,
2272                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2273                 return RX_DROP_MONITOR;
2274
2275         /* reload pointers */
2276         hdr = (struct ieee80211_hdr *) skb->data;
2277         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2278
2279         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2280                 return RX_DROP_MONITOR;
2281
2282         /* frame is in RMC, don't forward */
2283         if (ieee80211_is_data(hdr->frame_control) &&
2284             is_multicast_ether_addr(hdr->addr1) &&
2285             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2286                 return RX_DROP_MONITOR;
2287
2288         if (!ieee80211_is_data(hdr->frame_control))
2289                 return RX_CONTINUE;
2290
2291         if (!mesh_hdr->ttl)
2292                 return RX_DROP_MONITOR;
2293
2294         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2295                 struct mesh_path *mppath;
2296                 char *proxied_addr;
2297                 char *mpp_addr;
2298
2299                 if (is_multicast_ether_addr(hdr->addr1)) {
2300                         mpp_addr = hdr->addr3;
2301                         proxied_addr = mesh_hdr->eaddr1;
2302                 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2303                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2304                         mpp_addr = hdr->addr4;
2305                         proxied_addr = mesh_hdr->eaddr2;
2306                 } else {
2307                         return RX_DROP_MONITOR;
2308                 }
2309
2310                 rcu_read_lock();
2311                 mppath = mpp_path_lookup(sdata, proxied_addr);
2312                 if (!mppath) {
2313                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2314                 } else {
2315                         spin_lock_bh(&mppath->state_lock);
2316                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2317                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2318                         spin_unlock_bh(&mppath->state_lock);
2319                 }
2320                 rcu_read_unlock();
2321         }
2322
2323         /* Frame has reached destination.  Don't forward */
2324         if (!is_multicast_ether_addr(hdr->addr1) &&
2325             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2326                 return RX_CONTINUE;
2327
2328         ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2329         q = sdata->vif.hw_queue[ac];
2330         if (ieee80211_queue_stopped(&local->hw, q)) {
2331                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2332                 return RX_DROP_MONITOR;
2333         }
2334         skb_set_queue_mapping(skb, q);
2335
2336         if (!--mesh_hdr->ttl) {
2337                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2338                 goto out;
2339         }
2340
2341         if (!ifmsh->mshcfg.dot11MeshForwarding)
2342                 goto out;
2343
2344         fwd_skb = skb_copy(skb, GFP_ATOMIC);
2345         if (!fwd_skb) {
2346                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2347                                     sdata->name);
2348                 goto out;
2349         }
2350
2351         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2352         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2353         info = IEEE80211_SKB_CB(fwd_skb);
2354         memset(info, 0, sizeof(*info));
2355         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2356         info->control.vif = &rx->sdata->vif;
2357         info->control.jiffies = jiffies;
2358         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2359                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2360                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2361                 /* update power mode indication when forwarding */
2362                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2363         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2364                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2365                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2366         } else {
2367                 /* unable to resolve next hop */
2368                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2369                                    fwd_hdr->addr3, 0,
2370                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2371                                    fwd_hdr->addr2);
2372                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2373                 kfree_skb(fwd_skb);
2374                 return RX_DROP_MONITOR;
2375         }
2376
2377         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2378         ieee80211_add_pending_skb(local, fwd_skb);
2379  out:
2380         if (is_multicast_ether_addr(hdr->addr1))
2381                 return RX_CONTINUE;
2382         return RX_DROP_MONITOR;
2383 }
2384 #endif
2385
2386 static ieee80211_rx_result debug_noinline
2387 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2388 {
2389         struct ieee80211_sub_if_data *sdata = rx->sdata;
2390         struct ieee80211_local *local = rx->local;
2391         struct net_device *dev = sdata->dev;
2392         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2393         __le16 fc = hdr->frame_control;
2394         bool port_control;
2395         int err;
2396
2397         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2398                 return RX_CONTINUE;
2399
2400         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2401                 return RX_DROP_MONITOR;
2402
2403         if (rx->sta) {
2404                 /* The seqno index has the same property as needed
2405                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2406                  * for non-QoS-data frames. Here we know it's a data
2407                  * frame, so count MSDUs.
2408                  */
2409                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2410         }
2411
2412         /*
2413          * Send unexpected-4addr-frame event to hostapd. For older versions,
2414          * also drop the frame to cooked monitor interfaces.
2415          */
2416         if (ieee80211_has_a4(hdr->frame_control) &&
2417             sdata->vif.type == NL80211_IFTYPE_AP) {
2418                 if (rx->sta &&
2419                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2420                         cfg80211_rx_unexpected_4addr_frame(
2421                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2422                 return RX_DROP_MONITOR;
2423         }
2424
2425         err = __ieee80211_data_to_8023(rx, &port_control);
2426         if (unlikely(err))
2427                 return RX_DROP_UNUSABLE;
2428
2429         if (!ieee80211_frame_allowed(rx, fc))
2430                 return RX_DROP_MONITOR;
2431
2432         /* directly handle TDLS channel switch requests/responses */
2433         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2434                                                 cpu_to_be16(ETH_P_TDLS))) {
2435                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2436
2437                 if (pskb_may_pull(rx->skb,
2438                                   offsetof(struct ieee80211_tdls_data, u)) &&
2439                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2440                     tf->category == WLAN_CATEGORY_TDLS &&
2441                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2442                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2443                         skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2444                         schedule_work(&local->tdls_chsw_work);
2445                         if (rx->sta)
2446                                 rx->sta->rx_stats.packets++;
2447
2448                         return RX_QUEUED;
2449                 }
2450         }
2451
2452         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2453             unlikely(port_control) && sdata->bss) {
2454                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2455                                      u.ap);
2456                 dev = sdata->dev;
2457                 rx->sdata = sdata;
2458         }
2459
2460         rx->skb->dev = dev;
2461
2462         if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2463             !is_multicast_ether_addr(
2464                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2465             (!local->scanning &&
2466              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2467                         mod_timer(&local->dynamic_ps_timer, jiffies +
2468                          msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2469         }
2470
2471         ieee80211_deliver_skb(rx);
2472
2473         return RX_QUEUED;
2474 }
2475
2476 static ieee80211_rx_result debug_noinline
2477 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2478 {
2479         struct sk_buff *skb = rx->skb;
2480         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2481         struct tid_ampdu_rx *tid_agg_rx;
2482         u16 start_seq_num;
2483         u16 tid;
2484
2485         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2486                 return RX_CONTINUE;
2487
2488         if (ieee80211_is_back_req(bar->frame_control)) {
2489                 struct {
2490                         __le16 control, start_seq_num;
2491                 } __packed bar_data;
2492                 struct ieee80211_event event = {
2493                         .type = BAR_RX_EVENT,
2494                 };
2495
2496                 if (!rx->sta)
2497                         return RX_DROP_MONITOR;
2498
2499                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2500                                   &bar_data, sizeof(bar_data)))
2501                         return RX_DROP_MONITOR;
2502
2503                 tid = le16_to_cpu(bar_data.control) >> 12;
2504
2505                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2506                 if (!tid_agg_rx)
2507                         return RX_DROP_MONITOR;
2508
2509                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2510                 event.u.ba.tid = tid;
2511                 event.u.ba.ssn = start_seq_num;
2512                 event.u.ba.sta = &rx->sta->sta;
2513
2514                 /* reset session timer */
2515                 if (tid_agg_rx->timeout)
2516                         mod_timer(&tid_agg_rx->session_timer,
2517                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2518
2519                 spin_lock(&tid_agg_rx->reorder_lock);
2520                 /* release stored frames up to start of BAR */
2521                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2522                                                  start_seq_num, frames);
2523                 spin_unlock(&tid_agg_rx->reorder_lock);
2524
2525                 drv_event_callback(rx->local, rx->sdata, &event);
2526
2527                 kfree_skb(skb);
2528                 return RX_QUEUED;
2529         }
2530
2531         /*
2532          * After this point, we only want management frames,
2533          * so we can drop all remaining control frames to
2534          * cooked monitor interfaces.
2535          */
2536         return RX_DROP_MONITOR;
2537 }
2538
2539 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2540                                            struct ieee80211_mgmt *mgmt,
2541                                            size_t len)
2542 {
2543         struct ieee80211_local *local = sdata->local;
2544         struct sk_buff *skb;
2545         struct ieee80211_mgmt *resp;
2546
2547         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2548                 /* Not to own unicast address */
2549                 return;
2550         }
2551
2552         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2553             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2554                 /* Not from the current AP or not associated yet. */
2555                 return;
2556         }
2557
2558         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2559                 /* Too short SA Query request frame */
2560                 return;
2561         }
2562
2563         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2564         if (skb == NULL)
2565                 return;
2566
2567         skb_reserve(skb, local->hw.extra_tx_headroom);
2568         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2569         memset(resp, 0, 24);
2570         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2571         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2572         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2573         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2574                                           IEEE80211_STYPE_ACTION);
2575         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2576         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2577         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2578         memcpy(resp->u.action.u.sa_query.trans_id,
2579                mgmt->u.action.u.sa_query.trans_id,
2580                WLAN_SA_QUERY_TR_ID_LEN);
2581
2582         ieee80211_tx_skb(sdata, skb);
2583 }
2584
2585 static ieee80211_rx_result debug_noinline
2586 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2587 {
2588         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2589         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2590
2591         /*
2592          * From here on, look only at management frames.
2593          * Data and control frames are already handled,
2594          * and unknown (reserved) frames are useless.
2595          */
2596         if (rx->skb->len < 24)
2597                 return RX_DROP_MONITOR;
2598
2599         if (!ieee80211_is_mgmt(mgmt->frame_control))
2600                 return RX_DROP_MONITOR;
2601
2602         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2603             ieee80211_is_beacon(mgmt->frame_control) &&
2604             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2605                 int sig = 0;
2606
2607                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
2608                         sig = status->signal;
2609
2610                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2611                                             rx->skb->data, rx->skb->len,
2612                                             status->freq, sig);
2613                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2614         }
2615
2616         if (ieee80211_drop_unencrypted_mgmt(rx))
2617                 return RX_DROP_UNUSABLE;
2618
2619         return RX_CONTINUE;
2620 }
2621
2622 static ieee80211_rx_result debug_noinline
2623 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2624 {
2625         struct ieee80211_local *local = rx->local;
2626         struct ieee80211_sub_if_data *sdata = rx->sdata;
2627         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2628         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2629         int len = rx->skb->len;
2630
2631         if (!ieee80211_is_action(mgmt->frame_control))
2632                 return RX_CONTINUE;
2633
2634         /* drop too small frames */
2635         if (len < IEEE80211_MIN_ACTION_SIZE)
2636                 return RX_DROP_UNUSABLE;
2637
2638         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2639             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2640             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2641                 return RX_DROP_UNUSABLE;
2642
2643         switch (mgmt->u.action.category) {
2644         case WLAN_CATEGORY_HT:
2645                 /* reject HT action frames from stations not supporting HT */
2646                 if (!rx->sta->sta.ht_cap.ht_supported)
2647                         goto invalid;
2648
2649                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2650                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2651                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2652                     sdata->vif.type != NL80211_IFTYPE_AP &&
2653                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2654                         break;
2655
2656                 /* verify action & smps_control/chanwidth are present */
2657                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2658                         goto invalid;
2659
2660                 switch (mgmt->u.action.u.ht_smps.action) {
2661                 case WLAN_HT_ACTION_SMPS: {
2662                         struct ieee80211_supported_band *sband;
2663                         enum ieee80211_smps_mode smps_mode;
2664
2665                         /* convert to HT capability */
2666                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2667                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2668                                 smps_mode = IEEE80211_SMPS_OFF;
2669                                 break;
2670                         case WLAN_HT_SMPS_CONTROL_STATIC:
2671                                 smps_mode = IEEE80211_SMPS_STATIC;
2672                                 break;
2673                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2674                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2675                                 break;
2676                         default:
2677                                 goto invalid;
2678                         }
2679
2680                         /* if no change do nothing */
2681                         if (rx->sta->sta.smps_mode == smps_mode)
2682                                 goto handled;
2683                         rx->sta->sta.smps_mode = smps_mode;
2684
2685                         sband = rx->local->hw.wiphy->bands[status->band];
2686
2687                         rate_control_rate_update(local, sband, rx->sta,
2688                                                  IEEE80211_RC_SMPS_CHANGED);
2689                         goto handled;
2690                 }
2691                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2692                         struct ieee80211_supported_band *sband;
2693                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2694                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
2695
2696                         /* If it doesn't support 40 MHz it can't change ... */
2697                         if (!(rx->sta->sta.ht_cap.cap &
2698                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2699                                 goto handled;
2700
2701                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2702                                 max_bw = IEEE80211_STA_RX_BW_20;
2703                         else
2704                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2705
2706                         /* set cur_max_bandwidth and recalc sta bw */
2707                         rx->sta->cur_max_bandwidth = max_bw;
2708                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2709
2710                         if (rx->sta->sta.bandwidth == new_bw)
2711                                 goto handled;
2712
2713                         rx->sta->sta.bandwidth = new_bw;
2714                         sband = rx->local->hw.wiphy->bands[status->band];
2715
2716                         rate_control_rate_update(local, sband, rx->sta,
2717                                                  IEEE80211_RC_BW_CHANGED);
2718                         goto handled;
2719                 }
2720                 default:
2721                         goto invalid;
2722                 }
2723
2724                 break;
2725         case WLAN_CATEGORY_PUBLIC:
2726                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2727                         goto invalid;
2728                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2729                         break;
2730                 if (!rx->sta)
2731                         break;
2732                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2733                         break;
2734                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2735                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2736                         break;
2737                 if (len < offsetof(struct ieee80211_mgmt,
2738                                    u.action.u.ext_chan_switch.variable))
2739                         goto invalid;
2740                 goto queue;
2741         case WLAN_CATEGORY_VHT:
2742                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2743                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2744                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2745                     sdata->vif.type != NL80211_IFTYPE_AP &&
2746                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2747                         break;
2748
2749                 /* verify action code is present */
2750                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2751                         goto invalid;
2752
2753                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2754                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2755                         u8 opmode;
2756
2757                         /* verify opmode is present */
2758                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2759                                 goto invalid;
2760
2761                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2762
2763                         ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2764                                                     opmode, status->band);
2765                         goto handled;
2766                 }
2767                 default:
2768                         break;
2769                 }
2770                 break;
2771         case WLAN_CATEGORY_BACK:
2772                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2773                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2774                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2775                     sdata->vif.type != NL80211_IFTYPE_AP &&
2776                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2777                         break;
2778
2779                 /* verify action_code is present */
2780                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2781                         break;
2782
2783                 switch (mgmt->u.action.u.addba_req.action_code) {
2784                 case WLAN_ACTION_ADDBA_REQ:
2785                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2786                                    sizeof(mgmt->u.action.u.addba_req)))
2787                                 goto invalid;
2788                         break;
2789                 case WLAN_ACTION_ADDBA_RESP:
2790                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2791                                    sizeof(mgmt->u.action.u.addba_resp)))
2792                                 goto invalid;
2793                         break;
2794                 case WLAN_ACTION_DELBA:
2795                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2796                                    sizeof(mgmt->u.action.u.delba)))
2797                                 goto invalid;
2798                         break;
2799                 default:
2800                         goto invalid;
2801                 }
2802
2803                 goto queue;
2804         case WLAN_CATEGORY_SPECTRUM_MGMT:
2805                 /* verify action_code is present */
2806                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2807                         break;
2808
2809                 switch (mgmt->u.action.u.measurement.action_code) {
2810                 case WLAN_ACTION_SPCT_MSR_REQ:
2811                         if (status->band != IEEE80211_BAND_5GHZ)
2812                                 break;
2813
2814                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2815                                    sizeof(mgmt->u.action.u.measurement)))
2816                                 break;
2817
2818                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2819                                 break;
2820
2821                         ieee80211_process_measurement_req(sdata, mgmt, len);
2822                         goto handled;
2823                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2824                         u8 *bssid;
2825                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2826                                    sizeof(mgmt->u.action.u.chan_switch)))
2827                                 break;
2828
2829                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2830                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2831                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2832                                 break;
2833
2834                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2835                                 bssid = sdata->u.mgd.bssid;
2836                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2837                                 bssid = sdata->u.ibss.bssid;
2838                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2839                                 bssid = mgmt->sa;
2840                         else
2841                                 break;
2842
2843                         if (!ether_addr_equal(mgmt->bssid, bssid))
2844                                 break;
2845
2846                         goto queue;
2847                         }
2848                 }
2849                 break;
2850         case WLAN_CATEGORY_SA_QUERY:
2851                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2852                            sizeof(mgmt->u.action.u.sa_query)))
2853                         break;
2854
2855                 switch (mgmt->u.action.u.sa_query.action) {
2856                 case WLAN_ACTION_SA_QUERY_REQUEST:
2857                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2858                                 break;
2859                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2860                         goto handled;
2861                 }
2862                 break;
2863         case WLAN_CATEGORY_SELF_PROTECTED:
2864                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2865                            sizeof(mgmt->u.action.u.self_prot.action_code)))
2866                         break;
2867
2868                 switch (mgmt->u.action.u.self_prot.action_code) {
2869                 case WLAN_SP_MESH_PEERING_OPEN:
2870                 case WLAN_SP_MESH_PEERING_CLOSE:
2871                 case WLAN_SP_MESH_PEERING_CONFIRM:
2872                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2873                                 goto invalid;
2874                         if (sdata->u.mesh.user_mpm)
2875                                 /* userspace handles this frame */
2876                                 break;
2877                         goto queue;
2878                 case WLAN_SP_MGK_INFORM:
2879                 case WLAN_SP_MGK_ACK:
2880                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2881                                 goto invalid;
2882                         break;
2883                 }
2884                 break;
2885         case WLAN_CATEGORY_MESH_ACTION:
2886                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2887                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
2888                         break;
2889
2890                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2891                         break;
2892                 if (mesh_action_is_path_sel(mgmt) &&
2893                     !mesh_path_sel_is_hwmp(sdata))
2894                         break;
2895                 goto queue;
2896         }
2897
2898         return RX_CONTINUE;
2899
2900  invalid:
2901         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2902         /* will return in the next handlers */
2903         return RX_CONTINUE;
2904
2905  handled:
2906         if (rx->sta)
2907                 rx->sta->rx_stats.packets++;
2908         dev_kfree_skb(rx->skb);
2909         return RX_QUEUED;
2910
2911  queue:
2912         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2913         skb_queue_tail(&sdata->skb_queue, rx->skb);
2914         ieee80211_queue_work(&local->hw, &sdata->work);
2915         if (rx->sta)
2916                 rx->sta->rx_stats.packets++;
2917         return RX_QUEUED;
2918 }
2919
2920 static ieee80211_rx_result debug_noinline
2921 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2922 {
2923         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2924         int sig = 0;
2925
2926         /* skip known-bad action frames and return them in the next handler */
2927         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2928                 return RX_CONTINUE;
2929
2930         /*
2931          * Getting here means the kernel doesn't know how to handle
2932          * it, but maybe userspace does ... include returned frames
2933          * so userspace can register for those to know whether ones
2934          * it transmitted were processed or returned.
2935          */
2936
2937         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
2938                 sig = status->signal;
2939
2940         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2941                              rx->skb->data, rx->skb->len, 0)) {
2942                 if (rx->sta)
2943                         rx->sta->rx_stats.packets++;
2944                 dev_kfree_skb(rx->skb);
2945                 return RX_QUEUED;
2946         }
2947
2948         return RX_CONTINUE;
2949 }
2950
2951 static ieee80211_rx_result debug_noinline
2952 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2953 {
2954         struct ieee80211_local *local = rx->local;
2955         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2956         struct sk_buff *nskb;
2957         struct ieee80211_sub_if_data *sdata = rx->sdata;
2958         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2959
2960         if (!ieee80211_is_action(mgmt->frame_control))
2961                 return RX_CONTINUE;
2962
2963         /*
2964          * For AP mode, hostapd is responsible for handling any action
2965          * frames that we didn't handle, including returning unknown
2966          * ones. For all other modes we will return them to the sender,
2967          * setting the 0x80 bit in the action category, as required by
2968          * 802.11-2012 9.24.4.
2969          * Newer versions of hostapd shall also use the management frame
2970          * registration mechanisms, but older ones still use cooked
2971          * monitor interfaces so push all frames there.
2972          */
2973         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2974             (sdata->vif.type == NL80211_IFTYPE_AP ||
2975              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2976                 return RX_DROP_MONITOR;
2977
2978         if (is_multicast_ether_addr(mgmt->da))
2979                 return RX_DROP_MONITOR;
2980
2981         /* do not return rejected action frames */
2982         if (mgmt->u.action.category & 0x80)
2983                 return RX_DROP_UNUSABLE;
2984
2985         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2986                                GFP_ATOMIC);
2987         if (nskb) {
2988                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2989
2990                 nmgmt->u.action.category |= 0x80;
2991                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2992                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2993
2994                 memset(nskb->cb, 0, sizeof(nskb->cb));
2995
2996                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2997                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2998
2999                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3000                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3001                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3002                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3003                                 info->hw_queue =
3004                                         local->hw.offchannel_tx_hw_queue;
3005                 }
3006
3007                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3008                                             status->band);
3009         }
3010         dev_kfree_skb(rx->skb);
3011         return RX_QUEUED;
3012 }
3013
3014 static ieee80211_rx_result debug_noinline
3015 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3016 {
3017         struct ieee80211_sub_if_data *sdata = rx->sdata;
3018         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3019         __le16 stype;
3020
3021         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3022
3023         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3024             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3025             sdata->vif.type != NL80211_IFTYPE_OCB &&
3026             sdata->vif.type != NL80211_IFTYPE_STATION)
3027                 return RX_DROP_MONITOR;
3028
3029         switch (stype) {
3030         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3031         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3032         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3033                 /* process for all: mesh, mlme, ibss */
3034                 break;
3035         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3036         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3037         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3038         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3039                 if (is_multicast_ether_addr(mgmt->da) &&
3040                     !is_broadcast_ether_addr(mgmt->da))
3041                         return RX_DROP_MONITOR;
3042
3043                 /* process only for station */
3044                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3045                         return RX_DROP_MONITOR;
3046                 break;
3047         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3048                 /* process only for ibss and mesh */
3049                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3050                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3051                         return RX_DROP_MONITOR;
3052                 break;
3053         default:
3054                 return RX_DROP_MONITOR;
3055         }
3056
3057         /* queue up frame and kick off work to process it */
3058         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3059         skb_queue_tail(&sdata->skb_queue, rx->skb);
3060         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3061         if (rx->sta)
3062                 rx->sta->rx_stats.packets++;
3063
3064         return RX_QUEUED;
3065 }
3066
3067 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3068                                         struct ieee80211_rate *rate)
3069 {
3070         struct ieee80211_sub_if_data *sdata;
3071         struct ieee80211_local *local = rx->local;
3072         struct sk_buff *skb = rx->skb, *skb2;
3073         struct net_device *prev_dev = NULL;
3074         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3075         int needed_headroom;
3076
3077         /*
3078          * If cooked monitor has been processed already, then
3079          * don't do it again. If not, set the flag.
3080          */
3081         if (rx->flags & IEEE80211_RX_CMNTR)
3082                 goto out_free_skb;
3083         rx->flags |= IEEE80211_RX_CMNTR;
3084
3085         /* If there are no cooked monitor interfaces, just free the SKB */
3086         if (!local->cooked_mntrs)
3087                 goto out_free_skb;
3088
3089         /* vendor data is long removed here */
3090         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3091         /* room for the radiotap header based on driver features */
3092         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3093
3094         if (skb_headroom(skb) < needed_headroom &&
3095             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3096                 goto out_free_skb;
3097
3098         /* prepend radiotap information */
3099         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3100                                          false);
3101
3102         skb_set_mac_header(skb, 0);
3103         skb->ip_summed = CHECKSUM_UNNECESSARY;
3104         skb->pkt_type = PACKET_OTHERHOST;
3105         skb->protocol = htons(ETH_P_802_2);
3106
3107         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3108                 if (!ieee80211_sdata_running(sdata))
3109                         continue;
3110
3111                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3112                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
3113                         continue;
3114
3115                 if (prev_dev) {
3116                         skb2 = skb_clone(skb, GFP_ATOMIC);
3117                         if (skb2) {
3118                                 skb2->dev = prev_dev;
3119                                 netif_receive_skb(skb2);
3120                         }
3121                 }
3122
3123                 prev_dev = sdata->dev;
3124                 ieee80211_rx_stats(sdata->dev, skb->len);
3125         }
3126
3127         if (prev_dev) {
3128                 skb->dev = prev_dev;
3129                 netif_receive_skb(skb);
3130                 return;
3131         }
3132
3133  out_free_skb:
3134         dev_kfree_skb(skb);
3135 }
3136
3137 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3138                                          ieee80211_rx_result res)
3139 {
3140         switch (res) {
3141         case RX_DROP_MONITOR:
3142                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3143                 if (rx->sta)
3144                         rx->sta->rx_stats.dropped++;
3145                 /* fall through */
3146         case RX_CONTINUE: {
3147                 struct ieee80211_rate *rate = NULL;
3148                 struct ieee80211_supported_band *sband;
3149                 struct ieee80211_rx_status *status;
3150
3151                 status = IEEE80211_SKB_RXCB((rx->skb));
3152
3153                 sband = rx->local->hw.wiphy->bands[status->band];
3154                 if (!(status->flag & RX_FLAG_HT) &&
3155                     !(status->flag & RX_FLAG_VHT))
3156                         rate = &sband->bitrates[status->rate_idx];
3157
3158                 ieee80211_rx_cooked_monitor(rx, rate);
3159                 break;
3160                 }
3161         case RX_DROP_UNUSABLE:
3162                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3163                 if (rx->sta)
3164                         rx->sta->rx_stats.dropped++;
3165                 dev_kfree_skb(rx->skb);
3166                 break;
3167         case RX_QUEUED:
3168                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3169                 break;
3170         }
3171 }
3172
3173 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3174                                   struct sk_buff_head *frames)
3175 {
3176         ieee80211_rx_result res = RX_DROP_MONITOR;
3177         struct sk_buff *skb;
3178
3179 #define CALL_RXH(rxh)                   \
3180         do {                            \
3181                 res = rxh(rx);          \
3182                 if (res != RX_CONTINUE) \
3183                         goto rxh_next;  \
3184         } while (0);
3185
3186         /* Lock here to avoid hitting all of the data used in the RX
3187          * path (e.g. key data, station data, ...) concurrently when
3188          * a frame is released from the reorder buffer due to timeout
3189          * from the timer, potentially concurrently with RX from the
3190          * driver.
3191          */
3192         spin_lock_bh(&rx->local->rx_path_lock);
3193
3194         while ((skb = __skb_dequeue(frames))) {
3195                 /*
3196                  * all the other fields are valid across frames
3197                  * that belong to an aMPDU since they are on the
3198                  * same TID from the same station
3199                  */
3200                 rx->skb = skb;
3201
3202                 CALL_RXH(ieee80211_rx_h_check_more_data)
3203                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
3204                 CALL_RXH(ieee80211_rx_h_sta_process)
3205                 CALL_RXH(ieee80211_rx_h_decrypt)
3206                 CALL_RXH(ieee80211_rx_h_defragment)
3207                 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
3208                 /* must be after MMIC verify so header is counted in MPDU mic */
3209 #ifdef CONFIG_MAC80211_MESH
3210                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3211                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3212 #endif
3213                 CALL_RXH(ieee80211_rx_h_amsdu)
3214                 CALL_RXH(ieee80211_rx_h_data)
3215
3216                 /* special treatment -- needs the queue */
3217                 res = ieee80211_rx_h_ctrl(rx, frames);
3218                 if (res != RX_CONTINUE)
3219                         goto rxh_next;
3220
3221                 CALL_RXH(ieee80211_rx_h_mgmt_check)
3222                 CALL_RXH(ieee80211_rx_h_action)
3223                 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
3224                 CALL_RXH(ieee80211_rx_h_action_return)
3225                 CALL_RXH(ieee80211_rx_h_mgmt)
3226
3227  rxh_next:
3228                 ieee80211_rx_handlers_result(rx, res);
3229
3230 #undef CALL_RXH
3231         }
3232
3233         spin_unlock_bh(&rx->local->rx_path_lock);
3234 }
3235
3236 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3237 {
3238         struct sk_buff_head reorder_release;
3239         ieee80211_rx_result res = RX_DROP_MONITOR;
3240
3241         __skb_queue_head_init(&reorder_release);
3242
3243 #define CALL_RXH(rxh)                   \
3244         do {                            \
3245                 res = rxh(rx);          \
3246                 if (res != RX_CONTINUE) \
3247                         goto rxh_next;  \
3248         } while (0);
3249
3250         CALL_RXH(ieee80211_rx_h_check_dup)
3251         CALL_RXH(ieee80211_rx_h_check)
3252
3253         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3254
3255         ieee80211_rx_handlers(rx, &reorder_release);
3256         return;
3257
3258  rxh_next:
3259         ieee80211_rx_handlers_result(rx, res);
3260
3261 #undef CALL_RXH
3262 }
3263
3264 /*
3265  * This function makes calls into the RX path, therefore
3266  * it has to be invoked under RCU read lock.
3267  */
3268 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3269 {
3270         struct sk_buff_head frames;
3271         struct ieee80211_rx_data rx = {
3272                 .sta = sta,
3273                 .sdata = sta->sdata,
3274                 .local = sta->local,
3275                 /* This is OK -- must be QoS data frame */
3276                 .security_idx = tid,
3277                 .seqno_idx = tid,
3278                 .napi = NULL, /* must be NULL to not have races */
3279         };
3280         struct tid_ampdu_rx *tid_agg_rx;
3281
3282         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3283         if (!tid_agg_rx)
3284                 return;
3285
3286         __skb_queue_head_init(&frames);
3287
3288         spin_lock(&tid_agg_rx->reorder_lock);
3289         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3290         spin_unlock(&tid_agg_rx->reorder_lock);
3291
3292         if (!skb_queue_empty(&frames)) {
3293                 struct ieee80211_event event = {
3294                         .type = BA_FRAME_TIMEOUT,
3295                         .u.ba.tid = tid,
3296                         .u.ba.sta = &sta->sta,
3297                 };
3298                 drv_event_callback(rx.local, rx.sdata, &event);
3299         }
3300
3301         ieee80211_rx_handlers(&rx, &frames);
3302 }
3303
3304 /* main receive path */
3305
3306 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3307 {
3308         struct ieee80211_sub_if_data *sdata = rx->sdata;
3309         struct sk_buff *skb = rx->skb;
3310         struct ieee80211_hdr *hdr = (void *)skb->data;
3311         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3312         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3313         int multicast = is_multicast_ether_addr(hdr->addr1);
3314
3315         switch (sdata->vif.type) {
3316         case NL80211_IFTYPE_STATION:
3317                 if (!bssid && !sdata->u.mgd.use_4addr)
3318                         return false;
3319                 if (multicast)
3320                         return true;
3321                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3322         case NL80211_IFTYPE_ADHOC:
3323                 if (!bssid)
3324                         return false;
3325                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3326                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3327                         return false;
3328                 if (ieee80211_is_beacon(hdr->frame_control))
3329                         return true;
3330                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3331                         return false;
3332                 if (!multicast &&
3333                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3334                         return false;
3335                 if (!rx->sta) {
3336                         int rate_idx;
3337                         if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3338                                 rate_idx = 0; /* TODO: HT/VHT rates */
3339                         else
3340                                 rate_idx = status->rate_idx;
3341                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3342                                                  BIT(rate_idx));
3343                 }
3344                 return true;
3345         case NL80211_IFTYPE_OCB:
3346                 if (!bssid)
3347                         return false;
3348                 if (!ieee80211_is_data_present(hdr->frame_control))
3349                         return false;
3350                 if (!is_broadcast_ether_addr(bssid))
3351                         return false;
3352                 if (!multicast &&
3353                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3354                         return false;
3355                 if (!rx->sta) {
3356                         int rate_idx;
3357                         if (status->flag & RX_FLAG_HT)
3358                                 rate_idx = 0; /* TODO: HT rates */
3359                         else
3360                                 rate_idx = status->rate_idx;
3361                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3362                                                 BIT(rate_idx));
3363                 }
3364                 return true;
3365         case NL80211_IFTYPE_MESH_POINT:
3366                 if (multicast)
3367                         return true;
3368                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3369         case NL80211_IFTYPE_AP_VLAN:
3370         case NL80211_IFTYPE_AP:
3371                 if (!bssid)
3372                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3373
3374                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3375                         /*
3376                          * Accept public action frames even when the
3377                          * BSSID doesn't match, this is used for P2P
3378                          * and location updates. Note that mac80211
3379                          * itself never looks at these frames.
3380                          */
3381                         if (!multicast &&
3382                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3383                                 return false;
3384                         if (ieee80211_is_public_action(hdr, skb->len))
3385                                 return true;
3386                         return ieee80211_is_beacon(hdr->frame_control);
3387                 }
3388
3389                 if (!ieee80211_has_tods(hdr->frame_control)) {
3390                         /* ignore data frames to TDLS-peers */
3391                         if (ieee80211_is_data(hdr->frame_control))
3392                                 return false;
3393                         /* ignore action frames to TDLS-peers */
3394                         if (ieee80211_is_action(hdr->frame_control) &&
3395                             !is_broadcast_ether_addr(bssid) &&
3396                             !ether_addr_equal(bssid, hdr->addr1))
3397                                 return false;
3398                 }
3399                 return true;
3400         case NL80211_IFTYPE_WDS:
3401                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3402                         return false;
3403                 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3404         case NL80211_IFTYPE_P2P_DEVICE:
3405                 return ieee80211_is_public_action(hdr, skb->len) ||
3406                        ieee80211_is_probe_req(hdr->frame_control) ||
3407                        ieee80211_is_probe_resp(hdr->frame_control) ||
3408                        ieee80211_is_beacon(hdr->frame_control);
3409         default:
3410                 break;
3411         }
3412
3413         WARN_ON_ONCE(1);
3414         return false;
3415 }
3416
3417 /*
3418  * This function returns whether or not the SKB
3419  * was destined for RX processing or not, which,
3420  * if consume is true, is equivalent to whether
3421  * or not the skb was consumed.
3422  */
3423 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3424                                             struct sk_buff *skb, bool consume)
3425 {
3426         struct ieee80211_local *local = rx->local;
3427         struct ieee80211_sub_if_data *sdata = rx->sdata;
3428
3429         rx->skb = skb;
3430
3431         if (!ieee80211_accept_frame(rx))
3432                 return false;
3433
3434         if (!consume) {
3435                 skb = skb_copy(skb, GFP_ATOMIC);
3436                 if (!skb) {
3437                         if (net_ratelimit())
3438                                 wiphy_debug(local->hw.wiphy,
3439                                         "failed to copy skb for %s\n",
3440                                         sdata->name);
3441                         return true;
3442                 }
3443
3444                 rx->skb = skb;
3445         }
3446
3447         ieee80211_invoke_rx_handlers(rx);
3448         return true;
3449 }
3450
3451 /*
3452  * This is the actual Rx frames handler. as it belongs to Rx path it must
3453  * be called with rcu_read_lock protection.
3454  */
3455 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3456                                          struct sk_buff *skb,
3457                                          struct napi_struct *napi)
3458 {
3459         struct ieee80211_local *local = hw_to_local(hw);
3460         struct ieee80211_sub_if_data *sdata;
3461         struct ieee80211_hdr *hdr;
3462         __le16 fc;
3463         struct ieee80211_rx_data rx;
3464         struct ieee80211_sub_if_data *prev;
3465         struct sta_info *sta, *prev_sta;
3466         struct rhash_head *tmp;
3467         int err = 0;
3468
3469         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3470         memset(&rx, 0, sizeof(rx));
3471         rx.skb = skb;
3472         rx.local = local;
3473         rx.napi = napi;
3474
3475         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3476                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
3477
3478         if (ieee80211_is_mgmt(fc)) {
3479                 /* drop frame if too short for header */
3480                 if (skb->len < ieee80211_hdrlen(fc))
3481                         err = -ENOBUFS;
3482                 else
3483                         err = skb_linearize(skb);
3484         } else {
3485                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3486         }
3487
3488         if (err) {
3489                 dev_kfree_skb(skb);
3490                 return;
3491         }
3492
3493         hdr = (struct ieee80211_hdr *)skb->data;
3494         ieee80211_parse_qos(&rx);
3495         ieee80211_verify_alignment(&rx);
3496
3497         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3498                      ieee80211_is_beacon(hdr->frame_control)))
3499                 ieee80211_scan_rx(local, skb);
3500
3501         if (ieee80211_is_data(fc)) {
3502                 const struct bucket_table *tbl;
3503
3504                 prev_sta = NULL;
3505
3506                 tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
3507
3508                 for_each_sta_info(local, tbl, hdr->addr2, sta, tmp) {
3509                         if (!prev_sta) {
3510                                 prev_sta = sta;
3511                                 continue;
3512                         }
3513
3514                         rx.sta = prev_sta;
3515                         rx.sdata = prev_sta->sdata;
3516                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
3517
3518                         prev_sta = sta;
3519                 }
3520
3521                 if (prev_sta) {
3522                         rx.sta = prev_sta;
3523                         rx.sdata = prev_sta->sdata;
3524
3525                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3526                                 return;
3527                         goto out;
3528                 }
3529         }
3530
3531         prev = NULL;
3532
3533         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3534                 if (!ieee80211_sdata_running(sdata))
3535                         continue;
3536
3537                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3538                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3539                         continue;
3540
3541                 /*
3542                  * frame is destined for this interface, but if it's
3543                  * not also for the previous one we handle that after
3544                  * the loop to avoid copying the SKB once too much
3545                  */
3546
3547                 if (!prev) {
3548                         prev = sdata;
3549                         continue;
3550                 }
3551
3552                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3553                 rx.sdata = prev;
3554                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3555
3556                 prev = sdata;
3557         }
3558
3559         if (prev) {
3560                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3561                 rx.sdata = prev;
3562
3563                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3564                         return;
3565         }
3566
3567  out:
3568         dev_kfree_skb(skb);
3569 }
3570
3571 /*
3572  * This is the receive path handler. It is called by a low level driver when an
3573  * 802.11 MPDU is received from the hardware.
3574  */
3575 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct sk_buff *skb,
3576                        struct napi_struct *napi)
3577 {
3578         struct ieee80211_local *local = hw_to_local(hw);
3579         struct ieee80211_rate *rate = NULL;
3580         struct ieee80211_supported_band *sband;
3581         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3582
3583         WARN_ON_ONCE_NONRT(softirq_count() == 0);
3584
3585         if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3586                 goto drop;
3587
3588         sband = local->hw.wiphy->bands[status->band];
3589         if (WARN_ON(!sband))
3590                 goto drop;
3591
3592         /*
3593          * If we're suspending, it is possible although not too likely
3594          * that we'd be receiving frames after having already partially
3595          * quiesced the stack. We can't process such frames then since
3596          * that might, for example, cause stations to be added or other
3597          * driver callbacks be invoked.
3598          */
3599         if (unlikely(local->quiescing || local->suspended))
3600                 goto drop;
3601
3602         /* We might be during a HW reconfig, prevent Rx for the same reason */
3603         if (unlikely(local->in_reconfig))
3604                 goto drop;
3605
3606         /*
3607          * The same happens when we're not even started,
3608          * but that's worth a warning.
3609          */
3610         if (WARN_ON(!local->started))
3611                 goto drop;
3612
3613         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3614                 /*
3615                  * Validate the rate, unless a PLCP error means that
3616                  * we probably can't have a valid rate here anyway.
3617                  */
3618
3619                 if (status->flag & RX_FLAG_HT) {
3620                         /*
3621                          * rate_idx is MCS index, which can be [0-76]
3622                          * as documented on:
3623                          *
3624                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3625                          *
3626                          * Anything else would be some sort of driver or
3627                          * hardware error. The driver should catch hardware
3628                          * errors.
3629                          */
3630                         if (WARN(status->rate_idx > 76,
3631                                  "Rate marked as an HT rate but passed "
3632                                  "status->rate_idx is not "
3633                                  "an MCS index [0-76]: %d (0x%02x)\n",
3634                                  status->rate_idx,
3635                                  status->rate_idx))
3636                                 goto drop;
3637                 } else if (status->flag & RX_FLAG_VHT) {
3638                         if (WARN_ONCE(status->rate_idx > 9 ||
3639                                       !status->vht_nss ||
3640                                       status->vht_nss > 8,
3641                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3642                                       status->rate_idx, status->vht_nss))
3643                                 goto drop;
3644                 } else {
3645                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3646                                 goto drop;
3647                         rate = &sband->bitrates[status->rate_idx];
3648                 }
3649         }
3650
3651         status->rx_flags = 0;
3652
3653         /*
3654          * key references and virtual interfaces are protected using RCU
3655          * and this requires that we are in a read-side RCU section during
3656          * receive processing
3657          */
3658         rcu_read_lock();
3659
3660         /*
3661          * Frames with failed FCS/PLCP checksum are not returned,
3662          * all other frames are returned without radiotap header
3663          * if it was previously present.
3664          * Also, frames with less than 16 bytes are dropped.
3665          */
3666         skb = ieee80211_rx_monitor(local, skb, rate);
3667         if (!skb) {
3668                 rcu_read_unlock();
3669                 return;
3670         }
3671
3672         ieee80211_tpt_led_trig_rx(local,
3673                         ((struct ieee80211_hdr *)skb->data)->frame_control,
3674                         skb->len);
3675         __ieee80211_rx_handle_packet(hw, skb, napi);
3676
3677         rcu_read_unlock();
3678
3679         return;
3680  drop:
3681         kfree_skb(skb);
3682 }
3683 EXPORT_SYMBOL(ieee80211_rx_napi);
3684
3685 /* This is a version of the rx handler that can be called from hard irq
3686  * context. Post the skb on the queue and schedule the tasklet */
3687 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3688 {
3689         struct ieee80211_local *local = hw_to_local(hw);
3690
3691         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3692
3693         skb->pkt_type = IEEE80211_RX_MSG;
3694         skb_queue_tail(&local->skb_queue, skb);
3695         tasklet_schedule(&local->tasklet);
3696 }
3697 EXPORT_SYMBOL(ieee80211_rx_irqsafe);