linux/net/mac80211/rx.c
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   1/*
   2 * Copyright 2002-2005, Instant802 Networks, Inc.
   3 * Copyright 2005-2006, Devicescape Software, Inc.
   4 * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5 * Copyright 2007-2010  Johannes Berg <johannes@sipsolutions.net>
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License version 2 as
   9 * published by the Free Software Foundation.
  10 */
  11
  12#include <linux/jiffies.h>
  13#include <linux/slab.h>
  14#include <linux/kernel.h>
  15#include <linux/skbuff.h>
  16#include <linux/netdevice.h>
  17#include <linux/etherdevice.h>
  18#include <linux/rcupdate.h>
  19#include <linux/export.h>
  20#include <net/mac80211.h>
  21#include <net/ieee80211_radiotap.h>
  22#include <asm/unaligned.h>
  23
  24#include "ieee80211_i.h"
  25#include "driver-ops.h"
  26#include "led.h"
  27#include "mesh.h"
  28#include "wep.h"
  29#include "wpa.h"
  30#include "tkip.h"
  31#include "wme.h"
  32#include "rate.h"
  33
  34/*
  35 * monitor mode reception
  36 *
  37 * This function cleans up the SKB, i.e. it removes all the stuff
  38 * only useful for monitoring.
  39 */
  40static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
  41                                           struct sk_buff *skb)
  42{
  43        if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
  44                if (likely(skb->len > FCS_LEN))
  45                        __pskb_trim(skb, skb->len - FCS_LEN);
  46                else {
  47                        /* driver bug */
  48                        WARN_ON(1);
  49                        dev_kfree_skb(skb);
  50                        skb = NULL;
  51                }
  52        }
  53
  54        return skb;
  55}
  56
  57static inline int should_drop_frame(struct sk_buff *skb,
  58                                    int present_fcs_len)
  59{
  60        struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
  61        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
  62
  63        if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
  64                            RX_FLAG_FAILED_PLCP_CRC |
  65                            RX_FLAG_AMPDU_IS_ZEROLEN))
  66                return 1;
  67        if (unlikely(skb->len < 16 + present_fcs_len))
  68                return 1;
  69        if (ieee80211_is_ctl(hdr->frame_control) &&
  70            !ieee80211_is_pspoll(hdr->frame_control) &&
  71            !ieee80211_is_back_req(hdr->frame_control))
  72                return 1;
  73        return 0;
  74}
  75
  76static int
  77ieee80211_rx_radiotap_len(struct ieee80211_local *local,
  78                          struct ieee80211_rx_status *status)
  79{
  80        int len;
  81
  82        /* always present fields */
  83        len = sizeof(struct ieee80211_radiotap_header) + 9;
  84
  85        if (status->flag & RX_FLAG_MACTIME_MPDU)
  86                len += 8;
  87        if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
  88                len += 1;
  89
  90        if (len & 1) /* padding for RX_FLAGS if necessary */
  91                len++;
  92
  93        if (status->flag & RX_FLAG_HT) /* HT info */
  94                len += 3;
  95
  96        if (status->flag & RX_FLAG_AMPDU_DETAILS) {
  97                /* padding */
  98                while (len & 3)
  99                        len++;
 100                len += 8;
 101        }
 102
 103        return len;
 104}
 105
 106/*
 107 * ieee80211_add_rx_radiotap_header - add radiotap header
 108 *
 109 * add a radiotap header containing all the fields which the hardware provided.
 110 */
 111static void
 112ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 113                                 struct sk_buff *skb,
 114                                 struct ieee80211_rate *rate,
 115                                 int rtap_len, bool has_fcs)
 116{
 117        struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 118        struct ieee80211_radiotap_header *rthdr;
 119        unsigned char *pos;
 120        u16 rx_flags = 0;
 121
 122        rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
 123        memset(rthdr, 0, rtap_len);
 124
 125        /* radiotap header, set always present flags */
 126        rthdr->it_present =
 127                cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
 128                            (1 << IEEE80211_RADIOTAP_CHANNEL) |
 129                            (1 << IEEE80211_RADIOTAP_ANTENNA) |
 130                            (1 << IEEE80211_RADIOTAP_RX_FLAGS));
 131        rthdr->it_len = cpu_to_le16(rtap_len);
 132
 133        pos = (unsigned char *)(rthdr+1);
 134
 135        /* the order of the following fields is important */
 136
 137        /* IEEE80211_RADIOTAP_TSFT */
 138        if (status->flag & RX_FLAG_MACTIME_MPDU) {
 139                put_unaligned_le64(status->mactime, pos);
 140                rthdr->it_present |=
 141                        cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 142                pos += 8;
 143        }
 144
 145        /* IEEE80211_RADIOTAP_FLAGS */
 146        if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
 147                *pos |= IEEE80211_RADIOTAP_F_FCS;
 148        if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 149                *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 150        if (status->flag & RX_FLAG_SHORTPRE)
 151                *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 152        pos++;
 153
 154        /* IEEE80211_RADIOTAP_RATE */
 155        if (!rate || status->flag & RX_FLAG_HT) {
 156                /*
 157                 * Without rate information don't add it. If we have,
 158                 * MCS information is a separate field in radiotap,
 159                 * added below. The byte here is needed as padding
 160                 * for the channel though, so initialise it to 0.
 161                 */
 162                *pos = 0;
 163        } else {
 164                rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 165                *pos = rate->bitrate / 5;
 166        }
 167        pos++;
 168
 169        /* IEEE80211_RADIOTAP_CHANNEL */
 170        put_unaligned_le16(status->freq, pos);
 171        pos += 2;
 172        if (status->band == IEEE80211_BAND_5GHZ)
 173                put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
 174                                   pos);
 175        else if (status->flag & RX_FLAG_HT)
 176                put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
 177                                   pos);
 178        else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 179                put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
 180                                   pos);
 181        else if (rate)
 182                put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
 183                                   pos);
 184        else
 185                put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
 186        pos += 2;
 187
 188        /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 189        if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
 190            !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 191                *pos = status->signal;
 192                rthdr->it_present |=
 193                        cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 194                pos++;
 195        }
 196
 197        /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 198
 199        /* IEEE80211_RADIOTAP_ANTENNA */
 200        *pos = status->antenna;
 201        pos++;
 202
 203        /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 204
 205        /* IEEE80211_RADIOTAP_RX_FLAGS */
 206        /* ensure 2 byte alignment for the 2 byte field as required */
 207        if ((pos - (u8 *)rthdr) & 1)
 208                pos++;
 209        if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 210                rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 211        put_unaligned_le16(rx_flags, pos);
 212        pos += 2;
 213
 214        if (status->flag & RX_FLAG_HT) {
 215                rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 216                *pos++ = local->hw.radiotap_mcs_details;
 217                *pos = 0;
 218                if (status->flag & RX_FLAG_SHORT_GI)
 219                        *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 220                if (status->flag & RX_FLAG_40MHZ)
 221                        *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 222                if (status->flag & RX_FLAG_HT_GF)
 223                        *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 224                pos++;
 225                *pos++ = status->rate_idx;
 226        }
 227
 228        if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 229                u16 flags = 0;
 230
 231                /* ensure 4 byte alignment */
 232                while ((pos - (u8 *)rthdr) & 3)
 233                        pos++;
 234                rthdr->it_present |=
 235                        cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 236                put_unaligned_le32(status->ampdu_reference, pos);
 237                pos += 4;
 238                if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
 239                        flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
 240                if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
 241                        flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
 242                if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 243                        flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 244                if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 245                        flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 246                if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 247                        flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 248                if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 249                        flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 250                put_unaligned_le16(flags, pos);
 251                pos += 2;
 252                if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 253                        *pos++ = status->ampdu_delimiter_crc;
 254                else
 255                        *pos++ = 0;
 256                *pos++ = 0;
 257        }
 258}
 259
 260/*
 261 * This function copies a received frame to all monitor interfaces and
 262 * returns a cleaned-up SKB that no longer includes the FCS nor the
 263 * radiotap header the driver might have added.
 264 */
 265static struct sk_buff *
 266ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 267                     struct ieee80211_rate *rate)
 268{
 269        struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 270        struct ieee80211_sub_if_data *sdata;
 271        int needed_headroom;
 272        struct sk_buff *skb, *skb2;
 273        struct net_device *prev_dev = NULL;
 274        int present_fcs_len = 0;
 275
 276        /*
 277         * First, we may need to make a copy of the skb because
 278         *  (1) we need to modify it for radiotap (if not present), and
 279         *  (2) the other RX handlers will modify the skb we got.
 280         *
 281         * We don't need to, of course, if we aren't going to return
 282         * the SKB because it has a bad FCS/PLCP checksum.
 283         */
 284
 285        /* room for the radiotap header based on driver features */
 286        needed_headroom = ieee80211_rx_radiotap_len(local, status);
 287
 288        if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
 289                present_fcs_len = FCS_LEN;
 290
 291        /* make sure hdr->frame_control is on the linear part */
 292        if (!pskb_may_pull(origskb, 2)) {
 293                dev_kfree_skb(origskb);
 294                return NULL;
 295        }
 296
 297        if (!local->monitors) {
 298                if (should_drop_frame(origskb, present_fcs_len)) {
 299                        dev_kfree_skb(origskb);
 300                        return NULL;
 301                }
 302
 303                return remove_monitor_info(local, origskb);
 304        }
 305
 306        if (should_drop_frame(origskb, present_fcs_len)) {
 307                /* only need to expand headroom if necessary */
 308                skb = origskb;
 309                origskb = NULL;
 310
 311                /*
 312                 * This shouldn't trigger often because most devices have an
 313                 * RX header they pull before we get here, and that should
 314                 * be big enough for our radiotap information. We should
 315                 * probably export the length to drivers so that we can have
 316                 * them allocate enough headroom to start with.
 317                 */
 318                if (skb_headroom(skb) < needed_headroom &&
 319                    pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 320                        dev_kfree_skb(skb);
 321                        return NULL;
 322                }
 323        } else {
 324                /*
 325                 * Need to make a copy and possibly remove radiotap header
 326                 * and FCS from the original.
 327                 */
 328                skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
 329
 330                origskb = remove_monitor_info(local, origskb);
 331
 332                if (!skb)
 333                        return origskb;
 334        }
 335
 336        /* prepend radiotap information */
 337        ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
 338                                         true);
 339
 340        skb_reset_mac_header(skb);
 341        skb->ip_summed = CHECKSUM_UNNECESSARY;
 342        skb->pkt_type = PACKET_OTHERHOST;
 343        skb->protocol = htons(ETH_P_802_2);
 344
 345        list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 346                if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
 347                        continue;
 348
 349                if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
 350                        continue;
 351
 352                if (!ieee80211_sdata_running(sdata))
 353                        continue;
 354
 355                if (prev_dev) {
 356                        skb2 = skb_clone(skb, GFP_ATOMIC);
 357                        if (skb2) {
 358                                skb2->dev = prev_dev;
 359                                netif_receive_skb(skb2);
 360                        }
 361                }
 362
 363                prev_dev = sdata->dev;
 364                sdata->dev->stats.rx_packets++;
 365                sdata->dev->stats.rx_bytes += skb->len;
 366        }
 367
 368        if (prev_dev) {
 369                skb->dev = prev_dev;
 370                netif_receive_skb(skb);
 371        } else
 372                dev_kfree_skb(skb);
 373
 374        return origskb;
 375}
 376
 377
 378static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 379{
 380        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 381        struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 382        int tid, seqno_idx, security_idx;
 383
 384        /* does the frame have a qos control field? */
 385        if (ieee80211_is_data_qos(hdr->frame_control)) {
 386                u8 *qc = ieee80211_get_qos_ctl(hdr);
 387                /* frame has qos control */
 388                tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 389                if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 390                        status->rx_flags |= IEEE80211_RX_AMSDU;
 391
 392                seqno_idx = tid;
 393                security_idx = tid;
 394        } else {
 395                /*
 396                 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 397                 *
 398                 *      Sequence numbers for management frames, QoS data
 399                 *      frames with a broadcast/multicast address in the
 400                 *      Address 1 field, and all non-QoS data frames sent
 401                 *      by QoS STAs are assigned using an additional single
 402                 *      modulo-4096 counter, [...]
 403                 *
 404                 * We also use that counter for non-QoS STAs.
 405                 */
 406                seqno_idx = NUM_RX_DATA_QUEUES;
 407                security_idx = 0;
 408                if (ieee80211_is_mgmt(hdr->frame_control))
 409                        security_idx = NUM_RX_DATA_QUEUES;
 410                tid = 0;
 411        }
 412
 413        rx->seqno_idx = seqno_idx;
 414        rx->security_idx = security_idx;
 415        /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 416         * For now, set skb->priority to 0 for other cases. */
 417        rx->skb->priority = (tid > 7) ? 0 : tid;
 418}
 419
 420/**
 421 * DOC: Packet alignment
 422 *
 423 * Drivers always need to pass packets that are aligned to two-byte boundaries
 424 * to the stack.
 425 *
 426 * Additionally, should, if possible, align the payload data in a way that
 427 * guarantees that the contained IP header is aligned to a four-byte
 428 * boundary. In the case of regular frames, this simply means aligning the
 429 * payload to a four-byte boundary (because either the IP header is directly
 430 * contained, or IV/RFC1042 headers that have a length divisible by four are
 431 * in front of it).  If the payload data is not properly aligned and the
 432 * architecture doesn't support efficient unaligned operations, mac80211
 433 * will align the data.
 434 *
 435 * With A-MSDU frames, however, the payload data address must yield two modulo
 436 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 437 * push the IP header further back to a multiple of four again. Thankfully, the
 438 * specs were sane enough this time around to require padding each A-MSDU
 439 * subframe to a length that is a multiple of four.
 440 *
 441 * Padding like Atheros hardware adds which is between the 802.11 header and
 442 * the payload is not supported, the driver is required to move the 802.11
 443 * header to be directly in front of the payload in that case.
 444 */
 445static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 446{
 447#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 448        WARN_ONCE((unsigned long)rx->skb->data & 1,
 449                  "unaligned packet at 0x%p\n", rx->skb->data);
 450#endif
 451}
 452
 453
 454/* rx handlers */
 455
 456static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 457{
 458        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 459
 460        if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
 461                return 0;
 462
 463        return ieee80211_is_robust_mgmt_frame(hdr);
 464}
 465
 466
 467static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 468{
 469        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 470
 471        if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
 472                return 0;
 473
 474        return ieee80211_is_robust_mgmt_frame(hdr);
 475}
 476
 477
 478/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 479static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 480{
 481        struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 482        struct ieee80211_mmie *mmie;
 483
 484        if (skb->len < 24 + sizeof(*mmie) ||
 485            !is_multicast_ether_addr(hdr->da))
 486                return -1;
 487
 488        if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
 489                return -1; /* not a robust management frame */
 490
 491        mmie = (struct ieee80211_mmie *)
 492                (skb->data + skb->len - sizeof(*mmie));
 493        if (mmie->element_id != WLAN_EID_MMIE ||
 494            mmie->length != sizeof(*mmie) - 2)
 495                return -1;
 496
 497        return le16_to_cpu(mmie->key_id);
 498}
 499
 500
 501static ieee80211_rx_result
 502ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
 503{
 504        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 505        char *dev_addr = rx->sdata->vif.addr;
 506
 507        if (ieee80211_is_data(hdr->frame_control)) {
 508                if (is_multicast_ether_addr(hdr->addr1)) {
 509                        if (ieee80211_has_tods(hdr->frame_control) ||
 510                                !ieee80211_has_fromds(hdr->frame_control))
 511                                return RX_DROP_MONITOR;
 512                        if (ether_addr_equal(hdr->addr3, dev_addr))
 513                                return RX_DROP_MONITOR;
 514                } else {
 515                        if (!ieee80211_has_a4(hdr->frame_control))
 516                                return RX_DROP_MONITOR;
 517                        if (ether_addr_equal(hdr->addr4, dev_addr))
 518                                return RX_DROP_MONITOR;
 519                }
 520        }
 521
 522        /* If there is not an established peer link and this is not a peer link
 523         * establisment frame, beacon or probe, drop the frame.
 524         */
 525
 526        if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
 527                struct ieee80211_mgmt *mgmt;
 528
 529                if (!ieee80211_is_mgmt(hdr->frame_control))
 530                        return RX_DROP_MONITOR;
 531
 532                if (ieee80211_is_action(hdr->frame_control)) {
 533                        u8 category;
 534
 535                        /* make sure category field is present */
 536                        if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
 537                                return RX_DROP_MONITOR;
 538
 539                        mgmt = (struct ieee80211_mgmt *)hdr;
 540                        category = mgmt->u.action.category;
 541                        if (category != WLAN_CATEGORY_MESH_ACTION &&
 542                                category != WLAN_CATEGORY_SELF_PROTECTED)
 543                                return RX_DROP_MONITOR;
 544                        return RX_CONTINUE;
 545                }
 546
 547                if (ieee80211_is_probe_req(hdr->frame_control) ||
 548                    ieee80211_is_probe_resp(hdr->frame_control) ||
 549                    ieee80211_is_beacon(hdr->frame_control) ||
 550                    ieee80211_is_auth(hdr->frame_control))
 551                        return RX_CONTINUE;
 552
 553                return RX_DROP_MONITOR;
 554
 555        }
 556
 557        return RX_CONTINUE;
 558}
 559
 560#define SEQ_MODULO 0x1000
 561#define SEQ_MASK   0xfff
 562
 563static inline int seq_less(u16 sq1, u16 sq2)
 564{
 565        return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
 566}
 567
 568static inline u16 seq_inc(u16 sq)
 569{
 570        return (sq + 1) & SEQ_MASK;
 571}
 572
 573static inline u16 seq_sub(u16 sq1, u16 sq2)
 574{
 575        return (sq1 - sq2) & SEQ_MASK;
 576}
 577
 578
 579static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
 580                                            struct tid_ampdu_rx *tid_agg_rx,
 581                                            int index)
 582{
 583        struct ieee80211_local *local = sdata->local;
 584        struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
 585        struct ieee80211_rx_status *status;
 586
 587        lockdep_assert_held(&tid_agg_rx->reorder_lock);
 588
 589        if (!skb)
 590                goto no_frame;
 591
 592        /* release the frame from the reorder ring buffer */
 593        tid_agg_rx->stored_mpdu_num--;
 594        tid_agg_rx->reorder_buf[index] = NULL;
 595        status = IEEE80211_SKB_RXCB(skb);
 596        status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
 597        skb_queue_tail(&local->rx_skb_queue, skb);
 598
 599no_frame:
 600        tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
 601}
 602
 603static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
 604                                             struct tid_ampdu_rx *tid_agg_rx,
 605                                             u16 head_seq_num)
 606{
 607        int index;
 608
 609        lockdep_assert_held(&tid_agg_rx->reorder_lock);
 610
 611        while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
 612                index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
 613                                                        tid_agg_rx->buf_size;
 614                ieee80211_release_reorder_frame(sdata, tid_agg_rx, index);
 615        }
 616}
 617
 618/*
 619 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
 620 * the skb was added to the buffer longer than this time ago, the earlier
 621 * frames that have not yet been received are assumed to be lost and the skb
 622 * can be released for processing. This may also release other skb's from the
 623 * reorder buffer if there are no additional gaps between the frames.
 624 *
 625 * Callers must hold tid_agg_rx->reorder_lock.
 626 */
 627#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
 628
 629static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
 630                                          struct tid_ampdu_rx *tid_agg_rx)
 631{
 632        int index, j;
 633
 634        lockdep_assert_held(&tid_agg_rx->reorder_lock);
 635
 636        /* release the buffer until next missing frame */
 637        index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
 638                                                tid_agg_rx->buf_size;
 639        if (!tid_agg_rx->reorder_buf[index] &&
 640            tid_agg_rx->stored_mpdu_num) {
 641                /*
 642                 * No buffers ready to be released, but check whether any
 643                 * frames in the reorder buffer have timed out.
 644                 */
 645                int skipped = 1;
 646                for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
 647                     j = (j + 1) % tid_agg_rx->buf_size) {
 648                        if (!tid_agg_rx->reorder_buf[j]) {
 649                                skipped++;
 650                                continue;
 651                        }
 652                        if (skipped &&
 653                            !time_after(jiffies, tid_agg_rx->reorder_time[j] +
 654                                        HT_RX_REORDER_BUF_TIMEOUT))
 655                                goto set_release_timer;
 656
 657                        ht_dbg_ratelimited(sdata,
 658                                           "release an RX reorder frame due to timeout on earlier frames\n");
 659                        ieee80211_release_reorder_frame(sdata, tid_agg_rx, j);
 660
 661                        /*
 662                         * Increment the head seq# also for the skipped slots.
 663                         */
 664                        tid_agg_rx->head_seq_num =
 665                                (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
 666                        skipped = 0;
 667                }
 668        } else while (tid_agg_rx->reorder_buf[index]) {
 669                ieee80211_release_reorder_frame(sdata, tid_agg_rx, index);
 670                index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
 671                                                        tid_agg_rx->buf_size;
 672        }
 673
 674        if (tid_agg_rx->stored_mpdu_num) {
 675                j = index = seq_sub(tid_agg_rx->head_seq_num,
 676                                    tid_agg_rx->ssn) % tid_agg_rx->buf_size;
 677
 678                for (; j != (index - 1) % tid_agg_rx->buf_size;
 679                     j = (j + 1) % tid_agg_rx->buf_size) {
 680                        if (tid_agg_rx->reorder_buf[j])
 681                                break;
 682                }
 683
 684 set_release_timer:
 685
 686                mod_timer(&tid_agg_rx->reorder_timer,
 687                          tid_agg_rx->reorder_time[j] + 1 +
 688                          HT_RX_REORDER_BUF_TIMEOUT);
 689        } else {
 690                del_timer(&tid_agg_rx->reorder_timer);
 691        }
 692}
 693
 694/*
 695 * As this function belongs to the RX path it must be under
 696 * rcu_read_lock protection. It returns false if the frame
 697 * can be processed immediately, true if it was consumed.
 698 */
 699static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
 700                                             struct tid_ampdu_rx *tid_agg_rx,
 701                                             struct sk_buff *skb)
 702{
 703        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 704        u16 sc = le16_to_cpu(hdr->seq_ctrl);
 705        u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
 706        u16 head_seq_num, buf_size;
 707        int index;
 708        bool ret = true;
 709
 710        spin_lock(&tid_agg_rx->reorder_lock);
 711
 712        buf_size = tid_agg_rx->buf_size;
 713        head_seq_num = tid_agg_rx->head_seq_num;
 714
 715        /* frame with out of date sequence number */
 716        if (seq_less(mpdu_seq_num, head_seq_num)) {
 717                dev_kfree_skb(skb);
 718                goto out;
 719        }
 720
 721        /*
 722         * If frame the sequence number exceeds our buffering window
 723         * size release some previous frames to make room for this one.
 724         */
 725        if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
 726                head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
 727                /* release stored frames up to new head to stack */
 728                ieee80211_release_reorder_frames(sdata, tid_agg_rx,
 729                                                 head_seq_num);
 730        }
 731
 732        /* Now the new frame is always in the range of the reordering buffer */
 733
 734        index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
 735
 736        /* check if we already stored this frame */
 737        if (tid_agg_rx->reorder_buf[index]) {
 738                dev_kfree_skb(skb);
 739                goto out;
 740        }
 741
 742        /*
 743         * If the current MPDU is in the right order and nothing else
 744         * is stored we can process it directly, no need to buffer it.
 745         * If it is first but there's something stored, we may be able
 746         * to release frames after this one.
 747         */
 748        if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
 749            tid_agg_rx->stored_mpdu_num == 0) {
 750                tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
 751                ret = false;
 752                goto out;
 753        }
 754
 755        /* put the frame in the reordering buffer */
 756        tid_agg_rx->reorder_buf[index] = skb;
 757        tid_agg_rx->reorder_time[index] = jiffies;
 758        tid_agg_rx->stored_mpdu_num++;
 759        ieee80211_sta_reorder_release(sdata, tid_agg_rx);
 760
 761 out:
 762        spin_unlock(&tid_agg_rx->reorder_lock);
 763        return ret;
 764}
 765
 766/*
 767 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
 768 * true if the MPDU was buffered, false if it should be processed.
 769 */
 770static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
 771{
 772        struct sk_buff *skb = rx->skb;
 773        struct ieee80211_local *local = rx->local;
 774        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 775        struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 776        struct sta_info *sta = rx->sta;
 777        struct tid_ampdu_rx *tid_agg_rx;
 778        u16 sc;
 779        u8 tid, ack_policy;
 780
 781        if (!ieee80211_is_data_qos(hdr->frame_control))
 782                goto dont_reorder;
 783
 784        /*
 785         * filter the QoS data rx stream according to
 786         * STA/TID and check if this STA/TID is on aggregation
 787         */
 788
 789        if (!sta)
 790                goto dont_reorder;
 791
 792        ack_policy = *ieee80211_get_qos_ctl(hdr) &
 793                     IEEE80211_QOS_CTL_ACK_POLICY_MASK;
 794        tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
 795
 796        tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
 797        if (!tid_agg_rx)
 798                goto dont_reorder;
 799
 800        /* qos null data frames are excluded */
 801        if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
 802                goto dont_reorder;
 803
 804        /* not part of a BA session */
 805        if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
 806            ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
 807                goto dont_reorder;
 808
 809        /* not actually part of this BA session */
 810        if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
 811                goto dont_reorder;
 812
 813        /* new, potentially un-ordered, ampdu frame - process it */
 814
 815        /* reset session timer */
 816        if (tid_agg_rx->timeout)
 817                tid_agg_rx->last_rx = jiffies;
 818
 819        /* if this mpdu is fragmented - terminate rx aggregation session */
 820        sc = le16_to_cpu(hdr->seq_ctrl);
 821        if (sc & IEEE80211_SCTL_FRAG) {
 822                skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
 823                skb_queue_tail(&rx->sdata->skb_queue, skb);
 824                ieee80211_queue_work(&local->hw, &rx->sdata->work);
 825                return;
 826        }
 827
 828        /*
 829         * No locking needed -- we will only ever process one
 830         * RX packet at a time, and thus own tid_agg_rx. All
 831         * other code manipulating it needs to (and does) make
 832         * sure that we cannot get to it any more before doing
 833         * anything with it.
 834         */
 835        if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb))
 836                return;
 837
 838 dont_reorder:
 839        skb_queue_tail(&local->rx_skb_queue, skb);
 840}
 841
 842static ieee80211_rx_result debug_noinline
 843ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
 844{
 845        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 846        struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 847
 848        /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
 849        if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
 850                if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
 851                             rx->sta->last_seq_ctrl[rx->seqno_idx] ==
 852                             hdr->seq_ctrl)) {
 853                        if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
 854                                rx->local->dot11FrameDuplicateCount++;
 855                                rx->sta->num_duplicates++;
 856                        }
 857                        return RX_DROP_UNUSABLE;
 858                } else
 859                        rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
 860        }
 861
 862        if (unlikely(rx->skb->len < 16)) {
 863                I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
 864                return RX_DROP_MONITOR;
 865        }
 866
 867        /* Drop disallowed frame classes based on STA auth/assoc state;
 868         * IEEE 802.11, Chap 5.5.
 869         *
 870         * mac80211 filters only based on association state, i.e. it drops
 871         * Class 3 frames from not associated stations. hostapd sends
 872         * deauth/disassoc frames when needed. In addition, hostapd is
 873         * responsible for filtering on both auth and assoc states.
 874         */
 875
 876        if (ieee80211_vif_is_mesh(&rx->sdata->vif))
 877                return ieee80211_rx_mesh_check(rx);
 878
 879        if (unlikely((ieee80211_is_data(hdr->frame_control) ||
 880                      ieee80211_is_pspoll(hdr->frame_control)) &&
 881                     rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
 882                     rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
 883                     (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
 884                /*
 885                 * accept port control frames from the AP even when it's not
 886                 * yet marked ASSOC to prevent a race where we don't set the
 887                 * assoc bit quickly enough before it sends the first frame
 888                 */
 889                if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
 890                    ieee80211_is_data_present(hdr->frame_control)) {
 891                        unsigned int hdrlen;
 892                        __be16 ethertype;
 893
 894                        hdrlen = ieee80211_hdrlen(hdr->frame_control);
 895
 896                        if (rx->skb->len < hdrlen + 8)
 897                                return RX_DROP_MONITOR;
 898
 899                        skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
 900                        if (ethertype == rx->sdata->control_port_protocol)
 901                                return RX_CONTINUE;
 902                }
 903
 904                if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
 905                    cfg80211_rx_spurious_frame(rx->sdata->dev,
 906                                               hdr->addr2,
 907                                               GFP_ATOMIC))
 908                        return RX_DROP_UNUSABLE;
 909
 910                return RX_DROP_MONITOR;
 911        }
 912
 913        return RX_CONTINUE;
 914}
 915
 916
 917static ieee80211_rx_result debug_noinline
 918ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
 919{
 920        struct sk_buff *skb = rx->skb;
 921        struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 922        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 923        int keyidx;
 924        int hdrlen;
 925        ieee80211_rx_result result = RX_DROP_UNUSABLE;
 926        struct ieee80211_key *sta_ptk = NULL;
 927        int mmie_keyidx = -1;
 928        __le16 fc;
 929
 930        /*
 931         * Key selection 101
 932         *
 933         * There are four types of keys:
 934         *  - GTK (group keys)
 935         *  - IGTK (group keys for management frames)
 936         *  - PTK (pairwise keys)
 937         *  - STK (station-to-station pairwise keys)
 938         *
 939         * When selecting a key, we have to distinguish between multicast
 940         * (including broadcast) and unicast frames, the latter can only
 941         * use PTKs and STKs while the former always use GTKs and IGTKs.
 942         * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
 943         * unicast frames can also use key indices like GTKs. Hence, if we
 944         * don't have a PTK/STK we check the key index for a WEP key.
 945         *
 946         * Note that in a regular BSS, multicast frames are sent by the
 947         * AP only, associated stations unicast the frame to the AP first
 948         * which then multicasts it on their behalf.
 949         *
 950         * There is also a slight problem in IBSS mode: GTKs are negotiated
 951         * with each station, that is something we don't currently handle.
 952         * The spec seems to expect that one negotiates the same key with
 953         * every station but there's no such requirement; VLANs could be
 954         * possible.
 955         */
 956
 957        /*
 958         * No point in finding a key and decrypting if the frame is neither
 959         * addressed to us nor a multicast frame.
 960         */
 961        if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
 962                return RX_CONTINUE;
 963
 964        /* start without a key */
 965        rx->key = NULL;
 966
 967        if (rx->sta)
 968                sta_ptk = rcu_dereference(rx->sta->ptk);
 969
 970        fc = hdr->frame_control;
 971
 972        if (!ieee80211_has_protected(fc))
 973                mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
 974
 975        if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
 976                rx->key = sta_ptk;
 977                if ((status->flag & RX_FLAG_DECRYPTED) &&
 978                    (status->flag & RX_FLAG_IV_STRIPPED))
 979                        return RX_CONTINUE;
 980                /* Skip decryption if the frame is not protected. */
 981                if (!ieee80211_has_protected(fc))
 982                        return RX_CONTINUE;
 983        } else if (mmie_keyidx >= 0) {
 984                /* Broadcast/multicast robust management frame / BIP */
 985                if ((status->flag & RX_FLAG_DECRYPTED) &&
 986                    (status->flag & RX_FLAG_IV_STRIPPED))
 987                        return RX_CONTINUE;
 988
 989                if (mmie_keyidx < NUM_DEFAULT_KEYS ||
 990                    mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
 991                        return RX_DROP_MONITOR; /* unexpected BIP keyidx */
 992                if (rx->sta)
 993                        rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
 994                if (!rx->key)
 995                        rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
 996        } else if (!ieee80211_has_protected(fc)) {
 997                /*
 998                 * The frame was not protected, so skip decryption. However, we
 999                 * need to set rx->key if there is a key that could have been
1000                 * used so that the frame may be dropped if encryption would
1001                 * have been expected.
1002                 */
1003                struct ieee80211_key *key = NULL;
1004                struct ieee80211_sub_if_data *sdata = rx->sdata;
1005                int i;
1006
1007                if (ieee80211_is_mgmt(fc) &&
1008                    is_multicast_ether_addr(hdr->addr1) &&
1009                    (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1010                        rx->key = key;
1011                else {
1012                        if (rx->sta) {
1013                                for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1014                                        key = rcu_dereference(rx->sta->gtk[i]);
1015                                        if (key)
1016                                                break;
1017                                }
1018                        }
1019                        if (!key) {
1020                                for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1021                                        key = rcu_dereference(sdata->keys[i]);
1022                                        if (key)
1023                                                break;
1024                                }
1025                        }
1026                        if (key)
1027                                rx->key = key;
1028                }
1029                return RX_CONTINUE;
1030        } else {
1031                u8 keyid;
1032                /*
1033                 * The device doesn't give us the IV so we won't be
1034                 * able to look up the key. That's ok though, we
1035                 * don't need to decrypt the frame, we just won't
1036                 * be able to keep statistics accurate.
1037                 * Except for key threshold notifications, should
1038                 * we somehow allow the driver to tell us which key
1039                 * the hardware used if this flag is set?
1040                 */
1041                if ((status->flag & RX_FLAG_DECRYPTED) &&
1042                    (status->flag & RX_FLAG_IV_STRIPPED))
1043                        return RX_CONTINUE;
1044
1045                hdrlen = ieee80211_hdrlen(fc);
1046
1047                if (rx->skb->len < 8 + hdrlen)
1048                        return RX_DROP_UNUSABLE; /* TODO: count this? */
1049
1050                /*
1051                 * no need to call ieee80211_wep_get_keyidx,
1052                 * it verifies a bunch of things we've done already
1053                 */
1054                skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1055                keyidx = keyid >> 6;
1056
1057                /* check per-station GTK first, if multicast packet */
1058                if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1059                        rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1060
1061                /* if not found, try default key */
1062                if (!rx->key) {
1063                        rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1064
1065                        /*
1066                         * RSNA-protected unicast frames should always be
1067                         * sent with pairwise or station-to-station keys,
1068                         * but for WEP we allow using a key index as well.
1069                         */
1070                        if (rx->key &&
1071                            rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1072                            rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1073                            !is_multicast_ether_addr(hdr->addr1))
1074                                rx->key = NULL;
1075                }
1076        }
1077
1078        if (rx->key) {
1079                if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1080                        return RX_DROP_MONITOR;
1081
1082                rx->key->tx_rx_count++;
1083                /* TODO: add threshold stuff again */
1084        } else {
1085                return RX_DROP_MONITOR;
1086        }
1087
1088        switch (rx->key->conf.cipher) {
1089        case WLAN_CIPHER_SUITE_WEP40:
1090        case WLAN_CIPHER_SUITE_WEP104:
1091                result = ieee80211_crypto_wep_decrypt(rx);
1092                break;
1093        case WLAN_CIPHER_SUITE_TKIP:
1094                result = ieee80211_crypto_tkip_decrypt(rx);
1095                break;
1096        case WLAN_CIPHER_SUITE_CCMP:
1097                result = ieee80211_crypto_ccmp_decrypt(rx);
1098                break;
1099        case WLAN_CIPHER_SUITE_AES_CMAC:
1100                result = ieee80211_crypto_aes_cmac_decrypt(rx);
1101                break;
1102        default:
1103                /*
1104                 * We can reach here only with HW-only algorithms
1105                 * but why didn't it decrypt the frame?!
1106                 */
1107                return RX_DROP_UNUSABLE;
1108        }
1109
1110        /* the hdr variable is invalid after the decrypt handlers */
1111
1112        /* either the frame has been decrypted or will be dropped */
1113        status->flag |= RX_FLAG_DECRYPTED;
1114
1115        return result;
1116}
1117
1118static ieee80211_rx_result debug_noinline
1119ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1120{
1121        struct ieee80211_local *local;
1122        struct ieee80211_hdr *hdr;
1123        struct sk_buff *skb;
1124
1125        local = rx->local;
1126        skb = rx->skb;
1127        hdr = (struct ieee80211_hdr *) skb->data;
1128
1129        if (!local->pspolling)
1130                return RX_CONTINUE;
1131
1132        if (!ieee80211_has_fromds(hdr->frame_control))
1133                /* this is not from AP */
1134                return RX_CONTINUE;
1135
1136        if (!ieee80211_is_data(hdr->frame_control))
1137                return RX_CONTINUE;
1138
1139        if (!ieee80211_has_moredata(hdr->frame_control)) {
1140                /* AP has no more frames buffered for us */
1141                local->pspolling = false;
1142                return RX_CONTINUE;
1143        }
1144
1145        /* more data bit is set, let's request a new frame from the AP */
1146        ieee80211_send_pspoll(local, rx->sdata);
1147
1148        return RX_CONTINUE;
1149}
1150
1151static void ap_sta_ps_start(struct sta_info *sta)
1152{
1153        struct ieee80211_sub_if_data *sdata = sta->sdata;
1154        struct ieee80211_local *local = sdata->local;
1155
1156        atomic_inc(&sdata->bss->num_sta_ps);
1157        set_sta_flag(sta, WLAN_STA_PS_STA);
1158        if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1159                drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1160        ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1161               sta->sta.addr, sta->sta.aid);
1162}
1163
1164static void ap_sta_ps_end(struct sta_info *sta)
1165{
1166        ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1167               sta->sta.addr, sta->sta.aid);
1168
1169        if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1170                ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1171                       sta->sta.addr, sta->sta.aid);
1172                return;
1173        }
1174
1175        ieee80211_sta_ps_deliver_wakeup(sta);
1176}
1177
1178int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1179{
1180        struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1181        bool in_ps;
1182
1183        WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1184
1185        /* Don't let the same PS state be set twice */
1186        in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1187        if ((start && in_ps) || (!start && !in_ps))
1188                return -EINVAL;
1189
1190        if (start)
1191                ap_sta_ps_start(sta_inf);
1192        else
1193                ap_sta_ps_end(sta_inf);
1194
1195        return 0;
1196}
1197EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1198
1199static ieee80211_rx_result debug_noinline
1200ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1201{
1202        struct ieee80211_sub_if_data *sdata = rx->sdata;
1203        struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1204        struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1205        int tid, ac;
1206
1207        if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1208                return RX_CONTINUE;
1209
1210        if (sdata->vif.type != NL80211_IFTYPE_AP &&
1211            sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1212                return RX_CONTINUE;
1213
1214        /*
1215         * The device handles station powersave, so don't do anything about
1216         * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1217         * it to mac80211 since they're handled.)
1218         */
1219        if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1220                return RX_CONTINUE;
1221
1222        /*
1223         * Don't do anything if the station isn't already asleep. In
1224         * the uAPSD case, the station will probably be marked asleep,
1225         * in the PS-Poll case the station must be confused ...
1226         */
1227        if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1228                return RX_CONTINUE;
1229
1230        if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1231                if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1232                        if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1233                                ieee80211_sta_ps_deliver_poll_response(rx->sta);
1234                        else
1235                                set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1236                }
1237
1238                /* Free PS Poll skb here instead of returning RX_DROP that would
1239                 * count as an dropped frame. */
1240                dev_kfree_skb(rx->skb);
1241
1242                return RX_QUEUED;
1243        } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1244                   !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1245                   ieee80211_has_pm(hdr->frame_control) &&
1246                   (ieee80211_is_data_qos(hdr->frame_control) ||
1247                    ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1248                tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1249                ac = ieee802_1d_to_ac[tid & 7];
1250
1251                /*
1252                 * If this AC is not trigger-enabled do nothing.
1253                 *
1254                 * NB: This could/should check a separate bitmap of trigger-
1255                 * enabled queues, but for now we only implement uAPSD w/o
1256                 * TSPEC changes to the ACs, so they're always the same.
1257                 */
1258                if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1259                        return RX_CONTINUE;
1260
1261                /* if we are in a service period, do nothing */
1262                if (test_sta_flag(rx->sta, WLAN_STA_SP))
1263                        return RX_CONTINUE;
1264
1265                if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1266                        ieee80211_sta_ps_deliver_uapsd(rx->sta);
1267                else
1268                        set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1269        }
1270
1271        return RX_CONTINUE;
1272}
1273
1274static ieee80211_rx_result debug_noinline
1275ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1276{
1277        struct sta_info *sta = rx->sta;
1278        struct sk_buff *skb = rx->skb;
1279        struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1280        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1281
1282        if (!sta)
1283                return RX_CONTINUE;
1284
1285        /*
1286         * Update last_rx only for IBSS packets which are for the current
1287         * BSSID to avoid keeping the current IBSS network alive in cases
1288         * where other STAs start using different BSSID.
1289         */
1290        if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1291                u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1292                                                NL80211_IFTYPE_ADHOC);
1293                if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid)) {
1294                        sta->last_rx = jiffies;
1295                        if (ieee80211_is_data(hdr->frame_control)) {
1296                                sta->last_rx_rate_idx = status->rate_idx;
1297                                sta->last_rx_rate_flag = status->flag;
1298                        }
1299                }
1300        } else if (!is_multicast_ether_addr(hdr->addr1)) {
1301                /*
1302                 * Mesh beacons will update last_rx when if they are found to
1303                 * match the current local configuration when processed.
1304                 */
1305                sta->last_rx = jiffies;
1306                if (ieee80211_is_data(hdr->frame_control)) {
1307                        sta->last_rx_rate_idx = status->rate_idx;
1308                        sta->last_rx_rate_flag = status->flag;
1309                }
1310        }
1311
1312        if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1313                return RX_CONTINUE;
1314
1315        if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1316                ieee80211_sta_rx_notify(rx->sdata, hdr);
1317
1318        sta->rx_fragments++;
1319        sta->rx_bytes += rx->skb->len;
1320        if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1321                sta->last_signal = status->signal;
1322                ewma_add(&sta->avg_signal, -status->signal);
1323        }
1324
1325        /*
1326         * Change STA power saving mode only at the end of a frame
1327         * exchange sequence.
1328         */
1329        if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1330            !ieee80211_has_morefrags(hdr->frame_control) &&
1331            !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1332            (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1333             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1334                if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1335                        /*
1336                         * Ignore doze->wake transitions that are
1337                         * indicated by non-data frames, the standard
1338                         * is unclear here, but for example going to
1339                         * PS mode and then scanning would cause a
1340                         * doze->wake transition for the probe request,
1341                         * and that is clearly undesirable.
1342                         */
1343                        if (ieee80211_is_data(hdr->frame_control) &&
1344                            !ieee80211_has_pm(hdr->frame_control))
1345                                ap_sta_ps_end(sta);
1346                } else {
1347                        if (ieee80211_has_pm(hdr->frame_control))
1348                                ap_sta_ps_start(sta);
1349                }
1350        }
1351
1352        /*
1353         * Drop (qos-)data::nullfunc frames silently, since they
1354         * are used only to control station power saving mode.
1355         */
1356        if (ieee80211_is_nullfunc(hdr->frame_control) ||
1357            ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1358                I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1359
1360                /*
1361                 * If we receive a 4-addr nullfunc frame from a STA
1362                 * that was not moved to a 4-addr STA vlan yet send
1363                 * the event to userspace and for older hostapd drop
1364                 * the frame to the monitor interface.
1365                 */
1366                if (ieee80211_has_a4(hdr->frame_control) &&
1367                    (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1368                     (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1369                      !rx->sdata->u.vlan.sta))) {
1370                        if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1371                                cfg80211_rx_unexpected_4addr_frame(
1372                                        rx->sdata->dev, sta->sta.addr,
1373                                        GFP_ATOMIC);
1374                        return RX_DROP_MONITOR;
1375                }
1376                /*
1377                 * Update counter and free packet here to avoid
1378                 * counting this as a dropped packed.
1379                 */
1380                sta->rx_packets++;
1381                dev_kfree_skb(rx->skb);
1382                return RX_QUEUED;
1383        }
1384
1385        return RX_CONTINUE;
1386} /* ieee80211_rx_h_sta_process */
1387
1388static inline struct ieee80211_fragment_entry *
1389ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1390                         unsigned int frag, unsigned int seq, int rx_queue,
1391                         struct sk_buff **skb)
1392{
1393        struct ieee80211_fragment_entry *entry;
1394        int idx;
1395
1396        idx = sdata->fragment_next;
1397        entry = &sdata->fragments[sdata->fragment_next++];
1398        if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1399                sdata->fragment_next = 0;
1400
1401        if (!skb_queue_empty(&entry->skb_list))
1402                __skb_queue_purge(&entry->skb_list);
1403
1404        __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1405        *skb = NULL;
1406        entry->first_frag_time = jiffies;
1407        entry->seq = seq;
1408        entry->rx_queue = rx_queue;
1409        entry->last_frag = frag;
1410        entry->ccmp = 0;
1411        entry->extra_len = 0;
1412
1413        return entry;
1414}
1415
1416static inline struct ieee80211_fragment_entry *
1417ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1418                          unsigned int frag, unsigned int seq,
1419                          int rx_queue, struct ieee80211_hdr *hdr)
1420{
1421        struct ieee80211_fragment_entry *entry;
1422        int i, idx;
1423
1424        idx = sdata->fragment_next;
1425        for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1426                struct ieee80211_hdr *f_hdr;
1427
1428                idx--;
1429                if (idx < 0)
1430                        idx = IEEE80211_FRAGMENT_MAX - 1;
1431
1432                entry = &sdata->fragments[idx];
1433                if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1434                    entry->rx_queue != rx_queue ||
1435                    entry->last_frag + 1 != frag)
1436                        continue;
1437
1438                f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1439
1440                /*
1441                 * Check ftype and addresses are equal, else check next fragment
1442                 */
1443                if (((hdr->frame_control ^ f_hdr->frame_control) &
1444                     cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1445                    !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1446                    !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1447                        continue;
1448
1449                if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1450                        __skb_queue_purge(&entry->skb_list);
1451                        continue;
1452                }
1453                return entry;
1454        }
1455
1456        return NULL;
1457}
1458
1459static ieee80211_rx_result debug_noinline
1460ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1461{
1462        struct ieee80211_hdr *hdr;
1463        u16 sc;
1464        __le16 fc;
1465        unsigned int frag, seq;
1466        struct ieee80211_fragment_entry *entry;
1467        struct sk_buff *skb;
1468        struct ieee80211_rx_status *status;
1469
1470        hdr = (struct ieee80211_hdr *)rx->skb->data;
1471        fc = hdr->frame_control;
1472
1473        if (ieee80211_is_ctl(fc))
1474                return RX_CONTINUE;
1475
1476        sc = le16_to_cpu(hdr->seq_ctrl);
1477        frag = sc & IEEE80211_SCTL_FRAG;
1478
1479        if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1480                   is_multicast_ether_addr(hdr->addr1))) {
1481                /* not fragmented */
1482                goto out;
1483        }
1484        I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1485
1486        if (skb_linearize(rx->skb))
1487                return RX_DROP_UNUSABLE;
1488
1489        /*
1490         *  skb_linearize() might change the skb->data and
1491         *  previously cached variables (in this case, hdr) need to
1492         *  be refreshed with the new data.
1493         */
1494        hdr = (struct ieee80211_hdr *)rx->skb->data;
1495        seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1496
1497        if (frag == 0) {
1498                /* This is the first fragment of a new frame. */
1499                entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1500                                                 rx->seqno_idx, &(rx->skb));
1501                if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1502                    ieee80211_has_protected(fc)) {
1503                        int queue = rx->security_idx;
1504                        /* Store CCMP PN so that we can verify that the next
1505                         * fragment has a sequential PN value. */
1506                        entry->ccmp = 1;
1507                        memcpy(entry->last_pn,
1508                               rx->key->u.ccmp.rx_pn[queue],
1509                               CCMP_PN_LEN);
1510                }
1511                return RX_QUEUED;
1512        }
1513
1514        /* This is a fragment for a frame that should already be pending in
1515         * fragment cache. Add this fragment to the end of the pending entry.
1516         */
1517        entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1518                                          rx->seqno_idx, hdr);
1519        if (!entry) {
1520                I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1521                return RX_DROP_MONITOR;
1522        }
1523
1524        /* Verify that MPDUs within one MSDU have sequential PN values.
1525         * (IEEE 802.11i, 8.3.3.4.5) */
1526        if (entry->ccmp) {
1527                int i;
1528                u8 pn[CCMP_PN_LEN], *rpn;
1529                int queue;
1530                if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1531                        return RX_DROP_UNUSABLE;
1532                memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1533                for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1534                        pn[i]++;
1535                        if (pn[i])
1536                                break;
1537                }
1538                queue = rx->security_idx;
1539                rpn = rx->key->u.ccmp.rx_pn[queue];
1540                if (memcmp(pn, rpn, CCMP_PN_LEN))
1541                        return RX_DROP_UNUSABLE;
1542                memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1543        }
1544
1545        skb_pull(rx->skb, ieee80211_hdrlen(fc));
1546        __skb_queue_tail(&entry->skb_list, rx->skb);
1547        entry->last_frag = frag;
1548        entry->extra_len += rx->skb->len;
1549        if (ieee80211_has_morefrags(fc)) {
1550                rx->skb = NULL;
1551                return RX_QUEUED;
1552        }
1553
1554        rx->skb = __skb_dequeue(&entry->skb_list);
1555        if (skb_tailroom(rx->skb) < entry->extra_len) {
1556                I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1557                if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1558                                              GFP_ATOMIC))) {
1559                        I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1560                        __skb_queue_purge(&entry->skb_list);
1561                        return RX_DROP_UNUSABLE;
1562                }
1563        }
1564        while ((skb = __skb_dequeue(&entry->skb_list))) {
1565                memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1566                dev_kfree_skb(skb);
1567        }
1568
1569        /* Complete frame has been reassembled - process it now */
1570        status = IEEE80211_SKB_RXCB(rx->skb);
1571        status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1572
1573 out:
1574        if (rx->sta)
1575                rx->sta->rx_packets++;
1576        if (is_multicast_ether_addr(hdr->addr1))
1577                rx->local->dot11MulticastReceivedFrameCount++;
1578        else
1579                ieee80211_led_rx(rx->local);
1580        return RX_CONTINUE;
1581}
1582
1583static int
1584ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1585{
1586        if (unlikely(!rx->sta ||
1587            !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1588                return -EACCES;
1589
1590        return 0;
1591}
1592
1593static int
1594ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1595{
1596        struct sk_buff *skb = rx->skb;
1597        struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1598
1599        /*
1600         * Pass through unencrypted frames if the hardware has
1601         * decrypted them already.
1602         */
1603        if (status->flag & RX_FLAG_DECRYPTED)
1604                return 0;
1605
1606        /* Drop unencrypted frames if key is set. */
1607        if (unlikely(!ieee80211_has_protected(fc) &&
1608                     !ieee80211_is_nullfunc(fc) &&
1609                     ieee80211_is_data(fc) &&
1610                     (rx->key || rx->sdata->drop_unencrypted)))
1611                return -EACCES;
1612
1613        return 0;
1614}
1615
1616static int
1617ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1618{
1619        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1620        struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1621        __le16 fc = hdr->frame_control;
1622
1623        /*
1624         * Pass through unencrypted frames if the hardware has
1625         * decrypted them already.
1626         */
1627        if (status->flag & RX_FLAG_DECRYPTED)
1628                return 0;
1629
1630        if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1631                if (unlikely(!ieee80211_has_protected(fc) &&
1632                             ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1633                             rx->key)) {
1634                        if (ieee80211_is_deauth(fc))
1635                                cfg80211_send_unprot_deauth(rx->sdata->dev,
1636                                                            rx->skb->data,
1637                                                            rx->skb->len);
1638                        else if (ieee80211_is_disassoc(fc))
1639                                cfg80211_send_unprot_disassoc(rx->sdata->dev,
1640                                                              rx->skb->data,
1641                                                              rx->skb->len);
1642                        return -EACCES;
1643                }
1644                /* BIP does not use Protected field, so need to check MMIE */
1645                if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1646                             ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1647                        if (ieee80211_is_deauth(fc))
1648                                cfg80211_send_unprot_deauth(rx->sdata->dev,
1649                                                            rx->skb->data,
1650                                                            rx->skb->len);
1651                        else if (ieee80211_is_disassoc(fc))
1652                                cfg80211_send_unprot_disassoc(rx->sdata->dev,
1653                                                              rx->skb->data,
1654                                                              rx->skb->len);
1655                        return -EACCES;
1656                }
1657                /*
1658                 * When using MFP, Action frames are not allowed prior to
1659                 * having configured keys.
1660                 */
1661                if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1662                             ieee80211_is_robust_mgmt_frame(
1663                                     (struct ieee80211_hdr *) rx->skb->data)))
1664                        return -EACCES;
1665        }
1666
1667        return 0;
1668}
1669
1670static int
1671__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1672{
1673        struct ieee80211_sub_if_data *sdata = rx->sdata;
1674        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1675        bool check_port_control = false;
1676        struct ethhdr *ehdr;
1677        int ret;
1678
1679        *port_control = false;
1680        if (ieee80211_has_a4(hdr->frame_control) &&
1681            sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1682                return -1;
1683
1684        if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1685            !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1686
1687                if (!sdata->u.mgd.use_4addr)
1688                        return -1;
1689                else
1690                        check_port_control = true;
1691        }
1692
1693        if (is_multicast_ether_addr(hdr->addr1) &&
1694            sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1695                return -1;
1696
1697        ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1698        if (ret < 0)
1699                return ret;
1700
1701        ehdr = (struct ethhdr *) rx->skb->data;
1702        if (ehdr->h_proto == rx->sdata->control_port_protocol)
1703                *port_control = true;
1704        else if (check_port_control)
1705                return -1;
1706
1707        return 0;
1708}
1709
1710/*
1711 * requires that rx->skb is a frame with ethernet header
1712 */
1713static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1714{
1715        static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1716                = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1717        struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1718
1719        /*
1720         * Allow EAPOL frames to us/the PAE group address regardless
1721         * of whether the frame was encrypted or not.
1722         */
1723        if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1724            (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1725             ether_addr_equal(ehdr->h_dest, pae_group_addr)))
1726                return true;
1727
1728        if (ieee80211_802_1x_port_control(rx) ||
1729            ieee80211_drop_unencrypted(rx, fc))
1730                return false;
1731
1732        return true;
1733}
1734
1735/*
1736 * requires that rx->skb is a frame with ethernet header
1737 */
1738static void
1739ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1740{
1741        struct ieee80211_sub_if_data *sdata = rx->sdata;
1742        struct net_device *dev = sdata->dev;
1743        struct sk_buff *skb, *xmit_skb;
1744        struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1745        struct sta_info *dsta;
1746        struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1747
1748        skb = rx->skb;
1749        xmit_skb = NULL;
1750
1751        if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1752             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1753            !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1754            (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1755            (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1756                if (is_multicast_ether_addr(ehdr->h_dest)) {
1757                        /*
1758                         * send multicast frames both to higher layers in
1759                         * local net stack and back to the wireless medium
1760                         */
1761                        xmit_skb = skb_copy(skb, GFP_ATOMIC);
1762                        if (!xmit_skb)
1763                                net_info_ratelimited("%s: failed to clone multicast frame\n",
1764                                                    dev->name);
1765                } else {
1766                        dsta = sta_info_get(sdata, skb->data);
1767                        if (dsta) {
1768                                /*
1769                                 * The destination station is associated to
1770                                 * this AP (in this VLAN), so send the frame
1771                                 * directly to it and do not pass it to local
1772                                 * net stack.
1773                                 */
1774                                xmit_skb = skb;
1775                                skb = NULL;
1776                        }
1777                }
1778        }
1779
1780        if (skb) {
1781                int align __maybe_unused;
1782
1783#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1784                /*
1785                 * 'align' will only take the values 0 or 2 here
1786                 * since all frames are required to be aligned
1787                 * to 2-byte boundaries when being passed to
1788                 * mac80211. That also explains the __skb_push()
1789                 * below.
1790                 */
1791                align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1792                if (align) {
1793                        if (WARN_ON(skb_headroom(skb) < 3)) {
1794                                dev_kfree_skb(skb);
1795                                skb = NULL;
1796                        } else {
1797                                u8 *data = skb->data;
1798                                size_t len = skb_headlen(skb);
1799                                skb->data -= align;
1800                                memmove(skb->data, data, len);
1801                                skb_set_tail_pointer(skb, len);
1802                        }
1803                }
1804#endif
1805
1806                if (skb) {
1807                        /* deliver to local stack */
1808                        skb->protocol = eth_type_trans(skb, dev);
1809                        memset(skb->cb, 0, sizeof(skb->cb));
1810                        netif_receive_skb(skb);
1811                }
1812        }
1813
1814        if (xmit_skb) {
1815                /*
1816                 * Send to wireless media and increase priority by 256 to
1817                 * keep the received priority instead of reclassifying
1818                 * the frame (see cfg80211_classify8021d).
1819                 */
1820                xmit_skb->priority += 256;
1821                xmit_skb->protocol = htons(ETH_P_802_3);
1822                skb_reset_network_header(xmit_skb);
1823                skb_reset_mac_header(xmit_skb);
1824                dev_queue_xmit(xmit_skb);
1825        }
1826}
1827
1828static ieee80211_rx_result debug_noinline
1829ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1830{
1831        struct net_device *dev = rx->sdata->dev;
1832        struct sk_buff *skb = rx->skb;
1833        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1834        __le16 fc = hdr->frame_control;
1835        struct sk_buff_head frame_list;
1836        struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1837
1838        if (unlikely(!ieee80211_is_data(fc)))
1839                return RX_CONTINUE;
1840
1841        if (unlikely(!ieee80211_is_data_present(fc)))
1842                return RX_DROP_MONITOR;
1843
1844        if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1845                return RX_CONTINUE;
1846
1847        if (ieee80211_has_a4(hdr->frame_control) &&
1848            rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1849            !rx->sdata->u.vlan.sta)
1850                return RX_DROP_UNUSABLE;
1851
1852        if (is_multicast_ether_addr(hdr->addr1) &&
1853            ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1854              rx->sdata->u.vlan.sta) ||
1855             (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1856              rx->sdata->u.mgd.use_4addr)))
1857                return RX_DROP_UNUSABLE;
1858
1859        skb->dev = dev;
1860        __skb_queue_head_init(&frame_list);
1861
1862        if (skb_linearize(skb))
1863                return RX_DROP_UNUSABLE;
1864
1865        ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1866                                 rx->sdata->vif.type,
1867                                 rx->local->hw.extra_tx_headroom, true);
1868
1869        while (!skb_queue_empty(&frame_list)) {
1870                rx->skb = __skb_dequeue(&frame_list);
1871
1872                if (!ieee80211_frame_allowed(rx, fc)) {
1873                        dev_kfree_skb(rx->skb);
1874                        continue;
1875                }
1876                dev->stats.rx_packets++;
1877                dev->stats.rx_bytes += rx->skb->len;
1878
1879                ieee80211_deliver_skb(rx);
1880        }
1881
1882        return RX_QUEUED;
1883}
1884
1885#ifdef CONFIG_MAC80211_MESH
1886static ieee80211_rx_result
1887ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1888{
1889        struct ieee80211_hdr *fwd_hdr, *hdr;
1890        struct ieee80211_tx_info *info;
1891        struct ieee80211s_hdr *mesh_hdr;
1892        struct sk_buff *skb = rx->skb, *fwd_skb;
1893        struct ieee80211_local *local = rx->local;
1894        struct ieee80211_sub_if_data *sdata = rx->sdata;
1895        struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1896        struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1897        __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
1898        u16 q, hdrlen;
1899
1900        hdr = (struct ieee80211_hdr *) skb->data;
1901        hdrlen = ieee80211_hdrlen(hdr->frame_control);
1902
1903        /* make sure fixed part of mesh header is there, also checks skb len */
1904        if (!pskb_may_pull(rx->skb, hdrlen + 6))
1905                return RX_DROP_MONITOR;
1906
1907        mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1908
1909        /* make sure full mesh header is there, also checks skb len */
1910        if (!pskb_may_pull(rx->skb,
1911                           hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
1912                return RX_DROP_MONITOR;
1913
1914        /* reload pointers */
1915        hdr = (struct ieee80211_hdr *) skb->data;
1916        mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1917
1918        /* frame is in RMC, don't forward */
1919        if (ieee80211_is_data(hdr->frame_control) &&
1920            is_multicast_ether_addr(hdr->addr1) &&
1921            mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1922                return RX_DROP_MONITOR;
1923
1924        if (!ieee80211_is_data(hdr->frame_control) ||
1925            !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1926                return RX_CONTINUE;
1927
1928        if (!mesh_hdr->ttl)
1929                return RX_DROP_MONITOR;
1930
1931        if (mesh_hdr->flags & MESH_FLAGS_AE) {
1932                struct mesh_path *mppath;
1933                char *proxied_addr;
1934                char *mpp_addr;
1935
1936                if (is_multicast_ether_addr(hdr->addr1)) {
1937                        mpp_addr = hdr->addr3;
1938                        proxied_addr = mesh_hdr->eaddr1;
1939                } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
1940                        /* has_a4 already checked in ieee80211_rx_mesh_check */
1941                        mpp_addr = hdr->addr4;
1942                        proxied_addr = mesh_hdr->eaddr2;
1943                } else {
1944                        return RX_DROP_MONITOR;
1945                }
1946
1947                rcu_read_lock();
1948                mppath = mpp_path_lookup(proxied_addr, sdata);
1949                if (!mppath) {
1950                        mpp_path_add(proxied_addr, mpp_addr, sdata);
1951                } else {
1952                        spin_lock_bh(&mppath->state_lock);
1953                        if (!ether_addr_equal(mppath->mpp, mpp_addr))
1954                                memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1955                        spin_unlock_bh(&mppath->state_lock);
1956                }
1957                rcu_read_unlock();
1958        }
1959
1960        /* Frame has reached destination.  Don't forward */
1961        if (!is_multicast_ether_addr(hdr->addr1) &&
1962            ether_addr_equal(sdata->vif.addr, hdr->addr3))
1963                return RX_CONTINUE;
1964
1965        q = ieee80211_select_queue_80211(sdata, skb, hdr);
1966        if (ieee80211_queue_stopped(&local->hw, q)) {
1967                IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
1968                return RX_DROP_MONITOR;
1969        }
1970        skb_set_queue_mapping(skb, q);
1971
1972        if (!--mesh_hdr->ttl) {
1973                IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
1974                goto out;
1975        }
1976
1977        if (!ifmsh->mshcfg.dot11MeshForwarding)
1978                goto out;
1979
1980        fwd_skb = skb_copy(skb, GFP_ATOMIC);
1981        if (!fwd_skb) {
1982                net_info_ratelimited("%s: failed to clone mesh frame\n",
1983                                    sdata->name);
1984                goto out;
1985        }
1986
1987        fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
1988        info = IEEE80211_SKB_CB(fwd_skb);
1989        memset(info, 0, sizeof(*info));
1990        info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1991        info->control.vif = &rx->sdata->vif;
1992        info->control.jiffies = jiffies;
1993        if (is_multicast_ether_addr(fwd_hdr->addr1)) {
1994                IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
1995                memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1996        } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
1997                IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
1998        } else {
1999                /* unable to resolve next hop */
2000                mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
2001                                    0, reason, fwd_hdr->addr2, sdata);
2002                IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2003                kfree_skb(fwd_skb);
2004                return RX_DROP_MONITOR;
2005        }
2006
2007        IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2008        ieee80211_add_pending_skb(local, fwd_skb);
2009 out:
2010        if (is_multicast_ether_addr(hdr->addr1) ||
2011            sdata->dev->flags & IFF_PROMISC)
2012                return RX_CONTINUE;
2013        else
2014                return RX_DROP_MONITOR;
2015}
2016#endif
2017
2018static ieee80211_rx_result debug_noinline
2019ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2020{
2021        struct ieee80211_sub_if_data *sdata = rx->sdata;
2022        struct ieee80211_local *local = rx->local;
2023        struct net_device *dev = sdata->dev;
2024        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2025        __le16 fc = hdr->frame_control;
2026        bool port_control;
2027        int err;
2028
2029        if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2030                return RX_CONTINUE;
2031
2032        if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2033                return RX_DROP_MONITOR;
2034
2035        /*
2036         * Send unexpected-4addr-frame event to hostapd. For older versions,
2037         * also drop the frame to cooked monitor interfaces.
2038         */
2039        if (ieee80211_has_a4(hdr->frame_control) &&
2040            sdata->vif.type == NL80211_IFTYPE_AP) {
2041                if (rx->sta &&
2042                    !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2043                        cfg80211_rx_unexpected_4addr_frame(
2044                                rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2045                return RX_DROP_MONITOR;
2046        }
2047
2048        err = __ieee80211_data_to_8023(rx, &port_control);
2049        if (unlikely(err))
2050                return RX_DROP_UNUSABLE;
2051
2052        if (!ieee80211_frame_allowed(rx, fc))
2053                return RX_DROP_MONITOR;
2054
2055        if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2056            unlikely(port_control) && sdata->bss) {
2057                sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2058                                     u.ap);
2059                dev = sdata->dev;
2060                rx->sdata = sdata;
2061        }
2062
2063        rx->skb->dev = dev;
2064
2065        dev->stats.rx_packets++;
2066        dev->stats.rx_bytes += rx->skb->len;
2067
2068        if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2069            !is_multicast_ether_addr(
2070                    ((struct ethhdr *)rx->skb->data)->h_dest) &&
2071            (!local->scanning &&
2072             !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2073                        mod_timer(&local->dynamic_ps_timer, jiffies +
2074                         msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2075        }
2076
2077        ieee80211_deliver_skb(rx);
2078
2079        return RX_QUEUED;
2080}
2081
2082static ieee80211_rx_result debug_noinline
2083ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
2084{
2085        struct sk_buff *skb = rx->skb;
2086        struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2087        struct tid_ampdu_rx *tid_agg_rx;
2088        u16 start_seq_num;
2089        u16 tid;
2090
2091        if (likely(!ieee80211_is_ctl(bar->frame_control)))
2092                return RX_CONTINUE;
2093
2094        if (ieee80211_is_back_req(bar->frame_control)) {
2095                struct {
2096                        __le16 control, start_seq_num;
2097                } __packed bar_data;
2098
2099                if (!rx->sta)
2100                        return RX_DROP_MONITOR;
2101
2102                if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2103                                  &bar_data, sizeof(bar_data)))
2104                        return RX_DROP_MONITOR;
2105
2106                tid = le16_to_cpu(bar_data.control) >> 12;
2107
2108                tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2109                if (!tid_agg_rx)
2110                        return RX_DROP_MONITOR;
2111
2112                start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2113
2114                /* reset session timer */
2115                if (tid_agg_rx->timeout)
2116                        mod_timer(&tid_agg_rx->session_timer,
2117                                  TU_TO_EXP_TIME(tid_agg_rx->timeout));
2118
2119                spin_lock(&tid_agg_rx->reorder_lock);
2120                /* release stored frames up to start of BAR */
2121                ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2122                                                 start_seq_num);
2123                spin_unlock(&tid_agg_rx->reorder_lock);
2124
2125                kfree_skb(skb);
2126                return RX_QUEUED;
2127        }
2128
2129        /*
2130         * After this point, we only want management frames,
2131         * so we can drop all remaining control frames to
2132         * cooked monitor interfaces.
2133         */
2134        return RX_DROP_MONITOR;
2135}
2136
2137static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2138                                           struct ieee80211_mgmt *mgmt,
2139                                           size_t len)
2140{
2141        struct ieee80211_local *local = sdata->local;
2142        struct sk_buff *skb;
2143        struct ieee80211_mgmt *resp;
2144
2145        if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2146                /* Not to own unicast address */
2147                return;
2148        }
2149
2150        if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2151            !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2152                /* Not from the current AP or not associated yet. */
2153                return;
2154        }
2155
2156        if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2157                /* Too short SA Query request frame */
2158                return;
2159        }
2160
2161        skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2162        if (skb == NULL)
2163                return;
2164
2165        skb_reserve(skb, local->hw.extra_tx_headroom);
2166        resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2167        memset(resp, 0, 24);
2168        memcpy(resp->da, mgmt->sa, ETH_ALEN);
2169        memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2170        memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2171        resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2172                                          IEEE80211_STYPE_ACTION);
2173        skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2174        resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2175        resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2176        memcpy(resp->u.action.u.sa_query.trans_id,
2177               mgmt->u.action.u.sa_query.trans_id,
2178               WLAN_SA_QUERY_TR_ID_LEN);
2179
2180        ieee80211_tx_skb(sdata, skb);
2181}
2182
2183static ieee80211_rx_result debug_noinline
2184ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2185{
2186        struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2187        struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2188
2189        /*
2190         * From here on, look only at management frames.
2191         * Data and control frames are already handled,
2192         * and unknown (reserved) frames are useless.
2193         */
2194        if (rx->skb->len < 24)
2195                return RX_DROP_MONITOR;
2196
2197        if (!ieee80211_is_mgmt(mgmt->frame_control))
2198                return RX_DROP_MONITOR;
2199
2200        if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2201            ieee80211_is_beacon(mgmt->frame_control) &&
2202            !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2203                int sig = 0;
2204
2205                if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2206                        sig = status->signal;
2207
2208                cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2209                                            rx->skb->data, rx->skb->len,
2210                                            status->freq, sig, GFP_ATOMIC);
2211                rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2212        }
2213
2214        if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2215                return RX_DROP_MONITOR;
2216
2217        if (ieee80211_drop_unencrypted_mgmt(rx))
2218                return RX_DROP_UNUSABLE;
2219
2220        return RX_CONTINUE;
2221}
2222
2223static ieee80211_rx_result debug_noinline
2224ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2225{
2226        struct ieee80211_local *local = rx->local;
2227        struct ieee80211_sub_if_data *sdata = rx->sdata;
2228        struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2229        struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2230        int len = rx->skb->len;
2231
2232        if (!ieee80211_is_action(mgmt->frame_control))
2233                return RX_CONTINUE;
2234
2235        /* drop too small frames */
2236        if (len < IEEE80211_MIN_ACTION_SIZE)
2237                return RX_DROP_UNUSABLE;
2238
2239        if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
2240                return RX_DROP_UNUSABLE;
2241
2242        if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2243                return RX_DROP_UNUSABLE;
2244
2245        switch (mgmt->u.action.category) {
2246        case WLAN_CATEGORY_HT:
2247                /* reject HT action frames from stations not supporting HT */
2248                if (!rx->sta->sta.ht_cap.ht_supported)
2249                        goto invalid;
2250
2251                if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2252                    sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2253                    sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2254                    sdata->vif.type != NL80211_IFTYPE_AP &&
2255                    sdata->vif.type != NL80211_IFTYPE_ADHOC)
2256                        break;
2257
2258                /* verify action & smps_control are present */
2259                if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2260                        goto invalid;
2261
2262                switch (mgmt->u.action.u.ht_smps.action) {
2263                case WLAN_HT_ACTION_SMPS: {
2264                        struct ieee80211_supported_band *sband;
2265                        u8 smps;
2266
2267                        /* convert to HT capability */
2268                        switch (mgmt->u.action.u.ht_smps.smps_control) {
2269                        case WLAN_HT_SMPS_CONTROL_DISABLED:
2270                                smps = WLAN_HT_CAP_SM_PS_DISABLED;
2271                                break;
2272                        case WLAN_HT_SMPS_CONTROL_STATIC:
2273                                smps = WLAN_HT_CAP_SM_PS_STATIC;
2274                                break;
2275                        case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2276                                smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2277                                break;
2278                        default:
2279                                goto invalid;
2280                        }
2281                        smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2282
2283                        /* if no change do nothing */
2284                        if ((rx->sta->sta.ht_cap.cap &
2285                                        IEEE80211_HT_CAP_SM_PS) == smps)
2286                                goto handled;
2287
2288                        rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2289                        rx->sta->sta.ht_cap.cap |= smps;
2290
2291                        sband = rx->local->hw.wiphy->bands[status->band];
2292
2293                        rate_control_rate_update(local, sband, rx->sta,
2294                                                 IEEE80211_RC_SMPS_CHANGED);
2295                        goto handled;
2296                }
2297                default:
2298                        goto invalid;
2299                }
2300
2301                break;
2302        case WLAN_CATEGORY_BACK:
2303                if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2304                    sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2305                    sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2306                    sdata->vif.type != NL80211_IFTYPE_AP &&
2307                    sdata->vif.type != NL80211_IFTYPE_ADHOC)
2308                        break;
2309
2310                /* verify action_code is present */
2311                if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2312                        break;
2313
2314                switch (mgmt->u.action.u.addba_req.action_code) {
2315                case WLAN_ACTION_ADDBA_REQ:
2316                        if (len < (IEEE80211_MIN_ACTION_SIZE +
2317                                   sizeof(mgmt->u.action.u.addba_req)))
2318                                goto invalid;
2319                        break;
2320                case WLAN_ACTION_ADDBA_RESP:
2321                        if (len < (IEEE80211_MIN_ACTION_SIZE +
2322                                   sizeof(mgmt->u.action.u.addba_resp)))
2323                                goto invalid;
2324                        break;
2325                case WLAN_ACTION_DELBA:
2326                        if (len < (IEEE80211_MIN_ACTION_SIZE +
2327                                   sizeof(mgmt->u.action.u.delba)))
2328                                goto invalid;
2329                        break;
2330                default:
2331                        goto invalid;
2332                }
2333
2334                goto queue;
2335        case WLAN_CATEGORY_SPECTRUM_MGMT:
2336                if (status->band != IEEE80211_BAND_5GHZ)
2337                        break;
2338
2339                if (sdata->vif.type != NL80211_IFTYPE_STATION)
2340                        break;
2341
2342                /* verify action_code is present */
2343                if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2344                        break;
2345
2346                switch (mgmt->u.action.u.measurement.action_code) {
2347                case WLAN_ACTION_SPCT_MSR_REQ:
2348                        if (len < (IEEE80211_MIN_ACTION_SIZE +
2349                                   sizeof(mgmt->u.action.u.measurement)))
2350                                break;
2351                        ieee80211_process_measurement_req(sdata, mgmt, len);
2352                        goto handled;
2353                case WLAN_ACTION_SPCT_CHL_SWITCH:
2354                        if (len < (IEEE80211_MIN_ACTION_SIZE +
2355                                   sizeof(mgmt->u.action.u.chan_switch)))
2356                                break;
2357
2358                        if (sdata->vif.type != NL80211_IFTYPE_STATION)
2359                                break;
2360
2361                        if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2362                                break;
2363
2364                        goto queue;
2365                }
2366                break;
2367        case WLAN_CATEGORY_SA_QUERY:
2368                if (len < (IEEE80211_MIN_ACTION_SIZE +
2369                           sizeof(mgmt->u.action.u.sa_query)))
2370                        break;
2371
2372                switch (mgmt->u.action.u.sa_query.action) {
2373                case WLAN_ACTION_SA_QUERY_REQUEST:
2374                        if (sdata->vif.type != NL80211_IFTYPE_STATION)
2375                                break;
2376                        ieee80211_process_sa_query_req(sdata, mgmt, len);
2377                        goto handled;
2378                }
2379                break;
2380        case WLAN_CATEGORY_SELF_PROTECTED:
2381                if (len < (IEEE80211_MIN_ACTION_SIZE +
2382                           sizeof(mgmt->u.action.u.self_prot.action_code)))
2383                        break;
2384
2385                switch (mgmt->u.action.u.self_prot.action_code) {
2386                case WLAN_SP_MESH_PEERING_OPEN:
2387                case WLAN_SP_MESH_PEERING_CLOSE:
2388                case WLAN_SP_MESH_PEERING_CONFIRM:
2389                        if (!ieee80211_vif_is_mesh(&sdata->vif))
2390                                goto invalid;
2391                        if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2392                                /* userspace handles this frame */
2393                                break;
2394                        goto queue;
2395                case WLAN_SP_MGK_INFORM:
2396                case WLAN_SP_MGK_ACK:
2397                        if (!ieee80211_vif_is_mesh(&sdata->vif))
2398                                goto invalid;
2399                        break;
2400                }
2401                break;
2402        case WLAN_CATEGORY_MESH_ACTION:
2403                if (len < (IEEE80211_MIN_ACTION_SIZE +
2404                           sizeof(mgmt->u.action.u.mesh_action.action_code)))
2405                        break;
2406
2407                if (!ieee80211_vif_is_mesh(&sdata->vif))
2408                        break;
2409                if (mesh_action_is_path_sel(mgmt) &&
2410                  (!mesh_path_sel_is_hwmp(sdata)))
2411                        break;
2412                goto queue;
2413        }
2414
2415        return RX_CONTINUE;
2416
2417 invalid:
2418        status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2419        /* will return in the next handlers */
2420        return RX_CONTINUE;
2421
2422 handled:
2423        if (rx->sta)
2424                rx->sta->rx_packets++;
2425        dev_kfree_skb(rx->skb);
2426        return RX_QUEUED;
2427
2428 queue:
2429        rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2430        skb_queue_tail(&sdata->skb_queue, rx->skb);
2431        ieee80211_queue_work(&local->hw, &sdata->work);
2432        if (rx->sta)
2433                rx->sta->rx_packets++;
2434        return RX_QUEUED;
2435}
2436
2437static ieee80211_rx_result debug_noinline
2438ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2439{
2440        struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2441        int sig = 0;
2442
2443        /* skip known-bad action frames and return them in the next handler */
2444        if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2445                return RX_CONTINUE;
2446
2447        /*
2448         * Getting here means the kernel doesn't know how to handle
2449         * it, but maybe userspace does ... include returned frames
2450         * so userspace can register for those to know whether ones
2451         * it transmitted were processed or returned.
2452         */
2453
2454        if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2455                sig = status->signal;
2456
2457        if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2458                             rx->skb->data, rx->skb->len,
2459                             GFP_ATOMIC)) {
2460                if (rx->sta)
2461                        rx->sta->rx_packets++;
2462                dev_kfree_skb(rx->skb);
2463                return RX_QUEUED;
2464        }
2465
2466
2467        return RX_CONTINUE;
2468}
2469
2470static ieee80211_rx_result debug_noinline
2471ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2472{
2473        struct ieee80211_local *local = rx->local;
2474        struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2475        struct sk_buff *nskb;
2476        struct ieee80211_sub_if_data *sdata = rx->sdata;
2477        struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2478
2479        if (!ieee80211_is_action(mgmt->frame_control))
2480                return RX_CONTINUE;
2481
2482        /*
2483         * For AP mode, hostapd is responsible for handling any action
2484         * frames that we didn't handle, including returning unknown
2485         * ones. For all other modes we will return them to the sender,
2486         * setting the 0x80 bit in the action category, as required by
2487         * 802.11-2012 9.24.4.
2488         * Newer versions of hostapd shall also use the management frame
2489         * registration mechanisms, but older ones still use cooked
2490         * monitor interfaces so push all frames there.
2491         */
2492        if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2493            (sdata->vif.type == NL80211_IFTYPE_AP ||
2494             sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2495                return RX_DROP_MONITOR;
2496
2497        if (is_multicast_ether_addr(mgmt->da))
2498                return RX_DROP_MONITOR;
2499
2500        /* do not return rejected action frames */
2501        if (mgmt->u.action.category & 0x80)
2502                return RX_DROP_UNUSABLE;
2503
2504        nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2505                               GFP_ATOMIC);
2506        if (nskb) {
2507                struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2508
2509                nmgmt->u.action.category |= 0x80;
2510                memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2511                memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2512
2513                memset(nskb->cb, 0, sizeof(nskb->cb));
2514
2515                ieee80211_tx_skb(rx->sdata, nskb);
2516        }
2517        dev_kfree_skb(rx->skb);
2518        return RX_QUEUED;
2519}
2520
2521static ieee80211_rx_result debug_noinline
2522ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2523{
2524        struct ieee80211_sub_if_data *sdata = rx->sdata;
2525        struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2526        __le16 stype;
2527
2528        stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2529
2530        if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2531            sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2532            sdata->vif.type != NL80211_IFTYPE_STATION)
2533                return RX_DROP_MONITOR;
2534
2535        switch (stype) {
2536        case cpu_to_le16(IEEE80211_STYPE_AUTH):
2537        case cpu_to_le16(IEEE80211_STYPE_BEACON):
2538        case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2539                /* process for all: mesh, mlme, ibss */
2540                break;
2541        case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2542        case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2543        case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2544        case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2545                if (is_multicast_ether_addr(mgmt->da) &&
2546                    !is_broadcast_ether_addr(mgmt->da))
2547                        return RX_DROP_MONITOR;
2548
2549                /* process only for station */
2550                if (sdata->vif.type != NL80211_IFTYPE_STATION)
2551                        return RX_DROP_MONITOR;
2552                break;
2553        case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2554                /* process only for ibss */
2555                if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2556                        return RX_DROP_MONITOR;
2557                break;
2558        default:
2559                return RX_DROP_MONITOR;
2560        }
2561
2562        /* queue up frame and kick off work to process it */
2563        rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2564        skb_queue_tail(&sdata->skb_queue, rx->skb);
2565        ieee80211_queue_work(&rx->local->hw, &sdata->work);
2566        if (rx->sta)
2567                rx->sta->rx_packets++;
2568
2569        return RX_QUEUED;
2570}
2571
2572/* TODO: use IEEE80211_RX_FRAGMENTED */
2573static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2574                                        struct ieee80211_rate *rate)
2575{
2576        struct ieee80211_sub_if_data *sdata;
2577        struct ieee80211_local *local = rx->local;
2578        struct sk_buff *skb = rx->skb, *skb2;
2579        struct net_device *prev_dev = NULL;
2580        struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2581        int needed_headroom;
2582
2583        /*
2584         * If cooked monitor has been processed already, then
2585         * don't do it again. If not, set the flag.
2586         */
2587        if (rx->flags & IEEE80211_RX_CMNTR)
2588                goto out_free_skb;
2589        rx->flags |= IEEE80211_RX_CMNTR;
2590
2591        /* If there are no cooked monitor interfaces, just free the SKB */
2592        if (!local->cooked_mntrs)
2593                goto out_free_skb;
2594
2595        /* room for the radiotap header based on driver features */
2596        needed_headroom = ieee80211_rx_radiotap_len(local, status);
2597
2598        if (skb_headroom(skb) < needed_headroom &&
2599            pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2600                goto out_free_skb;
2601
2602        /* prepend radiotap information */
2603        ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2604                                         false);
2605
2606        skb_set_mac_header(skb, 0);
2607        skb->ip_summed = CHECKSUM_UNNECESSARY;
2608        skb->pkt_type = PACKET_OTHERHOST;
2609        skb->protocol = htons(ETH_P_802_2);
2610
2611        list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2612                if (!ieee80211_sdata_running(sdata))
2613                        continue;
2614
2615                if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2616                    !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2617                        continue;
2618
2619                if (prev_dev) {
2620                        skb2 = skb_clone(skb, GFP_ATOMIC);
2621                        if (skb2) {
2622                                skb2->dev = prev_dev;
2623                                netif_receive_skb(skb2);
2624                        }
2625                }
2626
2627                prev_dev = sdata->dev;
2628                sdata->dev->stats.rx_packets++;
2629                sdata->dev->stats.rx_bytes += skb->len;
2630        }
2631
2632        if (prev_dev) {
2633                skb->dev = prev_dev;
2634                netif_receive_skb(skb);
2635                return;
2636        }
2637
2638 out_free_skb:
2639        dev_kfree_skb(skb);
2640}
2641
2642static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2643                                         ieee80211_rx_result res)
2644{
2645        switch (res) {
2646        case RX_DROP_MONITOR:
2647                I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2648                if (rx->sta)
2649                        rx->sta->rx_dropped++;
2650                /* fall through */
2651        case RX_CONTINUE: {
2652                struct ieee80211_rate *rate = NULL;
2653                struct ieee80211_supported_band *sband;
2654                struct ieee80211_rx_status *status;
2655
2656                status = IEEE80211_SKB_RXCB((rx->skb));
2657
2658                sband = rx->local->hw.wiphy->bands[status->band];
2659                if (!(status->flag & RX_FLAG_HT))
2660                        rate = &sband->bitrates[status->rate_idx];
2661
2662                ieee80211_rx_cooked_monitor(rx, rate);
2663                break;
2664                }
2665        case RX_DROP_UNUSABLE:
2666                I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2667                if (rx->sta)
2668                        rx->sta->rx_dropped++;
2669                dev_kfree_skb(rx->skb);
2670                break;
2671        case RX_QUEUED:
2672                I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2673                break;
2674        }
2675}
2676
2677static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
2678{
2679        ieee80211_rx_result res = RX_DROP_MONITOR;
2680        struct sk_buff *skb;
2681
2682#define CALL_RXH(rxh)                   \
2683        do {                            \
2684                res = rxh(rx);          \
2685                if (res != RX_CONTINUE) \
2686                        goto rxh_next;  \
2687        } while (0);
2688
2689        spin_lock(&rx->local->rx_skb_queue.lock);
2690        if (rx->local->running_rx_handler)
2691                goto unlock;
2692
2693        rx->local->running_rx_handler = true;
2694
2695        while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2696                spin_unlock(&rx->local->rx_skb_queue.lock);
2697
2698                /*
2699                 * all the other fields are valid across frames
2700                 * that belong to an aMPDU since they are on the
2701                 * same TID from the same station
2702                 */
2703                rx->skb = skb;
2704
2705                CALL_RXH(ieee80211_rx_h_decrypt)
2706                CALL_RXH(ieee80211_rx_h_check_more_data)
2707                CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2708                CALL_RXH(ieee80211_rx_h_sta_process)
2709                CALL_RXH(ieee80211_rx_h_defragment)
2710                CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2711                /* must be after MMIC verify so header is counted in MPDU mic */
2712#ifdef CONFIG_MAC80211_MESH
2713                if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2714                        CALL_RXH(ieee80211_rx_h_mesh_fwding);
2715#endif
2716                CALL_RXH(ieee80211_rx_h_amsdu)
2717                CALL_RXH(ieee80211_rx_h_data)
2718                CALL_RXH(ieee80211_rx_h_ctrl);
2719                CALL_RXH(ieee80211_rx_h_mgmt_check)
2720                CALL_RXH(ieee80211_rx_h_action)
2721                CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2722                CALL_RXH(ieee80211_rx_h_action_return)
2723                CALL_RXH(ieee80211_rx_h_mgmt)
2724
2725 rxh_next:
2726                ieee80211_rx_handlers_result(rx, res);
2727                spin_lock(&rx->local->rx_skb_queue.lock);
2728#undef CALL_RXH
2729        }
2730
2731        rx->local->running_rx_handler = false;
2732
2733 unlock:
2734        spin_unlock(&rx->local->rx_skb_queue.lock);
2735}
2736
2737static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2738{
2739        ieee80211_rx_result res = RX_DROP_MONITOR;
2740
2741#define CALL_RXH(rxh)                   \
2742        do {                            \
2743                res = rxh(rx);          \
2744                if (res != RX_CONTINUE) \
2745                        goto rxh_next;  \
2746        } while (0);
2747
2748        CALL_RXH(ieee80211_rx_h_check)
2749
2750        ieee80211_rx_reorder_ampdu(rx);
2751
2752        ieee80211_rx_handlers(rx);
2753        return;
2754
2755 rxh_next:
2756        ieee80211_rx_handlers_result(rx, res);
2757
2758#undef CALL_RXH
2759}
2760
2761/*
2762 * This function makes calls into the RX path, therefore
2763 * it has to be invoked under RCU read lock.
2764 */
2765void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2766{
2767        struct ieee80211_rx_data rx = {
2768                .sta = sta,
2769                .sdata = sta->sdata,
2770                .local = sta->local,
2771                /* This is OK -- must be QoS data frame */
2772                .security_idx = tid,
2773                .seqno_idx = tid,
2774                .flags = 0,
2775        };
2776        struct tid_ampdu_rx *tid_agg_rx;
2777
2778        tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2779        if (!tid_agg_rx)
2780                return;
2781
2782        spin_lock(&tid_agg_rx->reorder_lock);
2783        ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx);
2784        spin_unlock(&tid_agg_rx->reorder_lock);
2785
2786        ieee80211_rx_handlers(&rx);
2787}
2788
2789/* main receive path */
2790
2791static int prepare_for_handlers(struct ieee80211_rx_data *rx,
2792                                struct ieee80211_hdr *hdr)
2793{
2794        struct ieee80211_sub_if_data *sdata = rx->sdata;
2795        struct sk_buff *skb = rx->skb;
2796        struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2797        u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2798        int multicast = is_multicast_ether_addr(hdr->addr1);
2799
2800        switch (sdata->vif.type) {
2801        case NL80211_IFTYPE_STATION:
2802                if (!bssid && !sdata->u.mgd.use_4addr)
2803                        return 0;
2804                if (!multicast &&
2805                    !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
2806                        if (!(sdata->dev->flags & IFF_PROMISC) ||
2807                            sdata->u.mgd.use_4addr)
2808                                return 0;
2809                        status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2810                }
2811                break;
2812        case NL80211_IFTYPE_ADHOC:
2813                if (!bssid)
2814                        return 0;
2815                if (ieee80211_is_beacon(hdr->frame_control)) {
2816                        return 1;
2817                } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2818                        return 0;
2819                } else if (!multicast &&
2820                           !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
2821                        if (!(sdata->dev->flags & IFF_PROMISC))
2822                                return 0;
2823                        status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2824                } else if (!rx->sta) {
2825                        int rate_idx;
2826                        if (status->flag & RX_FLAG_HT)
2827                                rate_idx = 0; /* TODO: HT rates */
2828                        else
2829                                rate_idx = status->rate_idx;
2830                        ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
2831                                                 BIT(rate_idx));
2832                }
2833                break;
2834        case NL80211_IFTYPE_MESH_POINT:
2835                if (!multicast &&
2836                    !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
2837                        if (!(sdata->dev->flags & IFF_PROMISC))
2838                                return 0;
2839
2840                        status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2841                }
2842                break;
2843        case NL80211_IFTYPE_AP_VLAN:
2844        case NL80211_IFTYPE_AP:
2845                if (!bssid) {
2846                        if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
2847                                return 0;
2848                } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
2849                        /*
2850                         * Accept public action frames even when the
2851                         * BSSID doesn't match, this is used for P2P
2852                         * and location updates. Note that mac80211
2853                         * itself never looks at these frames.
2854                         */
2855                        if (ieee80211_is_public_action(hdr, skb->len))
2856                                return 1;
2857                        if (!ieee80211_is_beacon(hdr->frame_control))
2858                                return 0;
2859                        status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2860                }
2861                break;
2862        case NL80211_IFTYPE_WDS:
2863                if (bssid || !ieee80211_is_data(hdr->frame_control))
2864                        return 0;
2865                if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
2866                        return 0;
2867                break;
2868        case NL80211_IFTYPE_P2P_DEVICE:
2869                if (!ieee80211_is_public_action(hdr, skb->len) &&
2870                    !ieee80211_is_probe_req(hdr->frame_control) &&
2871                    !ieee80211_is_probe_resp(hdr->frame_control) &&
2872                    !ieee80211_is_beacon(hdr->frame_control))
2873                        return 0;
2874                if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
2875                        status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2876                break;
2877        default:
2878                /* should never get here */
2879                WARN_ON_ONCE(1);
2880                break;
2881        }
2882
2883        return 1;
2884}
2885
2886/*
2887 * This function returns whether or not the SKB
2888 * was destined for RX processing or not, which,
2889 * if consume is true, is equivalent to whether
2890 * or not the skb was consumed.
2891 */
2892static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2893                                            struct sk_buff *skb, bool consume)
2894{
2895        struct ieee80211_local *local = rx->local;
2896        struct ieee80211_sub_if_data *sdata = rx->sdata;
2897        struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2898        struct ieee80211_hdr *hdr = (void *)skb->data;
2899        int prepares;
2900
2901        rx->skb = skb;
2902        status->rx_flags |= IEEE80211_RX_RA_MATCH;
2903        prepares = prepare_for_handlers(rx, hdr);
2904
2905        if (!prepares)
2906                return false;
2907
2908        if (!consume) {
2909                skb = skb_copy(skb, GFP_ATOMIC);
2910                if (!skb) {
2911                        if (net_ratelimit())
2912                                wiphy_debug(local->hw.wiphy,
2913                                        "failed to copy skb for %s\n",
2914                                        sdata->name);
2915                        return true;
2916                }
2917
2918                rx->skb = skb;
2919        }
2920
2921        ieee80211_invoke_rx_handlers(rx);
2922        return true;
2923}
2924
2925/*
2926 * This is the actual Rx frames handler. as it blongs to Rx path it must
2927 * be called with rcu_read_lock protection.
2928 */
2929static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2930                                         struct sk_buff *skb)
2931{
2932        struct ieee80211_local *local = hw_to_local(hw);
2933        struct ieee80211_sub_if_data *sdata;
2934        struct ieee80211_hdr *hdr;
2935        __le16 fc;
2936        struct ieee80211_rx_data rx;
2937        struct ieee80211_sub_if_data *prev;
2938        struct sta_info *sta, *tmp, *prev_sta;
2939        int err = 0;
2940
2941        fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
2942        memset(&rx, 0, sizeof(rx));
2943        rx.skb = skb;
2944        rx.local = local;
2945
2946        if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
2947                local->dot11ReceivedFragmentCount++;
2948
2949        if (ieee80211_is_mgmt(fc)) {
2950                /* drop frame if too short for header */
2951                if (skb->len < ieee80211_hdrlen(fc))
2952                        err = -ENOBUFS;
2953                else
2954                        err = skb_linearize(skb);
2955        } else {
2956                err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2957        }
2958
2959        if (err) {
2960                dev_kfree_skb(skb);
2961                return;
2962        }
2963
2964        hdr = (struct ieee80211_hdr *)skb->data;
2965        ieee80211_parse_qos(&rx);
2966        ieee80211_verify_alignment(&rx);
2967
2968        if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
2969                     ieee80211_is_beacon(hdr->frame_control)))
2970                ieee80211_scan_rx(local, skb);
2971
2972        if (ieee80211_is_data(fc)) {
2973                prev_sta = NULL;
2974
2975                for_each_sta_info(local, hdr->addr2, sta, tmp) {
2976                        if (!prev_sta) {
2977                                prev_sta = sta;
2978                                continue;
2979                        }
2980
2981                        rx.sta = prev_sta;
2982                        rx.sdata = prev_sta->sdata;
2983                        ieee80211_prepare_and_rx_handle(&rx, skb, false);
2984
2985                        prev_sta = sta;
2986                }
2987
2988                if (prev_sta) {
2989                        rx.sta = prev_sta;
2990                        rx.sdata = prev_sta->sdata;
2991
2992                        if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2993                                return;
2994                        goto out;
2995                }
2996        }
2997
2998        prev = NULL;
2999
3000        list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3001                if (!ieee80211_sdata_running(sdata))
3002                        continue;
3003
3004                if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3005                    sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3006                        continue;
3007
3008                /*
3009                 * frame is destined for this interface, but if it's
3010                 * not also for the previous one we handle that after
3011                 * the loop to avoid copying the SKB once too much
3012                 */
3013
3014                if (!prev) {
3015                        prev = sdata;
3016                        continue;
3017                }
3018
3019                rx.sta = sta_info_get_bss(prev, hdr->addr2);
3020                rx.sdata = prev;
3021                ieee80211_prepare_and_rx_handle(&rx, skb, false);
3022
3023                prev = sdata;
3024        }
3025
3026        if (prev) {
3027                rx.sta = sta_info_get_bss(prev, hdr->addr2);
3028                rx.sdata = prev;
3029
3030                if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3031                        return;
3032        }
3033
3034 out:
3035        dev_kfree_skb(skb);
3036}
3037
3038/*
3039 * This is the receive path handler. It is called by a low level driver when an
3040 * 802.11 MPDU is received from the hardware.
3041 */
3042void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3043{
3044        struct ieee80211_local *local = hw_to_local(hw);
3045        struct ieee80211_rate *rate = NULL;
3046        struct ieee80211_supported_band *sband;
3047        struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3048
3049        WARN_ON_ONCE(softirq_count() == 0);
3050
3051        if (WARN_ON(status->band < 0 ||
3052                    status->band >= IEEE80211_NUM_BANDS))
3053                goto drop;
3054
3055        sband = local->hw.wiphy->bands[status->band];
3056        if (WARN_ON(!sband))
3057                goto drop;
3058
3059        /*
3060         * If we're suspending, it is possible although not too likely
3061         * that we'd be receiving frames after having already partially
3062         * quiesced the stack. We can't process such frames then since
3063         * that might, for example, cause stations to be added or other
3064         * driver callbacks be invoked.
3065         */
3066        if (unlikely(local->quiescing || local->suspended))
3067                goto drop;
3068
3069        /* We might be during a HW reconfig, prevent Rx for the same reason */
3070        if (unlikely(local->in_reconfig))
3071                goto drop;
3072
3073        /*
3074         * The same happens when we're not even started,
3075         * but that's worth a warning.
3076         */
3077        if (WARN_ON(!local->started))
3078                goto drop;
3079
3080        if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3081                /*
3082                 * Validate the rate, unless a PLCP error means that
3083                 * we probably can't have a valid rate here anyway.
3084                 */
3085
3086                if (status->flag & RX_FLAG_HT) {
3087                        /*
3088                         * rate_idx is MCS index, which can be [0-76]
3089                         * as documented on:
3090                         *
3091                         * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3092                         *
3093                         * Anything else would be some sort of driver or
3094                         * hardware error. The driver should catch hardware
3095                         * errors.
3096                         */
3097                        if (WARN((status->rate_idx < 0 ||
3098                                 status->rate_idx > 76),
3099                                 "Rate marked as an HT rate but passed "
3100                                 "status->rate_idx is not "
3101                                 "an MCS index [0-76]: %d (0x%02x)\n",
3102                                 status->rate_idx,
3103                                 status->rate_idx))
3104                                goto drop;
3105                } else {
3106                        if (WARN_ON(status->rate_idx < 0 ||
3107                                    status->rate_idx >= sband->n_bitrates))
3108                                goto drop;
3109                        rate = &sband->bitrates[status->rate_idx];
3110                }
3111        }
3112
3113        status->rx_flags = 0;
3114
3115        /*
3116         * key references and virtual interfaces are protected using RCU
3117         * and this requires that we are in a read-side RCU section during
3118         * receive processing
3119         */
3120        rcu_read_lock();
3121
3122        /*
3123         * Frames with failed FCS/PLCP checksum are not returned,
3124         * all other frames are returned without radiotap header
3125         * if it was previously present.
3126         * Also, frames with less than 16 bytes are dropped.
3127         */
3128        skb = ieee80211_rx_monitor(local, skb, rate);
3129        if (!skb) {
3130                rcu_read_unlock();
3131                return;
3132        }
3133
3134        ieee80211_tpt_led_trig_rx(local,
3135                        ((struct ieee80211_hdr *)skb->data)->frame_control,
3136                        skb->len);
3137        __ieee80211_rx_handle_packet(hw, skb);
3138
3139        rcu_read_unlock();
3140
3141        return;
3142 drop:
3143        kfree_skb(skb);
3144}
3145EXPORT_SYMBOL(ieee80211_rx);
3146
3147/* This is a version of the rx handler that can be called from hard irq
3148 * context. Post the skb on the queue and schedule the tasklet */
3149void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3150{
3151        struct ieee80211_local *local = hw_to_local(hw);
3152
3153        BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3154
3155        skb->pkt_type = IEEE80211_RX_MSG;
3156        skb_queue_tail(&local->skb_queue, skb);
3157        tasklet_schedule(&local->tasklet);
3158}
3159EXPORT_SYMBOL(ieee80211_rx_irqsafe);
3160
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