linux/drivers/net/wireless/intersil/hostap/hostap_80211_rx.c
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   1#include <linux/etherdevice.h>
   2#include <linux/slab.h>
   3#include <linux/export.h>
   4#include <net/lib80211.h>
   5#include <linux/if_arp.h>
   6
   7#include "hostap_80211.h"
   8#include "hostap.h"
   9#include "hostap_ap.h"
  10
  11/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
  12/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
  13static unsigned char rfc1042_header[] =
  14{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
  15/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
  16static unsigned char bridge_tunnel_header[] =
  17{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
  18/* No encapsulation header if EtherType < 0x600 (=length) */
  19
  20void hostap_dump_rx_80211(const char *name, struct sk_buff *skb,
  21                          struct hostap_80211_rx_status *rx_stats)
  22{
  23        struct ieee80211_hdr *hdr;
  24        u16 fc;
  25
  26        hdr = (struct ieee80211_hdr *) skb->data;
  27
  28        printk(KERN_DEBUG "%s: RX signal=%d noise=%d rate=%d len=%d "
  29               "jiffies=%ld\n",
  30               name, rx_stats->signal, rx_stats->noise, rx_stats->rate,
  31               skb->len, jiffies);
  32
  33        if (skb->len < 2)
  34                return;
  35
  36        fc = le16_to_cpu(hdr->frame_control);
  37        printk(KERN_DEBUG "   FC=0x%04x (type=%d:%d)%s%s",
  38               fc, (fc & IEEE80211_FCTL_FTYPE) >> 2,
  39               (fc & IEEE80211_FCTL_STYPE) >> 4,
  40               fc & IEEE80211_FCTL_TODS ? " [ToDS]" : "",
  41               fc & IEEE80211_FCTL_FROMDS ? " [FromDS]" : "");
  42
  43        if (skb->len < IEEE80211_DATA_HDR3_LEN) {
  44                printk("\n");
  45                return;
  46        }
  47
  48        printk(" dur=0x%04x seq=0x%04x\n", le16_to_cpu(hdr->duration_id),
  49               le16_to_cpu(hdr->seq_ctrl));
  50
  51        printk(KERN_DEBUG "   A1=%pM", hdr->addr1);
  52        printk(" A2=%pM", hdr->addr2);
  53        printk(" A3=%pM", hdr->addr3);
  54        if (skb->len >= 30)
  55                printk(" A4=%pM", hdr->addr4);
  56        printk("\n");
  57}
  58
  59
  60/* Send RX frame to netif with 802.11 (and possible prism) header.
  61 * Called from hardware or software IRQ context. */
  62int prism2_rx_80211(struct net_device *dev, struct sk_buff *skb,
  63                    struct hostap_80211_rx_status *rx_stats, int type)
  64{
  65        struct hostap_interface *iface;
  66        local_info_t *local;
  67        int hdrlen, phdrlen, head_need, tail_need;
  68        u16 fc;
  69        int prism_header, ret;
  70        struct ieee80211_hdr *fhdr;
  71
  72        iface = netdev_priv(dev);
  73        local = iface->local;
  74
  75        if (dev->type == ARPHRD_IEEE80211_PRISM) {
  76                if (local->monitor_type == PRISM2_MONITOR_PRISM) {
  77                        prism_header = 1;
  78                        phdrlen = sizeof(struct linux_wlan_ng_prism_hdr);
  79                } else { /* local->monitor_type == PRISM2_MONITOR_CAPHDR */
  80                        prism_header = 2;
  81                        phdrlen = sizeof(struct linux_wlan_ng_cap_hdr);
  82                }
  83        } else if (dev->type == ARPHRD_IEEE80211_RADIOTAP) {
  84                prism_header = 3;
  85                phdrlen = sizeof(struct hostap_radiotap_rx);
  86        } else {
  87                prism_header = 0;
  88                phdrlen = 0;
  89        }
  90
  91        fhdr = (struct ieee80211_hdr *) skb->data;
  92        fc = le16_to_cpu(fhdr->frame_control);
  93
  94        if (type == PRISM2_RX_MGMT && (fc & IEEE80211_FCTL_VERS)) {
  95                printk(KERN_DEBUG "%s: dropped management frame with header "
  96                       "version %d\n", dev->name, fc & IEEE80211_FCTL_VERS);
  97                dev_kfree_skb_any(skb);
  98                return 0;
  99        }
 100
 101        hdrlen = hostap_80211_get_hdrlen(fhdr->frame_control);
 102
 103        /* check if there is enough room for extra data; if not, expand skb
 104         * buffer to be large enough for the changes */
 105        head_need = phdrlen;
 106        tail_need = 0;
 107#ifdef PRISM2_ADD_BOGUS_CRC
 108        tail_need += 4;
 109#endif /* PRISM2_ADD_BOGUS_CRC */
 110
 111        head_need -= skb_headroom(skb);
 112        tail_need -= skb_tailroom(skb);
 113
 114        if (head_need > 0 || tail_need > 0) {
 115                if (pskb_expand_head(skb, head_need > 0 ? head_need : 0,
 116                                     tail_need > 0 ? tail_need : 0,
 117                                     GFP_ATOMIC)) {
 118                        printk(KERN_DEBUG "%s: prism2_rx_80211 failed to "
 119                               "reallocate skb buffer\n", dev->name);
 120                        dev_kfree_skb_any(skb);
 121                        return 0;
 122                }
 123        }
 124
 125        /* We now have an skb with enough head and tail room, so just insert
 126         * the extra data */
 127
 128#ifdef PRISM2_ADD_BOGUS_CRC
 129        memset(skb_put(skb, 4), 0xff, 4); /* Prism2 strips CRC */
 130#endif /* PRISM2_ADD_BOGUS_CRC */
 131
 132        if (prism_header == 1) {
 133                struct linux_wlan_ng_prism_hdr *hdr;
 134                hdr = (struct linux_wlan_ng_prism_hdr *)
 135                        skb_push(skb, phdrlen);
 136                memset(hdr, 0, phdrlen);
 137                hdr->msgcode = LWNG_CAP_DID_BASE;
 138                hdr->msglen = sizeof(*hdr);
 139                memcpy(hdr->devname, dev->name, sizeof(hdr->devname));
 140#define LWNG_SETVAL(f,i,s,l,d) \
 141hdr->f.did = LWNG_CAP_DID_BASE | (i << 12); \
 142hdr->f.status = s; hdr->f.len = l; hdr->f.data = d
 143                LWNG_SETVAL(hosttime, 1, 0, 4, jiffies);
 144                LWNG_SETVAL(mactime, 2, 0, 4, rx_stats->mac_time);
 145                LWNG_SETVAL(channel, 3, 1 /* no value */, 4, 0);
 146                LWNG_SETVAL(rssi, 4, 1 /* no value */, 4, 0);
 147                LWNG_SETVAL(sq, 5, 1 /* no value */, 4, 0);
 148                LWNG_SETVAL(signal, 6, 0, 4, rx_stats->signal);
 149                LWNG_SETVAL(noise, 7, 0, 4, rx_stats->noise);
 150                LWNG_SETVAL(rate, 8, 0, 4, rx_stats->rate / 5);
 151                LWNG_SETVAL(istx, 9, 0, 4, 0);
 152                LWNG_SETVAL(frmlen, 10, 0, 4, skb->len - phdrlen);
 153#undef LWNG_SETVAL
 154        } else if (prism_header == 2) {
 155                struct linux_wlan_ng_cap_hdr *hdr;
 156                hdr = (struct linux_wlan_ng_cap_hdr *)
 157                        skb_push(skb, phdrlen);
 158                memset(hdr, 0, phdrlen);
 159                hdr->version    = htonl(LWNG_CAPHDR_VERSION);
 160                hdr->length     = htonl(phdrlen);
 161                hdr->mactime    = __cpu_to_be64(rx_stats->mac_time);
 162                hdr->hosttime   = __cpu_to_be64(jiffies);
 163                hdr->phytype    = htonl(4); /* dss_dot11_b */
 164                hdr->channel    = htonl(local->channel);
 165                hdr->datarate   = htonl(rx_stats->rate);
 166                hdr->antenna    = htonl(0); /* unknown */
 167                hdr->priority   = htonl(0); /* unknown */
 168                hdr->ssi_type   = htonl(3); /* raw */
 169                hdr->ssi_signal = htonl(rx_stats->signal);
 170                hdr->ssi_noise  = htonl(rx_stats->noise);
 171                hdr->preamble   = htonl(0); /* unknown */
 172                hdr->encoding   = htonl(1); /* cck */
 173        } else if (prism_header == 3) {
 174                struct hostap_radiotap_rx *hdr;
 175                hdr = (struct hostap_radiotap_rx *)skb_push(skb, phdrlen);
 176                memset(hdr, 0, phdrlen);
 177                hdr->hdr.it_len = cpu_to_le16(phdrlen);
 178                hdr->hdr.it_present =
 179                        cpu_to_le32((1 << IEEE80211_RADIOTAP_TSFT) |
 180                                    (1 << IEEE80211_RADIOTAP_CHANNEL) |
 181                                    (1 << IEEE80211_RADIOTAP_RATE) |
 182                                    (1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL) |
 183                                    (1 << IEEE80211_RADIOTAP_DBM_ANTNOISE));
 184                hdr->tsft = cpu_to_le64(rx_stats->mac_time);
 185                hdr->chan_freq = cpu_to_le16(freq_list[local->channel - 1]);
 186                hdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_CCK |
 187                                                 IEEE80211_CHAN_2GHZ);
 188                hdr->rate = rx_stats->rate / 5;
 189                hdr->dbm_antsignal = rx_stats->signal;
 190                hdr->dbm_antnoise = rx_stats->noise;
 191        }
 192
 193        ret = skb->len - phdrlen;
 194        skb->dev = dev;
 195        skb_reset_mac_header(skb);
 196        skb_pull(skb, hdrlen);
 197        if (prism_header)
 198                skb_pull(skb, phdrlen);
 199        skb->pkt_type = PACKET_OTHERHOST;
 200        skb->protocol = cpu_to_be16(ETH_P_802_2);
 201        memset(skb->cb, 0, sizeof(skb->cb));
 202        netif_rx(skb);
 203
 204        return ret;
 205}
 206
 207
 208/* Called only as a tasklet (software IRQ) */
 209static void monitor_rx(struct net_device *dev, struct sk_buff *skb,
 210                       struct hostap_80211_rx_status *rx_stats)
 211{
 212        int len;
 213
 214        len = prism2_rx_80211(dev, skb, rx_stats, PRISM2_RX_MONITOR);
 215        dev->stats.rx_packets++;
 216        dev->stats.rx_bytes += len;
 217}
 218
 219
 220/* Called only as a tasklet (software IRQ) */
 221static struct prism2_frag_entry *
 222prism2_frag_cache_find(local_info_t *local, unsigned int seq,
 223                       unsigned int frag, u8 *src, u8 *dst)
 224{
 225        struct prism2_frag_entry *entry;
 226        int i;
 227
 228        for (i = 0; i < PRISM2_FRAG_CACHE_LEN; i++) {
 229                entry = &local->frag_cache[i];
 230                if (entry->skb != NULL &&
 231                    time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
 232                        printk(KERN_DEBUG "%s: expiring fragment cache entry "
 233                               "seq=%u last_frag=%u\n",
 234                               local->dev->name, entry->seq, entry->last_frag);
 235                        dev_kfree_skb(entry->skb);
 236                        entry->skb = NULL;
 237                }
 238
 239                if (entry->skb != NULL && entry->seq == seq &&
 240                    (entry->last_frag + 1 == frag || frag == -1) &&
 241                    memcmp(entry->src_addr, src, ETH_ALEN) == 0 &&
 242                    memcmp(entry->dst_addr, dst, ETH_ALEN) == 0)
 243                        return entry;
 244        }
 245
 246        return NULL;
 247}
 248
 249
 250/* Called only as a tasklet (software IRQ) */
 251static struct sk_buff *
 252prism2_frag_cache_get(local_info_t *local, struct ieee80211_hdr *hdr)
 253{
 254        struct sk_buff *skb = NULL;
 255        u16 sc;
 256        unsigned int frag, seq;
 257        struct prism2_frag_entry *entry;
 258
 259        sc = le16_to_cpu(hdr->seq_ctrl);
 260        frag = sc & IEEE80211_SCTL_FRAG;
 261        seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
 262
 263        if (frag == 0) {
 264                /* Reserve enough space to fit maximum frame length */
 265                skb = dev_alloc_skb(local->dev->mtu +
 266                                    sizeof(struct ieee80211_hdr) +
 267                                    8 /* LLC */ +
 268                                    2 /* alignment */ +
 269                                    8 /* WEP */ + ETH_ALEN /* WDS */);
 270                if (skb == NULL)
 271                        return NULL;
 272
 273                entry = &local->frag_cache[local->frag_next_idx];
 274                local->frag_next_idx++;
 275                if (local->frag_next_idx >= PRISM2_FRAG_CACHE_LEN)
 276                        local->frag_next_idx = 0;
 277
 278                if (entry->skb != NULL)
 279                        dev_kfree_skb(entry->skb);
 280
 281                entry->first_frag_time = jiffies;
 282                entry->seq = seq;
 283                entry->last_frag = frag;
 284                entry->skb = skb;
 285                memcpy(entry->src_addr, hdr->addr2, ETH_ALEN);
 286                memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN);
 287        } else {
 288                /* received a fragment of a frame for which the head fragment
 289                 * should have already been received */
 290                entry = prism2_frag_cache_find(local, seq, frag, hdr->addr2,
 291                                               hdr->addr1);
 292                if (entry != NULL) {
 293                        entry->last_frag = frag;
 294                        skb = entry->skb;
 295                }
 296        }
 297
 298        return skb;
 299}
 300
 301
 302/* Called only as a tasklet (software IRQ) */
 303static int prism2_frag_cache_invalidate(local_info_t *local,
 304                                        struct ieee80211_hdr *hdr)
 305{
 306        u16 sc;
 307        unsigned int seq;
 308        struct prism2_frag_entry *entry;
 309
 310        sc = le16_to_cpu(hdr->seq_ctrl);
 311        seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
 312
 313        entry = prism2_frag_cache_find(local, seq, -1, hdr->addr2, hdr->addr1);
 314
 315        if (entry == NULL) {
 316                printk(KERN_DEBUG "%s: could not invalidate fragment cache "
 317                       "entry (seq=%u)\n",
 318                       local->dev->name, seq);
 319                return -1;
 320        }
 321
 322        entry->skb = NULL;
 323        return 0;
 324}
 325
 326
 327static struct hostap_bss_info *__hostap_get_bss(local_info_t *local, u8 *bssid,
 328                                                u8 *ssid, size_t ssid_len)
 329{
 330        struct list_head *ptr;
 331        struct hostap_bss_info *bss;
 332
 333        list_for_each(ptr, &local->bss_list) {
 334                bss = list_entry(ptr, struct hostap_bss_info, list);
 335                if (memcmp(bss->bssid, bssid, ETH_ALEN) == 0 &&
 336                    (ssid == NULL ||
 337                     (ssid_len == bss->ssid_len &&
 338                      memcmp(ssid, bss->ssid, ssid_len) == 0))) {
 339                        list_move(&bss->list, &local->bss_list);
 340                        return bss;
 341                }
 342        }
 343
 344        return NULL;
 345}
 346
 347
 348static struct hostap_bss_info *__hostap_add_bss(local_info_t *local, u8 *bssid,
 349                                                u8 *ssid, size_t ssid_len)
 350{
 351        struct hostap_bss_info *bss;
 352
 353        if (local->num_bss_info >= HOSTAP_MAX_BSS_COUNT) {
 354                bss = list_entry(local->bss_list.prev,
 355                                 struct hostap_bss_info, list);
 356                list_del(&bss->list);
 357                local->num_bss_info--;
 358        } else {
 359                bss = kmalloc(sizeof(*bss), GFP_ATOMIC);
 360                if (bss == NULL)
 361                        return NULL;
 362        }
 363
 364        memset(bss, 0, sizeof(*bss));
 365        memcpy(bss->bssid, bssid, ETH_ALEN);
 366        memcpy(bss->ssid, ssid, ssid_len);
 367        bss->ssid_len = ssid_len;
 368        local->num_bss_info++;
 369        list_add(&bss->list, &local->bss_list);
 370        return bss;
 371}
 372
 373
 374static void __hostap_expire_bss(local_info_t *local)
 375{
 376        struct hostap_bss_info *bss;
 377
 378        while (local->num_bss_info > 0) {
 379                bss = list_entry(local->bss_list.prev,
 380                                 struct hostap_bss_info, list);
 381                if (!time_after(jiffies, bss->last_update + 60 * HZ))
 382                        break;
 383
 384                list_del(&bss->list);
 385                local->num_bss_info--;
 386                kfree(bss);
 387        }
 388}
 389
 390
 391/* Both IEEE 802.11 Beacon and Probe Response frames have similar structure, so
 392 * the same routine can be used to parse both of them. */
 393static void hostap_rx_sta_beacon(local_info_t *local, struct sk_buff *skb,
 394                                 int stype)
 395{
 396        struct hostap_ieee80211_mgmt *mgmt;
 397        int left, chan = 0;
 398        u8 *pos;
 399        u8 *ssid = NULL, *wpa = NULL, *rsn = NULL;
 400        size_t ssid_len = 0, wpa_len = 0, rsn_len = 0;
 401        struct hostap_bss_info *bss;
 402
 403        if (skb->len < IEEE80211_MGMT_HDR_LEN + sizeof(mgmt->u.beacon))
 404                return;
 405
 406        mgmt = (struct hostap_ieee80211_mgmt *) skb->data;
 407        pos = mgmt->u.beacon.variable;
 408        left = skb->len - (pos - skb->data);
 409
 410        while (left >= 2) {
 411                if (2 + pos[1] > left)
 412                        return; /* parse failed */
 413                switch (*pos) {
 414                case WLAN_EID_SSID:
 415                        ssid = pos + 2;
 416                        ssid_len = pos[1];
 417                        break;
 418                case WLAN_EID_VENDOR_SPECIFIC:
 419                        if (pos[1] >= 4 &&
 420                            pos[2] == 0x00 && pos[3] == 0x50 &&
 421                            pos[4] == 0xf2 && pos[5] == 1) {
 422                                wpa = pos;
 423                                wpa_len = pos[1] + 2;
 424                        }
 425                        break;
 426                case WLAN_EID_RSN:
 427                        rsn = pos;
 428                        rsn_len = pos[1] + 2;
 429                        break;
 430                case WLAN_EID_DS_PARAMS:
 431                        if (pos[1] >= 1)
 432                                chan = pos[2];
 433                        break;
 434                }
 435                left -= 2 + pos[1];
 436                pos += 2 + pos[1];
 437        }
 438
 439        if (wpa_len > MAX_WPA_IE_LEN)
 440                wpa_len = MAX_WPA_IE_LEN;
 441        if (rsn_len > MAX_WPA_IE_LEN)
 442                rsn_len = MAX_WPA_IE_LEN;
 443        if (ssid_len > sizeof(bss->ssid))
 444                ssid_len = sizeof(bss->ssid);
 445
 446        spin_lock(&local->lock);
 447        bss = __hostap_get_bss(local, mgmt->bssid, ssid, ssid_len);
 448        if (bss == NULL)
 449                bss = __hostap_add_bss(local, mgmt->bssid, ssid, ssid_len);
 450        if (bss) {
 451                bss->last_update = jiffies;
 452                bss->count++;
 453                bss->capab_info = le16_to_cpu(mgmt->u.beacon.capab_info);
 454                if (wpa) {
 455                        memcpy(bss->wpa_ie, wpa, wpa_len);
 456                        bss->wpa_ie_len = wpa_len;
 457                } else
 458                        bss->wpa_ie_len = 0;
 459                if (rsn) {
 460                        memcpy(bss->rsn_ie, rsn, rsn_len);
 461                        bss->rsn_ie_len = rsn_len;
 462                } else
 463                        bss->rsn_ie_len = 0;
 464                bss->chan = chan;
 465        }
 466        __hostap_expire_bss(local);
 467        spin_unlock(&local->lock);
 468}
 469
 470
 471static int
 472hostap_rx_frame_mgmt(local_info_t *local, struct sk_buff *skb,
 473                     struct hostap_80211_rx_status *rx_stats, u16 type,
 474                     u16 stype)
 475{
 476        if (local->iw_mode == IW_MODE_MASTER)
 477                hostap_update_sta_ps(local, (struct ieee80211_hdr *) skb->data);
 478
 479        if (local->hostapd && type == IEEE80211_FTYPE_MGMT) {
 480                if (stype == IEEE80211_STYPE_BEACON &&
 481                    local->iw_mode == IW_MODE_MASTER) {
 482                        struct sk_buff *skb2;
 483                        /* Process beacon frames also in kernel driver to
 484                         * update STA(AP) table statistics */
 485                        skb2 = skb_clone(skb, GFP_ATOMIC);
 486                        if (skb2)
 487                                hostap_rx(skb2->dev, skb2, rx_stats);
 488                }
 489
 490                /* send management frames to the user space daemon for
 491                 * processing */
 492                local->apdevstats.rx_packets++;
 493                local->apdevstats.rx_bytes += skb->len;
 494                if (local->apdev == NULL)
 495                        return -1;
 496                prism2_rx_80211(local->apdev, skb, rx_stats, PRISM2_RX_MGMT);
 497                return 0;
 498        }
 499
 500        if (local->iw_mode == IW_MODE_MASTER) {
 501                if (type != IEEE80211_FTYPE_MGMT &&
 502                    type != IEEE80211_FTYPE_CTL) {
 503                        printk(KERN_DEBUG "%s: unknown management frame "
 504                               "(type=0x%02x, stype=0x%02x) dropped\n",
 505                               skb->dev->name, type >> 2, stype >> 4);
 506                        return -1;
 507                }
 508
 509                hostap_rx(skb->dev, skb, rx_stats);
 510                return 0;
 511        } else if (type == IEEE80211_FTYPE_MGMT &&
 512                   (stype == IEEE80211_STYPE_BEACON ||
 513                    stype == IEEE80211_STYPE_PROBE_RESP)) {
 514                hostap_rx_sta_beacon(local, skb, stype);
 515                return -1;
 516        } else if (type == IEEE80211_FTYPE_MGMT &&
 517                   (stype == IEEE80211_STYPE_ASSOC_RESP ||
 518                    stype == IEEE80211_STYPE_REASSOC_RESP)) {
 519                /* Ignore (Re)AssocResp silently since these are not currently
 520                 * needed but are still received when WPA/RSN mode is enabled.
 521                 */
 522                return -1;
 523        } else {
 524                printk(KERN_DEBUG "%s: hostap_rx_frame_mgmt: dropped unhandled"
 525                       " management frame in non-Host AP mode (type=%d:%d)\n",
 526                       skb->dev->name, type >> 2, stype >> 4);
 527                return -1;
 528        }
 529}
 530
 531
 532/* Called only as a tasklet (software IRQ) */
 533static struct net_device *prism2_rx_get_wds(local_info_t *local,
 534                                                   u8 *addr)
 535{
 536        struct hostap_interface *iface = NULL;
 537        struct list_head *ptr;
 538
 539        read_lock_bh(&local->iface_lock);
 540        list_for_each(ptr, &local->hostap_interfaces) {
 541                iface = list_entry(ptr, struct hostap_interface, list);
 542                if (iface->type == HOSTAP_INTERFACE_WDS &&
 543                    memcmp(iface->u.wds.remote_addr, addr, ETH_ALEN) == 0)
 544                        break;
 545                iface = NULL;
 546        }
 547        read_unlock_bh(&local->iface_lock);
 548
 549        return iface ? iface->dev : NULL;
 550}
 551
 552
 553static int
 554hostap_rx_frame_wds(local_info_t *local, struct ieee80211_hdr *hdr, u16 fc,
 555                    struct net_device **wds)
 556{
 557        /* FIX: is this really supposed to accept WDS frames only in Master
 558         * mode? What about Repeater or Managed with WDS frames? */
 559        if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) !=
 560            (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS) &&
 561            (local->iw_mode != IW_MODE_MASTER || !(fc & IEEE80211_FCTL_TODS)))
 562                return 0; /* not a WDS frame */
 563
 564        /* Possible WDS frame: either IEEE 802.11 compliant (if FromDS)
 565         * or own non-standard frame with 4th address after payload */
 566        if (!ether_addr_equal(hdr->addr1, local->dev->dev_addr) &&
 567            (hdr->addr1[0] != 0xff || hdr->addr1[1] != 0xff ||
 568             hdr->addr1[2] != 0xff || hdr->addr1[3] != 0xff ||
 569             hdr->addr1[4] != 0xff || hdr->addr1[5] != 0xff)) {
 570                /* RA (or BSSID) is not ours - drop */
 571                PDEBUG(DEBUG_EXTRA2, "%s: received WDS frame with "
 572                       "not own or broadcast %s=%pM\n",
 573                       local->dev->name,
 574                       fc & IEEE80211_FCTL_FROMDS ? "RA" : "BSSID",
 575                       hdr->addr1);
 576                return -1;
 577        }
 578
 579        /* check if the frame came from a registered WDS connection */
 580        *wds = prism2_rx_get_wds(local, hdr->addr2);
 581        if (*wds == NULL && fc & IEEE80211_FCTL_FROMDS &&
 582            (local->iw_mode != IW_MODE_INFRA ||
 583             !(local->wds_type & HOSTAP_WDS_AP_CLIENT) ||
 584             memcmp(hdr->addr2, local->bssid, ETH_ALEN) != 0)) {
 585                /* require that WDS link has been registered with TA or the
 586                 * frame is from current AP when using 'AP client mode' */
 587                PDEBUG(DEBUG_EXTRA, "%s: received WDS[4 addr] frame "
 588                       "from unknown TA=%pM\n",
 589                       local->dev->name, hdr->addr2);
 590                if (local->ap && local->ap->autom_ap_wds)
 591                        hostap_wds_link_oper(local, hdr->addr2, WDS_ADD);
 592                return -1;
 593        }
 594
 595        if (*wds && !(fc & IEEE80211_FCTL_FROMDS) && local->ap &&
 596            hostap_is_sta_assoc(local->ap, hdr->addr2)) {
 597                /* STA is actually associated with us even though it has a
 598                 * registered WDS link. Assume it is in 'AP client' mode.
 599                 * Since this is a 3-addr frame, assume it is not (bogus) WDS
 600                 * frame and process it like any normal ToDS frame from
 601                 * associated STA. */
 602                *wds = NULL;
 603        }
 604
 605        return 0;
 606}
 607
 608
 609static int hostap_is_eapol_frame(local_info_t *local, struct sk_buff *skb)
 610{
 611        struct net_device *dev = local->dev;
 612        u16 fc, ethertype;
 613        struct ieee80211_hdr *hdr;
 614        u8 *pos;
 615
 616        if (skb->len < 24)
 617                return 0;
 618
 619        hdr = (struct ieee80211_hdr *) skb->data;
 620        fc = le16_to_cpu(hdr->frame_control);
 621
 622        /* check that the frame is unicast frame to us */
 623        if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
 624            IEEE80211_FCTL_TODS &&
 625            ether_addr_equal(hdr->addr1, dev->dev_addr) &&
 626            ether_addr_equal(hdr->addr3, dev->dev_addr)) {
 627                /* ToDS frame with own addr BSSID and DA */
 628        } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
 629                   IEEE80211_FCTL_FROMDS &&
 630                   ether_addr_equal(hdr->addr1, dev->dev_addr)) {
 631                /* FromDS frame with own addr as DA */
 632        } else
 633                return 0;
 634
 635        if (skb->len < 24 + 8)
 636                return 0;
 637
 638        /* check for port access entity Ethernet type */
 639        pos = skb->data + 24;
 640        ethertype = (pos[6] << 8) | pos[7];
 641        if (ethertype == ETH_P_PAE)
 642                return 1;
 643
 644        return 0;
 645}
 646
 647
 648/* Called only as a tasklet (software IRQ) */
 649static int
 650hostap_rx_frame_decrypt(local_info_t *local, struct sk_buff *skb,
 651                        struct lib80211_crypt_data *crypt)
 652{
 653        struct ieee80211_hdr *hdr;
 654        int res, hdrlen;
 655
 656        if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)
 657                return 0;
 658
 659        hdr = (struct ieee80211_hdr *) skb->data;
 660        hdrlen = hostap_80211_get_hdrlen(hdr->frame_control);
 661
 662        if (local->tkip_countermeasures &&
 663            strcmp(crypt->ops->name, "TKIP") == 0) {
 664                if (net_ratelimit()) {
 665                        printk(KERN_DEBUG "%s: TKIP countermeasures: dropped "
 666                               "received packet from %pM\n",
 667                               local->dev->name, hdr->addr2);
 668                }
 669                return -1;
 670        }
 671
 672        atomic_inc(&crypt->refcnt);
 673        res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
 674        atomic_dec(&crypt->refcnt);
 675        if (res < 0) {
 676                printk(KERN_DEBUG "%s: decryption failed (SA=%pM) res=%d\n",
 677                       local->dev->name, hdr->addr2, res);
 678                local->comm_tallies.rx_discards_wep_undecryptable++;
 679                return -1;
 680        }
 681
 682        return res;
 683}
 684
 685
 686/* Called only as a tasklet (software IRQ) */
 687static int
 688hostap_rx_frame_decrypt_msdu(local_info_t *local, struct sk_buff *skb,
 689                             int keyidx, struct lib80211_crypt_data *crypt)
 690{
 691        struct ieee80211_hdr *hdr;
 692        int res, hdrlen;
 693
 694        if (crypt == NULL || crypt->ops->decrypt_msdu == NULL)
 695                return 0;
 696
 697        hdr = (struct ieee80211_hdr *) skb->data;
 698        hdrlen = hostap_80211_get_hdrlen(hdr->frame_control);
 699
 700        atomic_inc(&crypt->refcnt);
 701        res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);
 702        atomic_dec(&crypt->refcnt);
 703        if (res < 0) {
 704                printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed"
 705                       " (SA=%pM keyidx=%d)\n",
 706                       local->dev->name, hdr->addr2, keyidx);
 707                return -1;
 708        }
 709
 710        return 0;
 711}
 712
 713
 714/* All received frames are sent to this function. @skb contains the frame in
 715 * IEEE 802.11 format, i.e., in the format it was sent over air.
 716 * This function is called only as a tasklet (software IRQ). */
 717void hostap_80211_rx(struct net_device *dev, struct sk_buff *skb,
 718                     struct hostap_80211_rx_status *rx_stats)
 719{
 720        struct hostap_interface *iface;
 721        local_info_t *local;
 722        struct ieee80211_hdr *hdr;
 723        size_t hdrlen;
 724        u16 fc, type, stype, sc;
 725        struct net_device *wds = NULL;
 726        unsigned int frag;
 727        u8 *payload;
 728        struct sk_buff *skb2 = NULL;
 729        u16 ethertype;
 730        int frame_authorized = 0;
 731        int from_assoc_ap = 0;
 732        u8 dst[ETH_ALEN];
 733        u8 src[ETH_ALEN];
 734        struct lib80211_crypt_data *crypt = NULL;
 735        void *sta = NULL;
 736        int keyidx = 0;
 737
 738        iface = netdev_priv(dev);
 739        local = iface->local;
 740        iface->stats.rx_packets++;
 741        iface->stats.rx_bytes += skb->len;
 742
 743        /* dev is the master radio device; change this to be the default
 744         * virtual interface (this may be changed to WDS device below) */
 745        dev = local->ddev;
 746        iface = netdev_priv(dev);
 747
 748        hdr = (struct ieee80211_hdr *) skb->data;
 749
 750        if (skb->len < 10)
 751                goto rx_dropped;
 752
 753        fc = le16_to_cpu(hdr->frame_control);
 754        type = fc & IEEE80211_FCTL_FTYPE;
 755        stype = fc & IEEE80211_FCTL_STYPE;
 756        sc = le16_to_cpu(hdr->seq_ctrl);
 757        frag = sc & IEEE80211_SCTL_FRAG;
 758        hdrlen = hostap_80211_get_hdrlen(hdr->frame_control);
 759
 760        /* Put this code here so that we avoid duplicating it in all
 761         * Rx paths. - Jean II */
 762#ifdef IW_WIRELESS_SPY          /* defined in iw_handler.h */
 763        /* If spy monitoring on */
 764        if (iface->spy_data.spy_number > 0) {
 765                struct iw_quality wstats;
 766                wstats.level = rx_stats->signal;
 767                wstats.noise = rx_stats->noise;
 768                wstats.updated = IW_QUAL_LEVEL_UPDATED | IW_QUAL_NOISE_UPDATED
 769                        | IW_QUAL_QUAL_INVALID | IW_QUAL_DBM;
 770                /* Update spy records */
 771                wireless_spy_update(dev, hdr->addr2, &wstats);
 772        }
 773#endif /* IW_WIRELESS_SPY */
 774        hostap_update_rx_stats(local->ap, hdr, rx_stats);
 775
 776        if (local->iw_mode == IW_MODE_MONITOR) {
 777                monitor_rx(dev, skb, rx_stats);
 778                return;
 779        }
 780
 781        if (local->host_decrypt) {
 782                int idx = 0;
 783                if (skb->len >= hdrlen + 3)
 784                        idx = skb->data[hdrlen + 3] >> 6;
 785                crypt = local->crypt_info.crypt[idx];
 786                sta = NULL;
 787
 788                /* Use station specific key to override default keys if the
 789                 * receiver address is a unicast address ("individual RA"). If
 790                 * bcrx_sta_key parameter is set, station specific key is used
 791                 * even with broad/multicast targets (this is against IEEE
 792                 * 802.11, but makes it easier to use different keys with
 793                 * stations that do not support WEP key mapping). */
 794
 795                if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key)
 796                        (void) hostap_handle_sta_crypto(local, hdr, &crypt,
 797                                                        &sta);
 798
 799                /* allow NULL decrypt to indicate an station specific override
 800                 * for default encryption */
 801                if (crypt && (crypt->ops == NULL ||
 802                              crypt->ops->decrypt_mpdu == NULL))
 803                        crypt = NULL;
 804
 805                if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) {
 806#if 0
 807                        /* This seems to be triggered by some (multicast?)
 808                         * frames from other than current BSS, so just drop the
 809                         * frames silently instead of filling system log with
 810                         * these reports. */
 811                        printk(KERN_DEBUG "%s: WEP decryption failed (not set)"
 812                               " (SA=%pM)\n",
 813                               local->dev->name, hdr->addr2);
 814#endif
 815                        local->comm_tallies.rx_discards_wep_undecryptable++;
 816                        goto rx_dropped;
 817                }
 818        }
 819
 820        if (type != IEEE80211_FTYPE_DATA) {
 821                if (type == IEEE80211_FTYPE_MGMT &&
 822                    stype == IEEE80211_STYPE_AUTH &&
 823                    fc & IEEE80211_FCTL_PROTECTED && local->host_decrypt &&
 824                    (keyidx = hostap_rx_frame_decrypt(local, skb, crypt)) < 0)
 825                {
 826                        printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth "
 827                               "from %pM\n", dev->name, hdr->addr2);
 828                        /* TODO: could inform hostapd about this so that it
 829                         * could send auth failure report */
 830                        goto rx_dropped;
 831                }
 832
 833                if (hostap_rx_frame_mgmt(local, skb, rx_stats, type, stype))
 834                        goto rx_dropped;
 835                else
 836                        goto rx_exit;
 837        }
 838
 839        /* Data frame - extract src/dst addresses */
 840        if (skb->len < IEEE80211_DATA_HDR3_LEN)
 841                goto rx_dropped;
 842
 843        switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
 844        case IEEE80211_FCTL_FROMDS:
 845                memcpy(dst, hdr->addr1, ETH_ALEN);
 846                memcpy(src, hdr->addr3, ETH_ALEN);
 847                break;
 848        case IEEE80211_FCTL_TODS:
 849                memcpy(dst, hdr->addr3, ETH_ALEN);
 850                memcpy(src, hdr->addr2, ETH_ALEN);
 851                break;
 852        case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
 853                if (skb->len < IEEE80211_DATA_HDR4_LEN)
 854                        goto rx_dropped;
 855                memcpy(dst, hdr->addr3, ETH_ALEN);
 856                memcpy(src, hdr->addr4, ETH_ALEN);
 857                break;
 858        case 0:
 859                memcpy(dst, hdr->addr1, ETH_ALEN);
 860                memcpy(src, hdr->addr2, ETH_ALEN);
 861                break;
 862        }
 863
 864        if (hostap_rx_frame_wds(local, hdr, fc, &wds))
 865                goto rx_dropped;
 866        if (wds)
 867                skb->dev = dev = wds;
 868
 869        if (local->iw_mode == IW_MODE_MASTER && !wds &&
 870            (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
 871            IEEE80211_FCTL_FROMDS &&
 872            local->stadev &&
 873            memcmp(hdr->addr2, local->assoc_ap_addr, ETH_ALEN) == 0) {
 874                /* Frame from BSSID of the AP for which we are a client */
 875                skb->dev = dev = local->stadev;
 876                from_assoc_ap = 1;
 877        }
 878
 879        if ((local->iw_mode == IW_MODE_MASTER ||
 880             local->iw_mode == IW_MODE_REPEAT) &&
 881            !from_assoc_ap) {
 882                switch (hostap_handle_sta_rx(local, dev, skb, rx_stats,
 883                                             wds != NULL)) {
 884                case AP_RX_CONTINUE_NOT_AUTHORIZED:
 885                        frame_authorized = 0;
 886                        break;
 887                case AP_RX_CONTINUE:
 888                        frame_authorized = 1;
 889                        break;
 890                case AP_RX_DROP:
 891                        goto rx_dropped;
 892                case AP_RX_EXIT:
 893                        goto rx_exit;
 894                }
 895        }
 896
 897        /* Nullfunc frames may have PS-bit set, so they must be passed to
 898         * hostap_handle_sta_rx() before being dropped here. */
 899        if (stype != IEEE80211_STYPE_DATA &&
 900            stype != IEEE80211_STYPE_DATA_CFACK &&
 901            stype != IEEE80211_STYPE_DATA_CFPOLL &&
 902            stype != IEEE80211_STYPE_DATA_CFACKPOLL) {
 903                if (stype != IEEE80211_STYPE_NULLFUNC)
 904                        printk(KERN_DEBUG "%s: RX: dropped data frame "
 905                               "with no data (type=0x%02x, subtype=0x%02x)\n",
 906                               dev->name, type >> 2, stype >> 4);
 907                goto rx_dropped;
 908        }
 909
 910        /* skb: hdr + (possibly fragmented, possibly encrypted) payload */
 911
 912        if (local->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
 913            (keyidx = hostap_rx_frame_decrypt(local, skb, crypt)) < 0)
 914                goto rx_dropped;
 915        hdr = (struct ieee80211_hdr *) skb->data;
 916
 917        /* skb: hdr + (possibly fragmented) plaintext payload */
 918
 919        if (local->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
 920            (frag != 0 || (fc & IEEE80211_FCTL_MOREFRAGS))) {
 921                int flen;
 922                struct sk_buff *frag_skb =
 923                        prism2_frag_cache_get(local, hdr);
 924                if (!frag_skb) {
 925                        printk(KERN_DEBUG "%s: Rx cannot get skb from "
 926                               "fragment cache (morefrag=%d seq=%u frag=%u)\n",
 927                               dev->name, (fc & IEEE80211_FCTL_MOREFRAGS) != 0,
 928                               (sc & IEEE80211_SCTL_SEQ) >> 4, frag);
 929                        goto rx_dropped;
 930                }
 931
 932                flen = skb->len;
 933                if (frag != 0)
 934                        flen -= hdrlen;
 935
 936                if (frag_skb->tail + flen > frag_skb->end) {
 937                        printk(KERN_WARNING "%s: host decrypted and "
 938                               "reassembled frame did not fit skb\n",
 939                               dev->name);
 940                        prism2_frag_cache_invalidate(local, hdr);
 941                        goto rx_dropped;
 942                }
 943
 944                if (frag == 0) {
 945                        /* copy first fragment (including full headers) into
 946                         * beginning of the fragment cache skb */
 947                        skb_copy_from_linear_data(skb, skb_put(frag_skb, flen),
 948                                                  flen);
 949                } else {
 950                        /* append frame payload to the end of the fragment
 951                         * cache skb */
 952                        skb_copy_from_linear_data_offset(skb, hdrlen,
 953                                                         skb_put(frag_skb,
 954                                                                 flen), flen);
 955                }
 956                dev_kfree_skb(skb);
 957                skb = NULL;
 958
 959                if (fc & IEEE80211_FCTL_MOREFRAGS) {
 960                        /* more fragments expected - leave the skb in fragment
 961                         * cache for now; it will be delivered to upper layers
 962                         * after all fragments have been received */
 963                        goto rx_exit;
 964                }
 965
 966                /* this was the last fragment and the frame will be
 967                 * delivered, so remove skb from fragment cache */
 968                skb = frag_skb;
 969                hdr = (struct ieee80211_hdr *) skb->data;
 970                prism2_frag_cache_invalidate(local, hdr);
 971        }
 972
 973        /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
 974         * encrypted/authenticated */
 975
 976        if (local->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
 977            hostap_rx_frame_decrypt_msdu(local, skb, keyidx, crypt))
 978                goto rx_dropped;
 979
 980        hdr = (struct ieee80211_hdr *) skb->data;
 981        if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !local->open_wep) {
 982                if (local->ieee_802_1x &&
 983                    hostap_is_eapol_frame(local, skb)) {
 984                        /* pass unencrypted EAPOL frames even if encryption is
 985                         * configured */
 986                        PDEBUG(DEBUG_EXTRA2, "%s: RX: IEEE 802.1X - passing "
 987                               "unencrypted EAPOL frame\n", local->dev->name);
 988                } else {
 989                        printk(KERN_DEBUG "%s: encryption configured, but RX "
 990                               "frame not encrypted (SA=%pM)\n",
 991                               local->dev->name, hdr->addr2);
 992                        goto rx_dropped;
 993                }
 994        }
 995
 996        if (local->drop_unencrypted && !(fc & IEEE80211_FCTL_PROTECTED) &&
 997            !hostap_is_eapol_frame(local, skb)) {
 998                if (net_ratelimit()) {
 999                        printk(KERN_DEBUG "%s: dropped unencrypted RX data "
1000                               "frame from %pM (drop_unencrypted=1)\n",
1001                               dev->name, hdr->addr2);
1002                }
1003                goto rx_dropped;
1004        }
1005
1006        /* skb: hdr + (possible reassembled) full plaintext payload */
1007
1008        payload = skb->data + hdrlen;
1009        ethertype = (payload[6] << 8) | payload[7];
1010
1011        /* If IEEE 802.1X is used, check whether the port is authorized to send
1012         * the received frame. */
1013        if (local->ieee_802_1x && local->iw_mode == IW_MODE_MASTER) {
1014                if (ethertype == ETH_P_PAE) {
1015                        PDEBUG(DEBUG_EXTRA2, "%s: RX: IEEE 802.1X frame\n",
1016                               dev->name);
1017                        if (local->hostapd && local->apdev) {
1018                                /* Send IEEE 802.1X frames to the user
1019                                 * space daemon for processing */
1020                                prism2_rx_80211(local->apdev, skb, rx_stats,
1021                                                PRISM2_RX_MGMT);
1022                                local->apdevstats.rx_packets++;
1023                                local->apdevstats.rx_bytes += skb->len;
1024                                goto rx_exit;
1025                        }
1026                } else if (!frame_authorized) {
1027                        printk(KERN_DEBUG "%s: dropped frame from "
1028                               "unauthorized port (IEEE 802.1X): "
1029                               "ethertype=0x%04x\n",
1030                               dev->name, ethertype);
1031                        goto rx_dropped;
1032                }
1033        }
1034
1035        /* convert hdr + possible LLC headers into Ethernet header */
1036        if (skb->len - hdrlen >= 8 &&
1037            ((memcmp(payload, rfc1042_header, 6) == 0 &&
1038              ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1039             memcmp(payload, bridge_tunnel_header, 6) == 0)) {
1040                /* remove RFC1042 or Bridge-Tunnel encapsulation and
1041                 * replace EtherType */
1042                skb_pull(skb, hdrlen + 6);
1043                memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1044                memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1045        } else {
1046                __be16 len;
1047                /* Leave Ethernet header part of hdr and full payload */
1048                skb_pull(skb, hdrlen);
1049                len = htons(skb->len);
1050                memcpy(skb_push(skb, 2), &len, 2);
1051                memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1052                memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1053        }
1054
1055        if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
1056                    IEEE80211_FCTL_TODS) &&
1057            skb->len >= ETH_HLEN + ETH_ALEN) {
1058                /* Non-standard frame: get addr4 from its bogus location after
1059                 * the payload */
1060                skb_copy_from_linear_data_offset(skb, skb->len - ETH_ALEN,
1061                                                 skb->data + ETH_ALEN,
1062                                                 ETH_ALEN);
1063                skb_trim(skb, skb->len - ETH_ALEN);
1064        }
1065
1066        dev->stats.rx_packets++;
1067        dev->stats.rx_bytes += skb->len;
1068
1069        if (local->iw_mode == IW_MODE_MASTER && !wds &&
1070            local->ap->bridge_packets) {
1071                if (dst[0] & 0x01) {
1072                        /* copy multicast frame both to the higher layers and
1073                         * to the wireless media */
1074                        local->ap->bridged_multicast++;
1075                        skb2 = skb_clone(skb, GFP_ATOMIC);
1076                        if (skb2 == NULL)
1077                                printk(KERN_DEBUG "%s: skb_clone failed for "
1078                                       "multicast frame\n", dev->name);
1079                } else if (hostap_is_sta_authorized(local->ap, dst)) {
1080                        /* send frame directly to the associated STA using
1081                         * wireless media and not passing to higher layers */
1082                        local->ap->bridged_unicast++;
1083                        skb2 = skb;
1084                        skb = NULL;
1085                }
1086        }
1087
1088        if (skb2 != NULL) {
1089                /* send to wireless media */
1090                skb2->dev = dev;
1091                skb2->protocol = cpu_to_be16(ETH_P_802_3);
1092                skb_reset_mac_header(skb2);
1093                skb_reset_network_header(skb2);
1094                /* skb2->network_header += ETH_HLEN; */
1095                dev_queue_xmit(skb2);
1096        }
1097
1098        if (skb) {
1099                skb->protocol = eth_type_trans(skb, dev);
1100                memset(skb->cb, 0, sizeof(skb->cb));
1101                netif_rx(skb);
1102        }
1103
1104 rx_exit:
1105        if (sta)
1106                hostap_handle_sta_release(sta);
1107        return;
1108
1109 rx_dropped:
1110        dev_kfree_skb(skb);
1111
1112        dev->stats.rx_dropped++;
1113        goto rx_exit;
1114}
1115
1116
1117EXPORT_SYMBOL(hostap_80211_rx);
1118