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