git.oblomov.eu Git - linux-2.6/blob - drivers/net/wireless/hostap/hostap_80211_rx.c

   1 #include <linux/etherdevice.h>
   2 #include <net/ieee80211_crypt.h>
   3
   4 #include "hostap_80211.h"
   5 #include "hostap.h"
   6 #include "hostap_ap.h"
   7
   8 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
   9 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
  10 static unsigned char rfc1042_header[] =
  11 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
  12 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
  13 static unsigned char bridge_tunnel_header[] =
  14 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
  15 /* No encapsulation header if EtherType < 0x600 (=length) */
  16
  17 void hostap_dump_rx_80211(const char *name, struct sk_buff *skb,
  18                           struct hostap_80211_rx_status *rx_stats)
  19 {
  20         struct ieee80211_hdr_4addr *hdr;
  21         u16 fc;
  22         DECLARE_MAC_BUF(mac);
  23
  24         hdr = (struct ieee80211_hdr_4addr *) skb->data;
  25
  26         printk(KERN_DEBUG "%s: RX signal=%d noise=%d rate=%d len=%d "
  27                "jiffies=%ld\n",
  28                name, rx_stats->signal, rx_stats->noise, rx_stats->rate,
  29                skb->len, jiffies);
  30
  31         if (skb->len < 2)
  32                 return;
  33
  34         fc = le16_to_cpu(hdr->frame_ctl);
  35         printk(KERN_DEBUG "   FC=0x%04x (type=%d:%d)%s%s",
  36                fc, WLAN_FC_GET_TYPE(fc) >> 2, WLAN_FC_GET_STYPE(fc) >> 4,
  37                fc & IEEE80211_FCTL_TODS ? " [ToDS]" : "",
  38                fc & IEEE80211_FCTL_FROMDS ? " [FromDS]" : "");
  39
  40         if (skb->len < IEEE80211_DATA_HDR3_LEN) {
  41                 printk("\n");
  42                 return;
  43         }
  44
  45         printk(" dur=0x%04x seq=0x%04x\n", le16_to_cpu(hdr->duration_id),
  46                le16_to_cpu(hdr->seq_ctl));
  47
  48         printk(KERN_DEBUG "   A1=%s", print_mac(mac, hdr->addr1));
  49         printk(" A2=%s", print_mac(mac, hdr->addr2));
  50         printk(" A3=%s", print_mac(mac, hdr->addr3));
  51         if (skb->len >= 30)
  52                 printk(" A4=%s", print_mac(mac, hdr->addr4));
  53         printk("\n");
  54 }
  55
  56
  57 /* Send RX frame to netif with 802.11 (and possible prism) header.
  58  * Called from hardware or software IRQ context. */
  59 int prism2_rx_80211(struct net_device *dev, struct sk_buff *skb,
  60                     struct hostap_80211_rx_status *rx_stats, int type)
  61 {
  62         struct hostap_interface *iface;
  63         local_info_t *local;
  64         int hdrlen, phdrlen, head_need, tail_need;
  65         u16 fc;
  66         int prism_header, ret;
  67         struct ieee80211_hdr_4addr *fhdr;
  68
  69         iface = netdev_priv(dev);
  70         local = iface->local;
  71         dev->last_rx = jiffies;
  72
  73         if (dev->type == ARPHRD_IEEE80211_PRISM) {
  74                 if (local->monitor_type == PRISM2_MONITOR_PRISM) {
  75                         prism_header = 1;
  76                         phdrlen = sizeof(struct linux_wlan_ng_prism_hdr);
  77                 } else { /* local->monitor_type == PRISM2_MONITOR_CAPHDR */
  78                         prism_header = 2;
  79                         phdrlen = sizeof(struct linux_wlan_ng_cap_hdr);
  80                 }
  81         } else if (dev->type == ARPHRD_IEEE80211_RADIOTAP) {
  82                 prism_header = 3;
  83                 phdrlen = sizeof(struct hostap_radiotap_rx);
  84         } else {
  85                 prism_header = 0;
  86                 phdrlen = 0;
  87         }
  88
  89         fhdr = (struct ieee80211_hdr_4addr *) skb->data;
  90         fc = le16_to_cpu(fhdr->frame_ctl);
  91
  92         if (type == PRISM2_RX_MGMT && (fc & IEEE80211_FCTL_VERS)) {
  93                 printk(KERN_DEBUG "%s: dropped management frame with header "
  94                        "version %d\n", dev->name, fc & IEEE80211_FCTL_VERS);
  95                 dev_kfree_skb_any(skb);
  96                 return 0;
  97         }
  98
  99         hdrlen = hostap_80211_get_hdrlen(fc);
 100
 101         /* check if there is enough room for extra data; if not, expand skb
 102          * buffer to be large enough for the changes */
 103         head_need = phdrlen;
 104         tail_need = 0;
 105 #ifdef PRISM2_ADD_BOGUS_CRC
 106         tail_need += 4;
 107 #endif /* PRISM2_ADD_BOGUS_CRC */
 108
 109         head_need -= skb_headroom(skb);
 110         tail_need -= skb_tailroom(skb);
 111
 112         if (head_need > 0 || tail_need > 0) {
 113                 if (pskb_expand_head(skb, head_need > 0 ? head_need : 0,
 114                                      tail_need > 0 ? tail_need : 0,
 115                                      GFP_ATOMIC)) {
 116                         printk(KERN_DEBUG "%s: prism2_rx_80211 failed to "
 117                                "reallocate skb buffer\n", dev->name);
 118                         dev_kfree_skb_any(skb);
 119                         return 0;
 120                 }
 121         }
 122
 123         /* We now have an skb with enough head and tail room, so just insert
 124          * the extra data */
 125
 126 #ifdef PRISM2_ADD_BOGUS_CRC
 127         memset(skb_put(skb, 4), 0xff, 4); /* Prism2 strips CRC */
 128 #endif /* PRISM2_ADD_BOGUS_CRC */
 129
 130         if (prism_header == 1) {
 131                 struct linux_wlan_ng_prism_hdr *hdr;
 132                 hdr = (struct linux_wlan_ng_prism_hdr *)
 133                         skb_push(skb, phdrlen);
 134                 memset(hdr, 0, phdrlen);
 135                 hdr->msgcode = LWNG_CAP_DID_BASE;
 136                 hdr->msglen = sizeof(*hdr);
 137                 memcpy(hdr->devname, dev->name, sizeof(hdr->devname));
 138 #define LWNG_SETVAL(f,i,s,l,d) \
 139 hdr->f.did = LWNG_CAP_DID_BASE | (i << 12); \
 140 hdr->f.status = s; hdr->f.len = l; hdr->f.data = d
 141                 LWNG_SETVAL(hosttime, 1, 0, 4, jiffies);
 142                 LWNG_SETVAL(mactime, 2, 0, 4, rx_stats->mac_time);
 143                 LWNG_SETVAL(channel, 3, 1 /* no value */, 4, 0);
 144                 LWNG_SETVAL(rssi, 4, 1 /* no value */, 4, 0);
 145                 LWNG_SETVAL(sq, 5, 1 /* no value */, 4, 0);
 146                 LWNG_SETVAL(signal, 6, 0, 4, rx_stats->signal);
 147                 LWNG_SETVAL(noise, 7, 0, 4, rx_stats->noise);
 148                 LWNG_SETVAL(rate, 8, 0, 4, rx_stats->rate / 5);
 149                 LWNG_SETVAL(istx, 9, 0, 4, 0);
 150                 LWNG_SETVAL(frmlen, 10, 0, 4, skb->len - phdrlen);
 151 #undef LWNG_SETVAL
 152         } else if (prism_header == 2) {
 153                 struct linux_wlan_ng_cap_hdr *hdr;
 154                 hdr = (struct linux_wlan_ng_cap_hdr *)
 155                         skb_push(skb, phdrlen);
 156                 memset(hdr, 0, phdrlen);
 157                 hdr->version    = htonl(LWNG_CAPHDR_VERSION);
 158                 hdr->length     = htonl(phdrlen);
 159                 hdr->mactime    = __cpu_to_be64(rx_stats->mac_time);
 160                 hdr->hosttime   = __cpu_to_be64(jiffies);
 161                 hdr->phytype    = htonl(4); /* dss_dot11_b */
 162                 hdr->channel    = htonl(local->channel);
 163                 hdr->datarate   = htonl(rx_stats->rate);
 164                 hdr->antenna    = htonl(0); /* unknown */
 165                 hdr->priority   = htonl(0); /* unknown */
 166                 hdr->ssi_type   = htonl(3); /* raw */
 167                 hdr->ssi_signal = htonl(rx_stats->signal);
 168                 hdr->ssi_noise  = htonl(rx_stats->noise);
 169                 hdr->preamble   = htonl(0); /* unknown */
 170                 hdr->encoding   = htonl(1); /* cck */
 171         } else if (prism_header == 3) {
 172                 struct hostap_radiotap_rx *hdr;
 173                 hdr = (struct hostap_radiotap_rx *)skb_push(skb, phdrlen);
 174                 memset(hdr, 0, phdrlen);
 175                 hdr->hdr.it_len = cpu_to_le16(phdrlen);
 176                 hdr->hdr.it_present =
 177                         cpu_to_le32((1 << IEEE80211_RADIOTAP_TSFT) |
 178                                     (1 << IEEE80211_RADIOTAP_CHANNEL) |
 179                                     (1 << IEEE80211_RADIOTAP_RATE) |
 180                                     (1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL) |
 181                                     (1 << IEEE80211_RADIOTAP_DBM_ANTNOISE));
 182                 hdr->tsft = cpu_to_le64(rx_stats->mac_time);
 183                 hdr->chan_freq = cpu_to_le16(freq_list[local->channel - 1]);
 184                 hdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_CCK |
 185                                                  IEEE80211_CHAN_2GHZ);
 186                 hdr->rate = rx_stats->rate / 5;
 187                 hdr->dbm_antsignal = rx_stats->signal;
 188                 hdr->dbm_antnoise = rx_stats->noise;
 189         }
 190
 191         ret = skb->len - phdrlen;
 192         skb->dev = dev;
 193         skb_reset_mac_header(skb);
 194         skb_pull(skb, hdrlen);
 195         if (prism_header)
 196                 skb_pull(skb, phdrlen);
 197         skb->pkt_type = PACKET_OTHERHOST;
 198         skb->protocol = __constant_htons(ETH_P_802_2);
 199         memset(skb->cb, 0, sizeof(skb->cb));
 200         netif_rx(skb);
 201
 202         return ret;
 203 }
 204
 205
 206 /* Called only as a tasklet (software IRQ) */
 207 static void monitor_rx(struct net_device *dev, struct sk_buff *skb,
 208                        struct hostap_80211_rx_status *rx_stats)
 209 {
 210         struct net_device_stats *stats;
 211         int len;
 212
 213         len = prism2_rx_80211(dev, skb, rx_stats, PRISM2_RX_MONITOR);
 214         stats = hostap_get_stats(dev);
 215         stats->rx_packets++;
 216         stats->rx_bytes += len;
 217 }
 218
 219
 220 /* Called only as a tasklet (software IRQ) */
 221 static struct prism2_frag_entry *
 222 prism2_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) */
 251 static struct sk_buff *
 252 prism2_frag_cache_get(local_info_t *local, struct ieee80211_hdr_4addr *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_ctl);
 260         frag = WLAN_GET_SEQ_FRAG(sc);
 261         seq = WLAN_GET_SEQ_SEQ(sc) >> 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_4addr) +
 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) */
 303 static int prism2_frag_cache_invalidate(local_info_t *local,
 304                                         struct ieee80211_hdr_4addr *hdr)
 305 {
 306         u16 sc;
 307         unsigned int seq;
 308         struct prism2_frag_entry *entry;
 309
 310         sc = le16_to_cpu(hdr->seq_ctl);
 311         seq = WLAN_GET_SEQ_SEQ(sc) >> 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
 327 static 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
 348 static 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 = (struct hostap_bss_info *)
 360                         kmalloc(sizeof(*bss), GFP_ATOMIC);
 361                 if (bss == NULL)
 362                         return NULL;
 363         }
 364
 365         memset(bss, 0, sizeof(*bss));
 366         memcpy(bss->bssid, bssid, ETH_ALEN);
 367         memcpy(bss->ssid, ssid, ssid_len);
 368         bss->ssid_len = ssid_len;
 369         local->num_bss_info++;
 370         list_add(&bss->list, &local->bss_list);
 371         return bss;
 372 }
 373
 374
 375 static void __hostap_expire_bss(local_info_t *local)
 376 {
 377         struct hostap_bss_info *bss;
 378
 379         while (local->num_bss_info > 0) {
 380                 bss = list_entry(local->bss_list.prev,
 381                                  struct hostap_bss_info, list);
 382                 if (!time_after(jiffies, bss->last_update + 60 * HZ))
 383                         break;
 384
 385                 list_del(&bss->list);
 386                 local->num_bss_info--;
 387                 kfree(bss);
 388         }
 389 }
 390
 391
 392 /* Both IEEE 802.11 Beacon and Probe Response frames have similar structure, so
 393  * the same routine can be used to parse both of them. */
 394 static void hostap_rx_sta_beacon(local_info_t *local, struct sk_buff *skb,
 395                                  int stype)
 396 {
 397         struct hostap_ieee80211_mgmt *mgmt;
 398         int left, chan = 0;
 399         u8 *pos;
 400         u8 *ssid = NULL, *wpa = NULL, *rsn = NULL;
 401         size_t ssid_len = 0, wpa_len = 0, rsn_len = 0;
 402         struct hostap_bss_info *bss;
 403
 404         if (skb->len < IEEE80211_MGMT_HDR_LEN + sizeof(mgmt->u.beacon))
 405                 return;
 406
 407         mgmt = (struct hostap_ieee80211_mgmt *) skb->data;
 408         pos = mgmt->u.beacon.variable;
 409         left = skb->len - (pos - skb->data);
 410
 411         while (left >= 2) {
 412                 if (2 + pos[1] > left)
 413                         return; /* parse failed */
 414                 switch (*pos) {
 415                 case WLAN_EID_SSID:
 416                         ssid = pos + 2;
 417                         ssid_len = pos[1];
 418                         break;
 419                 case WLAN_EID_GENERIC:
 420                         if (pos[1] >= 4 &&
 421                             pos[2] == 0x00 && pos[3] == 0x50 &&
 422                             pos[4] == 0xf2 && pos[5] == 1) {
 423                                 wpa = pos;
 424                                 wpa_len = pos[1] + 2;
 425                         }
 426                         break;
 427                 case WLAN_EID_RSN:
 428                         rsn = pos;
 429                         rsn_len = pos[1] + 2;
 430                         break;
 431                 case WLAN_EID_DS_PARAMS:
 432                         if (pos[1] >= 1)
 433                                 chan = pos[2];
 434                         break;
 435                 }
 436                 left -= 2 + pos[1];
 437                 pos += 2 + pos[1];
 438         }
 439
 440         if (wpa_len > MAX_WPA_IE_LEN)
 441                 wpa_len = MAX_WPA_IE_LEN;
 442         if (rsn_len > MAX_WPA_IE_LEN)
 443                 rsn_len = MAX_WPA_IE_LEN;
 444         if (ssid_len > sizeof(bss->ssid))
 445                 ssid_len = sizeof(bss->ssid);
 446
 447         spin_lock(&local->lock);
 448         bss = __hostap_get_bss(local, mgmt->bssid, ssid, ssid_len);
 449         if (bss == NULL)
 450                 bss = __hostap_add_bss(local, mgmt->bssid, ssid, ssid_len);
 451         if (bss) {
 452                 bss->last_update = jiffies;
 453                 bss->count++;
 454                 bss->capab_info = le16_to_cpu(mgmt->u.beacon.capab_info);
 455                 if (wpa) {
 456                         memcpy(bss->wpa_ie, wpa, wpa_len);
 457                         bss->wpa_ie_len = wpa_len;
 458                 } else
 459                         bss->wpa_ie_len = 0;
 460                 if (rsn) {
 461                         memcpy(bss->rsn_ie, rsn, rsn_len);
 462                         bss->rsn_ie_len = rsn_len;
 463                 } else
 464                         bss->rsn_ie_len = 0;
 465                 bss->chan = chan;
 466         }
 467         __hostap_expire_bss(local);
 468         spin_unlock(&local->lock);
 469 }
 470
 471
 472 static int
 473 hostap_rx_frame_mgmt(local_info_t *local, struct sk_buff *skb,
 474                      struct hostap_80211_rx_status *rx_stats, u16 type,
 475                      u16 stype)
 476 {
 477         if (local->iw_mode == IW_MODE_MASTER) {
 478                 hostap_update_sta_ps(local, (struct ieee80211_hdr_4addr *)
 479                                      skb->data);
 480         }
 481
 482         if (local->hostapd && type == IEEE80211_FTYPE_MGMT) {
 483                 if (stype == IEEE80211_STYPE_BEACON &&
 484                     local->iw_mode == IW_MODE_MASTER) {
 485                         struct sk_buff *skb2;
 486                         /* Process beacon frames also in kernel driver to
 487                          * update STA(AP) table statistics */
 488                         skb2 = skb_clone(skb, GFP_ATOMIC);
 489                         if (skb2)
 490                                 hostap_rx(skb2->dev, skb2, rx_stats);
 491                 }
 492
 493                 /* send management frames to the user space daemon for
 494                  * processing */
 495                 local->apdevstats.rx_packets++;
 496                 local->apdevstats.rx_bytes += skb->len;
 497                 if (local->apdev == NULL)
 498                         return -1;
 499                 prism2_rx_80211(local->apdev, skb, rx_stats, PRISM2_RX_MGMT);
 500                 return 0;
 501         }
 502
 503         if (local->iw_mode == IW_MODE_MASTER) {
 504                 if (type != IEEE80211_FTYPE_MGMT &&
 505                     type != IEEE80211_FTYPE_CTL) {
 506                         printk(KERN_DEBUG "%s: unknown management frame "
 507                                "(type=0x%02x, stype=0x%02x) dropped\n",
 508                                skb->dev->name, type >> 2, stype >> 4);
 509                         return -1;
 510                 }
 511
 512                 hostap_rx(skb->dev, skb, rx_stats);
 513                 return 0;
 514         } else if (type == IEEE80211_FTYPE_MGMT &&
 515                    (stype == IEEE80211_STYPE_BEACON ||
 516                     stype == IEEE80211_STYPE_PROBE_RESP)) {
 517                 hostap_rx_sta_beacon(local, skb, stype);
 518                 return -1;
 519         } else if (type == IEEE80211_FTYPE_MGMT &&
 520                    (stype == IEEE80211_STYPE_ASSOC_RESP ||
 521                     stype == IEEE80211_STYPE_REASSOC_RESP)) {
 522                 /* Ignore (Re)AssocResp silently since these are not currently
 523                  * needed but are still received when WPA/RSN mode is enabled.
 524                  */
 525                 return -1;
 526         } else {
 527                 printk(KERN_DEBUG "%s: hostap_rx_frame_mgmt: dropped unhandled"
 528                        " management frame in non-Host AP mode (type=%d:%d)\n",
 529                        skb->dev->name, type >> 2, stype >> 4);
 530                 return -1;
 531         }
 532 }
 533
 534
 535 /* Called only as a tasklet (software IRQ) */
 536 static struct net_device *prism2_rx_get_wds(local_info_t *local,
 537                                                    u8 *addr)
 538 {
 539         struct hostap_interface *iface = NULL;
 540         struct list_head *ptr;
 541
 542         read_lock_bh(&local->iface_lock);
 543         list_for_each(ptr, &local->hostap_interfaces) {
 544                 iface = list_entry(ptr, struct hostap_interface, list);
 545                 if (iface->type == HOSTAP_INTERFACE_WDS &&
 546                     memcmp(iface->u.wds.remote_addr, addr, ETH_ALEN) == 0)
 547                         break;
 548                 iface = NULL;
 549         }
 550         read_unlock_bh(&local->iface_lock);
 551
 552         return iface ? iface->dev : NULL;
 553 }
 554
 555
 556 static int
 557 hostap_rx_frame_wds(local_info_t *local, struct ieee80211_hdr_4addr *hdr,
 558                     u16 fc, struct net_device **wds)
 559 {
 560         DECLARE_MAC_BUF(mac);
 561         /* FIX: is this really supposed to accept WDS frames only in Master
 562          * mode? What about Repeater or Managed with WDS frames? */
 563         if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) !=
 564             (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS) &&
 565             (local->iw_mode != IW_MODE_MASTER || !(fc & IEEE80211_FCTL_TODS)))
 566                 return 0; /* not a WDS frame */
 567
 568         /* Possible WDS frame: either IEEE 802.11 compliant (if FromDS)
 569          * or own non-standard frame with 4th address after payload */
 570         if (memcmp(hdr->addr1, local->dev->dev_addr, ETH_ALEN) != 0 &&
 571             (hdr->addr1[0] != 0xff || hdr->addr1[1] != 0xff ||
 572              hdr->addr1[2] != 0xff || hdr->addr1[3] != 0xff ||
 573              hdr->addr1[4] != 0xff || hdr->addr1[5] != 0xff)) {
 574                 /* RA (or BSSID) is not ours - drop */
 575                 PDEBUG(DEBUG_EXTRA2, "%s: received WDS frame with "
 576                        "not own or broadcast %s=%s\n",
 577                        local->dev->name,
 578                        fc & IEEE80211_FCTL_FROMDS ? "RA" : "BSSID",
 579                        print_mac(mac, hdr->addr1));
 580                 return -1;
 581         }
 582
 583         /* check if the frame came from a registered WDS connection */
 584         *wds = prism2_rx_get_wds(local, hdr->addr2);
 585         if (*wds == NULL && fc & IEEE80211_FCTL_FROMDS &&
 586             (local->iw_mode != IW_MODE_INFRA ||
 587              !(local->wds_type & HOSTAP_WDS_AP_CLIENT) ||
 588              memcmp(hdr->addr2, local->bssid, ETH_ALEN) != 0)) {
 589                 /* require that WDS link has been registered with TA or the
 590                  * frame is from current AP when using 'AP client mode' */
 591                 PDEBUG(DEBUG_EXTRA, "%s: received WDS[4 addr] frame "
 592                        "from unknown TA=%s\n",
 593                        local->dev->name, print_mac(mac, hdr->addr2));
 594                 if (local->ap && local->ap->autom_ap_wds)
 595                         hostap_wds_link_oper(local, hdr->addr2, WDS_ADD);
 596                 return -1;
 597         }
 598
 599         if (*wds && !(fc & IEEE80211_FCTL_FROMDS) && local->ap &&
 600             hostap_is_sta_assoc(local->ap, hdr->addr2)) {
 601                 /* STA is actually associated with us even though it has a
 602                  * registered WDS link. Assume it is in 'AP client' mode.
 603                  * Since this is a 3-addr frame, assume it is not (bogus) WDS
 604                  * frame and process it like any normal ToDS frame from
 605                  * associated STA. */
 606                 *wds = NULL;
 607         }
 608
 609         return 0;
 610 }
 611
 612
 613 static int hostap_is_eapol_frame(local_info_t *local, struct sk_buff *skb)
 614 {
 615         struct net_device *dev = local->dev;
 616         u16 fc, ethertype;
 617         struct ieee80211_hdr_4addr *hdr;
 618         u8 *pos;
 619
 620         if (skb->len < 24)
 621                 return 0;
 622
 623         hdr = (struct ieee80211_hdr_4addr *) skb->data;
 624         fc = le16_to_cpu(hdr->frame_ctl);
 625
 626         /* check that the frame is unicast frame to us */
 627         if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
 628             IEEE80211_FCTL_TODS &&
 629             memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0 &&
 630             memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN) == 0) {
 631                 /* ToDS frame with own addr BSSID and DA */
 632         } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
 633                    IEEE80211_FCTL_FROMDS &&
 634                    memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0) {
 635                 /* FromDS frame with own addr as DA */
 636         } else
 637                 return 0;
 638
 639         if (skb->len < 24 + 8)
 640                 return 0;
 641
 642         /* check for port access entity Ethernet type */
 643         pos = skb->data + 24;
 644         ethertype = (pos[6] << 8) | pos[7];
 645         if (ethertype == ETH_P_PAE)
 646                 return 1;
 647
 648         return 0;
 649 }
 650
 651
 652 /* Called only as a tasklet (software IRQ) */
 653 static int
 654 hostap_rx_frame_decrypt(local_info_t *local, struct sk_buff *skb,
 655                         struct ieee80211_crypt_data *crypt)
 656 {
 657         struct ieee80211_hdr_4addr *hdr;
 658         int res, hdrlen;
 659
 660         if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)
 661                 return 0;
 662
 663         hdr = (struct ieee80211_hdr_4addr *) skb->data;
 664         hdrlen = hostap_80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
 665
 666         if (local->tkip_countermeasures &&
 667             strcmp(crypt->ops->name, "TKIP") == 0) {
 668                 if (net_ratelimit()) {
 669                         printk(KERN_DEBUG "%s: TKIP countermeasures: dropped "
 670                                "received packet from " MAC_FMT "\n",
 671                                local->dev->name,
 672                                hdr->addr2[0], hdr->addr2[1], hdr->addr2[2],
 673                                hdr->addr2[3], hdr->addr2[4], hdr->addr2[5]);
 674                 }
 675                 return -1;
 676         }
 677
 678         atomic_inc(&crypt->refcnt);
 679         res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
 680         atomic_dec(&crypt->refcnt);
 681         if (res < 0) {
 682                 printk(KERN_DEBUG "%s: decryption failed (SA=" MAC_FMT
 683                        ") res=%d\n",
 684                        local->dev->name,
 685                        hdr->addr2[0], hdr->addr2[1], hdr->addr2[2],
 686                        hdr->addr2[3], hdr->addr2[4], hdr->addr2[5],
 687                        res);
 688                 local->comm_tallies.rx_discards_wep_undecryptable++;
 689                 return -1;
 690         }
 691
 692         return res;
 693 }
 694
 695
 696 /* Called only as a tasklet (software IRQ) */
 697 static int
 698 hostap_rx_frame_decrypt_msdu(local_info_t *local, struct sk_buff *skb,
 699                              int keyidx, struct ieee80211_crypt_data *crypt)
 700 {
 701         struct ieee80211_hdr_4addr *hdr;
 702         int res, hdrlen;
 703         DECLARE_MAC_BUF(mac);
 704
 705         if (crypt == NULL || crypt->ops->decrypt_msdu == NULL)
 706                 return 0;
 707
 708         hdr = (struct ieee80211_hdr_4addr *) skb->data;
 709         hdrlen = hostap_80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
 710
 711         atomic_inc(&crypt->refcnt);
 712         res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);
 713         atomic_dec(&crypt->refcnt);
 714         if (res < 0) {
 715                 printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed"
 716                        " (SA=%s keyidx=%d)\n",
 717                        local->dev->name, print_mac(mac, hdr->addr2), keyidx);
 718                 return -1;
 719         }
 720
 721         return 0;
 722 }
 723
 724
 725 /* All received frames are sent to this function. @skb contains the frame in
 726  * IEEE 802.11 format, i.e., in the format it was sent over air.
 727  * This function is called only as a tasklet (software IRQ). */
 728 void hostap_80211_rx(struct net_device *dev, struct sk_buff *skb,
 729                      struct hostap_80211_rx_status *rx_stats)
 730 {
 731         struct hostap_interface *iface;
 732         local_info_t *local;
 733         struct ieee80211_hdr_4addr *hdr;
 734         size_t hdrlen;
 735         u16 fc, type, stype, sc;
 736         struct net_device *wds = NULL;
 737         struct net_device_stats *stats;
 738         unsigned int frag;
 739         u8 *payload;
 740         struct sk_buff *skb2 = NULL;
 741         u16 ethertype;
 742         int frame_authorized = 0;
 743         int from_assoc_ap = 0;
 744         u8 dst[ETH_ALEN];
 745         u8 src[ETH_ALEN];
 746         struct ieee80211_crypt_data *crypt = NULL;
 747         void *sta = NULL;
 748         int keyidx = 0;
 749
 750         iface = netdev_priv(dev);
 751         local = iface->local;
 752         iface->stats.rx_packets++;
 753         iface->stats.rx_bytes += skb->len;
 754
 755         /* dev is the master radio device; change this to be the default
 756          * virtual interface (this may be changed to WDS device below) */
 757         dev = local->ddev;
 758         iface = netdev_priv(dev);
 759
 760         hdr = (struct ieee80211_hdr_4addr *) skb->data;
 761         stats = hostap_get_stats(dev);
 762
 763         if (skb->len < 10)
 764                 goto rx_dropped;
 765
 766         fc = le16_to_cpu(hdr->frame_ctl);
 767         type = WLAN_FC_GET_TYPE(fc);
 768         stype = WLAN_FC_GET_STYPE(fc);
 769         sc = le16_to_cpu(hdr->seq_ctl);
 770         frag = WLAN_GET_SEQ_FRAG(sc);
 771         hdrlen = hostap_80211_get_hdrlen(fc);
 772
 773         /* Put this code here so that we avoid duplicating it in all
 774          * Rx paths. - Jean II */
 775 #ifdef IW_WIRELESS_SPY          /* defined in iw_handler.h */
 776         /* If spy monitoring on */
 777         if (iface->spy_data.spy_number > 0) {
 778                 struct iw_quality wstats;
 779                 wstats.level = rx_stats->signal;
 780                 wstats.noise = rx_stats->noise;
 781                 wstats.updated = IW_QUAL_LEVEL_UPDATED | IW_QUAL_NOISE_UPDATED
 782                         | IW_QUAL_QUAL_INVALID | IW_QUAL_DBM;
 783                 /* Update spy records */
 784                 wireless_spy_update(dev, hdr->addr2, &wstats);
 785         }
 786 #endif /* IW_WIRELESS_SPY */
 787         hostap_update_rx_stats(local->ap, hdr, rx_stats);
 788
 789         if (local->iw_mode == IW_MODE_MONITOR) {
 790                 monitor_rx(dev, skb, rx_stats);
 791                 return;
 792         }
 793
 794         if (local->host_decrypt) {
 795                 int idx = 0;
 796                 if (skb->len >= hdrlen + 3)
 797                         idx = skb->data[hdrlen + 3] >> 6;
 798                 crypt = local->crypt[idx];
 799                 sta = NULL;
 800
 801                 /* Use station specific key to override default keys if the
 802                  * receiver address is a unicast address ("individual RA"). If
 803                  * bcrx_sta_key parameter is set, station specific key is used
 804                  * even with broad/multicast targets (this is against IEEE
 805                  * 802.11, but makes it easier to use different keys with
 806                  * stations that do not support WEP key mapping). */
 807
 808                 if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key)
 809                         (void) hostap_handle_sta_crypto(local, hdr, &crypt,
 810                                                         &sta);
 811
 812                 /* allow NULL decrypt to indicate an station specific override
 813                  * for default encryption */
 814                 if (crypt && (crypt->ops == NULL ||
 815                               crypt->ops->decrypt_mpdu == NULL))
 816                         crypt = NULL;
 817
 818                 if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) {
 819 #if 0
 820                         /* This seems to be triggered by some (multicast?)
 821                          * frames from other than current BSS, so just drop the
 822                          * frames silently instead of filling system log with
 823                          * these reports. */
 824                         printk(KERN_DEBUG "%s: WEP decryption failed (not set)"
 825                                " (SA=" MAC_FMT ")\n",
 826                                local->dev->name,
 827                                hdr->addr2[0], hdr->addr2[1], hdr->addr2[2],
 828                                hdr->addr2[3], hdr->addr2[4], hdr->addr2[5]);
 829 #endif
 830                         local->comm_tallies.rx_discards_wep_undecryptable++;
 831                         goto rx_dropped;
 832                 }
 833         }
 834
 835         if (type != IEEE80211_FTYPE_DATA) {
 836                 if (type == IEEE80211_FTYPE_MGMT &&
 837                     stype == IEEE80211_STYPE_AUTH &&
 838                     fc & IEEE80211_FCTL_PROTECTED && local->host_decrypt &&
 839                     (keyidx = hostap_rx_frame_decrypt(local, skb, crypt)) < 0)
 840                 {
 841                         printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth "
 842                                "from " MAC_FMT "\n", dev->name,
 843                                hdr->addr2[0], hdr->addr2[1], hdr->addr2[2],
 844                                hdr->addr2[3], hdr->addr2[4], hdr->addr2[5]);
 845                         /* TODO: could inform hostapd about this so that it
 846                          * could send auth failure report */
 847                         goto rx_dropped;
 848                 }
 849
 850                 if (hostap_rx_frame_mgmt(local, skb, rx_stats, type, stype))
 851                         goto rx_dropped;
 852                 else
 853                         goto rx_exit;
 854         }
 855
 856         /* Data frame - extract src/dst addresses */
 857         if (skb->len < IEEE80211_DATA_HDR3_LEN)
 858                 goto rx_dropped;
 859
 860         switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
 861         case IEEE80211_FCTL_FROMDS:
 862                 memcpy(dst, hdr->addr1, ETH_ALEN);
 863                 memcpy(src, hdr->addr3, ETH_ALEN);
 864                 break;
 865         case IEEE80211_FCTL_TODS:
 866                 memcpy(dst, hdr->addr3, ETH_ALEN);
 867                 memcpy(src, hdr->addr2, ETH_ALEN);
 868                 break;
 869         case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
 870                 if (skb->len < IEEE80211_DATA_HDR4_LEN)
 871                         goto rx_dropped;
 872                 memcpy(dst, hdr->addr3, ETH_ALEN);
 873                 memcpy(src, hdr->addr4, ETH_ALEN);
 874                 break;
 875         case 0:
 876                 memcpy(dst, hdr->addr1, ETH_ALEN);
 877                 memcpy(src, hdr->addr2, ETH_ALEN);
 878                 break;
 879         }
 880
 881         if (hostap_rx_frame_wds(local, hdr, fc, &wds))
 882                 goto rx_dropped;
 883         if (wds) {
 884                 skb->dev = dev = wds;
 885                 stats = hostap_get_stats(dev);
 886         }
 887
 888         if (local->iw_mode == IW_MODE_MASTER && !wds &&
 889             (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
 890             IEEE80211_FCTL_FROMDS &&
 891             local->stadev &&
 892             memcmp(hdr->addr2, local->assoc_ap_addr, ETH_ALEN) == 0) {
 893                 /* Frame from BSSID of the AP for which we are a client */
 894                 skb->dev = dev = local->stadev;
 895                 stats = hostap_get_stats(dev);
 896                 from_assoc_ap = 1;
 897         }
 898
 899         dev->last_rx = jiffies;
 900
 901         if ((local->iw_mode == IW_MODE_MASTER ||
 902              local->iw_mode == IW_MODE_REPEAT) &&
 903             !from_assoc_ap) {
 904                 switch (hostap_handle_sta_rx(local, dev, skb, rx_stats,
 905                                              wds != NULL)) {
 906                 case AP_RX_CONTINUE_NOT_AUTHORIZED:
 907                         frame_authorized = 0;
 908                         break;
 909                 case AP_RX_CONTINUE:
 910                         frame_authorized = 1;
 911                         break;
 912                 case AP_RX_DROP:
 913                         goto rx_dropped;
 914                 case AP_RX_EXIT:
 915                         goto rx_exit;
 916                 }
 917         }
 918
 919         /* Nullfunc frames may have PS-bit set, so they must be passed to
 920          * hostap_handle_sta_rx() before being dropped here. */
 921         if (stype != IEEE80211_STYPE_DATA &&
 922             stype != IEEE80211_STYPE_DATA_CFACK &&
 923             stype != IEEE80211_STYPE_DATA_CFPOLL &&
 924             stype != IEEE80211_STYPE_DATA_CFACKPOLL) {
 925                 if (stype != IEEE80211_STYPE_NULLFUNC)
 926                         printk(KERN_DEBUG "%s: RX: dropped data frame "
 927                                "with no data (type=0x%02x, subtype=0x%02x)\n",
 928                                dev->name, type >> 2, stype >> 4);
 929                 goto rx_dropped;
 930         }
 931
 932         /* skb: hdr + (possibly fragmented, possibly encrypted) payload */
 933
 934         if (local->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
 935             (keyidx = hostap_rx_frame_decrypt(local, skb, crypt)) < 0)
 936                 goto rx_dropped;
 937         hdr = (struct ieee80211_hdr_4addr *) skb->data;
 938
 939         /* skb: hdr + (possibly fragmented) plaintext payload */
 940
 941         if (local->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
 942             (frag != 0 || (fc & IEEE80211_FCTL_MOREFRAGS))) {
 943                 int flen;
 944                 struct sk_buff *frag_skb =
 945                         prism2_frag_cache_get(local, hdr);
 946                 if (!frag_skb) {
 947                         printk(KERN_DEBUG "%s: Rx cannot get skb from "
 948                                "fragment cache (morefrag=%d seq=%u frag=%u)\n",
 949                                dev->name, (fc & IEEE80211_FCTL_MOREFRAGS) != 0,
 950                                WLAN_GET_SEQ_SEQ(sc) >> 4, frag);
 951                         goto rx_dropped;
 952                 }
 953
 954                 flen = skb->len;
 955                 if (frag != 0)
 956                         flen -= hdrlen;
 957
 958                 if (frag_skb->tail + flen > frag_skb->end) {
 959                         printk(KERN_WARNING "%s: host decrypted and "
 960                                "reassembled frame did not fit skb\n",
 961                                dev->name);
 962                         prism2_frag_cache_invalidate(local, hdr);
 963                         goto rx_dropped;
 964                 }
 965
 966                 if (frag == 0) {
 967                         /* copy first fragment (including full headers) into
 968                          * beginning of the fragment cache skb */
 969                         skb_copy_from_linear_data(skb, skb_put(frag_skb, flen),
 970                                                   flen);
 971                 } else {
 972                         /* append frame payload to the end of the fragment
 973                          * cache skb */
 974                         skb_copy_from_linear_data_offset(skb, hdrlen,
 975                                                          skb_put(frag_skb,
 976                                                                  flen), flen);
 977                 }
 978                 dev_kfree_skb(skb);
 979                 skb = NULL;
 980
 981                 if (fc & IEEE80211_FCTL_MOREFRAGS) {
 982                         /* more fragments expected - leave the skb in fragment
 983                          * cache for now; it will be delivered to upper layers
 984                          * after all fragments have been received */
 985                         goto rx_exit;
 986                 }
 987
 988                 /* this was the last fragment and the frame will be
 989                  * delivered, so remove skb from fragment cache */
 990                 skb = frag_skb;
 991                 hdr = (struct ieee80211_hdr_4addr *) skb->data;
 992                 prism2_frag_cache_invalidate(local, hdr);
 993         }
 994
 995         /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
 996          * encrypted/authenticated */
 997
 998         if (local->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
 999             hostap_rx_frame_decrypt_msdu(local, skb, keyidx, crypt))
1000                 goto rx_dropped;
1001
1002         hdr = (struct ieee80211_hdr_4addr *) skb->data;
1003         if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !local->open_wep) {
1004                 if (local->ieee_802_1x &&
1005                     hostap_is_eapol_frame(local, skb)) {
1006                         /* pass unencrypted EAPOL frames even if encryption is
1007                          * configured */
1008                         PDEBUG(DEBUG_EXTRA2, "%s: RX: IEEE 802.1X - passing "
1009                                "unencrypted EAPOL frame\n", local->dev->name);
1010                 } else {
1011                         printk(KERN_DEBUG "%s: encryption configured, but RX "
1012                                "frame not encrypted (SA=" MAC_FMT ")\n",
1013                                local->dev->name,
1014                                hdr->addr2[0], hdr->addr2[1], hdr->addr2[2],
1015                                hdr->addr2[3], hdr->addr2[4], hdr->addr2[5]);
1016                         goto rx_dropped;
1017                 }
1018         }
1019
1020         if (local->drop_unencrypted && !(fc & IEEE80211_FCTL_PROTECTED) &&
1021             !hostap_is_eapol_frame(local, skb)) {
1022                 if (net_ratelimit()) {
1023                         printk(KERN_DEBUG "%s: dropped unencrypted RX data "
1024                                "frame from " MAC_FMT " (drop_unencrypted=1)\n",
1025                                dev->name,
1026                                hdr->addr2[0], hdr->addr2[1], hdr->addr2[2],
1027                                hdr->addr2[3], hdr->addr2[4], hdr->addr2[5]);
1028                 }
1029                 goto rx_dropped;
1030         }
1031
1032         /* skb: hdr + (possible reassembled) full plaintext payload */
1033
1034         payload = skb->data + hdrlen;
1035         ethertype = (payload[6] << 8) | payload[7];
1036
1037         /* If IEEE 802.1X is used, check whether the port is authorized to send
1038          * the received frame. */
1039         if (local->ieee_802_1x && local->iw_mode == IW_MODE_MASTER) {
1040                 if (ethertype == ETH_P_PAE) {
1041                         PDEBUG(DEBUG_EXTRA2, "%s: RX: IEEE 802.1X frame\n",
1042                                dev->name);
1043                         if (local->hostapd && local->apdev) {
1044                                 /* Send IEEE 802.1X frames to the user
1045                                  * space daemon for processing */
1046                                 prism2_rx_80211(local->apdev, skb, rx_stats,
1047                                                 PRISM2_RX_MGMT);
1048                                 local->apdevstats.rx_packets++;
1049                                 local->apdevstats.rx_bytes += skb->len;
1050                                 goto rx_exit;
1051                         }
1052                 } else if (!frame_authorized) {
1053                         printk(KERN_DEBUG "%s: dropped frame from "
1054                                "unauthorized port (IEEE 802.1X): "
1055                                "ethertype=0x%04x\n",
1056                                dev->name, ethertype);
1057                         goto rx_dropped;
1058                 }
1059         }
1060
1061         /* convert hdr + possible LLC headers into Ethernet header */
1062         if (skb->len - hdrlen >= 8 &&
1063             ((memcmp(payload, rfc1042_header, 6) == 0 &&
1064               ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1065              memcmp(payload, bridge_tunnel_header, 6) == 0)) {
1066                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1067                  * replace EtherType */
1068                 skb_pull(skb, hdrlen + 6);
1069                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1070                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1071         } else {
1072                 __be16 len;
1073                 /* Leave Ethernet header part of hdr and full payload */
1074                 skb_pull(skb, hdrlen);
1075                 len = htons(skb->len);
1076                 memcpy(skb_push(skb, 2), &len, 2);
1077                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1078                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1079         }
1080
1081         if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
1082                     IEEE80211_FCTL_TODS) &&
1083             skb->len >= ETH_HLEN + ETH_ALEN) {
1084                 /* Non-standard frame: get addr4 from its bogus location after
1085                  * the payload */
1086                 skb_copy_from_linear_data_offset(skb, skb->len - ETH_ALEN,
1087                                                  skb->data + ETH_ALEN,
1088                                                  ETH_ALEN);
1089                 skb_trim(skb, skb->len - ETH_ALEN);
1090         }
1091
1092         stats->rx_packets++;
1093         stats->rx_bytes += skb->len;
1094
1095         if (local->iw_mode == IW_MODE_MASTER && !wds &&
1096             local->ap->bridge_packets) {
1097                 if (dst[0] & 0x01) {
1098                         /* copy multicast frame both to the higher layers and
1099                          * to the wireless media */
1100                         local->ap->bridged_multicast++;
1101                         skb2 = skb_clone(skb, GFP_ATOMIC);
1102                         if (skb2 == NULL)
1103                                 printk(KERN_DEBUG "%s: skb_clone failed for "
1104                                        "multicast frame\n", dev->name);
1105                 } else if (hostap_is_sta_authorized(local->ap, dst)) {
1106                         /* send frame directly to the associated STA using
1107                          * wireless media and not passing to higher layers */
1108                         local->ap->bridged_unicast++;
1109                         skb2 = skb;
1110                         skb = NULL;
1111                 }
1112         }
1113
1114         if (skb2 != NULL) {
1115                 /* send to wireless media */
1116                 skb2->dev = dev;
1117                 skb2->protocol = __constant_htons(ETH_P_802_3);
1118                 skb_reset_mac_header(skb2);
1119                 skb_reset_network_header(skb2);
1120                 /* skb2->network_header += ETH_HLEN; */
1121                 dev_queue_xmit(skb2);
1122         }
1123
1124         if (skb) {
1125                 skb->protocol = eth_type_trans(skb, dev);
1126                 memset(skb->cb, 0, sizeof(skb->cb));
1127                 netif_rx(skb);
1128         }
1129
1130  rx_exit:
1131         if (sta)
1132                 hostap_handle_sta_release(sta);
1133         return;
1134
1135  rx_dropped:
1136         dev_kfree_skb(skb);
1137
1138         stats->rx_dropped++;
1139         goto rx_exit;
1140 }
1141
1142
1143 EXPORT_SYMBOL(hostap_80211_rx);