drivers/net/wireless/intersil/hostap/hostap_80211

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
hostap_dump_rx_80211
prism2_rx_80211
monitor_rx
prism2_frag_cache_find
prism2_frag_cache_get
prism2_frag_cache_invalidate
__hostap_get_bss
__hostap_add_bss
__hostap_expire_bss
hostap_rx_sta_beacon
hostap_rx_frame_mgmt
prism2_rx_get_wds
hostap_rx_frame_wds
hostap_is_eapol_frame
hostap_rx_frame_decrypt
hostap_rx_frame_decrypt_msdu
hostap_80211_rx
   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/etherdevice.h>
   3 #include <linux/slab.h>
   4 #include <linux/export.h>
   5 #include <net/lib80211.h>
   6 #include <linux/if_arp.h>
   7 
   8 #include "hostap_80211.h"
   9 #include "hostap.h"
  10 #include "hostap_ap.h"
  11 
  12 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
  13 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
  14 static unsigned char rfc1042_header[] =
  15 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
  16 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
  17 static unsigned char bridge_tunnel_header[] =
  18 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
  19 /* No encapsulation header if EtherType < 0x600 (=length) */
  20 
  21 void hostap_dump_rx_80211(const char *name, struct sk_buff *skb,
  22                           struct hostap_80211_rx_status *rx_stats)
  23 {
  24         struct ieee80211_hdr *hdr;
  25         u16 fc;
  26 
  27         hdr = (struct ieee80211_hdr *) skb->data;
  28 
  29         printk(KERN_DEBUG "%s: RX signal=%d noise=%d rate=%d len=%d "
  30                "jiffies=%ld\n",
  31                name, rx_stats->signal, rx_stats->noise, rx_stats->rate,
  32                skb->len, jiffies);
  33 
  34         if (skb->len < 2)
  35                 return;
  36 
  37         fc = le16_to_cpu(hdr->frame_control);
  38         printk(KERN_DEBUG "   FC=0x%04x (type=%d:%d)%s%s",
  39                fc, (fc & IEEE80211_FCTL_FTYPE) >> 2,
  40                (fc & IEEE80211_FCTL_STYPE) >> 4,
  41                fc & IEEE80211_FCTL_TODS ? " [ToDS]" : "",
  42                fc & IEEE80211_FCTL_FROMDS ? " [FromDS]" : "");
  43 
  44         if (skb->len < IEEE80211_DATA_HDR3_LEN) {
  45                 printk("\n");
  46                 return;
  47         }
  48 
  49         printk(" dur=0x%04x seq=0x%04x\n", le16_to_cpu(hdr->duration_id),
  50                le16_to_cpu(hdr->seq_ctrl));
  51 
  52         printk(KERN_DEBUG "   A1=%pM", hdr->addr1);
  53         printk(" A2=%pM", hdr->addr2);
  54         printk(" A3=%pM", hdr->addr3);
  55         if (skb->len >= 30)
  56                 printk(" A4=%pM", hdr->addr4);
  57         printk("\n");
  58 }
  59 
  60 
  61 /* Send RX frame to netif with 802.11 (and possible prism) header.
  62  * Called from hardware or software IRQ context. */
  63 int prism2_rx_80211(struct net_device *dev, struct sk_buff *skb,
  64                     struct hostap_80211_rx_status *rx_stats, int type)
  65 {
  66         struct hostap_interface *iface;
  67         local_info_t *local;
  68         int hdrlen, phdrlen, head_need, tail_need;
  69         u16 fc;
  70         int prism_header, ret;
  71         struct ieee80211_hdr *fhdr;
  72 
  73         iface = netdev_priv(dev);
  74         local = iface->local;
  75 
  76         if (dev->type == ARPHRD_IEEE80211_PRISM) {
  77                 if (local->monitor_type == PRISM2_MONITOR_PRISM) {
  78                         prism_header = 1;
  79                         phdrlen = sizeof(struct linux_wlan_ng_prism_hdr);
  80                 } else { /* local->monitor_type == PRISM2_MONITOR_CAPHDR */
  81                         prism_header = 2;
  82                         phdrlen = sizeof(struct linux_wlan_ng_cap_hdr);
  83                 }
  84         } else if (dev->type == ARPHRD_IEEE80211_RADIOTAP) {
  85                 prism_header = 3;
  86                 phdrlen = sizeof(struct hostap_radiotap_rx);
  87         } else {
  88                 prism_header = 0;
  89                 phdrlen = 0;
  90         }
  91 
  92         fhdr = (struct ieee80211_hdr *) skb->data;
  93         fc = le16_to_cpu(fhdr->frame_control);
  94 
  95         if (type == PRISM2_RX_MGMT && (fc & IEEE80211_FCTL_VERS)) {
  96                 printk(KERN_DEBUG "%s: dropped management frame with header "
  97                        "version %d\n", dev->name, fc & IEEE80211_FCTL_VERS);
  98                 dev_kfree_skb_any(skb);
  99                 return 0;
 100         }
 101 
 102         hdrlen = hostap_80211_get_hdrlen(fhdr->frame_control);
 103 
 104         /* check if there is enough room for extra data; if not, expand skb
 105          * buffer to be large enough for the changes */
 106         head_need = phdrlen;
 107         tail_need = 0;
 108 #ifdef PRISM2_ADD_BOGUS_CRC
 109         tail_need += 4;
 110 #endif /* PRISM2_ADD_BOGUS_CRC */
 111 
 112         head_need -= skb_headroom(skb);
 113         tail_need -= skb_tailroom(skb);
 114 
 115         if (head_need > 0 || tail_need > 0) {
 116                 if (pskb_expand_head(skb, head_need > 0 ? head_need : 0,
 117                                      tail_need > 0 ? tail_need : 0,
 118                                      GFP_ATOMIC)) {
 119                         printk(KERN_DEBUG "%s: prism2_rx_80211 failed to "
 120                                "reallocate skb buffer\n", dev->name);
 121                         dev_kfree_skb_any(skb);
 122                         return 0;
 123                 }
 124         }
 125 
 126         /* We now have an skb with enough head and tail room, so just insert
 127          * the extra data */
 128 
 129 #ifdef PRISM2_ADD_BOGUS_CRC
 130         memset(skb_put(skb, 4), 0xff, 4); /* Prism2 strips CRC */
 131 #endif /* PRISM2_ADD_BOGUS_CRC */
 132 
 133         if (prism_header == 1) {
 134                 struct linux_wlan_ng_prism_hdr *hdr;
 135                 hdr = skb_push(skb, phdrlen);
 136                 memset(hdr, 0, phdrlen);
 137                 hdr->msgcode = LWNG_CAP_DID_BASE;
 138                 hdr->msglen = sizeof(*hdr);
 139                 memcpy(hdr->devname, dev->name, sizeof(hdr->devname));
 140 #define LWNG_SETVAL(f,i,s,l,d) \
 141 hdr->f.did = LWNG_CAP_DID_BASE | (i << 12); \
 142 hdr->f.status = s; hdr->f.len = l; hdr->f.data = d
 143                 LWNG_SETVAL(hosttime, 1, 0, 4, jiffies);
 144                 LWNG_SETVAL(mactime, 2, 0, 4, rx_stats->mac_time);
 145                 LWNG_SETVAL(channel, 3, 1 /* no value */, 4, 0);
 146                 LWNG_SETVAL(rssi, 4, 1 /* no value */, 4, 0);
 147                 LWNG_SETVAL(sq, 5, 1 /* no value */, 4, 0);
 148                 LWNG_SETVAL(signal, 6, 0, 4, rx_stats->signal);
 149                 LWNG_SETVAL(noise, 7, 0, 4, rx_stats->noise);
 150                 LWNG_SETVAL(rate, 8, 0, 4, rx_stats->rate / 5);
 151                 LWNG_SETVAL(istx, 9, 0, 4, 0);
 152                 LWNG_SETVAL(frmlen, 10, 0, 4, skb->len - phdrlen);
 153 #undef LWNG_SETVAL
 154         } else if (prism_header == 2) {
 155                 struct linux_wlan_ng_cap_hdr *hdr;
 156                 hdr = 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 = 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) */
 208 static 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) */
 220 static struct prism2_frag_entry *
 221 prism2_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) */
 250 static struct sk_buff *
 251 prism2_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) */
 302 static 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 
 326 static 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 
 347 static 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 
 373 static 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. */
 392 static 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_VENDOR_SPECIFIC:
 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 
 470 static int
 471 hostap_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) */
 532 static 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 
 552 static int
 553 hostap_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 (!ether_addr_equal(hdr->addr1, local->dev->dev_addr) &&
 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 
 608 static 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             ether_addr_equal(hdr->addr1, dev->dev_addr) &&
 625             ether_addr_equal(hdr->addr3, dev->dev_addr)) {
 626                 /* ToDS frame with own addr BSSID and DA */
 627         } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
 628                    IEEE80211_FCTL_FROMDS &&
 629                    ether_addr_equal(hdr->addr1, dev->dev_addr)) {
 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) */
 648 static int
 649 hostap_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) */
 686 static int
 687 hostap_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). */
 716 void 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         default:
 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 
1116 EXPORT_SYMBOL(hostap_80211_rx);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/net/wireless/intersil/hostap/hostap_80211_rx.c

DEFINITIONS
