drivers/net/wireless/hostap/hostap_80211_tx.c

   1 #include "hostap_80211.h"
   2 #include "hostap_common.h"
   3 #include "hostap_wlan.h"
   4 #include "hostap.h"
   5 #include "hostap_ap.h"
   6
   7 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
   8 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
   9 static unsigned char rfc1042_header[] =
  10 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
  11 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
  12 static unsigned char bridge_tunnel_header[] =
  13 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
  14 /* No encapsulation header if EtherType < 0x600 (=length) */
  15
  16 void hostap_dump_tx_80211(const char *name, struct sk_buff *skb)
  17 {
  18         struct ieee80211_hdr *hdr;
  19         u16 fc;
  20
  21         hdr = (struct ieee80211_hdr *) skb->data;
  22
  23         printk(KERN_DEBUG "%s: TX len=%d jiffies=%ld\n",
  24                name, skb->len, jiffies);
  25
  26         if (skb->len < 2)
  27                 return;
  28
  29         fc = le16_to_cpu(hdr->frame_control);
  30         printk(KERN_DEBUG "   FC=0x%04x (type=%d:%d)%s%s",
  31                fc, (fc & IEEE80211_FCTL_FTYPE) >> 2,
  32                (fc & IEEE80211_FCTL_STYPE) >> 4,
  33                fc & IEEE80211_FCTL_TODS ? " [ToDS]" : "",
  34                fc & IEEE80211_FCTL_FROMDS ? " [FromDS]" : "");
  35
  36         if (skb->len < IEEE80211_DATA_HDR3_LEN) {
  37                 printk("\n");
  38                 return;
  39         }
  40
  41         printk(" dur=0x%04x seq=0x%04x\n", le16_to_cpu(hdr->duration_id),
  42                le16_to_cpu(hdr->seq_ctrl));
  43
  44         printk(KERN_DEBUG "   A1=%pM", hdr->addr1);
  45         printk(" A2=%pM", hdr->addr2);
  46         printk(" A3=%pM", hdr->addr3);
  47         if (skb->len >= 30)
  48                 printk(" A4=%pM", hdr->addr4);
  49         printk("\n");
  50 }
  51
  52
  53 /* hard_start_xmit function for data interfaces (wlan#, wlan#wds#, wlan#sta)
  54  * Convert Ethernet header into a suitable IEEE 802.11 header depending on
  55  * device configuration. */
  56 netdev_tx_t hostap_data_start_xmit(struct sk_buff *skb,
  57                                    struct net_device *dev)
  58 {
  59         struct hostap_interface *iface;
  60         local_info_t *local;
  61         int need_headroom, need_tailroom = 0;
  62         struct ieee80211_hdr hdr;
  63         u16 fc, ethertype = 0;
  64         enum {
  65                 WDS_NO = 0, WDS_OWN_FRAME, WDS_COMPLIANT_FRAME
  66         } use_wds = WDS_NO;
  67         u8 *encaps_data;
  68         int hdr_len, encaps_len, skip_header_bytes;
  69         int to_assoc_ap = 0;
  70         struct hostap_skb_tx_data *meta;
  71
  72         iface = netdev_priv(dev);
  73         local = iface->local;
  74
  75         if (skb->len < ETH_HLEN) {
  76                 printk(KERN_DEBUG "%s: hostap_data_start_xmit: short skb "
  77                        "(len=%d)\n", dev->name, skb->len);
  78                 kfree_skb(skb);
  79                 return NETDEV_TX_OK;
  80         }
  81
  82         if (local->ddev != dev) {
  83                 use_wds = (local->iw_mode == IW_MODE_MASTER &&
  84                            !(local->wds_type & HOSTAP_WDS_STANDARD_FRAME)) ?
  85                         WDS_OWN_FRAME : WDS_COMPLIANT_FRAME;
  86                 if (dev == local->stadev) {
  87                         to_assoc_ap = 1;
  88                         use_wds = WDS_NO;
  89                 } else if (dev == local->apdev) {
  90                         printk(KERN_DEBUG "%s: prism2_tx: trying to use "
  91                                "AP device with Ethernet net dev\n", dev->name);
  92                         kfree_skb(skb);
  93                         return NETDEV_TX_OK;
  94                 }
  95         } else {
  96                 if (local->iw_mode == IW_MODE_REPEAT) {
  97                         printk(KERN_DEBUG "%s: prism2_tx: trying to use "
  98                                "non-WDS link in Repeater mode\n", dev->name);
  99                         kfree_skb(skb);
 100                         return NETDEV_TX_OK;
 101                 } else if (local->iw_mode == IW_MODE_INFRA &&
 102                            (local->wds_type & HOSTAP_WDS_AP_CLIENT) &&
 103                            memcmp(skb->data + ETH_ALEN, dev->dev_addr,
 104                                   ETH_ALEN) != 0) {
 105                         /* AP client mode: send frames with foreign src addr
 106                          * using 4-addr WDS frames */
 107                         use_wds = WDS_COMPLIANT_FRAME;
 108                 }
 109         }
 110
 111         /* Incoming skb->data: dst_addr[6], src_addr[6], proto[2], payload
 112          * ==>
 113          * Prism2 TX frame with 802.11 header:
 114          * txdesc (address order depending on used mode; includes dst_addr and
 115          * src_addr), possible encapsulation (RFC1042/Bridge-Tunnel;
 116          * proto[2], payload {, possible addr4[6]} */
 117
 118         ethertype = (skb->data[12] << 8) | skb->data[13];
 119
 120         memset(&hdr, 0, sizeof(hdr));
 121
 122         /* Length of data after IEEE 802.11 header */
 123         encaps_data = NULL;
 124         encaps_len = 0;
 125         skip_header_bytes = ETH_HLEN;
 126         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
 127                 encaps_data = bridge_tunnel_header;
 128                 encaps_len = sizeof(bridge_tunnel_header);
 129                 skip_header_bytes -= 2;
 130         } else if (ethertype >= 0x600) {
 131                 encaps_data = rfc1042_header;
 132                 encaps_len = sizeof(rfc1042_header);
 133                 skip_header_bytes -= 2;
 134         }
 135
 136         fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
 137         hdr_len = IEEE80211_DATA_HDR3_LEN;
 138
 139         if (use_wds != WDS_NO) {
 140                 /* Note! Prism2 station firmware has problems with sending real
 141                  * 802.11 frames with four addresses; until these problems can
 142                  * be fixed or worked around, 4-addr frames needed for WDS are
 143                  * using incompatible format: FromDS flag is not set and the
 144                  * fourth address is added after the frame payload; it is
 145                  * assumed, that the receiving station knows how to handle this
 146                  * frame format */
 147
 148                 if (use_wds == WDS_COMPLIANT_FRAME) {
 149                         fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
 150                         /* From&To DS: Addr1 = RA, Addr2 = TA, Addr3 = DA,
 151                          * Addr4 = SA */
 152                         skb_copy_from_linear_data_offset(skb, ETH_ALEN,
 153                                                          &hdr.addr4, ETH_ALEN);
 154                         hdr_len += ETH_ALEN;
 155                 } else {
 156                         /* bogus 4-addr format to workaround Prism2 station
 157                          * f/w bug */
 158                         fc |= IEEE80211_FCTL_TODS;
 159                         /* From DS: Addr1 = DA (used as RA),
 160                          * Addr2 = BSSID (used as TA), Addr3 = SA (used as DA),
 161                          */
 162
 163                         /* SA from skb->data + ETH_ALEN will be added after
 164                          * frame payload; use hdr.addr4 as a temporary buffer
 165                          */
 166                         skb_copy_from_linear_data_offset(skb, ETH_ALEN,
 167                                                          &hdr.addr4, ETH_ALEN);
 168                         need_tailroom += ETH_ALEN;
 169                 }
 170
 171                 /* send broadcast and multicast frames to broadcast RA, if
 172                  * configured; otherwise, use unicast RA of the WDS link */
 173                 if ((local->wds_type & HOSTAP_WDS_BROADCAST_RA) &&
 174                     skb->data[0] & 0x01)
 175                         memset(&hdr.addr1, 0xff, ETH_ALEN);
 176                 else if (iface->type == HOSTAP_INTERFACE_WDS)
 177                         memcpy(&hdr.addr1, iface->u.wds.remote_addr,
 178                                ETH_ALEN);
 179                 else
 180                         memcpy(&hdr.addr1, local->bssid, ETH_ALEN);
 181                 memcpy(&hdr.addr2, dev->dev_addr, ETH_ALEN);
 182                 skb_copy_from_linear_data(skb, &hdr.addr3, ETH_ALEN);
 183         } else if (local->iw_mode == IW_MODE_MASTER && !to_assoc_ap) {
 184                 fc |= IEEE80211_FCTL_FROMDS;
 185                 /* From DS: Addr1 = DA, Addr2 = BSSID, Addr3 = SA */
 186                 skb_copy_from_linear_data(skb, &hdr.addr1, ETH_ALEN);
 187                 memcpy(&hdr.addr2, dev->dev_addr, ETH_ALEN);
 188                 skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr3,
 189                                                  ETH_ALEN);
 190         } else if (local->iw_mode == IW_MODE_INFRA || to_assoc_ap) {
 191                 fc |= IEEE80211_FCTL_TODS;
 192                 /* To DS: Addr1 = BSSID, Addr2 = SA, Addr3 = DA */
 193                 memcpy(&hdr.addr1, to_assoc_ap ?
 194                        local->assoc_ap_addr : local->bssid, ETH_ALEN);
 195                 skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr2,
 196                                                  ETH_ALEN);
 197                 skb_copy_from_linear_data(skb, &hdr.addr3, ETH_ALEN);
 198         } else if (local->iw_mode == IW_MODE_ADHOC) {
 199                 /* not From/To DS: Addr1 = DA, Addr2 = SA, Addr3 = BSSID */
 200                 skb_copy_from_linear_data(skb, &hdr.addr1, ETH_ALEN);
 201                 skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr2,
 202                                                  ETH_ALEN);
 203                 memcpy(&hdr.addr3, local->bssid, ETH_ALEN);
 204         }
 205
 206         hdr.frame_control = cpu_to_le16(fc);
 207
 208         skb_pull(skb, skip_header_bytes);
 209         need_headroom = local->func->need_tx_headroom + hdr_len + encaps_len;
 210         if (skb_tailroom(skb) < need_tailroom) {
 211                 skb = skb_unshare(skb, GFP_ATOMIC);
 212                 if (skb == NULL) {
 213                         iface->stats.tx_dropped++;
 214                         return NETDEV_TX_OK;
 215                 }
 216                 if (pskb_expand_head(skb, need_headroom, need_tailroom,
 217                                      GFP_ATOMIC)) {
 218                         kfree_skb(skb);
 219                         iface->stats.tx_dropped++;
 220                         return NETDEV_TX_OK;
 221                 }
 222         } else if (skb_headroom(skb) < need_headroom) {
 223                 struct sk_buff *tmp = skb;
 224                 skb = skb_realloc_headroom(skb, need_headroom);
 225                 kfree_skb(tmp);
 226                 if (skb == NULL) {
 227                         iface->stats.tx_dropped++;
 228                         return NETDEV_TX_OK;
 229                 }
 230         } else {
 231                 skb = skb_unshare(skb, GFP_ATOMIC);
 232                 if (skb == NULL) {
 233                         iface->stats.tx_dropped++;
 234                         return NETDEV_TX_OK;
 235                 }
 236         }
 237
 238         if (encaps_data)
 239                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
 240         memcpy(skb_push(skb, hdr_len), &hdr, hdr_len);
 241         if (use_wds == WDS_OWN_FRAME) {
 242                 memcpy(skb_put(skb, ETH_ALEN), &hdr.addr4, ETH_ALEN);
 243         }
 244
 245         iface->stats.tx_packets++;
 246         iface->stats.tx_bytes += skb->len;
 247
 248         skb_reset_mac_header(skb);
 249         meta = (struct hostap_skb_tx_data *) skb->cb;
 250         memset(meta, 0, sizeof(*meta));
 251         meta->magic = HOSTAP_SKB_TX_DATA_MAGIC;
 252         if (use_wds)
 253                 meta->flags |= HOSTAP_TX_FLAGS_WDS;
 254         meta->ethertype = ethertype;
 255         meta->iface = iface;
 256
 257         /* Send IEEE 802.11 encapsulated frame using the master radio device */
 258         skb->dev = local->dev;
 259         dev_queue_xmit(skb);
 260         return NETDEV_TX_OK;
 261 }
 262
 263
 264 /* hard_start_xmit function for hostapd wlan#ap interfaces */
 265 netdev_tx_t hostap_mgmt_start_xmit(struct sk_buff *skb,
 266                                    struct net_device *dev)
 267 {
 268         struct hostap_interface *iface;
 269         local_info_t *local;
 270         struct hostap_skb_tx_data *meta;
 271         struct ieee80211_hdr *hdr;
 272         u16 fc;
 273
 274         iface = netdev_priv(dev);
 275         local = iface->local;
 276
 277         if (skb->len < 10) {
 278                 printk(KERN_DEBUG "%s: hostap_mgmt_start_xmit: short skb "
 279                        "(len=%d)\n", dev->name, skb->len);
 280                 kfree_skb(skb);
 281                 return NETDEV_TX_OK;
 282         }
 283
 284         iface->stats.tx_packets++;
 285         iface->stats.tx_bytes += skb->len;
 286
 287         meta = (struct hostap_skb_tx_data *) skb->cb;
 288         memset(meta, 0, sizeof(*meta));
 289         meta->magic = HOSTAP_SKB_TX_DATA_MAGIC;
 290         meta->iface = iface;
 291
 292         if (skb->len >= IEEE80211_DATA_HDR3_LEN + sizeof(rfc1042_header) + 2) {
 293                 hdr = (struct ieee80211_hdr *) skb->data;
 294                 fc = le16_to_cpu(hdr->frame_control);
 295                 if (ieee80211_is_data(hdr->frame_control) &&
 296                     (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DATA) {
 297                         u8 *pos = &skb->data[IEEE80211_DATA_HDR3_LEN +
 298                                              sizeof(rfc1042_header)];
 299                         meta->ethertype = (pos[0] << 8) | pos[1];
 300                 }
 301         }
 302
 303         /* Send IEEE 802.11 encapsulated frame using the master radio device */
 304         skb->dev = local->dev;
 305         dev_queue_xmit(skb);
 306         return NETDEV_TX_OK;
 307 }
 308
 309
 310 /* Called only from software IRQ */
 311 static struct sk_buff * hostap_tx_encrypt(struct sk_buff *skb,
 312                                           struct lib80211_crypt_data *crypt)
 313 {
 314         struct hostap_interface *iface;
 315         local_info_t *local;
 316         struct ieee80211_hdr *hdr;
 317         int prefix_len, postfix_len, hdr_len, res;
 318
 319         iface = netdev_priv(skb->dev);
 320         local = iface->local;
 321
 322         if (skb->len < IEEE80211_DATA_HDR3_LEN) {
 323                 kfree_skb(skb);
 324                 return NULL;
 325         }
 326
 327         if (local->tkip_countermeasures &&
 328             strcmp(crypt->ops->name, "TKIP") == 0) {
 329                 hdr = (struct ieee80211_hdr *) skb->data;
 330                 if (net_ratelimit()) {
 331                         printk(KERN_DEBUG "%s: TKIP countermeasures: dropped "
 332                                "TX packet to %pM\n",
 333                                local->dev->name, hdr->addr1);
 334                 }
 335                 kfree_skb(skb);
 336                 return NULL;
 337         }
 338
 339         skb = skb_unshare(skb, GFP_ATOMIC);
 340         if (skb == NULL)
 341                 return NULL;
 342
 343         prefix_len = crypt->ops->extra_mpdu_prefix_len +
 344                 crypt->ops->extra_msdu_prefix_len;
 345         postfix_len = crypt->ops->extra_mpdu_postfix_len +
 346                 crypt->ops->extra_msdu_postfix_len;
 347         if ((skb_headroom(skb) < prefix_len ||
 348              skb_tailroom(skb) < postfix_len) &&
 349             pskb_expand_head(skb, prefix_len, postfix_len, GFP_ATOMIC)) {
 350                 kfree_skb(skb);
 351                 return NULL;
 352         }
 353
 354         hdr = (struct ieee80211_hdr *) skb->data;
 355         hdr_len = hostap_80211_get_hdrlen(hdr->frame_control);
 356
 357         /* Host-based IEEE 802.11 fragmentation for TX is not yet supported, so
 358          * call both MSDU and MPDU encryption functions from here. */
 359         atomic_inc(&crypt->refcnt);
 360         res = 0;
 361         if (crypt->ops->encrypt_msdu)
 362                 res = crypt->ops->encrypt_msdu(skb, hdr_len, crypt->priv);
 363         if (res == 0 && crypt->ops->encrypt_mpdu)
 364                 res = crypt->ops->encrypt_mpdu(skb, hdr_len, crypt->priv);
 365         atomic_dec(&crypt->refcnt);
 366         if (res < 0) {
 367                 kfree_skb(skb);
 368                 return NULL;
 369         }
 370
 371         return skb;
 372 }
 373
 374
 375 /* hard_start_xmit function for master radio interface wifi#.
 376  * AP processing (TX rate control, power save buffering, etc.).
 377  * Use hardware TX function to send the frame. */
 378 netdev_tx_t hostap_master_start_xmit(struct sk_buff *skb,
 379                                      struct net_device *dev)
 380 {
 381         struct hostap_interface *iface;
 382         local_info_t *local;
 383         netdev_tx_t ret = NETDEV_TX_BUSY;
 384         u16 fc;
 385         struct hostap_tx_data tx;
 386         ap_tx_ret tx_ret;
 387         struct hostap_skb_tx_data *meta;
 388         int no_encrypt = 0;
 389         struct ieee80211_hdr *hdr;
 390
 391         iface = netdev_priv(dev);
 392         local = iface->local;
 393
 394         tx.skb = skb;
 395         tx.sta_ptr = NULL;
 396
 397         meta = (struct hostap_skb_tx_data *) skb->cb;
 398         if (meta->magic != HOSTAP_SKB_TX_DATA_MAGIC) {
 399                 printk(KERN_DEBUG "%s: invalid skb->cb magic (0x%08x, "
 400                        "expected 0x%08x)\n",
 401                        dev->name, meta->magic, HOSTAP_SKB_TX_DATA_MAGIC);
 402                 ret = NETDEV_TX_OK;
 403                 iface->stats.tx_dropped++;
 404                 goto fail;
 405         }
 406
 407         if (local->host_encrypt) {
 408                 /* Set crypt to default algorithm and key; will be replaced in
 409                  * AP code if STA has own alg/key */
 410                 tx.crypt = local->crypt_info.crypt[local->crypt_info.tx_keyidx];
 411                 tx.host_encrypt = 1;
 412         } else {
 413                 tx.crypt = NULL;
 414                 tx.host_encrypt = 0;
 415         }
 416
 417         if (skb->len < 24) {
 418                 printk(KERN_DEBUG "%s: hostap_master_start_xmit: short skb "
 419                        "(len=%d)\n", dev->name, skb->len);
 420                 ret = NETDEV_TX_OK;
 421                 iface->stats.tx_dropped++;
 422                 goto fail;
 423         }
 424
 425         /* FIX (?):
 426          * Wi-Fi 802.11b test plan suggests that AP should ignore power save
 427          * bit in authentication and (re)association frames and assume tha
 428          * STA remains awake for the response. */
 429         tx_ret = hostap_handle_sta_tx(local, &tx);
 430         skb = tx.skb;
 431         meta = (struct hostap_skb_tx_data *) skb->cb;
 432         hdr = (struct ieee80211_hdr *) skb->data;
 433         fc = le16_to_cpu(hdr->frame_control);
 434         switch (tx_ret) {
 435         case AP_TX_CONTINUE:
 436                 break;
 437         case AP_TX_CONTINUE_NOT_AUTHORIZED:
 438                 if (local->ieee_802_1x &&
 439                     ieee80211_is_data(hdr->frame_control) &&
 440                     meta->ethertype != ETH_P_PAE &&
 441                     !(meta->flags & HOSTAP_TX_FLAGS_WDS)) {
 442                         printk(KERN_DEBUG "%s: dropped frame to unauthorized "
 443                                "port (IEEE 802.1X): ethertype=0x%04x\n",
 444                                dev->name, meta->ethertype);
 445                         hostap_dump_tx_80211(dev->name, skb);
 446
 447                         ret = NETDEV_TX_OK; /* drop packet */
 448                         iface->stats.tx_dropped++;
 449                         goto fail;
 450                 }
 451                 break;
 452         case AP_TX_DROP:
 453                 ret = NETDEV_TX_OK; /* drop packet */
 454                 iface->stats.tx_dropped++;
 455                 goto fail;
 456         case AP_TX_RETRY:
 457                 goto fail;
 458         case AP_TX_BUFFERED:
 459                 /* do not free skb here, it will be freed when the
 460                  * buffered frame is sent/timed out */
 461                 ret = NETDEV_TX_OK;
 462                 goto tx_exit;
 463         }
 464
 465         /* Request TX callback if protocol version is 2 in 802.11 header;
 466          * this version 2 is a special case used between hostapd and kernel
 467          * driver */
 468         if (((fc & IEEE80211_FCTL_VERS) == BIT(1)) &&
 469             local->ap && local->ap->tx_callback_idx && meta->tx_cb_idx == 0) {
 470                 meta->tx_cb_idx = local->ap->tx_callback_idx;
 471
 472                 /* remove special version from the frame header */
 473                 fc &= ~IEEE80211_FCTL_VERS;
 474                 hdr->frame_control = cpu_to_le16(fc);
 475         }
 476
 477         if (!ieee80211_is_data(hdr->frame_control)) {
 478                 no_encrypt = 1;
 479                 tx.crypt = NULL;
 480         }
 481
 482         if (local->ieee_802_1x && meta->ethertype == ETH_P_PAE && tx.crypt &&
 483             !(fc & IEEE80211_FCTL_PROTECTED)) {
 484                 no_encrypt = 1;
 485                 PDEBUG(DEBUG_EXTRA2, "%s: TX: IEEE 802.1X - passing "
 486                        "unencrypted EAPOL frame\n", dev->name);
 487                 tx.crypt = NULL; /* no encryption for IEEE 802.1X frames */
 488         }
 489
 490         if (tx.crypt && (!tx.crypt->ops || !tx.crypt->ops->encrypt_mpdu))
 491                 tx.crypt = NULL;
 492         else if ((tx.crypt ||
 493                  local->crypt_info.crypt[local->crypt_info.tx_keyidx]) &&
 494                  !no_encrypt) {
 495                 /* Add ISWEP flag both for firmware and host based encryption
 496                  */
 497                 fc |= IEEE80211_FCTL_PROTECTED;
 498                 hdr->frame_control = cpu_to_le16(fc);
 499         } else if (local->drop_unencrypted &&
 500                    ieee80211_is_data(hdr->frame_control) &&
 501                    meta->ethertype != ETH_P_PAE) {
 502                 if (net_ratelimit()) {
 503                         printk(KERN_DEBUG "%s: dropped unencrypted TX data "
 504                                "frame (drop_unencrypted=1)\n", dev->name);
 505                 }
 506                 iface->stats.tx_dropped++;
 507                 ret = NETDEV_TX_OK;
 508                 goto fail;
 509         }
 510
 511         if (tx.crypt) {
 512                 skb = hostap_tx_encrypt(skb, tx.crypt);
 513                 if (skb == NULL) {
 514                         printk(KERN_DEBUG "%s: TX - encryption failed\n",
 515                                dev->name);
 516                         ret = NETDEV_TX_OK;
 517                         goto fail;
 518                 }
 519                 meta = (struct hostap_skb_tx_data *) skb->cb;
 520                 if (meta->magic != HOSTAP_SKB_TX_DATA_MAGIC) {
 521                         printk(KERN_DEBUG "%s: invalid skb->cb magic (0x%08x, "
 522                                "expected 0x%08x) after hostap_tx_encrypt\n",
 523                                dev->name, meta->magic,
 524                                HOSTAP_SKB_TX_DATA_MAGIC);
 525                         ret = NETDEV_TX_OK;
 526                         iface->stats.tx_dropped++;
 527                         goto fail;
 528                 }
 529         }
 530
 531         if (local->func->tx == NULL || local->func->tx(skb, dev)) {
 532                 ret = NETDEV_TX_OK;
 533                 iface->stats.tx_dropped++;
 534         } else {
 535                 ret = NETDEV_TX_OK;
 536                 iface->stats.tx_packets++;
 537                 iface->stats.tx_bytes += skb->len;
 538         }
 539
 540  fail:
 541         if (ret == NETDEV_TX_OK && skb)
 542                 dev_kfree_skb(skb);
 543  tx_exit:
 544         if (tx.sta_ptr)
 545                 hostap_handle_sta_release(tx.sta_ptr);
 546         return ret;
 547 }
 548
 549
 550 EXPORT_SYMBOL(hostap_master_start_xmit);