LXR linux/drivers/net/wireless/hostap/hostap_80211

   1#include <linux/slab.h>
   2
   3#include "hostap_80211.h"
   4#include "hostap_common.h"
   5#include "hostap_wlan.h"
   6#include "hostap.h"
   7#include "hostap_ap.h"
   8
   9/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
  10/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
  11static unsigned char rfc1042_header[] =
  12{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
  13/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
  14static unsigned char bridge_tunnel_header[] =
  15{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
  16/* No encapsulation header if EtherType < 0x600 (=length) */
  17
  18void hostap_dump_tx_80211(const char *name, struct sk_buff *skb)
  19{
  20        struct ieee80211_hdr *hdr;
  21        u16 fc;
  22
  23        hdr = (struct ieee80211_hdr *) skb->data;
  24
  25        printk(KERN_DEBUG "%s: TX len=%d jiffies=%ld\n",
  26               name, skb->len, jiffies);
  27
  28        if (skb->len < 2)
  29                return;
  30
  31        fc = le16_to_cpu(hdr->frame_control);
  32        printk(KERN_DEBUG "   FC=0x%04x (type=%d:%d)%s%s",
  33               fc, (fc & IEEE80211_FCTL_FTYPE) >> 2,
  34               (fc & IEEE80211_FCTL_STYPE) >> 4,
  35               fc & IEEE80211_FCTL_TODS ? " [ToDS]" : "",
  36               fc & IEEE80211_FCTL_FROMDS ? " [FromDS]" : "");
  37
  38        if (skb->len < IEEE80211_DATA_HDR3_LEN) {
  39                printk("\n");
  40                return;
  41        }
  42
  43        printk(" dur=0x%04x seq=0x%04x\n", le16_to_cpu(hdr->duration_id),
  44               le16_to_cpu(hdr->seq_ctrl));
  45
  46        printk(KERN_DEBUG "   A1=%pM", hdr->addr1);
  47        printk(" A2=%pM", hdr->addr2);
  48        printk(" A3=%pM", hdr->addr3);
  49        if (skb->len >= 30)
  50                printk(" A4=%pM", hdr->addr4);
  51        printk("\n");
  52}
  53
  54
  55/* hard_start_xmit function for data interfaces (wlan#, wlan#wds#, wlan#sta)
  56 * Convert Ethernet header into a suitable IEEE 802.11 header depending on
  57 * device configuration. */
  58netdev_tx_t hostap_data_start_xmit(struct sk_buff *skb,
  59                                   struct net_device *dev)
  60{
  61        struct hostap_interface *iface;
  62        local_info_t *local;
  63        int need_headroom, need_tailroom = 0;
  64        struct ieee80211_hdr hdr;
  65        u16 fc, ethertype = 0;
  66        enum {
  67                WDS_NO = 0, WDS_OWN_FRAME, WDS_COMPLIANT_FRAME
  68        } use_wds = WDS_NO;
  69        u8 *encaps_data;
  70        int hdr_len, encaps_len, skip_header_bytes;
  71        int to_assoc_ap = 0;
  72        struct hostap_skb_tx_data *meta;
  73
  74        iface = netdev_priv(dev);
  75        local = iface->local;
  76
  77        if (skb->len < ETH_HLEN) {
  78                printk(KERN_DEBUG "%s: hostap_data_start_xmit: short skb "
  79                       "(len=%d)\n", dev->name, skb->len);
  80                kfree_skb(skb);
  81                return NETDEV_TX_OK;
  82        }
  83
  84        if (local->ddev != dev) {
  85                use_wds = (local->iw_mode == IW_MODE_MASTER &&
  86                           !(local->wds_type & HOSTAP_WDS_STANDARD_FRAME)) ?
  87                        WDS_OWN_FRAME : WDS_COMPLIANT_FRAME;
  88                if (dev == local->stadev) {
  89                        to_assoc_ap = 1;
  90                        use_wds = WDS_NO;
  91                } else if (dev == local->apdev) {
  92                        printk(KERN_DEBUG "%s: prism2_tx: trying to use "
  93                               "AP device with Ethernet net dev\n", dev->name);
  94                        kfree_skb(skb);
  95                        return NETDEV_TX_OK;
  96                }
  97        } else {
  98                if (local->iw_mode == IW_MODE_REPEAT) {
  99                        printk(KERN_DEBUG "%s: prism2_tx: trying to use "
 100                               "non-WDS link in Repeater mode\n", dev->name);
 101                        kfree_skb(skb);
 102                        return NETDEV_TX_OK;
 103                } else if (local->iw_mode == IW_MODE_INFRA &&
 104                           (local->wds_type & HOSTAP_WDS_AP_CLIENT) &&
 105                           memcmp(skb->data + ETH_ALEN, dev->dev_addr,
 106                                  ETH_ALEN) != 0) {
 107                        /* AP client mode: send frames with foreign src addr
 108                         * using 4-addr WDS frames */
 109                        use_wds = WDS_COMPLIANT_FRAME;
 110                }
 111        }
 112
 113        /* Incoming skb->data: dst_addr[6], src_addr[6], proto[2], payload
 114         * ==>
 115         * Prism2 TX frame with 802.11 header:
 116         * txdesc (address order depending on used mode; includes dst_addr and
 117         * src_addr), possible encapsulation (RFC1042/Bridge-Tunnel;
 118         * proto[2], payload {, possible addr4[6]} */
 119
 120        ethertype = (skb->data[12] << 8) | skb->data[13];
 121
 122        memset(&hdr, 0, sizeof(hdr));
 123
 124        /* Length of data after IEEE 802.11 header */
 125        encaps_data = NULL;
 126        encaps_len = 0;
 127        skip_header_bytes = ETH_HLEN;
 128        if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
 129                encaps_data = bridge_tunnel_header;
 130                encaps_len = sizeof(bridge_tunnel_header);
 131                skip_header_bytes -= 2;
 132        } else if (ethertype >= 0x600) {
 133                encaps_data = rfc1042_header;
 134                encaps_len = sizeof(rfc1042_header);
 135                skip_header_bytes -= 2;
 136        }
 137
 138        fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
 139        hdr_len = IEEE80211_DATA_HDR3_LEN;
 140
 141        if (use_wds != WDS_NO) {
 142                /* Note! Prism2 station firmware has problems with sending real
 143                 * 802.11 frames with four addresses; until these problems can
 144                 * be fixed or worked around, 4-addr frames needed for WDS are
 145                 * using incompatible format: FromDS flag is not set and the
 146                 * fourth address is added after the frame payload; it is
 147                 * assumed, that the receiving station knows how to handle this
 148                 * frame format */
 149
 150                if (use_wds == WDS_COMPLIANT_FRAME) {
 151                        fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
 152                        /* From&To DS: Addr1 = RA, Addr2 = TA, Addr3 = DA,
 153                         * Addr4 = SA */
 154                        skb_copy_from_linear_data_offset(skb, ETH_ALEN,
 155                                                         &hdr.addr4, ETH_ALEN);
 156                        hdr_len += ETH_ALEN;
 157                } else {
 158                        /* bogus 4-addr format to workaround Prism2 station
 159                         * f/w bug */
 160                        fc |= IEEE80211_FCTL_TODS;
 161                        /* From DS: Addr1 = DA (used as RA),
 162                         * Addr2 = BSSID (used as TA), Addr3 = SA (used as DA),
 163                         */
 164
 165                        /* SA from skb->data + ETH_ALEN will be added after
 166                         * frame payload; use hdr.addr4 as a temporary buffer
 167                         */
 168                        skb_copy_from_linear_data_offset(skb, ETH_ALEN,
 169                                                         &hdr.addr4, ETH_ALEN);
 170                        need_tailroom += ETH_ALEN;
 171                }
 172
 173                /* send broadcast and multicast frames to broadcast RA, if
 174                 * configured; otherwise, use unicast RA of the WDS link */
 175                if ((local->wds_type & HOSTAP_WDS_BROADCAST_RA) &&
 176                    skb->data[0] & 0x01)
 177                        memset(&hdr.addr1, 0xff, ETH_ALEN);
 178                else if (iface->type == HOSTAP_INTERFACE_WDS)
 179                        memcpy(&hdr.addr1, iface->u.wds.remote_addr,
 180                               ETH_ALEN);
 181                else
 182                        memcpy(&hdr.addr1, local->bssid, ETH_ALEN);
 183                memcpy(&hdr.addr2, dev->dev_addr, ETH_ALEN);
 184                skb_copy_from_linear_data(skb, &hdr.addr3, ETH_ALEN);
 185        } else if (local->iw_mode == IW_MODE_MASTER && !to_assoc_ap) {
 186                fc |= IEEE80211_FCTL_FROMDS;
 187                /* From DS: Addr1 = DA, Addr2 = BSSID, Addr3 = SA */
 188                skb_copy_from_linear_data(skb, &hdr.addr1, ETH_ALEN);
 189                memcpy(&hdr.addr2, dev->dev_addr, ETH_ALEN);
 190                skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr3,
 191                                                 ETH_ALEN);
 192        } else if (local->iw_mode == IW_MODE_INFRA || to_assoc_ap) {
 193                fc |= IEEE80211_FCTL_TODS;
 194                /* To DS: Addr1 = BSSID, Addr2 = SA, Addr3 = DA */
 195                memcpy(&hdr.addr1, to_assoc_ap ?
 196                       local->assoc_ap_addr : local->bssid, ETH_ALEN);
 197                skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr2,
 198                                                 ETH_ALEN);
 199                skb_copy_from_linear_data(skb, &hdr.addr3, ETH_ALEN);
 200        } else if (local->iw_mode == IW_MODE_ADHOC) {
 201                /* not From/To DS: Addr1 = DA, Addr2 = SA, Addr3 = BSSID */
 202                skb_copy_from_linear_data(skb, &hdr.addr1, ETH_ALEN);
 203                skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr2,
 204                                                 ETH_ALEN);
 205                memcpy(&hdr.addr3, local->bssid, ETH_ALEN);
 206        }
 207
 208        hdr.frame_control = cpu_to_le16(fc);
 209
 210        skb_pull(skb, skip_header_bytes);
 211        need_headroom = local->func->need_tx_headroom + hdr_len + encaps_len;
 212        if (skb_tailroom(skb) < need_tailroom) {
 213                skb = skb_unshare(skb, GFP_ATOMIC);
 214                if (skb == NULL) {
 215                        iface->stats.tx_dropped++;
 216                        return NETDEV_TX_OK;
 217                }
 218                if (pskb_expand_head(skb, need_headroom, need_tailroom,
 219                                     GFP_ATOMIC)) {
 220                        kfree_skb(skb);
 221                        iface->stats.tx_dropped++;
 222                        return NETDEV_TX_OK;
 223                }
 224        } else if (skb_headroom(skb) < need_headroom) {
 225                struct sk_buff *tmp = skb;
 226                skb = skb_realloc_headroom(skb, need_headroom);
 227                kfree_skb(tmp);
 228                if (skb == NULL) {
 229                        iface->stats.tx_dropped++;
 230                        return NETDEV_TX_OK;
 231                }
 232        } else {
 233                skb = skb_unshare(skb, GFP_ATOMIC);
 234                if (skb == NULL) {
 235                        iface->stats.tx_dropped++;
 236                        return NETDEV_TX_OK;
 237                }
 238        }
 239
 240        if (encaps_data)
 241                memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
 242        memcpy(skb_push(skb, hdr_len), &hdr, hdr_len);
 243        if (use_wds == WDS_OWN_FRAME) {
 244                memcpy(skb_put(skb, ETH_ALEN), &hdr.addr4, ETH_ALEN);
 245        }
 246
 247        iface->stats.tx_packets++;
 248        iface->stats.tx_bytes += skb->len;
 249
 250        skb_reset_mac_header(skb);
 251        meta = (struct hostap_skb_tx_data *) skb->cb;
 252        memset(meta, 0, sizeof(*meta));
 253        meta->magic = HOSTAP_SKB_TX_DATA_MAGIC;
 254        if (use_wds)
 255                meta->flags |= HOSTAP_TX_FLAGS_WDS;
 256        meta->ethertype = ethertype;
 257        meta->iface = iface;
 258
 259        /* Send IEEE 802.11 encapsulated frame using the master radio device */
 260        skb->dev = local->dev;
 261        dev_queue_xmit(skb);
 262        return NETDEV_TX_OK;
 263}
 264
 265
 266/* hard_start_xmit function for hostapd wlan#ap interfaces */
 267netdev_tx_t hostap_mgmt_start_xmit(struct sk_buff *skb,
 268                                   struct net_device *dev)
 269{
 270        struct hostap_interface *iface;
 271        local_info_t *local;
 272        struct hostap_skb_tx_data *meta;
 273        struct ieee80211_hdr *hdr;
 274        u16 fc;
 275
 276        iface = netdev_priv(dev);
 277        local = iface->local;
 278
 279        if (skb->len < 10) {
 280                printk(KERN_DEBUG "%s: hostap_mgmt_start_xmit: short skb "
 281                       "(len=%d)\n", dev->name, skb->len);
 282                kfree_skb(skb);
 283                return NETDEV_TX_OK;
 284        }
 285
 286        iface->stats.tx_packets++;
 287        iface->stats.tx_bytes += skb->len;
 288
 289        meta = (struct hostap_skb_tx_data *) skb->cb;
 290        memset(meta, 0, sizeof(*meta));
 291        meta->magic = HOSTAP_SKB_TX_DATA_MAGIC;
 292        meta->iface = iface;
 293
 294        if (skb->len >= IEEE80211_DATA_HDR3_LEN + sizeof(rfc1042_header) + 2) {
 295                hdr = (struct ieee80211_hdr *) skb->data;
 296                fc = le16_to_cpu(hdr->frame_control);
 297                if (ieee80211_is_data(hdr->frame_control) &&
 298                    (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DATA) {
 299                        u8 *pos = &skb->data[IEEE80211_DATA_HDR3_LEN +
 300                                             sizeof(rfc1042_header)];
 301                        meta->ethertype = (pos[0] << 8) | pos[1];
 302                }
 303        }
 304
 305        /* Send IEEE 802.11 encapsulated frame using the master radio device */
 306        skb->dev = local->dev;
 307        dev_queue_xmit(skb);
 308        return NETDEV_TX_OK;
 309}
 310
 311
 312/* Called only from software IRQ */
 313static struct sk_buff * hostap_tx_encrypt(struct sk_buff *skb,
 314                                          struct lib80211_crypt_data *crypt)
 315{
 316        struct hostap_interface *iface;
 317        local_info_t *local;
 318        struct ieee80211_hdr *hdr;
 319        int prefix_len, postfix_len, hdr_len, res;
 320
 321        iface = netdev_priv(skb->dev);
 322        local = iface->local;
 323
 324        if (skb->len < IEEE80211_DATA_HDR3_LEN) {
 325                kfree_skb(skb);
 326                return NULL;
 327        }
 328
 329        if (local->tkip_countermeasures &&
 330            strcmp(crypt->ops->name, "TKIP") == 0) {
 331                hdr = (struct ieee80211_hdr *) skb->data;
 332                if (net_ratelimit()) {
 333                        printk(KERN_DEBUG "%s: TKIP countermeasures: dropped "
 334                               "TX packet to %pM\n",
 335                               local->dev->name, hdr->addr1);
 336                }
 337                kfree_skb(skb);
 338                return NULL;
 339        }
 340
 341        skb = skb_unshare(skb, GFP_ATOMIC);
 342        if (skb == NULL)
 343                return NULL;
 344
 345        prefix_len = crypt->ops->extra_mpdu_prefix_len +
 346                crypt->ops->extra_msdu_prefix_len;
 347        postfix_len = crypt->ops->extra_mpdu_postfix_len +
 348                crypt->ops->extra_msdu_postfix_len;
 349        if ((skb_headroom(skb) < prefix_len ||
 350             skb_tailroom(skb) < postfix_len) &&
 351            pskb_expand_head(skb, prefix_len, postfix_len, GFP_ATOMIC)) {
 352                kfree_skb(skb);
 353                return NULL;
 354        }
 355
 356        hdr = (struct ieee80211_hdr *) skb->data;
 357        hdr_len = hostap_80211_get_hdrlen(hdr->frame_control);
 358
 359        /* Host-based IEEE 802.11 fragmentation for TX is not yet supported, so
 360         * call both MSDU and MPDU encryption functions from here. */
 361        atomic_inc(&crypt->refcnt);
 362        res = 0;
 363        if (crypt->ops->encrypt_msdu)
 364                res = crypt->ops->encrypt_msdu(skb, hdr_len, crypt->priv);
 365        if (res == 0 && crypt->ops->encrypt_mpdu)
 366                res = crypt->ops->encrypt_mpdu(skb, hdr_len, crypt->priv);
 367        atomic_dec(&crypt->refcnt);
 368        if (res < 0) {
 369                kfree_skb(skb);
 370                return NULL;
 371        }
 372
 373        return skb;
 374}
 375
 376
 377/* hard_start_xmit function for master radio interface wifi#.
 378 * AP processing (TX rate control, power save buffering, etc.).
 379 * Use hardware TX function to send the frame. */
 380netdev_tx_t hostap_master_start_xmit(struct sk_buff *skb,
 381                                     struct net_device *dev)
 382{
 383        struct hostap_interface *iface;
 384        local_info_t *local;
 385        netdev_tx_t ret = NETDEV_TX_BUSY;
 386        u16 fc;
 387        struct hostap_tx_data tx;
 388        ap_tx_ret tx_ret;
 389        struct hostap_skb_tx_data *meta;
 390        int no_encrypt = 0;
 391        struct ieee80211_hdr *hdr;
 392
 393        iface = netdev_priv(dev);
 394        local = iface->local;
 395
 396        tx.skb = skb;
 397        tx.sta_ptr = NULL;
 398
 399        meta = (struct hostap_skb_tx_data *) skb->cb;
 400        if (meta->magic != HOSTAP_SKB_TX_DATA_MAGIC) {
 401                printk(KERN_DEBUG "%s: invalid skb->cb magic (0x%08x, "
 402                       "expected 0x%08x)\n",
 403                       dev->name, meta->magic, HOSTAP_SKB_TX_DATA_MAGIC);
 404                ret = NETDEV_TX_OK;
 405                iface->stats.tx_dropped++;
 406                goto fail;
 407        }
 408
 409        if (local->host_encrypt) {
 410                /* Set crypt to default algorithm and key; will be replaced in
 411                 * AP code if STA has own alg/key */
 412                tx.crypt = local->crypt_info.crypt[local->crypt_info.tx_keyidx];
 413                tx.host_encrypt = 1;
 414        } else {
 415                tx.crypt = NULL;
 416                tx.host_encrypt = 0;
 417        }
 418
 419        if (skb->len < 24) {
 420                printk(KERN_DEBUG "%s: hostap_master_start_xmit: short skb "
 421                       "(len=%d)\n", dev->name, skb->len);
 422                ret = NETDEV_TX_OK;
 423                iface->stats.tx_dropped++;
 424                goto fail;
 425        }
 426
 427        /* FIX (?):
 428         * Wi-Fi 802.11b test plan suggests that AP should ignore power save
 429         * bit in authentication and (re)association frames and assume tha
 430         * STA remains awake for the response. */
 431        tx_ret = hostap_handle_sta_tx(local, &tx);
 432        skb = tx.skb;
 433        meta = (struct hostap_skb_tx_data *) skb->cb;
 434        hdr = (struct ieee80211_hdr *) skb->data;
 435        fc = le16_to_cpu(hdr->frame_control);
 436        switch (tx_ret) {
 437        case AP_TX_CONTINUE:
 438                break;
 439        case AP_TX_CONTINUE_NOT_AUTHORIZED:
 440                if (local->ieee_802_1x &&
 441                    ieee80211_is_data(hdr->frame_control) &&
 442                    meta->ethertype != ETH_P_PAE &&
 443                    !(meta->flags & HOSTAP_TX_FLAGS_WDS)) {
 444                        printk(KERN_DEBUG "%s: dropped frame to unauthorized "
 445                               "port (IEEE 802.1X): ethertype=0x%04x\n",
 446                               dev->name, meta->ethertype);
 447                        hostap_dump_tx_80211(dev->name, skb);
 448
 449                        ret = NETDEV_TX_OK; /* drop packet */
 450                        iface->stats.tx_dropped++;
 451                        goto fail;
 452                }
 453                break;
 454        case AP_TX_DROP:
 455                ret = NETDEV_TX_OK; /* drop packet */
 456                iface->stats.tx_dropped++;
 457                goto fail;
 458        case AP_TX_RETRY:
 459                goto fail;
 460        case AP_TX_BUFFERED:
 461                /* do not free skb here, it will be freed when the
 462                 * buffered frame is sent/timed out */
 463                ret = NETDEV_TX_OK;
 464                goto tx_exit;
 465        }
 466
 467        /* Request TX callback if protocol version is 2 in 802.11 header;
 468         * this version 2 is a special case used between hostapd and kernel
 469         * driver */
 470        if (((fc & IEEE80211_FCTL_VERS) == BIT(1)) &&
 471            local->ap && local->ap->tx_callback_idx && meta->tx_cb_idx == 0) {
 472                meta->tx_cb_idx = local->ap->tx_callback_idx;
 473
 474                /* remove special version from the frame header */
 475                fc &= ~IEEE80211_FCTL_VERS;
 476                hdr->frame_control = cpu_to_le16(fc);
 477        }
 478
 479        if (!ieee80211_is_data(hdr->frame_control)) {
 480                no_encrypt = 1;
 481                tx.crypt = NULL;
 482        }
 483
 484        if (local->ieee_802_1x && meta->ethertype == ETH_P_PAE && tx.crypt &&
 485            !(fc & IEEE80211_FCTL_PROTECTED)) {
 486                no_encrypt = 1;
 487                PDEBUG(DEBUG_EXTRA2, "%s: TX: IEEE 802.1X - passing "
 488                       "unencrypted EAPOL frame\n", dev->name);
 489                tx.crypt = NULL; /* no encryption for IEEE 802.1X frames */
 490        }
 491
 492        if (tx.crypt && (!tx.crypt->ops || !tx.crypt->ops->encrypt_mpdu))
 493                tx.crypt = NULL;
 494        else if ((tx.crypt ||
 495                 local->crypt_info.crypt[local->crypt_info.tx_keyidx]) &&
 496                 !no_encrypt) {
 497                /* Add ISWEP flag both for firmware and host based encryption
 498                 */
 499                fc |= IEEE80211_FCTL_PROTECTED;
 500                hdr->frame_control = cpu_to_le16(fc);
 501        } else if (local->drop_unencrypted &&
 502                   ieee80211_is_data(hdr->frame_control) &&
 503                   meta->ethertype != ETH_P_PAE) {
 504                if (net_ratelimit()) {
 505                        printk(KERN_DEBUG "%s: dropped unencrypted TX data "
 506                               "frame (drop_unencrypted=1)\n", dev->name);
 507                }
 508                iface->stats.tx_dropped++;
 509                ret = NETDEV_TX_OK;
 510                goto fail;
 511        }
 512
 513        if (tx.crypt) {
 514                skb = hostap_tx_encrypt(skb, tx.crypt);
 515                if (skb == NULL) {
 516                        printk(KERN_DEBUG "%s: TX - encryption failed\n",
 517                               dev->name);
 518                        ret = NETDEV_TX_OK;
 519                        goto fail;
 520                }
 521                meta = (struct hostap_skb_tx_data *) skb->cb;
 522                if (meta->magic != HOSTAP_SKB_TX_DATA_MAGIC) {
 523                        printk(KERN_DEBUG "%s: invalid skb->cb magic (0x%08x, "
 524                               "expected 0x%08x) after hostap_tx_encrypt\n",
 525                               dev->name, meta->magic,
 526                               HOSTAP_SKB_TX_DATA_MAGIC);
 527                        ret = NETDEV_TX_OK;
 528                        iface->stats.tx_dropped++;
 529                        goto fail;
 530                }
 531        }
 532
 533        if (local->func->tx == NULL || local->func->tx(skb, dev)) {
 534                ret = NETDEV_TX_OK;
 535                iface->stats.tx_dropped++;
 536        } else {
 537                ret = NETDEV_TX_OK;
 538                iface->stats.tx_packets++;
 539                iface->stats.tx_bytes += skb->len;
 540        }
 541
 542 fail:
 543        if (ret == NETDEV_TX_OK && skb)
 544                dev_kfree_skb(skb);
 545 tx_exit:
 546        if (tx.sta_ptr)
 547                hostap_handle_sta_release(tx.sta_ptr);
 548        return ret;
 549}
 550
 551
 552EXPORT_SYMBOL(hostap_master_start_xmit);
 553