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

   1#include <linux/slab.h>
   2#include <linux/export.h>
   3#include <linux/etherdevice.h>
   4
   5#include "hostap_80211.h"
   6#include "hostap_common.h"
   7#include "hostap_wlan.h"
   8#include "hostap.h"
   9#include "hostap_ap.h"
  10
  11/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
  12/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
  13static unsigned char rfc1042_header[] =
  14{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
  15/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
  16static unsigned char bridge_tunnel_header[] =
  17{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
  18/* No encapsulation header if EtherType < 0x600 (=length) */
  19
  20void hostap_dump_tx_80211(const char *name, struct sk_buff *skb)
  21{
  22        struct ieee80211_hdr *hdr;
  23        u16 fc;
  24
  25        hdr = (struct ieee80211_hdr *) skb->data;
  26
  27        printk(KERN_DEBUG "%s: TX len=%d jiffies=%ld\n",
  28               name, skb->len, jiffies);
  29
  30        if (skb->len < 2)
  31                return;
  32
  33        fc = le16_to_cpu(hdr->frame_control);
  34        printk(KERN_DEBUG "   FC=0x%04x (type=%d:%d)%s%s",
  35               fc, (fc & IEEE80211_FCTL_FTYPE) >> 2,
  36               (fc & IEEE80211_FCTL_STYPE) >> 4,
  37               fc & IEEE80211_FCTL_TODS ? " [ToDS]" : "",
  38               fc & IEEE80211_FCTL_FROMDS ? " [FromDS]" : "");
  39
  40        if (skb->len < IEEE80211_DATA_HDR3_LEN) {
  41                printk("\n");
  42                return;
  43        }
  44
  45        printk(" dur=0x%04x seq=0x%04x\n", le16_to_cpu(hdr->duration_id),
  46               le16_to_cpu(hdr->seq_ctrl));
  47
  48        printk(KERN_DEBUG "   A1=%pM", hdr->addr1);
  49        printk(" A2=%pM", hdr->addr2);
  50        printk(" A3=%pM", hdr->addr3);
  51        if (skb->len >= 30)
  52                printk(" A4=%pM", hdr->addr4);
  53        printk("\n");
  54}
  55
  56
  57/* hard_start_xmit function for data interfaces (wlan#, wlan#wds#, wlan#sta)
  58 * Convert Ethernet header into a suitable IEEE 802.11 header depending on
  59 * device configuration. */
  60netdev_tx_t hostap_data_start_xmit(struct sk_buff *skb,
  61                                   struct net_device *dev)
  62{
  63        struct hostap_interface *iface;
  64        local_info_t *local;
  65        int need_headroom, need_tailroom = 0;
  66        struct ieee80211_hdr hdr;
  67        u16 fc, ethertype = 0;
  68        enum {
  69                WDS_NO = 0, WDS_OWN_FRAME, WDS_COMPLIANT_FRAME
  70        } use_wds = WDS_NO;
  71        u8 *encaps_data;
  72        int hdr_len, encaps_len, skip_header_bytes;
  73        int to_assoc_ap = 0;
  74        struct hostap_skb_tx_data *meta;
  75
  76        iface = netdev_priv(dev);
  77        local = iface->local;
  78
  79        if (skb->len < ETH_HLEN) {
  80                printk(KERN_DEBUG "%s: hostap_data_start_xmit: short skb "
  81                       "(len=%d)\n", dev->name, skb->len);
  82                kfree_skb(skb);
  83                return NETDEV_TX_OK;
  84        }
  85
  86        if (local->ddev != dev) {
  87                use_wds = (local->iw_mode == IW_MODE_MASTER &&
  88                           !(local->wds_type & HOSTAP_WDS_STANDARD_FRAME)) ?
  89                        WDS_OWN_FRAME : WDS_COMPLIANT_FRAME;
  90                if (dev == local->stadev) {
  91                        to_assoc_ap = 1;
  92                        use_wds = WDS_NO;
  93                } else if (dev == local->apdev) {
  94                        printk(KERN_DEBUG "%s: prism2_tx: trying to use "
  95                               "AP device with Ethernet net dev\n", dev->name);
  96                        kfree_skb(skb);
  97                        return NETDEV_TX_OK;
  98                }
  99        } else {
 100                if (local->iw_mode == IW_MODE_REPEAT) {
 101                        printk(KERN_DEBUG "%s: prism2_tx: trying to use "
 102                               "non-WDS link in Repeater mode\n", dev->name);
 103                        kfree_skb(skb);
 104                        return NETDEV_TX_OK;
 105                } else if (local->iw_mode == IW_MODE_INFRA &&
 106                           (local->wds_type & HOSTAP_WDS_AP_CLIENT) &&
 107                           !ether_addr_equal(skb->data + ETH_ALEN, dev->dev_addr)) {
 108                        /* AP client mode: send frames with foreign src addr
 109                         * using 4-addr WDS frames */
 110                        use_wds = WDS_COMPLIANT_FRAME;
 111                }
 112        }
 113
 114        /* Incoming skb->data: dst_addr[6], src_addr[6], proto[2], payload
 115         * ==>
 116         * Prism2 TX frame with 802.11 header:
 117         * txdesc (address order depending on used mode; includes dst_addr and
 118         * src_addr), possible encapsulation (RFC1042/Bridge-Tunnel;
 119         * proto[2], payload {, possible addr4[6]} */
 120
 121        ethertype = (skb->data[12] << 8) | skb->data[13];
 122
 123        memset(&hdr, 0, sizeof(hdr));
 124
 125        /* Length of data after IEEE 802.11 header */
 126        encaps_data = NULL;
 127        encaps_len = 0;
 128        skip_header_bytes = ETH_HLEN;
 129        if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
 130                encaps_data = bridge_tunnel_header;
 131                encaps_len = sizeof(bridge_tunnel_header);
 132                skip_header_bytes -= 2;
 133        } else if (ethertype >= 0x600) {
 134                encaps_data = rfc1042_header;
 135                encaps_len = sizeof(rfc1042_header);
 136                skip_header_bytes -= 2;
 137        }
 138
 139        fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
 140        hdr_len = IEEE80211_DATA_HDR3_LEN;
 141
 142        if (use_wds != WDS_NO) {
 143                /* Note! Prism2 station firmware has problems with sending real
 144                 * 802.11 frames with four addresses; until these problems can
 145                 * be fixed or worked around, 4-addr frames needed for WDS are
 146                 * using incompatible format: FromDS flag is not set and the
 147                 * fourth address is added after the frame payload; it is
 148                 * assumed, that the receiving station knows how to handle this
 149                 * frame format */
 150
 151                if (use_wds == WDS_COMPLIANT_FRAME) {
 152                        fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
 153                        /* From&To DS: Addr1 = RA, Addr2 = TA, Addr3 = DA,
 154                         * Addr4 = SA */
 155                        skb_copy_from_linear_data_offset(skb, ETH_ALEN,
 156                                                         &hdr.addr4, ETH_ALEN);
 157                        hdr_len += ETH_ALEN;
 158                } else {
 159                        /* bogus 4-addr format to workaround Prism2 station
 160                         * f/w bug */
 161                        fc |= IEEE80211_FCTL_TODS;
 162                        /* From DS: Addr1 = DA (used as RA),
 163                         * Addr2 = BSSID (used as TA), Addr3 = SA (used as DA),
 164                         */
 165
 166                        /* SA from skb->data + ETH_ALEN will be added after
 167                         * frame payload; use hdr.addr4 as a temporary buffer
 168                         */
 169                        skb_copy_from_linear_data_offset(skb, ETH_ALEN,
 170                                                         &hdr.addr4, ETH_ALEN);
 171                        need_tailroom += ETH_ALEN;
 172                }
 173
 174                /* send broadcast and multicast frames to broadcast RA, if
 175                 * configured; otherwise, use unicast RA of the WDS link */
 176                if ((local->wds_type & HOSTAP_WDS_BROADCAST_RA) &&
 177                    is_multicast_ether_addr(skb->data))
 178                        eth_broadcast_addr(hdr.addr1);
 179                else if (iface->type == HOSTAP_INTERFACE_WDS)
 180                        memcpy(&hdr.addr1, iface->u.wds.remote_addr,
 181                               ETH_ALEN);
 182                else
 183                        memcpy(&hdr.addr1, local->bssid, ETH_ALEN);
 184                memcpy(&hdr.addr2, dev->dev_addr, ETH_ALEN);
 185                skb_copy_from_linear_data(skb, &hdr.addr3, ETH_ALEN);
 186        } else if (local->iw_mode == IW_MODE_MASTER && !to_assoc_ap) {
 187                fc |= IEEE80211_FCTL_FROMDS;
 188                /* From DS: Addr1 = DA, Addr2 = BSSID, Addr3 = SA */
 189                skb_copy_from_linear_data(skb, &hdr.addr1, ETH_ALEN);
 190                memcpy(&hdr.addr2, dev->dev_addr, ETH_ALEN);
 191                skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr3,
 192                                                 ETH_ALEN);
 193        } else if (local->iw_mode == IW_MODE_INFRA || to_assoc_ap) {
 194                fc |= IEEE80211_FCTL_TODS;
 195                /* To DS: Addr1 = BSSID, Addr2 = SA, Addr3 = DA */
 196                memcpy(&hdr.addr1, to_assoc_ap ?
 197                       local->assoc_ap_addr : local->bssid, ETH_ALEN);
 198                skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr2,
 199                                                 ETH_ALEN);
 200                skb_copy_from_linear_data(skb, &hdr.addr3, ETH_ALEN);
 201        } else if (local->iw_mode == IW_MODE_ADHOC) {
 202                /* not From/To DS: Addr1 = DA, Addr2 = SA, Addr3 = BSSID */
 203                skb_copy_from_linear_data(skb, &hdr.addr1, ETH_ALEN);
 204                skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr2,
 205                                                 ETH_ALEN);
 206                memcpy(&hdr.addr3, local->bssid, ETH_ALEN);
 207        }
 208
 209        hdr.frame_control = cpu_to_le16(fc);
 210
 211        skb_pull(skb, skip_header_bytes);
 212        need_headroom = local->func->need_tx_headroom + hdr_len + encaps_len;
 213        if (skb_tailroom(skb) < need_tailroom) {
 214                skb = skb_unshare(skb, GFP_ATOMIC);
 215                if (skb == NULL) {
 216                        iface->stats.tx_dropped++;
 217                        return NETDEV_TX_OK;
 218                }
 219                if (pskb_expand_head(skb, need_headroom, need_tailroom,
 220                                     GFP_ATOMIC)) {
 221                        kfree_skb(skb);
 222                        iface->stats.tx_dropped++;
 223                        return NETDEV_TX_OK;
 224                }
 225        } else if (skb_headroom(skb) < need_headroom) {
 226                struct sk_buff *tmp = skb;
 227                skb = skb_realloc_headroom(skb, need_headroom);
 228                kfree_skb(tmp);
 229                if (skb == NULL) {
 230                        iface->stats.tx_dropped++;
 231                        return NETDEV_TX_OK;
 232                }
 233        } else {
 234                skb = skb_unshare(skb, GFP_ATOMIC);
 235                if (skb == NULL) {
 236                        iface->stats.tx_dropped++;
 237                        return NETDEV_TX_OK;
 238                }
 239        }
 240
 241        if (encaps_data)
 242                memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
 243        memcpy(skb_push(skb, hdr_len), &hdr, hdr_len);
 244        if (use_wds == WDS_OWN_FRAME) {
 245                memcpy(skb_put(skb, ETH_ALEN), &hdr.addr4, ETH_ALEN);
 246        }
 247
 248        iface->stats.tx_packets++;
 249        iface->stats.tx_bytes += skb->len;
 250
 251        skb_reset_mac_header(skb);
 252        meta = (struct hostap_skb_tx_data *) skb->cb;
 253        memset(meta, 0, sizeof(*meta));
 254        meta->magic = HOSTAP_SKB_TX_DATA_MAGIC;
 255        if (use_wds)
 256                meta->flags |= HOSTAP_TX_FLAGS_WDS;
 257        meta->ethertype = ethertype;
 258        meta->iface = iface;
 259
 260        /* Send IEEE 802.11 encapsulated frame using the master radio device */
 261        skb->dev = local->dev;
 262        dev_queue_xmit(skb);
 263        return NETDEV_TX_OK;
 264}
 265
 266
 267/* hard_start_xmit function for hostapd wlan#ap interfaces */
 268netdev_tx_t hostap_mgmt_start_xmit(struct sk_buff *skb,
 269                                   struct net_device *dev)
 270{
 271        struct hostap_interface *iface;
 272        local_info_t *local;
 273        struct hostap_skb_tx_data *meta;
 274        struct ieee80211_hdr *hdr;
 275        u16 fc;
 276
 277        iface = netdev_priv(dev);
 278        local = iface->local;
 279
 280        if (skb->len < 10) {
 281                printk(KERN_DEBUG "%s: hostap_mgmt_start_xmit: short skb "
 282                       "(len=%d)\n", dev->name, skb->len);
 283                kfree_skb(skb);
 284                return NETDEV_TX_OK;
 285        }
 286
 287        iface->stats.tx_packets++;
 288        iface->stats.tx_bytes += skb->len;
 289
 290        meta = (struct hostap_skb_tx_data *) skb->cb;
 291        memset(meta, 0, sizeof(*meta));
 292        meta->magic = HOSTAP_SKB_TX_DATA_MAGIC;
 293        meta->iface = iface;
 294
 295        if (skb->len >= IEEE80211_DATA_HDR3_LEN + sizeof(rfc1042_header) + 2) {
 296                hdr = (struct ieee80211_hdr *) skb->data;
 297                fc = le16_to_cpu(hdr->frame_control);
 298                if (ieee80211_is_data(hdr->frame_control) &&
 299                    (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DATA) {
 300                        u8 *pos = &skb->data[IEEE80211_DATA_HDR3_LEN +
 301                                             sizeof(rfc1042_header)];
 302                        meta->ethertype = (pos[0] << 8) | pos[1];
 303                }
 304        }
 305
 306        /* Send IEEE 802.11 encapsulated frame using the master radio device */
 307        skb->dev = local->dev;
 308        dev_queue_xmit(skb);
 309        return NETDEV_TX_OK;
 310}
 311
 312
 313/* Called only from software IRQ */
 314static struct sk_buff * hostap_tx_encrypt(struct sk_buff *skb,
 315                                          struct lib80211_crypt_data *crypt)
 316{
 317        struct hostap_interface *iface;
 318        local_info_t *local;
 319        struct ieee80211_hdr *hdr;
 320        int prefix_len, postfix_len, hdr_len, res;
 321
 322        iface = netdev_priv(skb->dev);
 323        local = iface->local;
 324
 325        if (skb->len < IEEE80211_DATA_HDR3_LEN) {
 326                kfree_skb(skb);
 327                return NULL;
 328        }
 329
 330        if (local->tkip_countermeasures &&
 331            strcmp(crypt->ops->name, "TKIP") == 0) {
 332                hdr = (struct ieee80211_hdr *) skb->data;
 333                if (net_ratelimit()) {
 334                        printk(KERN_DEBUG "%s: TKIP countermeasures: dropped "
 335                               "TX packet to %pM\n",
 336                               local->dev->name, hdr->addr1);
 337                }
 338                kfree_skb(skb);
 339                return NULL;
 340        }
 341
 342        skb = skb_unshare(skb, GFP_ATOMIC);
 343        if (skb == NULL)
 344                return NULL;
 345
 346        prefix_len = crypt->ops->extra_mpdu_prefix_len +
 347                crypt->ops->extra_msdu_prefix_len;
 348        postfix_len = crypt->ops->extra_mpdu_postfix_len +
 349                crypt->ops->extra_msdu_postfix_len;
 350        if ((skb_headroom(skb) < prefix_len ||
 351             skb_tailroom(skb) < postfix_len) &&
 352            pskb_expand_head(skb, prefix_len, postfix_len, GFP_ATOMIC)) {
 353                kfree_skb(skb);
 354                return NULL;
 355        }
 356
 357        hdr = (struct ieee80211_hdr *) skb->data;
 358        hdr_len = hostap_80211_get_hdrlen(hdr->frame_control);
 359
 360        /* Host-based IEEE 802.11 fragmentation for TX is not yet supported, so
 361         * call both MSDU and MPDU encryption functions from here. */
 362        atomic_inc(&crypt->refcnt);
 363        res = 0;
 364        if (crypt->ops->encrypt_msdu)
 365                res = crypt->ops->encrypt_msdu(skb, hdr_len, crypt->priv);
 366        if (res == 0 && crypt->ops->encrypt_mpdu)
 367                res = crypt->ops->encrypt_mpdu(skb, hdr_len, crypt->priv);
 368        atomic_dec(&crypt->refcnt);
 369        if (res < 0) {
 370                kfree_skb(skb);
 371                return NULL;
 372        }
 373
 374        return skb;
 375}
 376
 377
 378/* hard_start_xmit function for master radio interface wifi#.
 379 * AP processing (TX rate control, power save buffering, etc.).
 380 * Use hardware TX function to send the frame. */
 381netdev_tx_t hostap_master_start_xmit(struct sk_buff *skb,
 382                                     struct net_device *dev)
 383{
 384        struct hostap_interface *iface;
 385        local_info_t *local;
 386        netdev_tx_t ret = NETDEV_TX_BUSY;
 387        u16 fc;
 388        struct hostap_tx_data tx;
 389        ap_tx_ret tx_ret;
 390        struct hostap_skb_tx_data *meta;
 391        int no_encrypt = 0;
 392        struct ieee80211_hdr *hdr;
 393
 394        iface = netdev_priv(dev);
 395        local = iface->local;
 396
 397        tx.skb = skb;
 398        tx.sta_ptr = NULL;
 399
 400        meta = (struct hostap_skb_tx_data *) skb->cb;
 401        if (meta->magic != HOSTAP_SKB_TX_DATA_MAGIC) {
 402                printk(KERN_DEBUG "%s: invalid skb->cb magic (0x%08x, "
 403                       "expected 0x%08x)\n",
 404                       dev->name, meta->magic, HOSTAP_SKB_TX_DATA_MAGIC);
 405                ret = NETDEV_TX_OK;
 406                iface->stats.tx_dropped++;
 407                goto fail;
 408        }
 409
 410        if (local->host_encrypt) {
 411                /* Set crypt to default algorithm and key; will be replaced in
 412                 * AP code if STA has own alg/key */
 413                tx.crypt = local->crypt_info.crypt[local->crypt_info.tx_keyidx];
 414                tx.host_encrypt = 1;
 415        } else {
 416                tx.crypt = NULL;
 417                tx.host_encrypt = 0;
 418        }
 419
 420        if (skb->len < 24) {
 421                printk(KERN_DEBUG "%s: hostap_master_start_xmit: short skb "
 422                       "(len=%d)\n", dev->name, skb->len);
 423                ret = NETDEV_TX_OK;
 424                iface->stats.tx_dropped++;
 425                goto fail;
 426        }
 427
 428        /* FIX (?):
 429         * Wi-Fi 802.11b test plan suggests that AP should ignore power save
 430         * bit in authentication and (re)association frames and assume tha
 431         * STA remains awake for the response. */
 432        tx_ret = hostap_handle_sta_tx(local, &tx);
 433        skb = tx.skb;
 434        meta = (struct hostap_skb_tx_data *) skb->cb;
 435        hdr = (struct ieee80211_hdr *) skb->data;
 436        fc = le16_to_cpu(hdr->frame_control);
 437        switch (tx_ret) {
 438        case AP_TX_CONTINUE:
 439                break;
 440        case AP_TX_CONTINUE_NOT_AUTHORIZED:
 441                if (local->ieee_802_1x &&
 442                    ieee80211_is_data(hdr->frame_control) &&
 443                    meta->ethertype != ETH_P_PAE &&
 444                    !(meta->flags & HOSTAP_TX_FLAGS_WDS)) {
 445                        printk(KERN_DEBUG "%s: dropped frame to unauthorized "
 446                               "port (IEEE 802.1X): ethertype=0x%04x\n",
 447                               dev->name, meta->ethertype);
 448                        hostap_dump_tx_80211(dev->name, skb);
 449
 450                        ret = NETDEV_TX_OK; /* drop packet */
 451                        iface->stats.tx_dropped++;
 452                        goto fail;
 453                }
 454                break;
 455        case AP_TX_DROP:
 456                ret = NETDEV_TX_OK; /* drop packet */
 457                iface->stats.tx_dropped++;
 458                goto fail;
 459        case AP_TX_RETRY:
 460                goto fail;
 461        case AP_TX_BUFFERED:
 462                /* do not free skb here, it will be freed when the
 463                 * buffered frame is sent/timed out */
 464                ret = NETDEV_TX_OK;
 465                goto tx_exit;
 466        }
 467
 468        /* Request TX callback if protocol version is 2 in 802.11 header;
 469         * this version 2 is a special case used between hostapd and kernel
 470         * driver */
 471        if (((fc & IEEE80211_FCTL_VERS) == BIT(1)) &&
 472            local->ap && local->ap->tx_callback_idx && meta->tx_cb_idx == 0) {
 473                meta->tx_cb_idx = local->ap->tx_callback_idx;
 474
 475                /* remove special version from the frame header */
 476                fc &= ~IEEE80211_FCTL_VERS;
 477                hdr->frame_control = cpu_to_le16(fc);
 478        }
 479
 480        if (!ieee80211_is_data(hdr->frame_control)) {
 481                no_encrypt = 1;
 482                tx.crypt = NULL;
 483        }
 484
 485        if (local->ieee_802_1x && meta->ethertype == ETH_P_PAE && tx.crypt &&
 486            !(fc & IEEE80211_FCTL_PROTECTED)) {
 487                no_encrypt = 1;
 488                PDEBUG(DEBUG_EXTRA2, "%s: TX: IEEE 802.1X - passing "
 489                       "unencrypted EAPOL frame\n", dev->name);
 490                tx.crypt = NULL; /* no encryption for IEEE 802.1X frames */
 491        }
 492
 493        if (tx.crypt && (!tx.crypt->ops || !tx.crypt->ops->encrypt_mpdu))
 494                tx.crypt = NULL;
 495        else if ((tx.crypt ||
 496                 local->crypt_info.crypt[local->crypt_info.tx_keyidx]) &&
 497                 !no_encrypt) {
 498                /* Add ISWEP flag both for firmware and host based encryption
 499                 */
 500                fc |= IEEE80211_FCTL_PROTECTED;
 501                hdr->frame_control = cpu_to_le16(fc);
 502        } else if (local->drop_unencrypted &&
 503                   ieee80211_is_data(hdr->frame_control) &&
 504                   meta->ethertype != ETH_P_PAE) {
 505                if (net_ratelimit()) {
 506                        printk(KERN_DEBUG "%s: dropped unencrypted TX data "
 507                               "frame (drop_unencrypted=1)\n", dev->name);
 508                }
 509                iface->stats.tx_dropped++;
 510                ret = NETDEV_TX_OK;
 511                goto fail;
 512        }
 513
 514        if (tx.crypt) {
 515                skb = hostap_tx_encrypt(skb, tx.crypt);
 516                if (skb == NULL) {
 517                        printk(KERN_DEBUG "%s: TX - encryption failed\n",
 518                               dev->name);
 519                        ret = NETDEV_TX_OK;
 520                        goto fail;
 521                }
 522                meta = (struct hostap_skb_tx_data *) skb->cb;
 523                if (meta->magic != HOSTAP_SKB_TX_DATA_MAGIC) {
 524                        printk(KERN_DEBUG "%s: invalid skb->cb magic (0x%08x, "
 525                               "expected 0x%08x) after hostap_tx_encrypt\n",
 526                               dev->name, meta->magic,
 527                               HOSTAP_SKB_TX_DATA_MAGIC);
 528                        ret = NETDEV_TX_OK;
 529                        iface->stats.tx_dropped++;
 530                        goto fail;
 531                }
 532        }
 533
 534        if (local->func->tx == NULL || local->func->tx(skb, dev)) {
 535                ret = NETDEV_TX_OK;
 536                iface->stats.tx_dropped++;
 537        } else {
 538                ret = NETDEV_TX_OK;
 539                iface->stats.tx_packets++;
 540                iface->stats.tx_bytes += skb->len;
 541        }
 542
 543 fail:
 544        if (ret == NETDEV_TX_OK && skb)
 545                dev_kfree_skb(skb);
 546 tx_exit:
 547        if (tx.sta_ptr)
 548                hostap_handle_sta_release(tx.sta_ptr);
 549        return ret;
 550}
 551
 552
 553EXPORT_SYMBOL(hostap_master_start_xmit);
 554