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

   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/slab.h>
   3#include <linux/export.h>
   4#include <linux/etherdevice.h>
   5
   6#include "hostap_80211.h"
   7#include "hostap_common.h"
   8#include "hostap_wlan.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) */
  14static unsigned char rfc1042_header[] =
  15{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
  16/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
  17static unsigned char bridge_tunnel_header[] =
  18{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
  19/* No encapsulation header if EtherType < 0x600 (=length) */
  20
  21void hostap_dump_tx_80211(const char *name, struct sk_buff *skb)
  22{
  23        struct ieee80211_hdr *hdr;
  24        u16 fc;
  25
  26        hdr = (struct ieee80211_hdr *) skb->data;
  27
  28        printk(KERN_DEBUG "%s: TX len=%d jiffies=%ld\n",
  29               name, skb->len, jiffies);
  30
  31        if (skb->len < 2)
  32                return;
  33
  34        fc = le16_to_cpu(hdr->frame_control);
  35        printk(KERN_DEBUG "   FC=0x%04x (type=%d:%d)%s%s",
  36               fc, (fc & IEEE80211_FCTL_FTYPE) >> 2,
  37               (fc & IEEE80211_FCTL_STYPE) >> 4,
  38               fc & IEEE80211_FCTL_TODS ? " [ToDS]" : "",
  39               fc & IEEE80211_FCTL_FROMDS ? " [FromDS]" : "");
  40
  41        if (skb->len < IEEE80211_DATA_HDR3_LEN) {
  42                printk("\n");
  43                return;
  44        }
  45
  46        printk(" dur=0x%04x seq=0x%04x\n", le16_to_cpu(hdr->duration_id),
  47               le16_to_cpu(hdr->seq_ctrl));
  48
  49        printk(KERN_DEBUG "   A1=%pM", hdr->addr1);
  50        printk(" A2=%pM", hdr->addr2);
  51        printk(" A3=%pM", hdr->addr3);
  52        if (skb->len >= 30)
  53                printk(" A4=%pM", hdr->addr4);
  54        printk("\n");
  55}
  56
  57
  58/* hard_start_xmit function for data interfaces (wlan#, wlan#wds#, wlan#sta)
  59 * Convert Ethernet header into a suitable IEEE 802.11 header depending on
  60 * device configuration. */
  61netdev_tx_t hostap_data_start_xmit(struct sk_buff *skb,
  62                                   struct net_device *dev)
  63{
  64        struct hostap_interface *iface;
  65        local_info_t *local;
  66        int need_headroom, need_tailroom = 0;
  67        struct ieee80211_hdr hdr;
  68        u16 fc, ethertype = 0;
  69        enum {
  70                WDS_NO = 0, WDS_OWN_FRAME, WDS_COMPLIANT_FRAME
  71        } use_wds = WDS_NO;
  72        u8 *encaps_data;
  73        int hdr_len, encaps_len, skip_header_bytes;
  74        int to_assoc_ap = 0;
  75        struct hostap_skb_tx_data *meta;
  76
  77        iface = netdev_priv(dev);
  78        local = iface->local;
  79
  80        if (skb->len < ETH_HLEN) {
  81                printk(KERN_DEBUG "%s: hostap_data_start_xmit: short skb "
  82                       "(len=%d)\n", dev->name, skb->len);
  83                kfree_skb(skb);
  84                return NETDEV_TX_OK;
  85        }
  86
  87        if (local->ddev != dev) {
  88                use_wds = (local->iw_mode == IW_MODE_MASTER &&
  89                           !(local->wds_type & HOSTAP_WDS_STANDARD_FRAME)) ?
  90                        WDS_OWN_FRAME : WDS_COMPLIANT_FRAME;
  91                if (dev == local->stadev) {
  92                        to_assoc_ap = 1;
  93                        use_wds = WDS_NO;
  94                } else if (dev == local->apdev) {
  95                        printk(KERN_DEBUG "%s: prism2_tx: trying to use "
  96                               "AP device with Ethernet net dev\n", dev->name);
  97                        kfree_skb(skb);
  98                        return NETDEV_TX_OK;
  99                }
 100        } else {
 101                if (local->iw_mode == IW_MODE_REPEAT) {
 102                        printk(KERN_DEBUG "%s: prism2_tx: trying to use "
 103                               "non-WDS link in Repeater mode\n", dev->name);
 104                        kfree_skb(skb);
 105                        return NETDEV_TX_OK;
 106                } else if (local->iw_mode == IW_MODE_INFRA &&
 107                           (local->wds_type & HOSTAP_WDS_AP_CLIENT) &&
 108                           !ether_addr_equal(skb->data + ETH_ALEN, dev->dev_addr)) {
 109                        /* AP client mode: send frames with foreign src addr
 110                         * using 4-addr WDS frames */
 111                        use_wds = WDS_COMPLIANT_FRAME;
 112                }
 113        }
 114
 115        /* Incoming skb->data: dst_addr[6], src_addr[6], proto[2], payload
 116         * ==>
 117         * Prism2 TX frame with 802.11 header:
 118         * txdesc (address order depending on used mode; includes dst_addr and
 119         * src_addr), possible encapsulation (RFC1042/Bridge-Tunnel;
 120         * proto[2], payload {, possible addr4[6]} */
 121
 122        ethertype = (skb->data[12] << 8) | skb->data[13];
 123
 124        memset(&hdr, 0, sizeof(hdr));
 125
 126        /* Length of data after IEEE 802.11 header */
 127        encaps_data = NULL;
 128        encaps_len = 0;
 129        skip_header_bytes = ETH_HLEN;
 130        if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
 131                encaps_data = bridge_tunnel_header;
 132                encaps_len = sizeof(bridge_tunnel_header);
 133                skip_header_bytes -= 2;
 134        } else if (ethertype >= 0x600) {
 135                encaps_data = rfc1042_header;
 136                encaps_len = sizeof(rfc1042_header);
 137                skip_header_bytes -= 2;
 138        }
 139
 140        fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
 141        hdr_len = IEEE80211_DATA_HDR3_LEN;
 142
 143        if (use_wds != WDS_NO) {
 144                /* Note! Prism2 station firmware has problems with sending real
 145                 * 802.11 frames with four addresses; until these problems can
 146                 * be fixed or worked around, 4-addr frames needed for WDS are
 147                 * using incompatible format: FromDS flag is not set and the
 148                 * fourth address is added after the frame payload; it is
 149                 * assumed, that the receiving station knows how to handle this
 150                 * frame format */
 151
 152                if (use_wds == WDS_COMPLIANT_FRAME) {
 153                        fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
 154                        /* From&To DS: Addr1 = RA, Addr2 = TA, Addr3 = DA,
 155                         * Addr4 = SA */
 156                        skb_copy_from_linear_data_offset(skb, ETH_ALEN,
 157                                                         &hdr.addr4, ETH_ALEN);
 158                        hdr_len += ETH_ALEN;
 159                } else {
 160                        /* bogus 4-addr format to workaround Prism2 station
 161                         * f/w bug */
 162                        fc |= IEEE80211_FCTL_TODS;
 163                        /* From DS: Addr1 = DA (used as RA),
 164                         * Addr2 = BSSID (used as TA), Addr3 = SA (used as DA),
 165                         */
 166
 167                        /* SA from skb->data + ETH_ALEN will be added after
 168                         * frame payload; use hdr.addr4 as a temporary buffer
 169                         */
 170                        skb_copy_from_linear_data_offset(skb, ETH_ALEN,
 171                                                         &hdr.addr4, ETH_ALEN);
 172                        need_tailroom += ETH_ALEN;
 173                }
 174
 175                /* send broadcast and multicast frames to broadcast RA, if
 176                 * configured; otherwise, use unicast RA of the WDS link */
 177                if ((local->wds_type & HOSTAP_WDS_BROADCAST_RA) &&
 178                    is_multicast_ether_addr(skb->data))
 179                        eth_broadcast_addr(hdr.addr1);
 180                else if (iface->type == HOSTAP_INTERFACE_WDS)
 181                        memcpy(&hdr.addr1, iface->u.wds.remote_addr,
 182                               ETH_ALEN);
 183                else
 184                        memcpy(&hdr.addr1, local->bssid, ETH_ALEN);
 185                memcpy(&hdr.addr2, dev->dev_addr, ETH_ALEN);
 186                skb_copy_from_linear_data(skb, &hdr.addr3, ETH_ALEN);
 187        } else if (local->iw_mode == IW_MODE_MASTER && !to_assoc_ap) {
 188                fc |= IEEE80211_FCTL_FROMDS;
 189                /* From DS: Addr1 = DA, Addr2 = BSSID, Addr3 = SA */
 190                skb_copy_from_linear_data(skb, &hdr.addr1, ETH_ALEN);
 191                memcpy(&hdr.addr2, dev->dev_addr, ETH_ALEN);
 192                skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr3,
 193                                                 ETH_ALEN);
 194        } else if (local->iw_mode == IW_MODE_INFRA || to_assoc_ap) {
 195                fc |= IEEE80211_FCTL_TODS;
 196                /* To DS: Addr1 = BSSID, Addr2 = SA, Addr3 = DA */
 197                memcpy(&hdr.addr1, to_assoc_ap ?
 198                       local->assoc_ap_addr : local->bssid, ETH_ALEN);
 199                skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr2,
 200                                                 ETH_ALEN);
 201                skb_copy_from_linear_data(skb, &hdr.addr3, ETH_ALEN);
 202        } else if (local->iw_mode == IW_MODE_ADHOC) {
 203                /* not From/To DS: Addr1 = DA, Addr2 = SA, Addr3 = BSSID */
 204                skb_copy_from_linear_data(skb, &hdr.addr1, ETH_ALEN);
 205                skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr2,
 206                                                 ETH_ALEN);
 207                memcpy(&hdr.addr3, local->bssid, ETH_ALEN);
 208        }
 209
 210        hdr.frame_control = cpu_to_le16(fc);
 211
 212        skb_pull(skb, skip_header_bytes);
 213        need_headroom = local->func->need_tx_headroom + hdr_len + encaps_len;
 214        if (skb_tailroom(skb) < need_tailroom) {
 215                skb = skb_unshare(skb, GFP_ATOMIC);
 216                if (skb == NULL) {
 217                        iface->stats.tx_dropped++;
 218                        return NETDEV_TX_OK;
 219                }
 220                if (pskb_expand_head(skb, need_headroom, need_tailroom,
 221                                     GFP_ATOMIC)) {
 222                        kfree_skb(skb);
 223                        iface->stats.tx_dropped++;
 224                        return NETDEV_TX_OK;
 225                }
 226        } else if (skb_headroom(skb) < need_headroom) {
 227                struct sk_buff *tmp = skb;
 228                skb = skb_realloc_headroom(skb, need_headroom);
 229                kfree_skb(tmp);
 230                if (skb == NULL) {
 231                        iface->stats.tx_dropped++;
 232                        return NETDEV_TX_OK;
 233                }
 234        } else {
 235                skb = skb_unshare(skb, GFP_ATOMIC);
 236                if (skb == NULL) {
 237                        iface->stats.tx_dropped++;
 238                        return NETDEV_TX_OK;
 239                }
 240        }
 241
 242        if (encaps_data)
 243                memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
 244        memcpy(skb_push(skb, hdr_len), &hdr, hdr_len);
 245        if (use_wds == WDS_OWN_FRAME) {
 246                skb_put_data(skb, &hdr.addr4, ETH_ALEN);
 247        }
 248
 249        iface->stats.tx_packets++;
 250        iface->stats.tx_bytes += skb->len;
 251
 252        skb_reset_mac_header(skb);
 253        meta = (struct hostap_skb_tx_data *) skb->cb;
 254        memset(meta, 0, sizeof(*meta));
 255        meta->magic = HOSTAP_SKB_TX_DATA_MAGIC;
 256        if (use_wds)
 257                meta->flags |= HOSTAP_TX_FLAGS_WDS;
 258        meta->ethertype = ethertype;
 259        meta->iface = iface;
 260
 261        /* Send IEEE 802.11 encapsulated frame using the master radio device */
 262        skb->dev = local->dev;
 263        dev_queue_xmit(skb);
 264        return NETDEV_TX_OK;
 265}
 266
 267
 268/* hard_start_xmit function for hostapd wlan#ap interfaces */
 269netdev_tx_t hostap_mgmt_start_xmit(struct sk_buff *skb,
 270                                   struct net_device *dev)
 271{
 272        struct hostap_interface *iface;
 273        local_info_t *local;
 274        struct hostap_skb_tx_data *meta;
 275        struct ieee80211_hdr *hdr;
 276        u16 fc;
 277
 278        iface = netdev_priv(dev);
 279        local = iface->local;
 280
 281        if (skb->len < 10) {
 282                printk(KERN_DEBUG "%s: hostap_mgmt_start_xmit: short skb "
 283                       "(len=%d)\n", dev->name, skb->len);
 284                kfree_skb(skb);
 285                return NETDEV_TX_OK;
 286        }
 287
 288        iface->stats.tx_packets++;
 289        iface->stats.tx_bytes += skb->len;
 290
 291        meta = (struct hostap_skb_tx_data *) skb->cb;
 292        memset(meta, 0, sizeof(*meta));
 293        meta->magic = HOSTAP_SKB_TX_DATA_MAGIC;
 294        meta->iface = iface;
 295
 296        if (skb->len >= IEEE80211_DATA_HDR3_LEN + sizeof(rfc1042_header) + 2) {
 297                hdr = (struct ieee80211_hdr *) skb->data;
 298                fc = le16_to_cpu(hdr->frame_control);
 299                if (ieee80211_is_data(hdr->frame_control) &&
 300                    (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DATA) {
 301                        u8 *pos = &skb->data[IEEE80211_DATA_HDR3_LEN +
 302                                             sizeof(rfc1042_header)];
 303                        meta->ethertype = (pos[0] << 8) | pos[1];
 304                }
 305        }
 306
 307        /* Send IEEE 802.11 encapsulated frame using the master radio device */
 308        skb->dev = local->dev;
 309        dev_queue_xmit(skb);
 310        return NETDEV_TX_OK;
 311}
 312
 313
 314/* Called only from software IRQ */
 315static struct sk_buff * hostap_tx_encrypt(struct sk_buff *skb,
 316                                          struct lib80211_crypt_data *crypt)
 317{
 318        struct hostap_interface *iface;
 319        local_info_t *local;
 320        struct ieee80211_hdr *hdr;
 321        int prefix_len, postfix_len, hdr_len, res;
 322
 323        iface = netdev_priv(skb->dev);
 324        local = iface->local;
 325
 326        if (skb->len < IEEE80211_DATA_HDR3_LEN) {
 327                kfree_skb(skb);
 328                return NULL;
 329        }
 330
 331        if (local->tkip_countermeasures &&
 332            strcmp(crypt->ops->name, "TKIP") == 0) {
 333                hdr = (struct ieee80211_hdr *) skb->data;
 334                if (net_ratelimit()) {
 335                        printk(KERN_DEBUG "%s: TKIP countermeasures: dropped "
 336                               "TX packet to %pM\n",
 337                               local->dev->name, hdr->addr1);
 338                }
 339                kfree_skb(skb);
 340                return NULL;
 341        }
 342
 343        skb = skb_unshare(skb, GFP_ATOMIC);
 344        if (skb == NULL)
 345                return NULL;
 346
 347        prefix_len = crypt->ops->extra_mpdu_prefix_len +
 348                crypt->ops->extra_msdu_prefix_len;
 349        postfix_len = crypt->ops->extra_mpdu_postfix_len +
 350                crypt->ops->extra_msdu_postfix_len;
 351        if ((skb_headroom(skb) < prefix_len ||
 352             skb_tailroom(skb) < postfix_len) &&
 353            pskb_expand_head(skb, prefix_len, postfix_len, GFP_ATOMIC)) {
 354                kfree_skb(skb);
 355                return NULL;
 356        }
 357
 358        hdr = (struct ieee80211_hdr *) skb->data;
 359        hdr_len = hostap_80211_get_hdrlen(hdr->frame_control);
 360
 361        /* Host-based IEEE 802.11 fragmentation for TX is not yet supported, so
 362         * call both MSDU and MPDU encryption functions from here. */
 363        atomic_inc(&crypt->refcnt);
 364        res = 0;
 365        if (crypt->ops->encrypt_msdu)
 366                res = crypt->ops->encrypt_msdu(skb, hdr_len, crypt->priv);
 367        if (res == 0 && crypt->ops->encrypt_mpdu)
 368                res = crypt->ops->encrypt_mpdu(skb, hdr_len, crypt->priv);
 369        atomic_dec(&crypt->refcnt);
 370        if (res < 0) {
 371                kfree_skb(skb);
 372                return NULL;
 373        }
 374
 375        return skb;
 376}
 377
 378
 379/* hard_start_xmit function for master radio interface wifi#.
 380 * AP processing (TX rate control, power save buffering, etc.).
 381 * Use hardware TX function to send the frame. */
 382netdev_tx_t hostap_master_start_xmit(struct sk_buff *skb,
 383                                     struct net_device *dev)
 384{
 385        struct hostap_interface *iface;
 386        local_info_t *local;
 387        netdev_tx_t ret = NETDEV_TX_BUSY;
 388        u16 fc;
 389        struct hostap_tx_data tx;
 390        ap_tx_ret tx_ret;
 391        struct hostap_skb_tx_data *meta;
 392        int no_encrypt = 0;
 393        struct ieee80211_hdr *hdr;
 394
 395        iface = netdev_priv(dev);
 396        local = iface->local;
 397
 398        tx.skb = skb;
 399        tx.sta_ptr = NULL;
 400
 401        meta = (struct hostap_skb_tx_data *) skb->cb;
 402        if (meta->magic != HOSTAP_SKB_TX_DATA_MAGIC) {
 403                printk(KERN_DEBUG "%s: invalid skb->cb magic (0x%08x, "
 404                       "expected 0x%08x)\n",
 405                       dev->name, meta->magic, HOSTAP_SKB_TX_DATA_MAGIC);
 406                ret = NETDEV_TX_OK;
 407                iface->stats.tx_dropped++;
 408                goto fail;
 409        }
 410
 411        if (local->host_encrypt) {
 412                /* Set crypt to default algorithm and key; will be replaced in
 413                 * AP code if STA has own alg/key */
 414                tx.crypt = local->crypt_info.crypt[local->crypt_info.tx_keyidx];
 415                tx.host_encrypt = 1;
 416        } else {
 417                tx.crypt = NULL;
 418                tx.host_encrypt = 0;
 419        }
 420
 421        if (skb->len < 24) {
 422                printk(KERN_DEBUG "%s: hostap_master_start_xmit: short skb "
 423                       "(len=%d)\n", dev->name, skb->len);
 424                ret = NETDEV_TX_OK;
 425                iface->stats.tx_dropped++;
 426                goto fail;
 427        }
 428
 429        /* FIX (?):
 430         * Wi-Fi 802.11b test plan suggests that AP should ignore power save
 431         * bit in authentication and (re)association frames and assume tha
 432         * STA remains awake for the response. */
 433        tx_ret = hostap_handle_sta_tx(local, &tx);
 434        skb = tx.skb;
 435        meta = (struct hostap_skb_tx_data *) skb->cb;
 436        hdr = (struct ieee80211_hdr *) skb->data;
 437        fc = le16_to_cpu(hdr->frame_control);
 438        switch (tx_ret) {
 439        case AP_TX_CONTINUE:
 440                break;
 441        case AP_TX_CONTINUE_NOT_AUTHORIZED:
 442                if (local->ieee_802_1x &&
 443                    ieee80211_is_data(hdr->frame_control) &&
 444                    meta->ethertype != ETH_P_PAE &&
 445                    !(meta->flags & HOSTAP_TX_FLAGS_WDS)) {
 446                        printk(KERN_DEBUG "%s: dropped frame to unauthorized "
 447                               "port (IEEE 802.1X): ethertype=0x%04x\n",
 448                               dev->name, meta->ethertype);
 449                        hostap_dump_tx_80211(dev->name, skb);
 450
 451                        ret = NETDEV_TX_OK; /* drop packet */
 452                        iface->stats.tx_dropped++;
 453                        goto fail;
 454                }
 455                break;
 456        case AP_TX_DROP:
 457                ret = NETDEV_TX_OK; /* drop packet */
 458                iface->stats.tx_dropped++;
 459                goto fail;
 460        case AP_TX_RETRY:
 461                goto fail;
 462        case AP_TX_BUFFERED:
 463                /* do not free skb here, it will be freed when the
 464                 * buffered frame is sent/timed out */
 465                ret = NETDEV_TX_OK;
 466                goto tx_exit;
 467        }
 468
 469        /* Request TX callback if protocol version is 2 in 802.11 header;
 470         * this version 2 is a special case used between hostapd and kernel
 471         * driver */
 472        if (((fc & IEEE80211_FCTL_VERS) == BIT(1)) &&
 473            local->ap && local->ap->tx_callback_idx && meta->tx_cb_idx == 0) {
 474                meta->tx_cb_idx = local->ap->tx_callback_idx;
 475
 476                /* remove special version from the frame header */
 477                fc &= ~IEEE80211_FCTL_VERS;
 478                hdr->frame_control = cpu_to_le16(fc);
 479        }
 480
 481        if (!ieee80211_is_data(hdr->frame_control)) {
 482                no_encrypt = 1;
 483                tx.crypt = NULL;
 484        }
 485
 486        if (local->ieee_802_1x && meta->ethertype == ETH_P_PAE && tx.crypt &&
 487            !(fc & IEEE80211_FCTL_PROTECTED)) {
 488                no_encrypt = 1;
 489                PDEBUG(DEBUG_EXTRA2, "%s: TX: IEEE 802.1X - passing "
 490                       "unencrypted EAPOL frame\n", dev->name);
 491                tx.crypt = NULL; /* no encryption for IEEE 802.1X frames */
 492        }
 493
 494        if (tx.crypt && (!tx.crypt->ops || !tx.crypt->ops->encrypt_mpdu))
 495                tx.crypt = NULL;
 496        else if ((tx.crypt ||
 497                 local->crypt_info.crypt[local->crypt_info.tx_keyidx]) &&
 498                 !no_encrypt) {
 499                /* Add ISWEP flag both for firmware and host based encryption
 500                 */
 501                fc |= IEEE80211_FCTL_PROTECTED;
 502                hdr->frame_control = cpu_to_le16(fc);
 503        } else if (local->drop_unencrypted &&
 504                   ieee80211_is_data(hdr->frame_control) &&
 505                   meta->ethertype != ETH_P_PAE) {
 506                if (net_ratelimit()) {
 507                        printk(KERN_DEBUG "%s: dropped unencrypted TX data "
 508                               "frame (drop_unencrypted=1)\n", dev->name);
 509                }
 510                iface->stats.tx_dropped++;
 511                ret = NETDEV_TX_OK;
 512                goto fail;
 513        }
 514
 515        if (tx.crypt) {
 516                skb = hostap_tx_encrypt(skb, tx.crypt);
 517                if (skb == NULL) {
 518                        printk(KERN_DEBUG "%s: TX - encryption failed\n",
 519                               dev->name);
 520                        ret = NETDEV_TX_OK;
 521                        goto fail;
 522                }
 523                meta = (struct hostap_skb_tx_data *) skb->cb;
 524                if (meta->magic != HOSTAP_SKB_TX_DATA_MAGIC) {
 525                        printk(KERN_DEBUG "%s: invalid skb->cb magic (0x%08x, "
 526                               "expected 0x%08x) after hostap_tx_encrypt\n",
 527                               dev->name, meta->magic,
 528                               HOSTAP_SKB_TX_DATA_MAGIC);
 529                        ret = NETDEV_TX_OK;
 530                        iface->stats.tx_dropped++;
 531                        goto fail;
 532                }
 533        }
 534
 535        if (local->func->tx == NULL || local->func->tx(skb, dev)) {
 536                ret = NETDEV_TX_OK;
 537                iface->stats.tx_dropped++;
 538        } else {
 539                ret = NETDEV_TX_OK;
 540                iface->stats.tx_packets++;
 541                iface->stats.tx_bytes += skb->len;
 542        }
 543
 544 fail:
 545        if (ret == NETDEV_TX_OK && skb)
 546                dev_kfree_skb(skb);
 547 tx_exit:
 548        if (tx.sta_ptr)
 549                hostap_handle_sta_release(tx.sta_ptr);
 550        return ret;
 551}
 552
 553
 554EXPORT_SYMBOL(hostap_master_start_xmit);
 555