drivers/staging/wlan-ng/p80211netdev.c

   1 /* src/p80211/p80211knetdev.c
   2 *
   3 * Linux Kernel net device interface
   4 *
   5 * Copyright (C) 1999 AbsoluteValue Systems, Inc.  All Rights Reserved.
   6 * --------------------------------------------------------------------
   7 *
   8 * linux-wlan
   9 *
  10 *   The contents of this file are subject to the Mozilla Public
  11 *   License Version 1.1 (the "License"); you may not use this file
  12 *   except in compliance with the License. You may obtain a copy of
  13 *   the License at http://www.mozilla.org/MPL/
  14 *
  15 *   Software distributed under the License is distributed on an "AS
  16 *   IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
  17 *   implied. See the License for the specific language governing
  18 *   rights and limitations under the License.
  19 *
  20 *   Alternatively, the contents of this file may be used under the
  21 *   terms of the GNU Public License version 2 (the "GPL"), in which
  22 *   case the provisions of the GPL are applicable instead of the
  23 *   above.  If you wish to allow the use of your version of this file
  24 *   only under the terms of the GPL and not to allow others to use
  25 *   your version of this file under the MPL, indicate your decision
  26 *   by deleting the provisions above and replace them with the notice
  27 *   and other provisions required by the GPL.  If you do not delete
  28 *   the provisions above, a recipient may use your version of this
  29 *   file under either the MPL or the GPL.
  30 *
  31 * --------------------------------------------------------------------
  32 *
  33 * Inquiries regarding the linux-wlan Open Source project can be
  34 * made directly to:
  35 *
  36 * AbsoluteValue Systems Inc.
  37 * [email protected]
  38 * http://www.linux-wlan.com
  39 *
  40 * --------------------------------------------------------------------
  41 *
  42 * Portions of the development of this software were funded by
  43 * Intersil Corporation as part of PRISM(R) chipset product development.
  44 *
  45 * --------------------------------------------------------------------
  46 *
  47 * The functions required for a Linux network device are defined here.
  48 *
  49 * --------------------------------------------------------------------
  50 */
  51
  52 #include <linux/module.h>
  53 #include <linux/kernel.h>
  54 #include <linux/sched.h>
  55 #include <linux/types.h>
  56 #include <linux/skbuff.h>
  57 #include <linux/slab.h>
  58 #include <linux/proc_fs.h>
  59 #include <linux/interrupt.h>
  60 #include <linux/netdevice.h>
  61 #include <linux/kmod.h>
  62 #include <linux/if_arp.h>
  63 #include <linux/wireless.h>
  64 #include <linux/sockios.h>
  65 #include <linux/etherdevice.h>
  66 #include <linux/if_ether.h>
  67 #include <linux/byteorder/generic.h>
  68 #include <linux/bitops.h>
  69 #include <linux/uaccess.h>
  70 #include <asm/byteorder.h>
  71
  72 #ifdef SIOCETHTOOL
  73 #include <linux/ethtool.h>
  74 #endif
  75
  76 #include <net/iw_handler.h>
  77 #include <net/net_namespace.h>
  78 #include <net/cfg80211.h>
  79
  80 #include "p80211types.h"
  81 #include "p80211hdr.h"
  82 #include "p80211conv.h"
  83 #include "p80211mgmt.h"
  84 #include "p80211msg.h"
  85 #include "p80211netdev.h"
  86 #include "p80211ioctl.h"
  87 #include "p80211req.h"
  88 #include "p80211metastruct.h"
  89 #include "p80211metadef.h"
  90
  91 #include "cfg80211.c"
  92
  93 /* netdevice method functions */
  94 static int p80211knetdev_init(netdevice_t *netdev);
  95 static struct net_device_stats *p80211knetdev_get_stats(netdevice_t *netdev);
  96 static int p80211knetdev_open(netdevice_t *netdev);
  97 static int p80211knetdev_stop(netdevice_t *netdev);
  98 static int p80211knetdev_hard_start_xmit(struct sk_buff *skb,
  99                                          netdevice_t *netdev);
 100 static void p80211knetdev_set_multicast_list(netdevice_t *dev);
 101 static int p80211knetdev_do_ioctl(netdevice_t *dev, struct ifreq *ifr,
 102                                   int cmd);
 103 static int p80211knetdev_set_mac_address(netdevice_t *dev, void *addr);
 104 static void p80211knetdev_tx_timeout(netdevice_t *netdev);
 105 static int p80211_rx_typedrop(wlandevice_t *wlandev, u16 fc);
 106
 107 int wlan_watchdog = 5000;
 108 module_param(wlan_watchdog, int, 0644);
 109 MODULE_PARM_DESC(wlan_watchdog, "transmit timeout in milliseconds");
 110
 111 int wlan_wext_write = 1;
 112 module_param(wlan_wext_write, int, 0644);
 113 MODULE_PARM_DESC(wlan_wext_write, "enable write wireless extensions");
 114
 115 /*----------------------------------------------------------------
 116 * p80211knetdev_init
 117 *
 118 * Init method for a Linux netdevice.  Called in response to
 119 * register_netdev.
 120 *
 121 * Arguments:
 122 *       none
 123 *
 124 * Returns:
 125 *       nothing
 126 ----------------------------------------------------------------*/
 127 static int p80211knetdev_init(netdevice_t *netdev)
 128 {
 129         /* Called in response to register_netdev */
 130         /* This is usually the probe function, but the probe has */
 131         /* already been done by the MSD and the create_kdev */
 132         /* function.  All we do here is return success */
 133         return 0;
 134 }
 135
 136 /*----------------------------------------------------------------
 137 * p80211knetdev_get_stats
 138 *
 139 * Statistics retrieval for linux netdevices.  Here we're reporting
 140 * the Linux i/f level statistics.  Hence, for the primary numbers,
 141 * we don't want to report the numbers from the MIB.  Eventually,
 142 * it might be useful to collect some of the error counters though.
 143 *
 144 * Arguments:
 145 *       netdev          Linux netdevice
 146 *
 147 * Returns:
 148 *       the address of the statistics structure
 149 ----------------------------------------------------------------*/
 150 static struct net_device_stats *p80211knetdev_get_stats(netdevice_t *netdev)
 151 {
 152         wlandevice_t *wlandev = netdev->ml_priv;
 153
 154         /* TODO: review the MIB stats for items that correspond to
 155            linux stats */
 156
 157         return &(wlandev->linux_stats);
 158 }
 159
 160 /*----------------------------------------------------------------
 161 * p80211knetdev_open
 162 *
 163 * Linux netdevice open method.  Following a successful call here,
 164 * the device is supposed to be ready for tx and rx.  In our
 165 * situation that may not be entirely true due to the state of the
 166 * MAC below.
 167 *
 168 * Arguments:
 169 *       netdev          Linux network device structure
 170 *
 171 * Returns:
 172 *       zero on success, non-zero otherwise
 173 ----------------------------------------------------------------*/
 174 static int p80211knetdev_open(netdevice_t *netdev)
 175 {
 176         int result = 0;         /* success */
 177         wlandevice_t *wlandev = netdev->ml_priv;
 178
 179         /* Check to make sure the MSD is running */
 180         if (wlandev->msdstate != WLAN_MSD_RUNNING)
 181                 return -ENODEV;
 182
 183         /* Tell the MSD to open */
 184         if (wlandev->open != NULL) {
 185                 result = wlandev->open(wlandev);
 186                 if (result == 0) {
 187                         netif_start_queue(wlandev->netdev);
 188                         wlandev->state = WLAN_DEVICE_OPEN;
 189                 }
 190         } else {
 191                 result = -EAGAIN;
 192         }
 193
 194         return result;
 195 }
 196
 197 /*----------------------------------------------------------------
 198 * p80211knetdev_stop
 199 *
 200 * Linux netdevice stop (close) method.  Following this call,
 201 * no frames should go up or down through this interface.
 202 *
 203 * Arguments:
 204 *       netdev          Linux network device structure
 205 *
 206 * Returns:
 207 *       zero on success, non-zero otherwise
 208 ----------------------------------------------------------------*/
 209 static int p80211knetdev_stop(netdevice_t *netdev)
 210 {
 211         int result = 0;
 212         wlandevice_t *wlandev = netdev->ml_priv;
 213
 214         if (wlandev->close != NULL)
 215                 result = wlandev->close(wlandev);
 216
 217         netif_stop_queue(wlandev->netdev);
 218         wlandev->state = WLAN_DEVICE_CLOSED;
 219
 220         return result;
 221 }
 222
 223 /*----------------------------------------------------------------
 224 * p80211netdev_rx
 225 *
 226 * Frame receive function called by the mac specific driver.
 227 *
 228 * Arguments:
 229 *       wlandev         WLAN network device structure
 230 *       skb             skbuff containing a full 802.11 frame.
 231 * Returns:
 232 *       nothing
 233 * Side effects:
 234 *
 235 ----------------------------------------------------------------*/
 236 void p80211netdev_rx(wlandevice_t *wlandev, struct sk_buff *skb)
 237 {
 238         /* Enqueue for post-irq processing */
 239         skb_queue_tail(&wlandev->nsd_rxq, skb);
 240         tasklet_schedule(&wlandev->rx_bh);
 241 }
 242
 243 #define CONV_TO_ETHER_SKIPPED   0x01
 244 #define CONV_TO_ETHER_FAILED    0x02
 245
 246 /**
 247  * p80211_convert_to_ether - conversion from 802.11 frame to ethernet frame
 248  * @wlandev: pointer to WLAN device
 249  * @skb: pointer to socket buffer
 250  *
 251  * Returns: 0 if conversion succeeded
 252  *          CONV_TO_ETHER_FAILED if conversion failed
 253  *          CONV_TO_ETHER_SKIPPED if frame is ignored
 254  */
 255 static int p80211_convert_to_ether(wlandevice_t *wlandev, struct sk_buff *skb)
 256 {
 257         struct p80211_hdr_a3 *hdr;
 258
 259         hdr = (struct p80211_hdr_a3 *) skb->data;
 260         if (p80211_rx_typedrop(wlandev, hdr->fc))
 261                 return CONV_TO_ETHER_SKIPPED;
 262
 263         /* perform mcast filtering: allow my local address through but reject
 264          * anything else that isn't multicast
 265          */
 266         if (wlandev->netdev->flags & IFF_ALLMULTI) {
 267                 if (!ether_addr_equal_unaligned(wlandev->netdev->dev_addr,
 268                                                 hdr->a1)) {
 269                         if (!is_multicast_ether_addr(hdr->a1))
 270                                 return CONV_TO_ETHER_SKIPPED;
 271                 }
 272         }
 273
 274         if (skb_p80211_to_ether(wlandev, wlandev->ethconv, skb) == 0) {
 275                 skb->dev->last_rx = jiffies;
 276                 wlandev->linux_stats.rx_packets++;
 277                 wlandev->linux_stats.rx_bytes += skb->len;
 278                 netif_rx_ni(skb);
 279                 return 0;
 280         }
 281
 282         netdev_dbg(wlandev->netdev, "p80211_convert_to_ether failed.\n");
 283         return CONV_TO_ETHER_FAILED;
 284 }
 285
 286 /**
 287  * p80211netdev_rx_bh - deferred processing of all received frames
 288  *
 289  * @arg: pointer to WLAN network device structure (cast to unsigned long)
 290  */
 291 static void p80211netdev_rx_bh(unsigned long arg)
 292 {
 293         wlandevice_t *wlandev = (wlandevice_t *) arg;
 294         struct sk_buff *skb = NULL;
 295         netdevice_t *dev = wlandev->netdev;
 296
 297         /* Let's empty our our queue */
 298         while ((skb = skb_dequeue(&wlandev->nsd_rxq))) {
 299                 if (wlandev->state == WLAN_DEVICE_OPEN) {
 300
 301                         if (dev->type != ARPHRD_ETHER) {
 302                                 /* RAW frame; we shouldn't convert it */
 303                                 /* XXX Append the Prism Header here instead. */
 304
 305                                 /* set up various data fields */
 306                                 skb->dev = dev;
 307                                 skb_reset_mac_header(skb);
 308                                 skb->ip_summed = CHECKSUM_NONE;
 309                                 skb->pkt_type = PACKET_OTHERHOST;
 310                                 skb->protocol = htons(ETH_P_80211_RAW);
 311                                 dev->last_rx = jiffies;
 312
 313                                 wlandev->linux_stats.rx_packets++;
 314                                 wlandev->linux_stats.rx_bytes += skb->len;
 315                                 netif_rx_ni(skb);
 316                                 continue;
 317                         } else {
 318                                 if (!p80211_convert_to_ether(wlandev, skb))
 319                                         continue;
 320                         }
 321                 }
 322                 dev_kfree_skb(skb);
 323         }
 324 }
 325
 326 /*----------------------------------------------------------------
 327 * p80211knetdev_hard_start_xmit
 328 *
 329 * Linux netdevice method for transmitting a frame.
 330 *
 331 * Arguments:
 332 *       skb     Linux sk_buff containing the frame.
 333 *       netdev  Linux netdevice.
 334 *
 335 * Side effects:
 336 *       If the lower layers report that buffers are full. netdev->tbusy
 337 *       will be set to prevent higher layers from sending more traffic.
 338 *
 339 *       Note: If this function returns non-zero, higher layers retain
 340 *             ownership of the skb.
 341 *
 342 * Returns:
 343 *       zero on success, non-zero on failure.
 344 ----------------------------------------------------------------*/
 345 static int p80211knetdev_hard_start_xmit(struct sk_buff *skb,
 346                                          netdevice_t *netdev)
 347 {
 348         int result = 0;
 349         int txresult = -1;
 350         wlandevice_t *wlandev = netdev->ml_priv;
 351         union p80211_hdr p80211_hdr;
 352         struct p80211_metawep p80211_wep;
 353
 354         p80211_wep.data = NULL;
 355
 356         if (skb == NULL)
 357                 return NETDEV_TX_OK;
 358
 359         if (wlandev->state != WLAN_DEVICE_OPEN) {
 360                 result = 1;
 361                 goto failed;
 362         }
 363
 364         memset(&p80211_hdr, 0, sizeof(union p80211_hdr));
 365         memset(&p80211_wep, 0, sizeof(struct p80211_metawep));
 366
 367         if (netif_queue_stopped(netdev)) {
 368                 netdev_dbg(netdev, "called when queue stopped.\n");
 369                 result = 1;
 370                 goto failed;
 371         }
 372
 373         netif_stop_queue(netdev);
 374
 375         /* Check to see that a valid mode is set */
 376         switch (wlandev->macmode) {
 377         case WLAN_MACMODE_IBSS_STA:
 378         case WLAN_MACMODE_ESS_STA:
 379         case WLAN_MACMODE_ESS_AP:
 380                 break;
 381         default:
 382                 /* Mode isn't set yet, just drop the frame
 383                  * and return success .
 384                  * TODO: we need a saner way to handle this
 385                  */
 386                 if (skb->protocol != ETH_P_80211_RAW) {
 387                         netif_start_queue(wlandev->netdev);
 388                         netdev_notice(netdev, "Tx attempt prior to association, frame dropped.\n");
 389                         wlandev->linux_stats.tx_dropped++;
 390                         result = 0;
 391                         goto failed;
 392                 }
 393                 break;
 394         }
 395
 396         /* Check for raw transmits */
 397         if (skb->protocol == ETH_P_80211_RAW) {
 398                 if (!capable(CAP_NET_ADMIN)) {
 399                         result = 1;
 400                         goto failed;
 401                 }
 402                 /* move the header over */
 403                 memcpy(&p80211_hdr, skb->data, sizeof(union p80211_hdr));
 404                 skb_pull(skb, sizeof(union p80211_hdr));
 405         } else {
 406                 if (skb_ether_to_p80211
 407                     (wlandev, wlandev->ethconv, skb, &p80211_hdr,
 408                      &p80211_wep) != 0) {
 409                         /* convert failed */
 410                         netdev_dbg(netdev, "ether_to_80211(%d) failed.\n",
 411                                    wlandev->ethconv);
 412                         result = 1;
 413                         goto failed;
 414                 }
 415         }
 416         if (wlandev->txframe == NULL) {
 417                 result = 1;
 418                 goto failed;
 419         }
 420
 421         netdev->trans_start = jiffies;
 422
 423         wlandev->linux_stats.tx_packets++;
 424         /* count only the packet payload */
 425         wlandev->linux_stats.tx_bytes += skb->len;
 426
 427         txresult = wlandev->txframe(wlandev, skb, &p80211_hdr, &p80211_wep);
 428
 429         if (txresult == 0) {
 430                 /* success and more buf */
 431                 /* avail, re: hw_txdata */
 432                 netif_wake_queue(wlandev->netdev);
 433                 result = NETDEV_TX_OK;
 434         } else if (txresult == 1) {
 435                 /* success, no more avail */
 436                 netdev_dbg(netdev, "txframe success, no more bufs\n");
 437                 /* netdev->tbusy = 1;  don't set here, irqhdlr */
 438                 /*   may have already cleared it */
 439                 result = NETDEV_TX_OK;
 440         } else if (txresult == 2) {
 441                 /* alloc failure, drop frame */
 442                 netdev_dbg(netdev, "txframe returned alloc_fail\n");
 443                 result = NETDEV_TX_BUSY;
 444         } else {
 445                 /* buffer full or queue busy, drop frame. */
 446                 netdev_dbg(netdev, "txframe returned full or busy\n");
 447                 result = NETDEV_TX_BUSY;
 448         }
 449
 450 failed:
 451         /* Free up the WEP buffer if it's not the same as the skb */
 452         if ((p80211_wep.data) && (p80211_wep.data != skb->data))
 453                 kzfree(p80211_wep.data);
 454
 455         /* we always free the skb here, never in a lower level. */
 456         if (!result)
 457                 dev_kfree_skb(skb);
 458
 459         return result;
 460 }
 461
 462 /*----------------------------------------------------------------
 463 * p80211knetdev_set_multicast_list
 464 *
 465 * Called from higher layers whenever there's a need to set/clear
 466 * promiscuous mode or rewrite the multicast list.
 467 *
 468 * Arguments:
 469 *       none
 470 *
 471 * Returns:
 472 *       nothing
 473 ----------------------------------------------------------------*/
 474 static void p80211knetdev_set_multicast_list(netdevice_t *dev)
 475 {
 476         wlandevice_t *wlandev = dev->ml_priv;
 477
 478         /* TODO:  real multicast support as well */
 479
 480         if (wlandev->set_multicast_list)
 481                 wlandev->set_multicast_list(wlandev, dev);
 482
 483 }
 484
 485 #ifdef SIOCETHTOOL
 486
 487 static int p80211netdev_ethtool(wlandevice_t *wlandev, void __user *useraddr)
 488 {
 489         u32 ethcmd;
 490         struct ethtool_drvinfo info;
 491         struct ethtool_value edata;
 492
 493         memset(&info, 0, sizeof(info));
 494         memset(&edata, 0, sizeof(edata));
 495
 496         if (copy_from_user(&ethcmd, useraddr, sizeof(ethcmd)))
 497                 return -EFAULT;
 498
 499         switch (ethcmd) {
 500         case ETHTOOL_GDRVINFO:
 501                 info.cmd = ethcmd;
 502                 snprintf(info.driver, sizeof(info.driver), "p80211_%s",
 503                          wlandev->nsdname);
 504                 snprintf(info.version, sizeof(info.version), "%s",
 505                          WLAN_RELEASE);
 506
 507                 if (copy_to_user(useraddr, &info, sizeof(info)))
 508                         return -EFAULT;
 509                 return 0;
 510 #ifdef ETHTOOL_GLINK
 511         case ETHTOOL_GLINK:
 512                 edata.cmd = ethcmd;
 513
 514                 if (wlandev->linkstatus &&
 515                     (wlandev->macmode != WLAN_MACMODE_NONE)) {
 516                         edata.data = 1;
 517                 } else {
 518                         edata.data = 0;
 519                 }
 520
 521                 if (copy_to_user(useraddr, &edata, sizeof(edata)))
 522                         return -EFAULT;
 523                 return 0;
 524 #endif
 525         }
 526
 527         return -EOPNOTSUPP;
 528 }
 529
 530 #endif
 531
 532 /*----------------------------------------------------------------
 533 * p80211knetdev_do_ioctl
 534 *
 535 * Handle an ioctl call on one of our devices.  Everything Linux
 536 * ioctl specific is done here.  Then we pass the contents of the
 537 * ifr->data to the request message handler.
 538 *
 539 * Arguments:
 540 *       dev     Linux kernel netdevice
 541 *       ifr     Our private ioctl request structure, typed for the
 542 *               generic struct ifreq so we can use ptr to func
 543 *               w/o cast.
 544 *
 545 * Returns:
 546 *       zero on success, a negative errno on failure.  Possible values:
 547 *               -ENETDOWN Device isn't up.
 548 *               -EBUSY  cmd already in progress
 549 *               -ETIME  p80211 cmd timed out (MSD may have its own timers)
 550 *               -EFAULT memory fault copying msg from user buffer
 551 *               -ENOMEM unable to allocate kernel msg buffer
 552 *               -ENOSYS bad magic, it the cmd really for us?
 553 *               -EintR  sleeping on cmd, awakened by signal, cmd cancelled.
 554 *
 555 * Call Context:
 556 *       Process thread (ioctl caller).  TODO: SMP support may require
 557 *       locks.
 558 ----------------------------------------------------------------*/
 559 static int p80211knetdev_do_ioctl(netdevice_t *dev, struct ifreq *ifr, int cmd)
 560 {
 561         int result = 0;
 562         struct p80211ioctl_req *req = (struct p80211ioctl_req *) ifr;
 563         wlandevice_t *wlandev = dev->ml_priv;
 564         u8 *msgbuf;
 565
 566         netdev_dbg(dev, "rx'd ioctl, cmd=%d, len=%d\n", cmd, req->len);
 567
 568 #ifdef SIOCETHTOOL
 569         if (cmd == SIOCETHTOOL) {
 570                 result =
 571                     p80211netdev_ethtool(wlandev, (void __user *)ifr->ifr_data);
 572                 goto bail;
 573         }
 574 #endif
 575
 576         /* Test the magic, assume ifr is good if it's there */
 577         if (req->magic != P80211_IOCTL_MAGIC) {
 578                 result = -ENOSYS;
 579                 goto bail;
 580         }
 581
 582         if (cmd == P80211_IFTEST) {
 583                 result = 0;
 584                 goto bail;
 585         } else if (cmd != P80211_IFREQ) {
 586                 result = -ENOSYS;
 587                 goto bail;
 588         }
 589
 590         /* Allocate a buf of size req->len */
 591         msgbuf = kmalloc(req->len, GFP_KERNEL);
 592         if (msgbuf) {
 593                 if (copy_from_user(msgbuf, (void __user *)req->data, req->len))
 594                         result = -EFAULT;
 595                 else
 596                         result = p80211req_dorequest(wlandev, msgbuf);
 597
 598                 if (result == 0) {
 599                         if (copy_to_user
 600                             ((void __user *)req->data, msgbuf, req->len)) {
 601                                 result = -EFAULT;
 602                         }
 603                 }
 604                 kfree(msgbuf);
 605         } else {
 606                 result = -ENOMEM;
 607         }
 608 bail:
 609         /* If allocate,copyfrom or copyto fails, return errno */
 610         return result;
 611 }
 612
 613 /*----------------------------------------------------------------
 614 * p80211knetdev_set_mac_address
 615 *
 616 * Handles the ioctl for changing the MACAddress of a netdevice
 617 *
 618 * references: linux/netdevice.h and drivers/net/net_init.c
 619 *
 620 * NOTE: [MSM] We only prevent address changes when the netdev is
 621 * up.  We don't control anything based on dot11 state.  If the
 622 * address is changed on a STA that's currently associated, you
 623 * will probably lose the ability to send and receive data frames.
 624 * Just be aware.  Therefore, this should usually only be done
 625 * prior to scan/join/auth/assoc.
 626 *
 627 * Arguments:
 628 *       dev     netdevice struct
 629 *       addr    the new MACAddress (a struct)
 630 *
 631 * Returns:
 632 *       zero on success, a negative errno on failure.  Possible values:
 633 *               -EBUSY  device is bussy (cmd not possible)
 634 *               -and errors returned by: p80211req_dorequest(..)
 635 *
 636 * by: Collin R. Mulliner <[email protected]>
 637 ----------------------------------------------------------------*/
 638 static int p80211knetdev_set_mac_address(netdevice_t *dev, void *addr)
 639 {
 640         struct sockaddr *new_addr = addr;
 641         struct p80211msg_dot11req_mibset dot11req;
 642         p80211item_unk392_t *mibattr;
 643         p80211item_pstr6_t *macaddr;
 644         p80211item_uint32_t *resultcode;
 645         int result;
 646
 647         /* If we're running, we don't allow MAC address changes */
 648         if (netif_running(dev))
 649                 return -EBUSY;
 650
 651         /* Set up some convenience pointers. */
 652         mibattr = &dot11req.mibattribute;
 653         macaddr = (p80211item_pstr6_t *) &mibattr->data;
 654         resultcode = &dot11req.resultcode;
 655
 656         /* Set up a dot11req_mibset */
 657         memset(&dot11req, 0, sizeof(struct p80211msg_dot11req_mibset));
 658         dot11req.msgcode = DIDmsg_dot11req_mibset;
 659         dot11req.msglen = sizeof(struct p80211msg_dot11req_mibset);
 660         memcpy(dot11req.devname,
 661                ((wlandevice_t *) dev->ml_priv)->name, WLAN_DEVNAMELEN_MAX - 1);
 662
 663         /* Set up the mibattribute argument */
 664         mibattr->did = DIDmsg_dot11req_mibset_mibattribute;
 665         mibattr->status = P80211ENUM_msgitem_status_data_ok;
 666         mibattr->len = sizeof(mibattr->data);
 667
 668         macaddr->did = DIDmib_dot11mac_dot11OperationTable_dot11MACAddress;
 669         macaddr->status = P80211ENUM_msgitem_status_data_ok;
 670         macaddr->len = sizeof(macaddr->data);
 671         macaddr->data.len = ETH_ALEN;
 672         memcpy(&macaddr->data.data, new_addr->sa_data, ETH_ALEN);
 673
 674         /* Set up the resultcode argument */
 675         resultcode->did = DIDmsg_dot11req_mibset_resultcode;
 676         resultcode->status = P80211ENUM_msgitem_status_no_value;
 677         resultcode->len = sizeof(resultcode->data);
 678         resultcode->data = 0;
 679
 680         /* now fire the request */
 681         result = p80211req_dorequest(dev->ml_priv, (u8 *) &dot11req);
 682
 683         /* If the request wasn't successful, report an error and don't
 684          * change the netdev address
 685          */
 686         if (result != 0 || resultcode->data != P80211ENUM_resultcode_success) {
 687                 netdev_err(dev, "Low-level driver failed dot11req_mibset(dot11MACAddress).\n");
 688                 result = -EADDRNOTAVAIL;
 689         } else {
 690                 /* everything's ok, change the addr in netdev */
 691                 memcpy(dev->dev_addr, new_addr->sa_data, dev->addr_len);
 692         }
 693
 694         return result;
 695 }
 696
 697 static int wlan_change_mtu(netdevice_t *dev, int new_mtu)
 698 {
 699         /* 2312 is max 802.11 payload, 20 is overhead, (ether + llc +snap)
 700            and another 8 for wep. */
 701         if ((new_mtu < 68) || (new_mtu > (2312 - 20 - 8)))
 702                 return -EINVAL;
 703
 704         dev->mtu = new_mtu;
 705
 706         return 0;
 707 }
 708
 709 static const struct net_device_ops p80211_netdev_ops = {
 710         .ndo_init = p80211knetdev_init,
 711         .ndo_open = p80211knetdev_open,
 712         .ndo_stop = p80211knetdev_stop,
 713         .ndo_get_stats = p80211knetdev_get_stats,
 714         .ndo_start_xmit = p80211knetdev_hard_start_xmit,
 715         .ndo_set_rx_mode = p80211knetdev_set_multicast_list,
 716         .ndo_do_ioctl = p80211knetdev_do_ioctl,
 717         .ndo_set_mac_address = p80211knetdev_set_mac_address,
 718         .ndo_tx_timeout = p80211knetdev_tx_timeout,
 719         .ndo_change_mtu = wlan_change_mtu,
 720         .ndo_validate_addr = eth_validate_addr,
 721 };
 722
 723 /*----------------------------------------------------------------
 724 * wlan_setup
 725 *
 726 * Roughly matches the functionality of ether_setup.  Here
 727 * we set up any members of the wlandevice structure that are common
 728 * to all devices.  Additionally, we allocate a linux 'struct device'
 729 * and perform the same setup as ether_setup.
 730 *
 731 * Note: It's important that the caller have setup the wlandev->name
 732 *       ptr prior to calling this function.
 733 *
 734 * Arguments:
 735 *       wlandev         ptr to the wlandev structure for the
 736 *                       interface.
 737 *       physdev         ptr to usb device
 738 * Returns:
 739 *       zero on success, non-zero otherwise.
 740 * Call Context:
 741 *       Should be process thread.  We'll assume it might be
 742 *       interrupt though.  When we add support for statically
 743 *       compiled drivers, this function will be called in the
 744 *       context of the kernel startup code.
 745 ----------------------------------------------------------------*/
 746 int wlan_setup(wlandevice_t *wlandev, struct device *physdev)
 747 {
 748         int result = 0;
 749         netdevice_t *netdev;
 750         struct wiphy *wiphy;
 751         struct wireless_dev *wdev;
 752
 753         /* Set up the wlandev */
 754         wlandev->state = WLAN_DEVICE_CLOSED;
 755         wlandev->ethconv = WLAN_ETHCONV_8021h;
 756         wlandev->macmode = WLAN_MACMODE_NONE;
 757
 758         /* Set up the rx queue */
 759         skb_queue_head_init(&wlandev->nsd_rxq);
 760         tasklet_init(&wlandev->rx_bh,
 761                      p80211netdev_rx_bh, (unsigned long)wlandev);
 762
 763         /* Allocate and initialize the wiphy struct */
 764         wiphy = wlan_create_wiphy(physdev, wlandev);
 765         if (wiphy == NULL) {
 766                 dev_err(physdev, "Failed to alloc wiphy.\n");
 767                 return 1;
 768         }
 769
 770         /* Allocate and initialize the struct device */
 771         netdev = alloc_netdev(sizeof(struct wireless_dev), "wlan%d",
 772                                 ether_setup);
 773         if (netdev == NULL) {
 774                 dev_err(physdev, "Failed to alloc netdev.\n");
 775                 wlan_free_wiphy(wiphy);
 776                 result = 1;
 777         } else {
 778                 wlandev->netdev = netdev;
 779                 netdev->ml_priv = wlandev;
 780                 netdev->netdev_ops = &p80211_netdev_ops;
 781                 wdev = netdev_priv(netdev);
 782                 wdev->wiphy = wiphy;
 783                 wdev->iftype = NL80211_IFTYPE_STATION;
 784                 netdev->ieee80211_ptr = wdev;
 785
 786                 netif_stop_queue(netdev);
 787                 netif_carrier_off(netdev);
 788         }
 789
 790         return result;
 791 }
 792
 793 /*----------------------------------------------------------------
 794 * wlan_unsetup
 795 *
 796 * This function is paired with the wlan_setup routine.  It should
 797 * be called after unregister_wlandev.  Basically, all it does is
 798 * free the 'struct device' that's associated with the wlandev.
 799 * We do it here because the 'struct device' isn't allocated
 800 * explicitly in the driver code, it's done in wlan_setup.  To
 801 * do the free in the driver might seem like 'magic'.
 802 *
 803 * Arguments:
 804 *       wlandev         ptr to the wlandev structure for the
 805 *                       interface.
 806 * Call Context:
 807 *       Should be process thread.  We'll assume it might be
 808 *       interrupt though.  When we add support for statically
 809 *       compiled drivers, this function will be called in the
 810 *       context of the kernel startup code.
 811 ----------------------------------------------------------------*/
 812 void wlan_unsetup(wlandevice_t *wlandev)
 813 {
 814         struct wireless_dev *wdev;
 815
 816         tasklet_kill(&wlandev->rx_bh);
 817
 818         if (wlandev->netdev) {
 819                 wdev = netdev_priv(wlandev->netdev);
 820                 if (wdev->wiphy)
 821                         wlan_free_wiphy(wdev->wiphy);
 822                 free_netdev(wlandev->netdev);
 823                 wlandev->netdev = NULL;
 824         }
 825 }
 826
 827 /*----------------------------------------------------------------
 828 * register_wlandev
 829 *
 830 * Roughly matches the functionality of register_netdev.  This function
 831 * is called after the driver has successfully probed and set up the
 832 * resources for the device.  It's now ready to become a named device
 833 * in the Linux system.
 834 *
 835 * First we allocate a name for the device (if not already set), then
 836 * we call the Linux function register_netdevice.
 837 *
 838 * Arguments:
 839 *       wlandev         ptr to the wlandev structure for the
 840 *                       interface.
 841 * Returns:
 842 *       zero on success, non-zero otherwise.
 843 * Call Context:
 844 *       Can be either interrupt or not.
 845 ----------------------------------------------------------------*/
 846 int register_wlandev(wlandevice_t *wlandev)
 847 {
 848         return register_netdev(wlandev->netdev);
 849 }
 850
 851 /*----------------------------------------------------------------
 852 * unregister_wlandev
 853 *
 854 * Roughly matches the functionality of unregister_netdev.  This
 855 * function is called to remove a named device from the system.
 856 *
 857 * First we tell linux that the device should no longer exist.
 858 * Then we remove it from the list of known wlan devices.
 859 *
 860 * Arguments:
 861 *       wlandev         ptr to the wlandev structure for the
 862 *                       interface.
 863 * Returns:
 864 *       zero on success, non-zero otherwise.
 865 * Call Context:
 866 *       Can be either interrupt or not.
 867 ----------------------------------------------------------------*/
 868 int unregister_wlandev(wlandevice_t *wlandev)
 869 {
 870         struct sk_buff *skb;
 871
 872         unregister_netdev(wlandev->netdev);
 873
 874         /* Now to clean out the rx queue */
 875         while ((skb = skb_dequeue(&wlandev->nsd_rxq)))
 876                 dev_kfree_skb(skb);
 877
 878         return 0;
 879 }
 880
 881 /*----------------------------------------------------------------
 882 * p80211netdev_hwremoved
 883 *
 884 * Hardware removed notification. This function should be called
 885 * immediately after an MSD has detected that the underlying hardware
 886 * has been yanked out from under us.  The primary things we need
 887 * to do are:
 888 *   - Mark the wlandev
 889 *   - Prevent any further traffic from the knetdev i/f
 890 *   - Prevent any further requests from mgmt i/f
 891 *   - If there are any waitq'd mgmt requests or mgmt-frame exchanges,
 892 *     shut them down.
 893 *   - Call the MSD hwremoved function.
 894 *
 895 * The remainder of the cleanup will be handled by unregister().
 896 * Our primary goal here is to prevent as much tickling of the MSD
 897 * as possible since the MSD is already in a 'wounded' state.
 898 *
 899 * TODO: As new features are added, this function should be
 900 *       updated.
 901 *
 902 * Arguments:
 903 *       wlandev         WLAN network device structure
 904 * Returns:
 905 *       nothing
 906 * Side effects:
 907 *
 908 * Call context:
 909 *       Usually interrupt.
 910 ----------------------------------------------------------------*/
 911 void p80211netdev_hwremoved(wlandevice_t *wlandev)
 912 {
 913         wlandev->hwremoved = 1;
 914         if (wlandev->state == WLAN_DEVICE_OPEN)
 915                 netif_stop_queue(wlandev->netdev);
 916
 917         netif_device_detach(wlandev->netdev);
 918 }
 919
 920 /*----------------------------------------------------------------
 921 * p80211_rx_typedrop
 922 *
 923 * Classifies the frame, increments the appropriate counter, and
 924 * returns 0|1|2 indicating whether the driver should handle, ignore, or
 925 * drop the frame
 926 *
 927 * Arguments:
 928 *       wlandev         wlan device structure
 929 *       fc              frame control field
 930 *
 931 * Returns:
 932 *       zero if the frame should be handled by the driver,
 933 *       one if the frame should be ignored
 934 *       anything else means we drop it.
 935 *
 936 * Side effects:
 937 *
 938 * Call context:
 939 *       interrupt
 940 ----------------------------------------------------------------*/
 941 static int p80211_rx_typedrop(wlandevice_t *wlandev, u16 fc)
 942 {
 943         u16 ftype;
 944         u16 fstype;
 945         int drop = 0;
 946         /* Classify frame, increment counter */
 947         ftype = WLAN_GET_FC_FTYPE(fc);
 948         fstype = WLAN_GET_FC_FSTYPE(fc);
 949 #if 0
 950         netdev_dbg(wlandev->netdev, "rx_typedrop : ftype=%d fstype=%d.\n",
 951                    ftype, fstype);
 952 #endif
 953         switch (ftype) {
 954         case WLAN_FTYPE_MGMT:
 955                 if ((wlandev->netdev->flags & IFF_PROMISC) ||
 956                     (wlandev->netdev->flags & IFF_ALLMULTI)) {
 957                         drop = 1;
 958                         break;
 959                 }
 960                 netdev_dbg(wlandev->netdev, "rx'd mgmt:\n");
 961                 wlandev->rx.mgmt++;
 962                 switch (fstype) {
 963                 case WLAN_FSTYPE_ASSOCREQ:
 964                         /* printk("assocreq"); */
 965                         wlandev->rx.assocreq++;
 966                         break;
 967                 case WLAN_FSTYPE_ASSOCRESP:
 968                         /* printk("assocresp"); */
 969                         wlandev->rx.assocresp++;
 970                         break;
 971                 case WLAN_FSTYPE_REASSOCREQ:
 972                         /* printk("reassocreq"); */
 973                         wlandev->rx.reassocreq++;
 974                         break;
 975                 case WLAN_FSTYPE_REASSOCRESP:
 976                         /* printk("reassocresp"); */
 977                         wlandev->rx.reassocresp++;
 978                         break;
 979                 case WLAN_FSTYPE_PROBEREQ:
 980                         /* printk("probereq"); */
 981                         wlandev->rx.probereq++;
 982                         break;
 983                 case WLAN_FSTYPE_PROBERESP:
 984                         /* printk("proberesp"); */
 985                         wlandev->rx.proberesp++;
 986                         break;
 987                 case WLAN_FSTYPE_BEACON:
 988                         /* printk("beacon"); */
 989                         wlandev->rx.beacon++;
 990                         break;
 991                 case WLAN_FSTYPE_ATIM:
 992                         /* printk("atim"); */
 993                         wlandev->rx.atim++;
 994                         break;
 995                 case WLAN_FSTYPE_DISASSOC:
 996                         /* printk("disassoc"); */
 997                         wlandev->rx.disassoc++;
 998                         break;
 999                 case WLAN_FSTYPE_AUTHEN:
1000                         /* printk("authen"); */
1001                         wlandev->rx.authen++;
1002                         break;
1003                 case WLAN_FSTYPE_DEAUTHEN:
1004                         /* printk("deauthen"); */
1005                         wlandev->rx.deauthen++;
1006                         break;
1007                 default:
1008                         /* printk("unknown"); */
1009                         wlandev->rx.mgmt_unknown++;
1010                         break;
1011                 }
1012                 /* printk("\n"); */
1013                 drop = 2;
1014                 break;
1015
1016         case WLAN_FTYPE_CTL:
1017                 if ((wlandev->netdev->flags & IFF_PROMISC) ||
1018                     (wlandev->netdev->flags & IFF_ALLMULTI)) {
1019                         drop = 1;
1020                         break;
1021                 }
1022                 netdev_dbg(wlandev->netdev, "rx'd ctl:\n");
1023                 wlandev->rx.ctl++;
1024                 switch (fstype) {
1025                 case WLAN_FSTYPE_PSPOLL:
1026                         /* printk("pspoll"); */
1027                         wlandev->rx.pspoll++;
1028                         break;
1029                 case WLAN_FSTYPE_RTS:
1030                         /* printk("rts"); */
1031                         wlandev->rx.rts++;
1032                         break;
1033                 case WLAN_FSTYPE_CTS:
1034                         /* printk("cts"); */
1035                         wlandev->rx.cts++;
1036                         break;
1037                 case WLAN_FSTYPE_ACK:
1038                         /* printk("ack"); */
1039                         wlandev->rx.ack++;
1040                         break;
1041                 case WLAN_FSTYPE_CFEND:
1042                         /* printk("cfend"); */
1043                         wlandev->rx.cfend++;
1044                         break;
1045                 case WLAN_FSTYPE_CFENDCFACK:
1046                         /* printk("cfendcfack"); */
1047                         wlandev->rx.cfendcfack++;
1048                         break;
1049                 default:
1050                         /* printk("unknown"); */
1051                         wlandev->rx.ctl_unknown++;
1052                         break;
1053                 }
1054                 /* printk("\n"); */
1055                 drop = 2;
1056                 break;
1057
1058         case WLAN_FTYPE_DATA:
1059                 wlandev->rx.data++;
1060                 switch (fstype) {
1061                 case WLAN_FSTYPE_DATAONLY:
1062                         wlandev->rx.dataonly++;
1063                         break;
1064                 case WLAN_FSTYPE_DATA_CFACK:
1065                         wlandev->rx.data_cfack++;
1066                         break;
1067                 case WLAN_FSTYPE_DATA_CFPOLL:
1068                         wlandev->rx.data_cfpoll++;
1069                         break;
1070                 case WLAN_FSTYPE_DATA_CFACK_CFPOLL:
1071                         wlandev->rx.data__cfack_cfpoll++;
1072                         break;
1073                 case WLAN_FSTYPE_NULL:
1074                         netdev_dbg(wlandev->netdev, "rx'd data:null\n");
1075                         wlandev->rx.null++;
1076                         break;
1077                 case WLAN_FSTYPE_CFACK:
1078                         netdev_dbg(wlandev->netdev, "rx'd data:cfack\n");
1079                         wlandev->rx.cfack++;
1080                         break;
1081                 case WLAN_FSTYPE_CFPOLL:
1082                         netdev_dbg(wlandev->netdev, "rx'd data:cfpoll\n");
1083                         wlandev->rx.cfpoll++;
1084                         break;
1085                 case WLAN_FSTYPE_CFACK_CFPOLL:
1086                         netdev_dbg(wlandev->netdev, "rx'd data:cfack_cfpoll\n");
1087                         wlandev->rx.cfack_cfpoll++;
1088                         break;
1089                 default:
1090                         /* printk("unknown"); */
1091                         wlandev->rx.data_unknown++;
1092                         break;
1093                 }
1094
1095                 break;
1096         }
1097         return drop;
1098 }
1099
1100 static void p80211knetdev_tx_timeout(netdevice_t *netdev)
1101 {
1102         wlandevice_t *wlandev = netdev->ml_priv;
1103
1104         if (wlandev->tx_timeout) {
1105                 wlandev->tx_timeout(wlandev);
1106         } else {
1107                 netdev_warn(netdev, "Implement tx_timeout for %s\n",
1108                             wlandev->nsdname);
1109                 netif_wake_queue(wlandev->netdev);
1110         }
1111 }