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 * info@linux-wlan.com
  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
  79 /*================================================================*/
  80 /* Project Includes */
  81
  82 #include "p80211types.h"
  83 #include "p80211hdr.h"
  84 #include "p80211conv.h"
  85 #include "p80211mgmt.h"
  86 #include "p80211msg.h"
  87 #include "p80211netdev.h"
  88 #include "p80211ioctl.h"
  89 #include "p80211req.h"
  90 #include "p80211metastruct.h"
  91 #include "p80211metadef.h"
  92
  93 /* Support functions */
  94 static void p80211netdev_rx_bh(unsigned long arg);
  95
  96 /* netdevice method functions */
  97 static int p80211knetdev_init(netdevice_t * netdev);
  98 static struct net_device_stats *p80211knetdev_get_stats(netdevice_t * netdev);
  99 static int p80211knetdev_open(netdevice_t * netdev);
 100 static int p80211knetdev_stop(netdevice_t * netdev);
 101 static int p80211knetdev_hard_start_xmit(struct sk_buff *skb,
 102                                          netdevice_t * netdev);
 103 static void p80211knetdev_set_multicast_list(netdevice_t * dev);
 104 static int p80211knetdev_do_ioctl(netdevice_t * dev, struct ifreq *ifr,
 105                                   int cmd);
 106 static int p80211knetdev_set_mac_address(netdevice_t * dev, void *addr);
 107 static void p80211knetdev_tx_timeout(netdevice_t * netdev);
 108 static int p80211_rx_typedrop(wlandevice_t * wlandev, u16 fc);
 109
 110 int wlan_watchdog = 5000;
 111 module_param(wlan_watchdog, int, 0644);
 112 MODULE_PARM_DESC(wlan_watchdog, "transmit timeout in milliseconds");
 113
 114 int wlan_wext_write = 1;
 115 module_param(wlan_wext_write, int, 0644);
 116 MODULE_PARM_DESC(wlan_wext_write, "enable write wireless extensions");
 117
 118 /*----------------------------------------------------------------
 119 * p80211knetdev_init
 120 *
 121 * Init method for a Linux netdevice.  Called in response to
 122 * register_netdev.
 123 *
 124 * Arguments:
 125 *       none
 126 *
 127 * Returns:
 128 *       nothing
 129 ----------------------------------------------------------------*/
 130 static int p80211knetdev_init(netdevice_t * netdev)
 131 {
 132         /* Called in response to register_netdev */
 133         /* This is usually the probe function, but the probe has */
 134         /* already been done by the MSD and the create_kdev */
 135         /* function.  All we do here is return success */
 136         return 0;
 137 }
 138
 139 /*----------------------------------------------------------------
 140 * p80211knetdev_get_stats
 141 *
 142 * Statistics retrieval for linux netdevices.  Here we're reporting
 143 * the Linux i/f level statistics.  Hence, for the primary numbers,
 144 * we don't want to report the numbers from the MIB.  Eventually,
 145 * it might be useful to collect some of the error counters though.
 146 *
 147 * Arguments:
 148 *       netdev          Linux netdevice
 149 *
 150 * Returns:
 151 *       the address of the statistics structure
 152 ----------------------------------------------------------------*/
 153 static struct net_device_stats *p80211knetdev_get_stats(netdevice_t * netdev)
 154 {
 155         wlandevice_t *wlandev = netdev->ml_priv;
 156
 157         /* TODO: review the MIB stats for items that correspond to
 158            linux stats */
 159
 160         return &(wlandev->linux_stats);
 161 }
 162
 163 /*----------------------------------------------------------------
 164 * p80211knetdev_open
 165 *
 166 * Linux netdevice open method.  Following a successful call here,
 167 * the device is supposed to be ready for tx and rx.  In our
 168 * situation that may not be entirely true due to the state of the
 169 * MAC below.
 170 *
 171 * Arguments:
 172 *       netdev          Linux network device structure
 173 *
 174 * Returns:
 175 *       zero on success, non-zero otherwise
 176 ----------------------------------------------------------------*/
 177 static int p80211knetdev_open(netdevice_t * netdev)
 178 {
 179         int result = 0;         /* success */
 180         wlandevice_t *wlandev = netdev->ml_priv;
 181
 182         /* Check to make sure the MSD is running */
 183         if (wlandev->msdstate != WLAN_MSD_RUNNING)
 184                 return -ENODEV;
 185
 186         /* Tell the MSD to open */
 187         if (wlandev->open != NULL) {
 188                 result = wlandev->open(wlandev);
 189                 if (result == 0) {
 190                         netif_start_queue(wlandev->netdev);
 191                         wlandev->state = WLAN_DEVICE_OPEN;
 192                 }
 193         } else {
 194                 result = -EAGAIN;
 195         }
 196
 197         return result;
 198 }
 199
 200 /*----------------------------------------------------------------
 201 * p80211knetdev_stop
 202 *
 203 * Linux netdevice stop (close) method.  Following this call,
 204 * no frames should go up or down through this interface.
 205 *
 206 * Arguments:
 207 *       netdev          Linux network device structure
 208 *
 209 * Returns:
 210 *       zero on success, non-zero otherwise
 211 ----------------------------------------------------------------*/
 212 static int p80211knetdev_stop(netdevice_t * netdev)
 213 {
 214         int result = 0;
 215         wlandevice_t *wlandev = netdev->ml_priv;
 216
 217         if (wlandev->close != NULL)
 218                 result = wlandev->close(wlandev);
 219
 220         netif_stop_queue(wlandev->netdev);
 221         wlandev->state = WLAN_DEVICE_CLOSED;
 222
 223         return result;
 224 }
 225
 226 /*----------------------------------------------------------------
 227 * p80211netdev_rx
 228 *
 229 * Frame receive function called by the mac specific driver.
 230 *
 231 * Arguments:
 232 *       wlandev         WLAN network device structure
 233 *       skb             skbuff containing a full 802.11 frame.
 234 * Returns:
 235 *       nothing
 236 * Side effects:
 237 *
 238 ----------------------------------------------------------------*/
 239 void p80211netdev_rx(wlandevice_t * wlandev, struct sk_buff *skb)
 240 {
 241         /* Enqueue for post-irq processing */
 242         skb_queue_tail(&wlandev->nsd_rxq, skb);
 243
 244         tasklet_schedule(&wlandev->rx_bh);
 245
 246         return;
 247 }
 248
 249 /*----------------------------------------------------------------
 250 * p80211netdev_rx_bh
 251 *
 252 * Deferred processing of all received frames.
 253 *
 254 * Arguments:
 255 *       wlandev         WLAN network device structure
 256 *       skb             skbuff containing a full 802.11 frame.
 257 * Returns:
 258 *       nothing
 259 * Side effects:
 260 *
 261 ----------------------------------------------------------------*/
 262 static void p80211netdev_rx_bh(unsigned long arg)
 263 {
 264         wlandevice_t *wlandev = (wlandevice_t *) arg;
 265         struct sk_buff *skb = NULL;
 266         netdevice_t *dev = wlandev->netdev;
 267         p80211_hdr_a3_t *hdr;
 268         u16 fc;
 269
 270         /* Let's empty our our queue */
 271         while ((skb = skb_dequeue(&wlandev->nsd_rxq))) {
 272                 if (wlandev->state == WLAN_DEVICE_OPEN) {
 273
 274                         if (dev->type != ARPHRD_ETHER) {
 275                                 /* RAW frame; we shouldn't convert it */
 276                                 /* XXX Append the Prism Header here instead. */
 277
 278                                 /* set up various data fields */
 279                                 skb->dev = dev;
 280                                 skb_reset_mac_header(skb);
 281                                 skb->ip_summed = CHECKSUM_NONE;
 282                                 skb->pkt_type = PACKET_OTHERHOST;
 283                                 skb->protocol = htons(ETH_P_80211_RAW);
 284                                 dev->last_rx = jiffies;
 285
 286                                 wlandev->linux_stats.rx_packets++;
 287                                 wlandev->linux_stats.rx_bytes += skb->len;
 288                                 netif_rx_ni(skb);
 289                                 continue;
 290                         } else {
 291                                 hdr = (p80211_hdr_a3_t *) skb->data;
 292                                 fc = le16_to_cpu(hdr->fc);
 293                                 if (p80211_rx_typedrop(wlandev, fc)) {
 294                                         dev_kfree_skb(skb);
 295                                         continue;
 296                                 }
 297
 298                                 /* perform mcast filtering */
 299                                 if (wlandev->netdev->flags & IFF_ALLMULTI) {
 300                                         /* allow my local address through */
 301                                         if (memcmp
 302                                             (hdr->a1, wlandev->netdev->dev_addr,
 303                                              ETH_ALEN) != 0) {
 304                                                 /* but reject anything else that isn't multicast */
 305                                                 if (!(hdr->a1[0] & 0x01)) {
 306                                                         dev_kfree_skb(skb);
 307                                                         continue;
 308                                                 }
 309                                         }
 310                                 }
 311
 312                                 if (skb_p80211_to_ether
 313                                     (wlandev, wlandev->ethconv, skb) == 0) {
 314                                         skb->dev->last_rx = jiffies;
 315                                         wlandev->linux_stats.rx_packets++;
 316                                         wlandev->linux_stats.rx_bytes +=
 317                                             skb->len;
 318                                         netif_rx_ni(skb);
 319                                         continue;
 320                                 }
 321                                 pr_debug("p80211_to_ether failed.\n");
 322                         }
 323                 }
 324                 dev_kfree_skb(skb);
 325         }
 326 }
 327
 328 /*----------------------------------------------------------------
 329 * p80211knetdev_hard_start_xmit
 330 *
 331 * Linux netdevice method for transmitting a frame.
 332 *
 333 * Arguments:
 334 *       skb     Linux sk_buff containing the frame.
 335 *       netdev  Linux netdevice.
 336 *
 337 * Side effects:
 338 *       If the lower layers report that buffers are full. netdev->tbusy
 339 *       will be set to prevent higher layers from sending more traffic.
 340 *
 341 *       Note: If this function returns non-zero, higher layers retain
 342 *             ownership of the skb.
 343 *
 344 * Returns:
 345 *       zero on success, non-zero on failure.
 346 ----------------------------------------------------------------*/
 347 static int p80211knetdev_hard_start_xmit(struct sk_buff *skb,
 348                                          netdevice_t * netdev)
 349 {
 350         int result = 0;
 351         int txresult = -1;
 352         wlandevice_t *wlandev = netdev->ml_priv;
 353         p80211_hdr_t p80211_hdr;
 354         p80211_metawep_t p80211_wep;
 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(p80211_hdr_t));
 365         memset(&p80211_wep, 0, sizeof(p80211_metawep_t));
 366
 367         if (netif_queue_stopped(netdev)) {
 368                 pr_debug("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                         printk(KERN_NOTICE
 389                                "Tx attempt prior to association, frame dropped.\n");
 390                         wlandev->linux_stats.tx_dropped++;
 391                         result = 0;
 392                         goto failed;
 393                 }
 394                 break;
 395         }
 396
 397         /* Check for raw transmits */
 398         if (skb->protocol == ETH_P_80211_RAW) {
 399                 if (!capable(CAP_NET_ADMIN)) {
 400                         result = 1;
 401                         goto failed;
 402                 }
 403                 /* move the header over */
 404                 memcpy(&p80211_hdr, skb->data, sizeof(p80211_hdr_t));
 405                 skb_pull(skb, sizeof(p80211_hdr_t));
 406         } else {
 407                 if (skb_ether_to_p80211
 408                     (wlandev, wlandev->ethconv, skb, &p80211_hdr,
 409                      &p80211_wep) != 0) {
 410                         /* convert failed */
 411                         pr_debug("ether_to_80211(%d) failed.\n",
 412                                  wlandev->ethconv);
 413                         result = 1;
 414                         goto failed;
 415                 }
 416         }
 417         if (wlandev->txframe == NULL) {
 418                 result = 1;
 419                 goto failed;
 420         }
 421
 422         netdev->trans_start = jiffies;
 423
 424         wlandev->linux_stats.tx_packets++;
 425         /* count only the packet payload */
 426         wlandev->linux_stats.tx_bytes += skb->len;
 427
 428         txresult = wlandev->txframe(wlandev, skb, &p80211_hdr, &p80211_wep);
 429
 430         if (txresult == 0) {
 431                 /* success and more buf */
 432                 /* avail, re: hw_txdata */
 433                 netif_wake_queue(wlandev->netdev);
 434                 result = NETDEV_TX_OK;
 435         } else if (txresult == 1) {
 436                 /* success, no more avail */
 437                 pr_debug("txframe success, no more bufs\n");
 438                 /* netdev->tbusy = 1;  don't set here, irqhdlr */
 439                 /*   may have already cleared it */
 440                 result = NETDEV_TX_OK;
 441         } else if (txresult == 2) {
 442                 /* alloc failure, drop frame */
 443                 pr_debug("txframe returned alloc_fail\n");
 444                 result = NETDEV_TX_BUSY;
 445         } else {
 446                 /* buffer full or queue busy, drop frame. */
 447                 pr_debug("txframe returned full or busy\n");
 448                 result = NETDEV_TX_BUSY;
 449         }
 450
 451 failed:
 452         /* Free up the WEP buffer if it's not the same as the skb */
 453         if ((p80211_wep.data) && (p80211_wep.data != skb->data))
 454                 kfree(p80211_wep.data);
 455
 456         /* we always free the skb here, never in a lower level. */
 457         if (!result)
 458                 dev_kfree_skb(skb);
 459
 460         return result;
 461 }
 462
 463 /*----------------------------------------------------------------
 464 * p80211knetdev_set_multicast_list
 465 *
 466 * Called from higher lavers whenever there's a need to set/clear
 467 * promiscuous mode or rewrite the multicast list.
 468 *
 469 * Arguments:
 470 *       none
 471 *
 472 * Returns:
 473 *       nothing
 474 ----------------------------------------------------------------*/
 475 static void p80211knetdev_set_multicast_list(netdevice_t * dev)
 476 {
 477         wlandevice_t *wlandev = dev->ml_priv;
 478
 479         /* TODO:  real multicast support as well */
 480
 481         if (wlandev->set_multicast_list)
 482                 wlandev->set_multicast_list(wlandev, dev);
 483
 484 }
 485
 486 #ifdef SIOCETHTOOL
 487
 488 static int p80211netdev_ethtool(wlandevice_t * wlandev, void __user * useraddr)
 489 {
 490         u32 ethcmd;
 491         struct ethtool_drvinfo info;
 492         struct ethtool_value edata;
 493
 494         memset(&info, 0, sizeof(info));
 495         memset(&edata, 0, sizeof(edata));
 496
 497         if (copy_from_user(&ethcmd, useraddr, sizeof(ethcmd)))
 498                 return -EFAULT;
 499
 500         switch (ethcmd) {
 501         case ETHTOOL_GDRVINFO:
 502                 info.cmd = ethcmd;
 503                 snprintf(info.driver, sizeof(info.driver), "p80211_%s",
 504                          wlandev->nsdname);
 505                 snprintf(info.version, sizeof(info.version), "%s",
 506                          WLAN_RELEASE);
 507
 508                 if (copy_to_user(useraddr, &info, sizeof(info)))
 509                         return -EFAULT;
 510                 return 0;
 511 #ifdef ETHTOOL_GLINK
 512         case ETHTOOL_GLINK:
 513                 edata.cmd = ethcmd;
 514
 515                 if (wlandev->linkstatus &&
 516                     (wlandev->macmode != WLAN_MACMODE_NONE)) {
 517                         edata.data = 1;
 518                 } else {
 519                         edata.data = 0;
 520                 }
 521
 522                 if (copy_to_user(useraddr, &edata, sizeof(edata)))
 523                         return -EFAULT;
 524                 return 0;
 525         }
 526 #endif
 527
 528         return -EOPNOTSUPP;
 529 }
 530
 531 #endif
 532
 533 /*----------------------------------------------------------------
 534 * p80211knetdev_do_ioctl
 535 *
 536 * Handle an ioctl call on one of our devices.  Everything Linux
 537 * ioctl specific is done here.  Then we pass the contents of the
 538 * ifr->data to the request message handler.
 539 *
 540 * Arguments:
 541 *       dev     Linux kernel netdevice
 542 *       ifr     Our private ioctl request structure, typed for the
 543 *               generic struct ifreq so we can use ptr to func
 544 *               w/o cast.
 545 *
 546 * Returns:
 547 *       zero on success, a negative errno on failure.  Possible values:
 548 *               -ENETDOWN Device isn't up.
 549 *               -EBUSY  cmd already in progress
 550 *               -ETIME  p80211 cmd timed out (MSD may have its own timers)
 551 *               -EFAULT memory fault copying msg from user buffer
 552 *               -ENOMEM unable to allocate kernel msg buffer
 553 *               -ENOSYS bad magic, it the cmd really for us?
 554 *               -EintR  sleeping on cmd, awakened by signal, cmd cancelled.
 555 *
 556 * Call Context:
 557 *       Process thread (ioctl caller).  TODO: SMP support may require
 558 *       locks.
 559 ----------------------------------------------------------------*/
 560 static int p80211knetdev_do_ioctl(netdevice_t * dev, struct ifreq *ifr, int cmd)
 561 {
 562         int result = 0;
 563         p80211ioctl_req_t *req = (p80211ioctl_req_t *) ifr;
 564         wlandevice_t *wlandev = dev->ml_priv;
 565         u8 *msgbuf;
 566
 567         pr_debug("rx'd ioctl, cmd=%d, len=%d\n", cmd, req->len);
 568
 569 #ifdef SIOCETHTOOL
 570         if (cmd == SIOCETHTOOL) {
 571                 result =
 572                     p80211netdev_ethtool(wlandev, (void __user *)ifr->ifr_data);
 573                 goto bail;
 574         }
 575 #endif
 576
 577         /* Test the magic, assume ifr is good if it's there */
 578         if (req->magic != P80211_IOCTL_MAGIC) {
 579                 result = -ENOSYS;
 580                 goto bail;
 581         }
 582
 583         if (cmd == P80211_IFTEST) {
 584                 result = 0;
 585                 goto bail;
 586         } else if (cmd != P80211_IFREQ) {
 587                 result = -ENOSYS;
 588                 goto bail;
 589         }
 590
 591         /* Allocate a buf of size req->len */
 592         if ((msgbuf = kmalloc(req->len, GFP_KERNEL))) {
 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         return result;          /* If allocate,copyfrom or copyto fails, return errno */
 610 }
 611
 612 /*----------------------------------------------------------------
 613 * p80211knetdev_set_mac_address
 614 *
 615 * Handles the ioctl for changing the MACAddress of a netdevice
 616 *
 617 * references: linux/netdevice.h and drivers/net/net_init.c
 618 *
 619 * NOTE: [MSM] We only prevent address changes when the netdev is
 620 * up.  We don't control anything based on dot11 state.  If the
 621 * address is changed on a STA that's currently associated, you
 622 * will probably lose the ability to send and receive data frames.
 623 * Just be aware.  Therefore, this should usually only be done
 624 * prior to scan/join/auth/assoc.
 625 *
 626 * Arguments:
 627 *       dev     netdevice struct
 628 *       addr    the new MACAddress (a struct)
 629 *
 630 * Returns:
 631 *       zero on success, a negative errno on failure.  Possible values:
 632 *               -EBUSY  device is bussy (cmd not possible)
 633 *               -and errors returned by: p80211req_dorequest(..)
 634 *
 635 * by: Collin R. Mulliner <collin@mulliner.org>
 636 ----------------------------------------------------------------*/
 637 static int p80211knetdev_set_mac_address(netdevice_t * dev, void *addr)
 638 {
 639         struct sockaddr *new_addr = addr;
 640         p80211msg_dot11req_mibset_t dot11req;
 641         p80211item_unk392_t *mibattr;
 642         p80211item_pstr6_t *macaddr;
 643         p80211item_uint32_t *resultcode;
 644         int result = 0;
 645
 646         /* If we're running, we don't allow MAC address changes */
 647         if (netif_running(dev))
 648                 return -EBUSY;
 649
 650         /* Set up some convenience pointers. */
 651         mibattr = &dot11req.mibattribute;
 652         macaddr = (p80211item_pstr6_t *) & mibattr->data;
 653         resultcode = &dot11req.resultcode;
 654
 655         /* Set up a dot11req_mibset */
 656         memset(&dot11req, 0, sizeof(p80211msg_dot11req_mibset_t));
 657         dot11req.msgcode = DIDmsg_dot11req_mibset;
 658         dot11req.msglen = sizeof(p80211msg_dot11req_mibset_t);
 659         memcpy(dot11req.devname,
 660                ((wlandevice_t *) dev->ml_priv)->name, WLAN_DEVNAMELEN_MAX - 1);
 661
 662         /* Set up the mibattribute argument */
 663         mibattr->did = DIDmsg_dot11req_mibset_mibattribute;
 664         mibattr->status = P80211ENUM_msgitem_status_data_ok;
 665         mibattr->len = sizeof(mibattr->data);
 666
 667         macaddr->did = DIDmib_dot11mac_dot11OperationTable_dot11MACAddress;
 668         macaddr->status = P80211ENUM_msgitem_status_data_ok;
 669         macaddr->len = sizeof(macaddr->data);
 670         macaddr->data.len = ETH_ALEN;
 671         memcpy(&macaddr->data.data, new_addr->sa_data, ETH_ALEN);
 672
 673         /* Set up the resultcode argument */
 674         resultcode->did = DIDmsg_dot11req_mibset_resultcode;
 675         resultcode->status = P80211ENUM_msgitem_status_no_value;
 676         resultcode->len = sizeof(resultcode->data);
 677         resultcode->data = 0;
 678
 679         /* now fire the request */
 680         result = p80211req_dorequest(dev->ml_priv, (u8 *) & dot11req);
 681
 682         /* If the request wasn't successful, report an error and don't
 683          * change the netdev address
 684          */
 685         if (result != 0 || resultcode->data != P80211ENUM_resultcode_success) {
 686                 printk(KERN_ERR
 687                        "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_multicast_list = 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 * Returns:
 738 *       zero on success, non-zero otherwise.
 739 * Call Context:
 740 *       Should be process thread.  We'll assume it might be
 741 *       interrupt though.  When we add support for statically
 742 *       compiled drivers, this function will be called in the
 743 *       context of the kernel startup code.
 744 ----------------------------------------------------------------*/
 745 int wlan_setup(wlandevice_t * wlandev)
 746 {
 747         int result = 0;
 748         netdevice_t *dev;
 749
 750         /* Set up the wlandev */
 751         wlandev->state = WLAN_DEVICE_CLOSED;
 752         wlandev->ethconv = WLAN_ETHCONV_8021h;
 753         wlandev->macmode = WLAN_MACMODE_NONE;
 754
 755         /* Set up the rx queue */
 756         skb_queue_head_init(&wlandev->nsd_rxq);
 757         tasklet_init(&wlandev->rx_bh,
 758                      p80211netdev_rx_bh, (unsigned long)wlandev);
 759
 760         /* Allocate and initialize the struct device */
 761         dev = alloc_netdev(0, "wlan%d", ether_setup);
 762         if (dev == NULL) {
 763                 printk(KERN_ERR "Failed to alloc netdev.\n");
 764                 result = 1;
 765         } else {
 766                 wlandev->netdev = dev;
 767                 dev->ml_priv = wlandev;
 768                 dev->netdev_ops = &p80211_netdev_ops;
 769
 770 #if (WIRELESS_EXT < 21)
 771                 dev->get_wireless_stats = p80211wext_get_wireless_stats;
 772 #endif
 773                 dev->wireless_handlers = &p80211wext_handler_def;
 774
 775                 netif_stop_queue(dev);
 776                 netif_carrier_off(dev);
 777         }
 778
 779         return result;
 780 }
 781
 782 /*----------------------------------------------------------------
 783 * wlan_unsetup
 784 *
 785 * This function is paired with the wlan_setup routine.  It should
 786 * be called after unregister_wlandev.  Basically, all it does is
 787 * free the 'struct device' that's associated with the wlandev.
 788 * We do it here because the 'struct device' isn't allocated
 789 * explicitly in the driver code, it's done in wlan_setup.  To
 790 * do the free in the driver might seem like 'magic'.
 791 *
 792 * Arguments:
 793 *       wlandev         ptr to the wlandev structure for the
 794 *                       interface.
 795 * Returns:
 796 *       zero on success, non-zero otherwise.
 797 * Call Context:
 798 *       Should be process thread.  We'll assume it might be
 799 *       interrupt though.  When we add support for statically
 800 *       compiled drivers, this function will be called in the
 801 *       context of the kernel startup code.
 802 ----------------------------------------------------------------*/
 803 int wlan_unsetup(wlandevice_t * wlandev)
 804 {
 805         int result = 0;
 806
 807         tasklet_kill(&wlandev->rx_bh);
 808
 809         if (wlandev->netdev == NULL) {
 810                 printk(KERN_ERR "called without wlandev->netdev set.\n");
 811                 result = 1;
 812         } else {
 813                 free_netdev(wlandev->netdev);
 814                 wlandev->netdev = NULL;
 815         }
 816
 817         return 0;
 818 }
 819
 820 /*----------------------------------------------------------------
 821 * register_wlandev
 822 *
 823 * Roughly matches the functionality of register_netdev.  This function
 824 * is called after the driver has successfully probed and set up the
 825 * resources for the device.  It's now ready to become a named device
 826 * in the Linux system.
 827 *
 828 * First we allocate a name for the device (if not already set), then
 829 * we call the Linux function register_netdevice.
 830 *
 831 * Arguments:
 832 *       wlandev         ptr to the wlandev structure for the
 833 *                       interface.
 834 * Returns:
 835 *       zero on success, non-zero otherwise.
 836 * Call Context:
 837 *       Can be either interrupt or not.
 838 ----------------------------------------------------------------*/
 839 int register_wlandev(wlandevice_t * wlandev)
 840 {
 841         int i = 0;
 842
 843         i = register_netdev(wlandev->netdev);
 844         if (i)
 845                 return i;
 846
 847         return 0;
 848 }
 849
 850 /*----------------------------------------------------------------
 851 * unregister_wlandev
 852 *
 853 * Roughly matches the functionality of unregister_netdev.  This
 854 * function is called to remove a named device from the system.
 855 *
 856 * First we tell linux that the device should no longer exist.
 857 * Then we remove it from the list of known wlan devices.
 858 *
 859 * Arguments:
 860 *       wlandev         ptr to the wlandev structure for the
 861 *                       interface.
 862 * Returns:
 863 *       zero on success, non-zero otherwise.
 864 * Call Context:
 865 *       Can be either interrupt or not.
 866 ----------------------------------------------------------------*/
 867 int unregister_wlandev(wlandevice_t * wlandev)
 868 {
 869         struct sk_buff *skb;
 870
 871         unregister_netdev(wlandev->netdev);
 872
 873         /* Now to clean out the rx queue */
 874         while ((skb = skb_dequeue(&wlandev->nsd_rxq)))
 875                 dev_kfree_skb(skb);
 876
 877         return 0;
 878 }
 879
 880 /*----------------------------------------------------------------
 881 * p80211netdev_hwremoved
 882 *
 883 * Hardware removed notification. This function should be called
 884 * immediately after an MSD has detected that the underlying hardware
 885 * has been yanked out from under us.  The primary things we need
 886 * to do are:
 887 *   - Mark the wlandev
 888 *   - Prevent any further traffic from the knetdev i/f
 889 *   - Prevent any further requests from mgmt i/f
 890 *   - If there are any waitq'd mgmt requests or mgmt-frame exchanges,
 891 *     shut them down.
 892 *   - Call the MSD hwremoved function.
 893 *
 894 * The remainder of the cleanup will be handled by unregister().
 895 * Our primary goal here is to prevent as much tickling of the MSD
 896 * as possible since the MSD is already in a 'wounded' state.
 897 *
 898 * TODO: As new features are added, this function should be
 899 *       updated.
 900 *
 901 * Arguments:
 902 *       wlandev         WLAN network device structure
 903 * Returns:
 904 *       nothing
 905 * Side effects:
 906 *
 907 * Call context:
 908 *       Usually interrupt.
 909 ----------------------------------------------------------------*/
 910 void p80211netdev_hwremoved(wlandevice_t * wlandev)
 911 {
 912         wlandev->hwremoved = 1;
 913         if (wlandev->state == WLAN_DEVICE_OPEN)
 914                 netif_stop_queue(wlandev->netdev);
 915
 916         netif_device_detach(wlandev->netdev);
 917 }
 918
 919 /*----------------------------------------------------------------
 920 * p80211_rx_typedrop
 921 *
 922 * Classifies the frame, increments the appropriate counter, and
 923 * returns 0|1|2 indicating whether the driver should handle, ignore, or
 924 * drop the frame
 925 *
 926 * Arguments:
 927 *       wlandev         wlan device structure
 928 *       fc              frame control field
 929 *
 930 * Returns:
 931 *       zero if the frame should be handled by the driver,
 932 *       one if the frame should be ignored
 933 *       anything else means we drop it.
 934 *
 935 * Side effects:
 936 *
 937 * Call context:
 938 *       interrupt
 939 ----------------------------------------------------------------*/
 940 static int p80211_rx_typedrop(wlandevice_t * wlandev, u16 fc)
 941 {
 942         u16 ftype;
 943         u16 fstype;
 944         int drop = 0;
 945         /* Classify frame, increment counter */
 946         ftype = WLAN_GET_FC_FTYPE(fc);
 947         fstype = WLAN_GET_FC_FSTYPE(fc);
 948 #if 0
 949         pr_debug("rx_typedrop : ftype=%d fstype=%d.\n", ftype, fstype);
 950 #endif
 951         switch (ftype) {
 952         case WLAN_FTYPE_MGMT:
 953                 if ((wlandev->netdev->flags & IFF_PROMISC) ||
 954                     (wlandev->netdev->flags & IFF_ALLMULTI)) {
 955                         drop = 1;
 956                         break;
 957                 }
 958                 pr_debug("rx'd mgmt:\n");
 959                 wlandev->rx.mgmt++;
 960                 switch (fstype) {
 961                 case WLAN_FSTYPE_ASSOCREQ:
 962                         /* printk("assocreq"); */
 963                         wlandev->rx.assocreq++;
 964                         break;
 965                 case WLAN_FSTYPE_ASSOCRESP:
 966                         /* printk("assocresp"); */
 967                         wlandev->rx.assocresp++;
 968                         break;
 969                 case WLAN_FSTYPE_REASSOCREQ:
 970                         /* printk("reassocreq"); */
 971                         wlandev->rx.reassocreq++;
 972                         break;
 973                 case WLAN_FSTYPE_REASSOCRESP:
 974                         /* printk("reassocresp"); */
 975                         wlandev->rx.reassocresp++;
 976                         break;
 977                 case WLAN_FSTYPE_PROBEREQ:
 978                         /* printk("probereq"); */
 979                         wlandev->rx.probereq++;
 980                         break;
 981                 case WLAN_FSTYPE_PROBERESP:
 982                         /* printk("proberesp"); */
 983                         wlandev->rx.proberesp++;
 984                         break;
 985                 case WLAN_FSTYPE_BEACON:
 986                         /* printk("beacon"); */
 987                         wlandev->rx.beacon++;
 988                         break;
 989                 case WLAN_FSTYPE_ATIM:
 990                         /* printk("atim"); */
 991                         wlandev->rx.atim++;
 992                         break;
 993                 case WLAN_FSTYPE_DISASSOC:
 994                         /* printk("disassoc"); */
 995                         wlandev->rx.disassoc++;
 996                         break;
 997                 case WLAN_FSTYPE_AUTHEN:
 998                         /* printk("authen"); */
 999                         wlandev->rx.authen++;
1000                         break;
1001                 case WLAN_FSTYPE_DEAUTHEN:
1002                         /* printk("deauthen"); */
1003                         wlandev->rx.deauthen++;
1004                         break;
1005                 default:
1006                         /* printk("unknown"); */
1007                         wlandev->rx.mgmt_unknown++;
1008                         break;
1009                 }
1010                 /* printk("\n"); */
1011                 drop = 2;
1012                 break;
1013
1014         case WLAN_FTYPE_CTL:
1015                 if ((wlandev->netdev->flags & IFF_PROMISC) ||
1016                     (wlandev->netdev->flags & IFF_ALLMULTI)) {
1017                         drop = 1;
1018                         break;
1019                 }
1020                 pr_debug("rx'd ctl:\n");
1021                 wlandev->rx.ctl++;
1022                 switch (fstype) {
1023                 case WLAN_FSTYPE_PSPOLL:
1024                         /* printk("pspoll"); */
1025                         wlandev->rx.pspoll++;
1026                         break;
1027                 case WLAN_FSTYPE_RTS:
1028                         /* printk("rts"); */
1029                         wlandev->rx.rts++;
1030                         break;
1031                 case WLAN_FSTYPE_CTS:
1032                         /* printk("cts"); */
1033                         wlandev->rx.cts++;
1034                         break;
1035                 case WLAN_FSTYPE_ACK:
1036                         /* printk("ack"); */
1037                         wlandev->rx.ack++;
1038                         break;
1039                 case WLAN_FSTYPE_CFEND:
1040                         /* printk("cfend"); */
1041                         wlandev->rx.cfend++;
1042                         break;
1043                 case WLAN_FSTYPE_CFENDCFACK:
1044                         /* printk("cfendcfack"); */
1045                         wlandev->rx.cfendcfack++;
1046                         break;
1047                 default:
1048                         /* printk("unknown"); */
1049                         wlandev->rx.ctl_unknown++;
1050                         break;
1051                 }
1052                 /* printk("\n"); */
1053                 drop = 2;
1054                 break;
1055
1056         case WLAN_FTYPE_DATA:
1057                 wlandev->rx.data++;
1058                 switch (fstype) {
1059                 case WLAN_FSTYPE_DATAONLY:
1060                         wlandev->rx.dataonly++;
1061                         break;
1062                 case WLAN_FSTYPE_DATA_CFACK:
1063                         wlandev->rx.data_cfack++;
1064                         break;
1065                 case WLAN_FSTYPE_DATA_CFPOLL:
1066                         wlandev->rx.data_cfpoll++;
1067                         break;
1068                 case WLAN_FSTYPE_DATA_CFACK_CFPOLL:
1069                         wlandev->rx.data__cfack_cfpoll++;
1070                         break;
1071                 case WLAN_FSTYPE_NULL:
1072                         pr_debug("rx'd data:null\n");
1073                         wlandev->rx.null++;
1074                         break;
1075                 case WLAN_FSTYPE_CFACK:
1076                         pr_debug("rx'd data:cfack\n");
1077                         wlandev->rx.cfack++;
1078                         break;
1079                 case WLAN_FSTYPE_CFPOLL:
1080                         pr_debug("rx'd data:cfpoll\n");
1081                         wlandev->rx.cfpoll++;
1082                         break;
1083                 case WLAN_FSTYPE_CFACK_CFPOLL:
1084                         pr_debug("rx'd data:cfack_cfpoll\n");
1085                         wlandev->rx.cfack_cfpoll++;
1086                         break;
1087                 default:
1088                         /* printk("unknown"); */
1089                         wlandev->rx.data_unknown++;
1090                         break;
1091                 }
1092
1093                 break;
1094         }
1095         return drop;
1096 }
1097
1098 static void p80211knetdev_tx_timeout(netdevice_t * netdev)
1099 {
1100         wlandevice_t *wlandev = netdev->ml_priv;
1101
1102         if (wlandev->tx_timeout) {
1103                 wlandev->tx_timeout(wlandev);
1104         } else {
1105                 printk(KERN_WARNING "Implement tx_timeout for %s\n",
1106                        wlandev->nsdname);
1107                 netif_wake_queue(wlandev->netdev);
1108         }
1109 }