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   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 #include "p80211types.h"
  80 #include "p80211hdr.h"
  81 #include "p80211conv.h"
  82 #include "p80211mgmt.h"
  83 #include "p80211msg.h"
  84 #include "p80211netdev.h"
  85 #include "p80211ioctl.h"
  86 #include "p80211req.h"
  87 #include "p80211metastruct.h"
  88 #include "p80211metadef.h"
  89
  90 /* Support functions */
  91 static void p80211netdev_rx_bh(unsigned long arg);
  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
 241         tasklet_schedule(&wlandev->rx_bh);
 242
 243         return;
 244 }
 245
 246 /*----------------------------------------------------------------
 247 * p80211netdev_rx_bh
 248 *
 249 * Deferred processing of all received frames.
 250 *
 251 * Arguments:
 252 *       wlandev         WLAN network device structure
 253 *       skb             skbuff containing a full 802.11 frame.
 254 * Returns:
 255 *       nothing
 256 * Side effects:
 257 *
 258 ----------------------------------------------------------------*/
 259 static void p80211netdev_rx_bh(unsigned long arg)
 260 {
 261         wlandevice_t *wlandev = (wlandevice_t *) arg;
 262         struct sk_buff *skb = NULL;
 263         netdevice_t *dev = wlandev->netdev;
 264         p80211_hdr_a3_t *hdr;
 265         u16 fc;
 266
 267         /* Let's empty our our queue */
 268         while ((skb = skb_dequeue(&wlandev->nsd_rxq))) {
 269                 if (wlandev->state == WLAN_DEVICE_OPEN) {
 270
 271                         if (dev->type != ARPHRD_ETHER) {
 272                                 /* RAW frame; we shouldn't convert it */
 273                                 /* XXX Append the Prism Header here instead. */
 274
 275                                 /* set up various data fields */
 276                                 skb->dev = dev;
 277                                 skb_reset_mac_header(skb);
 278                                 skb->ip_summed = CHECKSUM_NONE;
 279                                 skb->pkt_type = PACKET_OTHERHOST;
 280                                 skb->protocol = htons(ETH_P_80211_RAW);
 281                                 dev->last_rx = jiffies;
 282
 283                                 wlandev->linux_stats.rx_packets++;
 284                                 wlandev->linux_stats.rx_bytes += skb->len;
 285                                 netif_rx_ni(skb);
 286                                 continue;
 287                         } else {
 288                                 hdr = (p80211_hdr_a3_t *) skb->data;
 289                                 fc = le16_to_cpu(hdr->fc);
 290                                 if (p80211_rx_typedrop(wlandev, fc)) {
 291                                         dev_kfree_skb(skb);
 292                                         continue;
 293                                 }
 294
 295                                 /* perform mcast filtering */
 296                                 if (wlandev->netdev->flags & IFF_ALLMULTI) {
 297                                         /* allow my local address through */
 298                                         if (memcmp
 299                                             (hdr->a1, wlandev->netdev->dev_addr,
 300                                              ETH_ALEN) != 0) {
 301                                                 /* but reject anything else that isn't multicast */
 302                                                 if (!(hdr->a1[0] & 0x01)) {
 303                                                         dev_kfree_skb(skb);
 304                                                         continue;
 305                                                 }
 306                                         }
 307                                 }
 308
 309                                 if (skb_p80211_to_ether
 310                                     (wlandev, wlandev->ethconv, skb) == 0) {
 311                                         skb->dev->last_rx = jiffies;
 312                                         wlandev->linux_stats.rx_packets++;
 313                                         wlandev->linux_stats.rx_bytes +=
 314                                             skb->len;
 315                                         netif_rx_ni(skb);
 316                                         continue;
 317                                 }
 318                                 pr_debug("p80211_to_ether failed.\n");
 319                         }
 320                 }
 321                 dev_kfree_skb(skb);
 322         }
 323 }
 324
 325 /*----------------------------------------------------------------
 326 * p80211knetdev_hard_start_xmit
 327 *
 328 * Linux netdevice method for transmitting a frame.
 329 *
 330 * Arguments:
 331 *       skb     Linux sk_buff containing the frame.
 332 *       netdev  Linux netdevice.
 333 *
 334 * Side effects:
 335 *       If the lower layers report that buffers are full. netdev->tbusy
 336 *       will be set to prevent higher layers from sending more traffic.
 337 *
 338 *       Note: If this function returns non-zero, higher layers retain
 339 *             ownership of the skb.
 340 *
 341 * Returns:
 342 *       zero on success, non-zero on failure.
 343 ----------------------------------------------------------------*/
 344 static int p80211knetdev_hard_start_xmit(struct sk_buff *skb,
 345                                          netdevice_t *netdev)
 346 {
 347         int result = 0;
 348         int txresult = -1;
 349         wlandevice_t *wlandev = netdev->ml_priv;
 350         p80211_hdr_t p80211_hdr;
 351         p80211_metawep_t p80211_wep;
 352
 353         if (skb == NULL)
 354                 return NETDEV_TX_OK;
 355
 356         if (wlandev->state != WLAN_DEVICE_OPEN) {
 357                 result = 1;
 358                 goto failed;
 359         }
 360
 361         memset(&p80211_hdr, 0, sizeof(p80211_hdr_t));
 362         memset(&p80211_wep, 0, sizeof(p80211_metawep_t));
 363
 364         if (netif_queue_stopped(netdev)) {
 365                 pr_debug("called when queue stopped.\n");
 366                 result = 1;
 367                 goto failed;
 368         }
 369
 370         netif_stop_queue(netdev);
 371
 372         /* Check to see that a valid mode is set */
 373         switch (wlandev->macmode) {
 374         case WLAN_MACMODE_IBSS_STA:
 375         case WLAN_MACMODE_ESS_STA:
 376         case WLAN_MACMODE_ESS_AP:
 377                 break;
 378         default:
 379                 /* Mode isn't set yet, just drop the frame
 380                  * and return success .
 381                  * TODO: we need a saner way to handle this
 382                  */
 383                 if (skb->protocol != ETH_P_80211_RAW) {
 384                         netif_start_queue(wlandev->netdev);
 385                         printk(KERN_NOTICE
 386                                "Tx attempt prior to association, frame dropped.\n");
 387                         wlandev->linux_stats.tx_dropped++;
 388                         result = 0;
 389                         goto failed;
 390                 }
 391                 break;
 392         }
 393
 394         /* Check for raw transmits */
 395         if (skb->protocol == ETH_P_80211_RAW) {
 396                 if (!capable(CAP_NET_ADMIN)) {
 397                         result = 1;
 398                         goto failed;
 399                 }
 400                 /* move the header over */
 401                 memcpy(&p80211_hdr, skb->data, sizeof(p80211_hdr_t));
 402                 skb_pull(skb, sizeof(p80211_hdr_t));
 403         } else {
 404                 if (skb_ether_to_p80211
 405                     (wlandev, wlandev->ethconv, skb, &p80211_hdr,
 406                      &p80211_wep) != 0) {
 407                         /* convert failed */
 408                         pr_debug("ether_to_80211(%d) failed.\n",
 409                                  wlandev->ethconv);
 410                         result = 1;
 411                         goto failed;
 412                 }
 413         }
 414         if (wlandev->txframe == NULL) {
 415                 result = 1;
 416                 goto failed;
 417         }
 418
 419         netdev->trans_start = jiffies;
 420
 421         wlandev->linux_stats.tx_packets++;
 422         /* count only the packet payload */
 423         wlandev->linux_stats.tx_bytes += skb->len;
 424
 425         txresult = wlandev->txframe(wlandev, skb, &p80211_hdr, &p80211_wep);
 426
 427         if (txresult == 0) {
 428                 /* success and more buf */
 429                 /* avail, re: hw_txdata */
 430                 netif_wake_queue(wlandev->netdev);
 431                 result = NETDEV_TX_OK;
 432         } else if (txresult == 1) {
 433                 /* success, no more avail */
 434                 pr_debug("txframe success, no more bufs\n");
 435                 /* netdev->tbusy = 1;  don't set here, irqhdlr */
 436                 /*   may have already cleared it */
 437                 result = NETDEV_TX_OK;
 438         } else if (txresult == 2) {
 439                 /* alloc failure, drop frame */
 440                 pr_debug("txframe returned alloc_fail\n");
 441                 result = NETDEV_TX_BUSY;
 442         } else {
 443                 /* buffer full or queue busy, drop frame. */
 444                 pr_debug("txframe returned full or busy\n");
 445                 result = NETDEV_TX_BUSY;
 446         }
 447
 448 failed:
 449         /* Free up the WEP buffer if it's not the same as the skb */
 450         if ((p80211_wep.data) && (p80211_wep.data != skb->data))
 451                 kzfree(p80211_wep.data);
 452
 453         /* we always free the skb here, never in a lower level. */
 454         if (!result)
 455                 dev_kfree_skb(skb);
 456
 457         return result;
 458 }
 459
 460 /*----------------------------------------------------------------
 461 * p80211knetdev_set_multicast_list
 462 *
 463 * Called from higher lavers whenever there's a need to set/clear
 464 * promiscuous mode or rewrite the multicast list.
 465 *
 466 * Arguments:
 467 *       none
 468 *
 469 * Returns:
 470 *       nothing
 471 ----------------------------------------------------------------*/
 472 static void p80211knetdev_set_multicast_list(netdevice_t *dev)
 473 {
 474         wlandevice_t *wlandev = dev->ml_priv;
 475
 476         /* TODO:  real multicast support as well */
 477
 478         if (wlandev->set_multicast_list)
 479                 wlandev->set_multicast_list(wlandev, dev);
 480
 481 }
 482
 483 #ifdef SIOCETHTOOL
 484
 485 static int p80211netdev_ethtool(wlandevice_t *wlandev, void __user *useraddr)
 486 {
 487         u32 ethcmd;
 488         struct ethtool_drvinfo info;
 489         struct ethtool_value edata;
 490
 491         memset(&info, 0, sizeof(info));
 492         memset(&edata, 0, sizeof(edata));
 493
 494         if (copy_from_user(&ethcmd, useraddr, sizeof(ethcmd)))
 495                 return -EFAULT;
 496
 497         switch (ethcmd) {
 498         case ETHTOOL_GDRVINFO:
 499                 info.cmd = ethcmd;
 500                 snprintf(info.driver, sizeof(info.driver), "p80211_%s",
 501                          wlandev->nsdname);
 502                 snprintf(info.version, sizeof(info.version), "%s",
 503                          WLAN_RELEASE);
 504
 505                 if (copy_to_user(useraddr, &info, sizeof(info)))
 506                         return -EFAULT;
 507                 return 0;
 508 #ifdef ETHTOOL_GLINK
 509         case ETHTOOL_GLINK:
 510                 edata.cmd = ethcmd;
 511
 512                 if (wlandev->linkstatus &&
 513                     (wlandev->macmode != WLAN_MACMODE_NONE)) {
 514                         edata.data = 1;
 515                 } else {
 516                         edata.data = 0;
 517                 }
 518
 519                 if (copy_to_user(useraddr, &edata, sizeof(edata)))
 520                         return -EFAULT;
 521                 return 0;
 522         }
 523 #endif
 524
 525         return -EOPNOTSUPP;
 526 }
 527
 528 #endif
 529
 530 /*----------------------------------------------------------------
 531 * p80211knetdev_do_ioctl
 532 *
 533 * Handle an ioctl call on one of our devices.  Everything Linux
 534 * ioctl specific is done here.  Then we pass the contents of the
 535 * ifr->data to the request message handler.
 536 *
 537 * Arguments:
 538 *       dev     Linux kernel netdevice
 539 *       ifr     Our private ioctl request structure, typed for the
 540 *               generic struct ifreq so we can use ptr to func
 541 *               w/o cast.
 542 *
 543 * Returns:
 544 *       zero on success, a negative errno on failure.  Possible values:
 545 *               -ENETDOWN Device isn't up.
 546 *               -EBUSY  cmd already in progress
 547 *               -ETIME  p80211 cmd timed out (MSD may have its own timers)
 548 *               -EFAULT memory fault copying msg from user buffer
 549 *               -ENOMEM unable to allocate kernel msg buffer
 550 *               -ENOSYS bad magic, it the cmd really for us?
 551 *               -EintR  sleeping on cmd, awakened by signal, cmd cancelled.
 552 *
 553 * Call Context:
 554 *       Process thread (ioctl caller).  TODO: SMP support may require
 555 *       locks.
 556 ----------------------------------------------------------------*/
 557 static int p80211knetdev_do_ioctl(netdevice_t *dev, struct ifreq *ifr, int cmd)
 558 {
 559         int result = 0;
 560         p80211ioctl_req_t *req = (p80211ioctl_req_t *) ifr;
 561         wlandevice_t *wlandev = dev->ml_priv;
 562         u8 *msgbuf;
 563
 564         pr_debug("rx'd ioctl, cmd=%d, len=%d\n", cmd, req->len);
 565
 566 #ifdef SIOCETHTOOL
 567         if (cmd == SIOCETHTOOL) {
 568                 result =
 569                     p80211netdev_ethtool(wlandev, (void __user *)ifr->ifr_data);
 570                 goto bail;
 571         }
 572 #endif
 573
 574         /* Test the magic, assume ifr is good if it's there */
 575         if (req->magic != P80211_IOCTL_MAGIC) {
 576                 result = -ENOSYS;
 577                 goto bail;
 578         }
 579
 580         if (cmd == P80211_IFTEST) {
 581                 result = 0;
 582                 goto bail;
 583         } else if (cmd != P80211_IFREQ) {
 584                 result = -ENOSYS;
 585                 goto bail;
 586         }
 587
 588         /* Allocate a buf of size req->len */
 589         msgbuf = kmalloc(req->len, GFP_KERNEL);
 590         if (msgbuf) {
 591                 if (copy_from_user(msgbuf, (void __user *)req->data, req->len))
 592                         result = -EFAULT;
 593                 else
 594                         result = p80211req_dorequest(wlandev, msgbuf);
 595
 596                 if (result == 0) {
 597                         if (copy_to_user
 598                             ((void __user *)req->data, msgbuf, req->len)) {
 599                                 result = -EFAULT;
 600                         }
 601                 }
 602                 kfree(msgbuf);
 603         } else {
 604                 result = -ENOMEM;
 605         }
 606 bail:
 607         return result;          /* If allocate,copyfrom or copyto fails, return errno */
 608 }
 609
 610 /*----------------------------------------------------------------
 611 * p80211knetdev_set_mac_address
 612 *
 613 * Handles the ioctl for changing the MACAddress of a netdevice
 614 *
 615 * references: linux/netdevice.h and drivers/net/net_init.c
 616 *
 617 * NOTE: [MSM] We only prevent address changes when the netdev is
 618 * up.  We don't control anything based on dot11 state.  If the
 619 * address is changed on a STA that's currently associated, you
 620 * will probably lose the ability to send and receive data frames.
 621 * Just be aware.  Therefore, this should usually only be done
 622 * prior to scan/join/auth/assoc.
 623 *
 624 * Arguments:
 625 *       dev     netdevice struct
 626 *       addr    the new MACAddress (a struct)
 627 *
 628 * Returns:
 629 *       zero on success, a negative errno on failure.  Possible values:
 630 *               -EBUSY  device is bussy (cmd not possible)
 631 *               -and errors returned by: p80211req_dorequest(..)
 632 *
 633 * by: Collin R. Mulliner <collin@mulliner.org>
 634 ----------------------------------------------------------------*/
 635 static int p80211knetdev_set_mac_address(netdevice_t *dev, void *addr)
 636 {
 637         struct sockaddr *new_addr = addr;
 638         p80211msg_dot11req_mibset_t dot11req;
 639         p80211item_unk392_t *mibattr;
 640         p80211item_pstr6_t *macaddr;
 641         p80211item_uint32_t *resultcode;
 642         int result = 0;
 643
 644         /* If we're running, we don't allow MAC address changes */
 645         if (netif_running(dev))
 646                 return -EBUSY;
 647
 648         /* Set up some convenience pointers. */
 649         mibattr = &dot11req.mibattribute;
 650         macaddr = (p80211item_pstr6_t *) &mibattr->data;
 651         resultcode = &dot11req.resultcode;
 652
 653         /* Set up a dot11req_mibset */
 654         memset(&dot11req, 0, sizeof(p80211msg_dot11req_mibset_t));
 655         dot11req.msgcode = DIDmsg_dot11req_mibset;
 656         dot11req.msglen = sizeof(p80211msg_dot11req_mibset_t);
 657         memcpy(dot11req.devname,
 658                ((wlandevice_t *) dev->ml_priv)->name, WLAN_DEVNAMELEN_MAX - 1);
 659
 660         /* Set up the mibattribute argument */
 661         mibattr->did = DIDmsg_dot11req_mibset_mibattribute;
 662         mibattr->status = P80211ENUM_msgitem_status_data_ok;
 663         mibattr->len = sizeof(mibattr->data);
 664
 665         macaddr->did = DIDmib_dot11mac_dot11OperationTable_dot11MACAddress;
 666         macaddr->status = P80211ENUM_msgitem_status_data_ok;
 667         macaddr->len = sizeof(macaddr->data);
 668         macaddr->data.len = ETH_ALEN;
 669         memcpy(&macaddr->data.data, new_addr->sa_data, ETH_ALEN);
 670
 671         /* Set up the resultcode argument */
 672         resultcode->did = DIDmsg_dot11req_mibset_resultcode;
 673         resultcode->status = P80211ENUM_msgitem_status_no_value;
 674         resultcode->len = sizeof(resultcode->data);
 675         resultcode->data = 0;
 676
 677         /* now fire the request */
 678         result = p80211req_dorequest(dev->ml_priv, (u8 *) &dot11req);
 679
 680         /* If the request wasn't successful, report an error and don't
 681          * change the netdev address
 682          */
 683         if (result != 0 || resultcode->data != P80211ENUM_resultcode_success) {
 684                 printk(KERN_ERR
 685                        "Low-level driver failed dot11req_mibset(dot11MACAddress).\n");
 686                 result = -EADDRNOTAVAIL;
 687         } else {
 688                 /* everything's ok, change the addr in netdev */
 689                 memcpy(dev->dev_addr, new_addr->sa_data, dev->addr_len);
 690         }
 691
 692         return result;
 693 }
 694
 695 static int wlan_change_mtu(netdevice_t *dev, int new_mtu)
 696 {
 697         /* 2312 is max 802.11 payload, 20 is overhead, (ether + llc +snap)
 698            and another 8 for wep. */
 699         if ((new_mtu < 68) || (new_mtu > (2312 - 20 - 8)))
 700                 return -EINVAL;
 701
 702         dev->mtu = new_mtu;
 703
 704         return 0;
 705 }
 706
 707 static const struct net_device_ops p80211_netdev_ops = {
 708         .ndo_init = p80211knetdev_init,
 709         .ndo_open = p80211knetdev_open,
 710         .ndo_stop = p80211knetdev_stop,
 711         .ndo_get_stats = p80211knetdev_get_stats,
 712         .ndo_start_xmit = p80211knetdev_hard_start_xmit,
 713         .ndo_set_multicast_list = p80211knetdev_set_multicast_list,
 714         .ndo_do_ioctl = p80211knetdev_do_ioctl,
 715         .ndo_set_mac_address = p80211knetdev_set_mac_address,
 716         .ndo_tx_timeout = p80211knetdev_tx_timeout,
 717         .ndo_change_mtu = wlan_change_mtu,
 718         .ndo_validate_addr = eth_validate_addr,
 719 };
 720
 721 /*----------------------------------------------------------------
 722 * wlan_setup
 723 *
 724 * Roughly matches the functionality of ether_setup.  Here
 725 * we set up any members of the wlandevice structure that are common
 726 * to all devices.  Additionally, we allocate a linux 'struct device'
 727 * and perform the same setup as ether_setup.
 728 *
 729 * Note: It's important that the caller have setup the wlandev->name
 730 *       ptr prior to calling this function.
 731 *
 732 * Arguments:
 733 *       wlandev         ptr to the wlandev structure for the
 734 *                       interface.
 735 * Returns:
 736 *       zero on success, non-zero otherwise.
 737 * Call Context:
 738 *       Should be process thread.  We'll assume it might be
 739 *       interrupt though.  When we add support for statically
 740 *       compiled drivers, this function will be called in the
 741 *       context of the kernel startup code.
 742 ----------------------------------------------------------------*/
 743 int wlan_setup(wlandevice_t *wlandev)
 744 {
 745         int result = 0;
 746         netdevice_t *dev;
 747
 748         /* Set up the wlandev */
 749         wlandev->state = WLAN_DEVICE_CLOSED;
 750         wlandev->ethconv = WLAN_ETHCONV_8021h;
 751         wlandev->macmode = WLAN_MACMODE_NONE;
 752
 753         /* Set up the rx queue */
 754         skb_queue_head_init(&wlandev->nsd_rxq);
 755         tasklet_init(&wlandev->rx_bh,
 756                      p80211netdev_rx_bh, (unsigned long)wlandev);
 757
 758         /* Allocate and initialize the struct device */
 759         dev = alloc_netdev(0, "wlan%d", ether_setup);
 760         if (dev == NULL) {
 761                 printk(KERN_ERR "Failed to alloc netdev.\n");
 762                 result = 1;
 763         } else {
 764                 wlandev->netdev = dev;
 765                 dev->ml_priv = wlandev;
 766                 dev->netdev_ops = &p80211_netdev_ops;
 767
 768                 dev->wireless_handlers = &p80211wext_handler_def;
 769
 770                 netif_stop_queue(dev);
 771                 netif_carrier_off(dev);
 772         }
 773
 774         return result;
 775 }
 776
 777 /*----------------------------------------------------------------
 778 * wlan_unsetup
 779 *
 780 * This function is paired with the wlan_setup routine.  It should
 781 * be called after unregister_wlandev.  Basically, all it does is
 782 * free the 'struct device' that's associated with the wlandev.
 783 * We do it here because the 'struct device' isn't allocated
 784 * explicitly in the driver code, it's done in wlan_setup.  To
 785 * do the free in the driver might seem like 'magic'.
 786 *
 787 * Arguments:
 788 *       wlandev         ptr to the wlandev structure for the
 789 *                       interface.
 790 * Returns:
 791 *       zero on success, non-zero otherwise.
 792 * Call Context:
 793 *       Should be process thread.  We'll assume it might be
 794 *       interrupt though.  When we add support for statically
 795 *       compiled drivers, this function will be called in the
 796 *       context of the kernel startup code.
 797 ----------------------------------------------------------------*/
 798 int wlan_unsetup(wlandevice_t *wlandev)
 799 {
 800         int result = 0;
 801
 802         tasklet_kill(&wlandev->rx_bh);
 803
 804         if (wlandev->netdev == NULL) {
 805                 printk(KERN_ERR "called without wlandev->netdev set.\n");
 806                 result = 1;
 807         } else {
 808                 free_netdev(wlandev->netdev);
 809                 wlandev->netdev = NULL;
 810         }
 811
 812         return 0;
 813 }
 814
 815 /*----------------------------------------------------------------
 816 * register_wlandev
 817 *
 818 * Roughly matches the functionality of register_netdev.  This function
 819 * is called after the driver has successfully probed and set up the
 820 * resources for the device.  It's now ready to become a named device
 821 * in the Linux system.
 822 *
 823 * First we allocate a name for the device (if not already set), then
 824 * we call the Linux function register_netdevice.
 825 *
 826 * Arguments:
 827 *       wlandev         ptr to the wlandev structure for the
 828 *                       interface.
 829 * Returns:
 830 *       zero on success, non-zero otherwise.
 831 * Call Context:
 832 *       Can be either interrupt or not.
 833 ----------------------------------------------------------------*/
 834 int register_wlandev(wlandevice_t *wlandev)
 835 {
 836         int i = 0;
 837
 838         i = register_netdev(wlandev->netdev);
 839         if (i)
 840                 return i;
 841
 842         return 0;
 843 }
 844
 845 /*----------------------------------------------------------------
 846 * unregister_wlandev
 847 *
 848 * Roughly matches the functionality of unregister_netdev.  This
 849 * function is called to remove a named device from the system.
 850 *
 851 * First we tell linux that the device should no longer exist.
 852 * Then we remove it from the list of known wlan devices.
 853 *
 854 * Arguments:
 855 *       wlandev         ptr to the wlandev structure for the
 856 *                       interface.
 857 * Returns:
 858 *       zero on success, non-zero otherwise.
 859 * Call Context:
 860 *       Can be either interrupt or not.
 861 ----------------------------------------------------------------*/
 862 int unregister_wlandev(wlandevice_t *wlandev)
 863 {
 864         struct sk_buff *skb;
 865
 866         unregister_netdev(wlandev->netdev);
 867
 868         /* Now to clean out the rx queue */
 869         while ((skb = skb_dequeue(&wlandev->nsd_rxq)))
 870                 dev_kfree_skb(skb);
 871
 872         return 0;
 873 }
 874
 875 /*----------------------------------------------------------------
 876 * p80211netdev_hwremoved
 877 *
 878 * Hardware removed notification. This function should be called
 879 * immediately after an MSD has detected that the underlying hardware
 880 * has been yanked out from under us.  The primary things we need
 881 * to do are:
 882 *   - Mark the wlandev
 883 *   - Prevent any further traffic from the knetdev i/f
 884 *   - Prevent any further requests from mgmt i/f
 885 *   - If there are any waitq'd mgmt requests or mgmt-frame exchanges,
 886 *     shut them down.
 887 *   - Call the MSD hwremoved function.
 888 *
 889 * The remainder of the cleanup will be handled by unregister().
 890 * Our primary goal here is to prevent as much tickling of the MSD
 891 * as possible since the MSD is already in a 'wounded' state.
 892 *
 893 * TODO: As new features are added, this function should be
 894 *       updated.
 895 *
 896 * Arguments:
 897 *       wlandev         WLAN network device structure
 898 * Returns:
 899 *       nothing
 900 * Side effects:
 901 *
 902 * Call context:
 903 *       Usually interrupt.
 904 ----------------------------------------------------------------*/
 905 void p80211netdev_hwremoved(wlandevice_t *wlandev)
 906 {
 907         wlandev->hwremoved = 1;
 908         if (wlandev->state == WLAN_DEVICE_OPEN)
 909                 netif_stop_queue(wlandev->netdev);
 910
 911         netif_device_detach(wlandev->netdev);
 912 }
 913
 914 /*----------------------------------------------------------------
 915 * p80211_rx_typedrop
 916 *
 917 * Classifies the frame, increments the appropriate counter, and
 918 * returns 0|1|2 indicating whether the driver should handle, ignore, or
 919 * drop the frame
 920 *
 921 * Arguments:
 922 *       wlandev         wlan device structure
 923 *       fc              frame control field
 924 *
 925 * Returns:
 926 *       zero if the frame should be handled by the driver,
 927 *       one if the frame should be ignored
 928 *       anything else means we drop it.
 929 *
 930 * Side effects:
 931 *
 932 * Call context:
 933 *       interrupt
 934 ----------------------------------------------------------------*/
 935 static int p80211_rx_typedrop(wlandevice_t *wlandev, u16 fc)
 936 {
 937         u16 ftype;
 938         u16 fstype;
 939         int drop = 0;
 940         /* Classify frame, increment counter */
 941         ftype = WLAN_GET_FC_FTYPE(fc);
 942         fstype = WLAN_GET_FC_FSTYPE(fc);
 943 #if 0
 944         pr_debug("rx_typedrop : ftype=%d fstype=%d.\n", ftype, fstype);
 945 #endif
 946         switch (ftype) {
 947         case WLAN_FTYPE_MGMT:
 948                 if ((wlandev->netdev->flags & IFF_PROMISC) ||
 949                     (wlandev->netdev->flags & IFF_ALLMULTI)) {
 950                         drop = 1;
 951                         break;
 952                 }
 953                 pr_debug("rx'd mgmt:\n");
 954                 wlandev->rx.mgmt++;
 955                 switch (fstype) {
 956                 case WLAN_FSTYPE_ASSOCREQ:
 957                         /* printk("assocreq"); */
 958                         wlandev->rx.assocreq++;
 959                         break;
 960                 case WLAN_FSTYPE_ASSOCRESP:
 961                         /* printk("assocresp"); */
 962                         wlandev->rx.assocresp++;
 963                         break;
 964                 case WLAN_FSTYPE_REASSOCREQ:
 965                         /* printk("reassocreq"); */
 966                         wlandev->rx.reassocreq++;
 967                         break;
 968                 case WLAN_FSTYPE_REASSOCRESP:
 969                         /* printk("reassocresp"); */
 970                         wlandev->rx.reassocresp++;
 971                         break;
 972                 case WLAN_FSTYPE_PROBEREQ:
 973                         /* printk("probereq"); */
 974                         wlandev->rx.probereq++;
 975                         break;
 976                 case WLAN_FSTYPE_PROBERESP:
 977                         /* printk("proberesp"); */
 978                         wlandev->rx.proberesp++;
 979                         break;
 980                 case WLAN_FSTYPE_BEACON:
 981                         /* printk("beacon"); */
 982                         wlandev->rx.beacon++;
 983                         break;
 984                 case WLAN_FSTYPE_ATIM:
 985                         /* printk("atim"); */
 986                         wlandev->rx.atim++;
 987                         break;
 988                 case WLAN_FSTYPE_DISASSOC:
 989                         /* printk("disassoc"); */
 990                         wlandev->rx.disassoc++;
 991                         break;
 992                 case WLAN_FSTYPE_AUTHEN:
 993                         /* printk("authen"); */
 994                         wlandev->rx.authen++;
 995                         break;
 996                 case WLAN_FSTYPE_DEAUTHEN:
 997                         /* printk("deauthen"); */
 998                         wlandev->rx.deauthen++;
 999                         break;
1000                 default:
1001                         /* printk("unknown"); */
1002                         wlandev->rx.mgmt_unknown++;
1003                         break;
1004                 }
1005                 /* printk("\n"); */
1006                 drop = 2;
1007                 break;
1008
1009         case WLAN_FTYPE_CTL:
1010                 if ((wlandev->netdev->flags & IFF_PROMISC) ||
1011                     (wlandev->netdev->flags & IFF_ALLMULTI)) {
1012                         drop = 1;
1013                         break;
1014                 }
1015                 pr_debug("rx'd ctl:\n");
1016                 wlandev->rx.ctl++;
1017                 switch (fstype) {
1018                 case WLAN_FSTYPE_PSPOLL:
1019                         /* printk("pspoll"); */
1020                         wlandev->rx.pspoll++;
1021                         break;
1022                 case WLAN_FSTYPE_RTS:
1023                         /* printk("rts"); */
1024                         wlandev->rx.rts++;
1025                         break;
1026                 case WLAN_FSTYPE_CTS:
1027                         /* printk("cts"); */
1028                         wlandev->rx.cts++;
1029                         break;
1030                 case WLAN_FSTYPE_ACK:
1031                         /* printk("ack"); */
1032                         wlandev->rx.ack++;
1033                         break;
1034                 case WLAN_FSTYPE_CFEND:
1035                         /* printk("cfend"); */
1036                         wlandev->rx.cfend++;
1037                         break;
1038                 case WLAN_FSTYPE_CFENDCFACK:
1039                         /* printk("cfendcfack"); */
1040                         wlandev->rx.cfendcfack++;
1041                         break;
1042                 default:
1043                         /* printk("unknown"); */
1044                         wlandev->rx.ctl_unknown++;
1045                         break;
1046                 }
1047                 /* printk("\n"); */
1048                 drop = 2;
1049                 break;
1050
1051         case WLAN_FTYPE_DATA:
1052                 wlandev->rx.data++;
1053                 switch (fstype) {
1054                 case WLAN_FSTYPE_DATAONLY:
1055                         wlandev->rx.dataonly++;
1056                         break;
1057                 case WLAN_FSTYPE_DATA_CFACK:
1058                         wlandev->rx.data_cfack++;
1059                         break;
1060                 case WLAN_FSTYPE_DATA_CFPOLL:
1061                         wlandev->rx.data_cfpoll++;
1062                         break;
1063                 case WLAN_FSTYPE_DATA_CFACK_CFPOLL:
1064                         wlandev->rx.data__cfack_cfpoll++;
1065                         break;
1066                 case WLAN_FSTYPE_NULL:
1067                         pr_debug("rx'd data:null\n");
1068                         wlandev->rx.null++;
1069                         break;
1070                 case WLAN_FSTYPE_CFACK:
1071                         pr_debug("rx'd data:cfack\n");
1072                         wlandev->rx.cfack++;
1073                         break;
1074                 case WLAN_FSTYPE_CFPOLL:
1075                         pr_debug("rx'd data:cfpoll\n");
1076                         wlandev->rx.cfpoll++;
1077                         break;
1078                 case WLAN_FSTYPE_CFACK_CFPOLL:
1079                         pr_debug("rx'd data:cfack_cfpoll\n");
1080                         wlandev->rx.cfack_cfpoll++;
1081                         break;
1082                 default:
1083                         /* printk("unknown"); */
1084                         wlandev->rx.data_unknown++;
1085                         break;
1086                 }
1087
1088                 break;
1089         }
1090         return drop;
1091 }
1092
1093 static void p80211knetdev_tx_timeout(netdevice_t *netdev)
1094 {
1095         wlandevice_t *wlandev = netdev->ml_priv;
1096
1097         if (wlandev->tx_timeout) {
1098                 wlandev->tx_timeout(wlandev);
1099         } else {
1100                 printk(KERN_WARNING "Implement tx_timeout for %s\n",
1101                        wlandev->nsdname);
1102                 netif_wake_queue(wlandev->netdev);
1103         }
1104 }