SAFE public projects git trees. - safe/jmp/linux-2.6/blob - arch/um/drivers/net_kern.c

   1 /*
   2  * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
   3  * James Leu (jleu@mindspring.net).
   4  * Copyright (C) 2001 by various other people who didn't put their name here.
   5  * Licensed under the GPL.
   6  */
   7
   8 #include "linux/config.h"
   9 #include "linux/kernel.h"
  10 #include "linux/netdevice.h"
  11 #include "linux/rtnetlink.h"
  12 #include "linux/skbuff.h"
  13 #include "linux/socket.h"
  14 #include "linux/spinlock.h"
  15 #include "linux/module.h"
  16 #include "linux/init.h"
  17 #include "linux/etherdevice.h"
  18 #include "linux/list.h"
  19 #include "linux/inetdevice.h"
  20 #include "linux/ctype.h"
  21 #include "linux/bootmem.h"
  22 #include "linux/ethtool.h"
  23 #include "linux/platform_device.h"
  24 #include "asm/uaccess.h"
  25 #include "user_util.h"
  26 #include "kern_util.h"
  27 #include "net_kern.h"
  28 #include "net_user.h"
  29 #include "mconsole_kern.h"
  30 #include "init.h"
  31 #include "irq_user.h"
  32 #include "irq_kern.h"
  33
  34 static inline void set_ether_mac(struct net_device *dev, unsigned char *addr)
  35 {
  36         memcpy(dev->dev_addr, addr, ETH_ALEN);
  37 }
  38
  39 #define DRIVER_NAME "uml-netdev"
  40
  41 static DEFINE_SPINLOCK(opened_lock);
  42 static LIST_HEAD(opened);
  43
  44 static int uml_net_rx(struct net_device *dev)
  45 {
  46         struct uml_net_private *lp = dev->priv;
  47         int pkt_len;
  48         struct sk_buff *skb;
  49
  50         /* If we can't allocate memory, try again next round. */
  51         skb = dev_alloc_skb(dev->mtu);
  52         if (skb == NULL) {
  53                 lp->stats.rx_dropped++;
  54                 return 0;
  55         }
  56
  57         skb->dev = dev;
  58         skb_put(skb, dev->mtu);
  59         skb->mac.raw = skb->data;
  60         pkt_len = (*lp->read)(lp->fd, &skb, lp);
  61
  62         if (pkt_len > 0) {
  63                 skb_trim(skb, pkt_len);
  64                 skb->protocol = (*lp->protocol)(skb);
  65                 netif_rx(skb);
  66
  67                 lp->stats.rx_bytes += skb->len;
  68                 lp->stats.rx_packets++;
  69                 return pkt_len;
  70         }
  71
  72         kfree_skb(skb);
  73         return pkt_len;
  74 }
  75
  76 static void uml_dev_close(void* dev)
  77 {
  78         dev_close( (struct net_device *) dev);
  79 }
  80
  81 irqreturn_t uml_net_interrupt(int irq, void *dev_id, struct pt_regs *regs)
  82 {
  83         struct net_device *dev = dev_id;
  84         struct uml_net_private *lp = dev->priv;
  85         int err;
  86
  87         if(!netif_running(dev))
  88                 return(IRQ_NONE);
  89
  90         spin_lock(&lp->lock);
  91         while((err = uml_net_rx(dev)) > 0) ;
  92         if(err < 0) {
  93                 DECLARE_WORK(close_work, uml_dev_close, dev);
  94                 printk(KERN_ERR
  95                        "Device '%s' read returned %d, shutting it down\n",
  96                        dev->name, err);
  97                 /* dev_close can't be called in interrupt context, and takes
  98                  * again lp->lock.
  99                  * And dev_close() can be safely called multiple times on the
 100                  * same device, since it tests for (dev->flags & IFF_UP). So
 101                  * there's no harm in delaying the device shutdown. */
 102                 schedule_work(&close_work);
 103                 goto out;
 104         }
 105         reactivate_fd(lp->fd, UM_ETH_IRQ);
 106
 107 out:
 108         spin_unlock(&lp->lock);
 109         return(IRQ_HANDLED);
 110 }
 111
 112 static int uml_net_open(struct net_device *dev)
 113 {
 114         struct uml_net_private *lp = dev->priv;
 115         int err;
 116
 117         spin_lock(&lp->lock);
 118
 119         if(lp->fd >= 0){
 120                 err = -ENXIO;
 121                 goto out;
 122         }
 123
 124         if(!lp->have_mac){
 125                 dev_ip_addr(dev, &lp->mac[2]);
 126                 set_ether_mac(dev, lp->mac);
 127         }
 128
 129         lp->fd = (*lp->open)(&lp->user);
 130         if(lp->fd < 0){
 131                 err = lp->fd;
 132                 goto out;
 133         }
 134
 135         err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
 136                              IRQF_DISABLED | IRQF_SHARED, dev->name, dev);
 137         if(err != 0){
 138                 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
 139                 err = -ENETUNREACH;
 140                 goto out_close;
 141         }
 142
 143         lp->tl.data = (unsigned long) &lp->user;
 144         netif_start_queue(dev);
 145
 146         /* clear buffer - it can happen that the host side of the interface
 147          * is full when we get here.  In this case, new data is never queued,
 148          * SIGIOs never arrive, and the net never works.
 149          */
 150         while((err = uml_net_rx(dev)) > 0) ;
 151
 152         spin_unlock(&lp->lock);
 153
 154         spin_lock(&opened_lock);
 155         list_add(&lp->list, &opened);
 156         spin_unlock(&opened_lock);
 157
 158         return 0;
 159 out_close:
 160         if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 161         lp->fd = -1;
 162 out:
 163         spin_unlock(&lp->lock);
 164         return err;
 165 }
 166
 167 static int uml_net_close(struct net_device *dev)
 168 {
 169         struct uml_net_private *lp = dev->priv;
 170
 171         netif_stop_queue(dev);
 172         spin_lock(&lp->lock);
 173
 174         free_irq(dev->irq, dev);
 175         if(lp->close != NULL)
 176                 (*lp->close)(lp->fd, &lp->user);
 177         lp->fd = -1;
 178
 179         spin_unlock(&lp->lock);
 180
 181         spin_lock(&opened_lock);
 182         list_del(&lp->list);
 183         spin_unlock(&opened_lock);
 184
 185         return 0;
 186 }
 187
 188 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
 189 {
 190         struct uml_net_private *lp = dev->priv;
 191         unsigned long flags;
 192         int len;
 193
 194         netif_stop_queue(dev);
 195
 196         spin_lock_irqsave(&lp->lock, flags);
 197
 198         len = (*lp->write)(lp->fd, &skb, lp);
 199
 200         if(len == skb->len) {
 201                 lp->stats.tx_packets++;
 202                 lp->stats.tx_bytes += skb->len;
 203                 dev->trans_start = jiffies;
 204                 netif_start_queue(dev);
 205
 206                 /* this is normally done in the interrupt when tx finishes */
 207                 netif_wake_queue(dev);
 208         }
 209         else if(len == 0){
 210                 netif_start_queue(dev);
 211                 lp->stats.tx_dropped++;
 212         }
 213         else {
 214                 netif_start_queue(dev);
 215                 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
 216         }
 217
 218         spin_unlock_irqrestore(&lp->lock, flags);
 219
 220         dev_kfree_skb(skb);
 221
 222         return 0;
 223 }
 224
 225 static struct net_device_stats *uml_net_get_stats(struct net_device *dev)
 226 {
 227         struct uml_net_private *lp = dev->priv;
 228         return &lp->stats;
 229 }
 230
 231 static void uml_net_set_multicast_list(struct net_device *dev)
 232 {
 233         if (dev->flags & IFF_PROMISC) return;
 234         else if (dev->mc_count) dev->flags |= IFF_ALLMULTI;
 235         else dev->flags &= ~IFF_ALLMULTI;
 236 }
 237
 238 static void uml_net_tx_timeout(struct net_device *dev)
 239 {
 240         dev->trans_start = jiffies;
 241         netif_wake_queue(dev);
 242 }
 243
 244 static int uml_net_set_mac(struct net_device *dev, void *addr)
 245 {
 246         struct uml_net_private *lp = dev->priv;
 247         struct sockaddr *hwaddr = addr;
 248
 249         spin_lock(&lp->lock);
 250         set_ether_mac(dev, hwaddr->sa_data);
 251         spin_unlock(&lp->lock);
 252
 253         return(0);
 254 }
 255
 256 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
 257 {
 258         struct uml_net_private *lp = dev->priv;
 259         int err = 0;
 260
 261         spin_lock(&lp->lock);
 262
 263         new_mtu = (*lp->set_mtu)(new_mtu, &lp->user);
 264         if(new_mtu < 0){
 265                 err = new_mtu;
 266                 goto out;
 267         }
 268
 269         dev->mtu = new_mtu;
 270
 271  out:
 272         spin_unlock(&lp->lock);
 273         return err;
 274 }
 275
 276 static void uml_net_get_drvinfo(struct net_device *dev,
 277                                 struct ethtool_drvinfo *info)
 278 {
 279         strcpy(info->driver, DRIVER_NAME);
 280         strcpy(info->version, "42");
 281 }
 282
 283 static struct ethtool_ops uml_net_ethtool_ops = {
 284         .get_drvinfo    = uml_net_get_drvinfo,
 285         .get_link       = ethtool_op_get_link,
 286 };
 287
 288 void uml_net_user_timer_expire(unsigned long _conn)
 289 {
 290 #ifdef undef
 291         struct connection *conn = (struct connection *)_conn;
 292
 293         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
 294         do_connect(conn);
 295 #endif
 296 }
 297
 298 static DEFINE_SPINLOCK(devices_lock);
 299 static LIST_HEAD(devices);
 300
 301 static struct platform_driver uml_net_driver = {
 302         .driver = {
 303                 .name  = DRIVER_NAME,
 304         },
 305 };
 306 static int driver_registered;
 307
 308 static int eth_configure(int n, void *init, char *mac,
 309                          struct transport *transport)
 310 {
 311         struct uml_net *device;
 312         struct net_device *dev;
 313         struct uml_net_private *lp;
 314         int save, err, size;
 315
 316         size = transport->private_size + sizeof(struct uml_net_private) +
 317                 sizeof(((struct uml_net_private *) 0)->user);
 318
 319         device = kmalloc(sizeof(*device), GFP_KERNEL);
 320         if (device == NULL) {
 321                 printk(KERN_ERR "eth_configure failed to allocate uml_net\n");
 322                 return(1);
 323         }
 324
 325         memset(device, 0, sizeof(*device));
 326         INIT_LIST_HEAD(&device->list);
 327         device->index = n;
 328
 329         spin_lock(&devices_lock);
 330         list_add(&device->list, &devices);
 331         spin_unlock(&devices_lock);
 332
 333         if (setup_etheraddr(mac, device->mac))
 334                 device->have_mac = 1;
 335
 336         printk(KERN_INFO "Netdevice %d ", n);
 337         if (device->have_mac)
 338                 printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
 339                        device->mac[0], device->mac[1],
 340                        device->mac[2], device->mac[3],
 341                        device->mac[4], device->mac[5]);
 342         printk(": ");
 343         dev = alloc_etherdev(size);
 344         if (dev == NULL) {
 345                 printk(KERN_ERR "eth_configure: failed to allocate device\n");
 346                 return 1;
 347         }
 348
 349         lp = dev->priv;
 350         /* This points to the transport private data. It's still clear, but we
 351          * must memset it to 0 *now*. Let's help the drivers. */
 352         memset(lp, 0, size);
 353
 354         /* sysfs register */
 355         if (!driver_registered) {
 356                 platform_driver_register(&uml_net_driver);
 357                 driver_registered = 1;
 358         }
 359         device->pdev.id = n;
 360         device->pdev.name = DRIVER_NAME;
 361         platform_device_register(&device->pdev);
 362         SET_NETDEV_DEV(dev,&device->pdev.dev);
 363
 364         /* If this name ends up conflicting with an existing registered
 365          * netdevice, that is OK, register_netdev{,ice}() will notice this
 366          * and fail.
 367          */
 368         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
 369         device->dev = dev;
 370
 371         (*transport->kern->init)(dev, init);
 372
 373         dev->mtu = transport->user->max_packet;
 374         dev->open = uml_net_open;
 375         dev->hard_start_xmit = uml_net_start_xmit;
 376         dev->stop = uml_net_close;
 377         dev->get_stats = uml_net_get_stats;
 378         dev->set_multicast_list = uml_net_set_multicast_list;
 379         dev->tx_timeout = uml_net_tx_timeout;
 380         dev->set_mac_address = uml_net_set_mac;
 381         dev->change_mtu = uml_net_change_mtu;
 382         dev->ethtool_ops = &uml_net_ethtool_ops;
 383         dev->watchdog_timeo = (HZ >> 1);
 384         dev->irq = UM_ETH_IRQ;
 385
 386         rtnl_lock();
 387         err = register_netdevice(dev);
 388         rtnl_unlock();
 389         if (err) {
 390                 device->dev = NULL;
 391                 /* XXX: should we call ->remove() here? */
 392                 free_netdev(dev);
 393                 return 1;
 394         }
 395
 396         /* lp.user is the first four bytes of the transport data, which
 397          * has already been initialized.  This structure assignment will
 398          * overwrite that, so we make sure that .user gets overwritten with
 399          * what it already has.
 400          */
 401         save = lp->user[0];
 402         *lp = ((struct uml_net_private)
 403                 { .list                 = LIST_HEAD_INIT(lp->list),
 404                   .dev                  = dev,
 405                   .fd                   = -1,
 406                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
 407                   .have_mac             = device->have_mac,
 408                   .protocol             = transport->kern->protocol,
 409                   .open                 = transport->user->open,
 410                   .close                = transport->user->close,
 411                   .remove               = transport->user->remove,
 412                   .read                 = transport->kern->read,
 413                   .write                = transport->kern->write,
 414                   .add_address          = transport->user->add_address,
 415                   .delete_address       = transport->user->delete_address,
 416                   .set_mtu              = transport->user->set_mtu,
 417                   .user                 = { save } });
 418
 419         init_timer(&lp->tl);
 420         spin_lock_init(&lp->lock);
 421         lp->tl.function = uml_net_user_timer_expire;
 422         if (lp->have_mac)
 423                 memcpy(lp->mac, device->mac, sizeof(lp->mac));
 424
 425         if (transport->user->init)
 426                 (*transport->user->init)(&lp->user, dev);
 427
 428         if (device->have_mac)
 429                 set_ether_mac(dev, device->mac);
 430
 431         return 0;
 432 }
 433
 434 static struct uml_net *find_device(int n)
 435 {
 436         struct uml_net *device;
 437         struct list_head *ele;
 438
 439         spin_lock(&devices_lock);
 440         list_for_each(ele, &devices){
 441                 device = list_entry(ele, struct uml_net, list);
 442                 if(device->index == n)
 443                         goto out;
 444         }
 445         device = NULL;
 446  out:
 447         spin_unlock(&devices_lock);
 448         return(device);
 449 }
 450
 451 static int eth_parse(char *str, int *index_out, char **str_out)
 452 {
 453         char *end;
 454         int n;
 455
 456         n = simple_strtoul(str, &end, 0);
 457         if(end == str){
 458                 printk(KERN_ERR "eth_setup: Failed to parse '%s'\n", str);
 459                 return(1);
 460         }
 461         if(n < 0){
 462                 printk(KERN_ERR "eth_setup: device %d is negative\n", n);
 463                 return(1);
 464         }
 465         str = end;
 466         if(*str != '='){
 467                 printk(KERN_ERR
 468                        "eth_setup: expected '=' after device number\n");
 469                 return(1);
 470         }
 471         str++;
 472         if(find_device(n)){
 473                 printk(KERN_ERR "eth_setup: Device %d already configured\n",
 474                        n);
 475                 return(1);
 476         }
 477         if(index_out) *index_out = n;
 478         *str_out = str;
 479         return(0);
 480 }
 481
 482 struct eth_init {
 483         struct list_head list;
 484         char *init;
 485         int index;
 486 };
 487
 488 /* Filled in at boot time.  Will need locking if the transports become
 489  * modular.
 490  */
 491 struct list_head transports = LIST_HEAD_INIT(transports);
 492
 493 /* Filled in during early boot */
 494 struct list_head eth_cmd_line = LIST_HEAD_INIT(eth_cmd_line);
 495
 496 static int check_transport(struct transport *transport, char *eth, int n,
 497                            void **init_out, char **mac_out)
 498 {
 499         int len;
 500
 501         len = strlen(transport->name);
 502         if(strncmp(eth, transport->name, len))
 503                 return(0);
 504
 505         eth += len;
 506         if(*eth == ',')
 507                 eth++;
 508         else if(*eth != '\0')
 509                 return(0);
 510
 511         *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
 512         if(*init_out == NULL)
 513                 return(1);
 514
 515         if(!transport->setup(eth, mac_out, *init_out)){
 516                 kfree(*init_out);
 517                 *init_out = NULL;
 518         }
 519         return(1);
 520 }
 521
 522 void register_transport(struct transport *new)
 523 {
 524         struct list_head *ele, *next;
 525         struct eth_init *eth;
 526         void *init;
 527         char *mac = NULL;
 528         int match;
 529
 530         list_add(&new->list, &transports);
 531
 532         list_for_each_safe(ele, next, &eth_cmd_line){
 533                 eth = list_entry(ele, struct eth_init, list);
 534                 match = check_transport(new, eth->init, eth->index, &init,
 535                                         &mac);
 536                 if(!match)
 537                         continue;
 538                 else if(init != NULL){
 539                         eth_configure(eth->index, init, mac, new);
 540                         kfree(init);
 541                 }
 542                 list_del(&eth->list);
 543         }
 544 }
 545
 546 static int eth_setup_common(char *str, int index)
 547 {
 548         struct list_head *ele;
 549         struct transport *transport;
 550         void *init;
 551         char *mac = NULL;
 552
 553         list_for_each(ele, &transports){
 554                 transport = list_entry(ele, struct transport, list);
 555                 if(!check_transport(transport, str, index, &init, &mac))
 556                         continue;
 557                 if(init != NULL){
 558                         eth_configure(index, init, mac, transport);
 559                         kfree(init);
 560                 }
 561                 return(1);
 562         }
 563         return(0);
 564 }
 565
 566 static int eth_setup(char *str)
 567 {
 568         struct eth_init *new;
 569         int n, err;
 570
 571         err = eth_parse(str, &n, &str);
 572         if(err) return(1);
 573
 574         new = alloc_bootmem(sizeof(new));
 575         if (new == NULL){
 576                 printk("eth_init : alloc_bootmem failed\n");
 577                 return(1);
 578         }
 579
 580         INIT_LIST_HEAD(&new->list);
 581         new->index = n;
 582         new->init = str;
 583
 584         list_add_tail(&new->list, &eth_cmd_line);
 585         return(1);
 586 }
 587
 588 __setup("eth", eth_setup);
 589 __uml_help(eth_setup,
 590 "eth[0-9]+=<transport>,<options>\n"
 591 "    Configure a network device.\n\n"
 592 );
 593
 594 #if 0
 595 static int eth_init(void)
 596 {
 597         struct list_head *ele, *next;
 598         struct eth_init *eth;
 599
 600         list_for_each_safe(ele, next, &eth_cmd_line){
 601                 eth = list_entry(ele, struct eth_init, list);
 602
 603                 if(eth_setup_common(eth->init, eth->index))
 604                         list_del(&eth->list);
 605         }
 606
 607         return(1);
 608 }
 609 __initcall(eth_init);
 610 #endif
 611
 612 static int net_config(char *str)
 613 {
 614         int n, err;
 615
 616         err = eth_parse(str, &n, &str);
 617         if(err) return(err);
 618
 619         str = kstrdup(str, GFP_KERNEL);
 620         if(str == NULL){
 621                 printk(KERN_ERR "net_config failed to strdup string\n");
 622                 return(-1);
 623         }
 624         err = !eth_setup_common(str, n);
 625         if(err)
 626                 kfree(str);
 627         return(err);
 628 }
 629
 630 static int net_id(char **str, int *start_out, int *end_out)
 631 {
 632         char *end;
 633         int n;
 634
 635         n = simple_strtoul(*str, &end, 0);
 636         if((*end != '\0') || (end == *str))
 637                 return -1;
 638
 639         *start_out = n;
 640         *end_out = n;
 641         *str = end;
 642         return n;
 643 }
 644
 645 static int net_remove(int n)
 646 {
 647         struct uml_net *device;
 648         struct net_device *dev;
 649         struct uml_net_private *lp;
 650
 651         device = find_device(n);
 652         if(device == NULL)
 653                 return -ENODEV;
 654
 655         dev = device->dev;
 656         lp = dev->priv;
 657         if(lp->fd > 0)
 658                 return -EBUSY;
 659         if(lp->remove != NULL) (*lp->remove)(&lp->user);
 660         unregister_netdev(dev);
 661         platform_device_unregister(&device->pdev);
 662
 663         list_del(&device->list);
 664         kfree(device);
 665         free_netdev(dev);
 666         return 0;
 667 }
 668
 669 static struct mc_device net_mc = {
 670         .name           = "eth",
 671         .config         = net_config,
 672         .get_config     = NULL,
 673         .id             = net_id,
 674         .remove         = net_remove,
 675 };
 676
 677 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 678                               void *ptr)
 679 {
 680         struct in_ifaddr *ifa = ptr;
 681         struct net_device *dev = ifa->ifa_dev->dev;
 682         struct uml_net_private *lp;
 683         void (*proc)(unsigned char *, unsigned char *, void *);
 684         unsigned char addr_buf[4], netmask_buf[4];
 685
 686         if(dev->open != uml_net_open) return(NOTIFY_DONE);
 687
 688         lp = dev->priv;
 689
 690         proc = NULL;
 691         switch (event){
 692         case NETDEV_UP:
 693                 proc = lp->add_address;
 694                 break;
 695         case NETDEV_DOWN:
 696                 proc = lp->delete_address;
 697                 break;
 698         }
 699         if(proc != NULL){
 700                 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
 701                 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
 702                 (*proc)(addr_buf, netmask_buf, &lp->user);
 703         }
 704         return(NOTIFY_DONE);
 705 }
 706
 707 struct notifier_block uml_inetaddr_notifier = {
 708         .notifier_call          = uml_inetaddr_event,
 709 };
 710
 711 static int uml_net_init(void)
 712 {
 713         struct list_head *ele;
 714         struct uml_net_private *lp;
 715         struct in_device *ip;
 716         struct in_ifaddr *in;
 717
 718         mconsole_register_dev(&net_mc);
 719         register_inetaddr_notifier(&uml_inetaddr_notifier);
 720
 721         /* Devices may have been opened already, so the uml_inetaddr_notifier
 722          * didn't get a chance to run for them.  This fakes it so that
 723          * addresses which have already been set up get handled properly.
 724          */
 725         list_for_each(ele, &opened){
 726                 lp = list_entry(ele, struct uml_net_private, list);
 727                 ip = lp->dev->ip_ptr;
 728                 if(ip == NULL) continue;
 729                 in = ip->ifa_list;
 730                 while(in != NULL){
 731                         uml_inetaddr_event(NULL, NETDEV_UP, in);
 732                         in = in->ifa_next;
 733                 }
 734         }
 735
 736         return(0);
 737 }
 738
 739 __initcall(uml_net_init);
 740
 741 static void close_devices(void)
 742 {
 743         struct list_head *ele;
 744         struct uml_net_private *lp;
 745
 746         list_for_each(ele, &opened){
 747                 lp = list_entry(ele, struct uml_net_private, list);
 748                 free_irq(lp->dev->irq, lp->dev);
 749                 if((lp->close != NULL) && (lp->fd >= 0))
 750                         (*lp->close)(lp->fd, &lp->user);
 751                 if(lp->remove != NULL) (*lp->remove)(&lp->user);
 752         }
 753 }
 754
 755 __uml_exitcall(close_devices);
 756
 757 int setup_etheraddr(char *str, unsigned char *addr)
 758 {
 759         char *end;
 760         int i;
 761
 762         if(str == NULL)
 763                 return(0);
 764         for(i=0;i<6;i++){
 765                 addr[i] = simple_strtoul(str, &end, 16);
 766                 if((end == str) ||
 767                    ((*end != ':') && (*end != ',') && (*end != '\0'))){
 768                         printk(KERN_ERR
 769                                "setup_etheraddr: failed to parse '%s' "
 770                                "as an ethernet address\n", str);
 771                         return(0);
 772                 }
 773                 str = end + 1;
 774         }
 775         if(addr[0] & 1){
 776                 printk(KERN_ERR
 777                        "Attempt to assign a broadcast ethernet address to a "
 778                        "device disallowed\n");
 779                 return(0);
 780         }
 781         return(1);
 782 }
 783
 784 void dev_ip_addr(void *d, unsigned char *bin_buf)
 785 {
 786         struct net_device *dev = d;
 787         struct in_device *ip = dev->ip_ptr;
 788         struct in_ifaddr *in;
 789
 790         if((ip == NULL) || ((in = ip->ifa_list) == NULL)){
 791                 printk(KERN_WARNING "dev_ip_addr - device not assigned an "
 792                        "IP address\n");
 793                 return;
 794         }
 795         memcpy(bin_buf, &in->ifa_address, sizeof(in->ifa_address));
 796 }
 797
 798 struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
 799 {
 800         if((skb != NULL) && (skb_tailroom(skb) < extra)){
 801                 struct sk_buff *skb2;
 802
 803                 skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
 804                 dev_kfree_skb(skb);
 805                 skb = skb2;
 806         }
 807         if(skb != NULL) skb_put(skb, extra);
 808         return(skb);
 809 }
 810
 811 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 812                                         void *),
 813                     void *arg)
 814 {
 815         struct net_device *dev = d;
 816         struct in_device *ip = dev->ip_ptr;
 817         struct in_ifaddr *in;
 818         unsigned char address[4], netmask[4];
 819
 820         if(ip == NULL) return;
 821         in = ip->ifa_list;
 822         while(in != NULL){
 823                 memcpy(address, &in->ifa_address, sizeof(address));
 824                 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
 825                 (*cb)(address, netmask, arg);
 826                 in = in->ifa_next;
 827         }
 828 }
 829
 830 int dev_netmask(void *d, void *m)
 831 {
 832         struct net_device *dev = d;
 833         struct in_device *ip = dev->ip_ptr;
 834         struct in_ifaddr *in;
 835         __u32 *mask_out = m;
 836
 837         if(ip == NULL)
 838                 return(1);
 839
 840         in = ip->ifa_list;
 841         if(in == NULL)
 842                 return(1);
 843
 844         *mask_out = in->ifa_mask;
 845         return(0);
 846 }
 847
 848 void *get_output_buffer(int *len_out)
 849 {
 850         void *ret;
 851
 852         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 853         if(ret) *len_out = PAGE_SIZE;
 854         else *len_out = 0;
 855         return(ret);
 856 }
 857
 858 void free_output_buffer(void *buffer)
 859 {
 860         free_pages((unsigned long) buffer, 0);
 861 }
 862
 863 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 864                      char **gate_addr)
 865 {
 866         char *remain;
 867
 868         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 869         if(remain != NULL){
 870                 printk("tap_setup_common - Extra garbage on specification : "
 871                        "'%s'\n", remain);
 872                 return(1);
 873         }
 874
 875         return(0);
 876 }
 877
 878 unsigned short eth_protocol(struct sk_buff *skb)
 879 {
 880         return(eth_type_trans(skb, skb->dev));
 881 }
 882
 883 /*
 884  * Overrides for Emacs so that we follow Linus's tabbing style.
 885  * Emacs will notice this stuff at the end of the file and automatically
 886  * adjust the settings for this buffer only.  This must remain at the end
 887  * of the file.
 888  * ---------------------------------------------------------------------------
 889  * Local variables:
 890  * c-file-style: "linux"
 891  * End:
 892  */