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