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 "user_util.h"
  23 #include "kern_util.h"
  24 #include "net_kern.h"
  25 #include "net_user.h"
  26 #include "mconsole_kern.h"
  27 #include "init.h"
  28 #include "irq_user.h"
  29 #include "irq_kern.h"
  30
  31 static spinlock_t opened_lock = SPIN_LOCK_UNLOCKED;
  32 LIST_HEAD(opened);
  33
  34 static int uml_net_rx(struct net_device *dev)
  35 {
  36         struct uml_net_private *lp = dev->priv;
  37         int pkt_len;
  38         struct sk_buff *skb;
  39
  40         /* If we can't allocate memory, try again next round. */
  41         skb = dev_alloc_skb(dev->mtu);
  42         if (skb == NULL) {
  43                 lp->stats.rx_dropped++;
  44                 return 0;
  45         }
  46
  47         skb->dev = dev;
  48         skb_put(skb, dev->mtu);
  49         skb->mac.raw = skb->data;
  50         pkt_len = (*lp->read)(lp->fd, &skb, lp);
  51
  52         if (pkt_len > 0) {
  53                 skb_trim(skb, pkt_len);
  54                 skb->protocol = (*lp->protocol)(skb);
  55                 netif_rx(skb);
  56
  57                 lp->stats.rx_bytes += skb->len;
  58                 lp->stats.rx_packets++;
  59                 return pkt_len;
  60         }
  61
  62         kfree_skb(skb);
  63         return pkt_len;
  64 }
  65
  66 irqreturn_t uml_net_interrupt(int irq, void *dev_id, struct pt_regs *regs)
  67 {
  68         struct net_device *dev = dev_id;
  69         struct uml_net_private *lp = dev->priv;
  70         int err;
  71
  72         if(!netif_running(dev))
  73                 return(IRQ_NONE);
  74
  75         spin_lock(&lp->lock);
  76         while((err = uml_net_rx(dev)) > 0) ;
  77         if(err < 0) {
  78                 printk(KERN_ERR
  79                        "Device '%s' read returned %d, shutting it down\n",
  80                        dev->name, err);
  81                 dev_close(dev);
  82                 goto out;
  83         }
  84         reactivate_fd(lp->fd, UM_ETH_IRQ);
  85
  86  out:
  87         spin_unlock(&lp->lock);
  88         return(IRQ_HANDLED);
  89 }
  90
  91 static int uml_net_open(struct net_device *dev)
  92 {
  93         struct uml_net_private *lp = dev->priv;
  94         char addr[sizeof("255.255.255.255\0")];
  95         int err;
  96
  97         spin_lock(&lp->lock);
  98
  99         if(lp->fd >= 0){
 100                 err = -ENXIO;
 101                 goto out;
 102         }
 103
 104         if(!lp->have_mac){
 105                 dev_ip_addr(dev, addr, &lp->mac[2]);
 106                 set_ether_mac(dev, lp->mac);
 107         }
 108
 109         lp->fd = (*lp->open)(&lp->user);
 110         if(lp->fd < 0){
 111                 err = lp->fd;
 112                 goto out;
 113         }
 114
 115         err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
 116                              SA_INTERRUPT | SA_SHIRQ, dev->name, dev);
 117         if(err != 0){
 118                 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
 119                 if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 120                 lp->fd = -1;
 121                 err = -ENETUNREACH;
 122         }
 123
 124         lp->tl.data = (unsigned long) &lp->user;
 125         netif_start_queue(dev);
 126
 127         spin_lock(&opened_lock);
 128         list_add(&lp->list, &opened);
 129         spin_unlock(&opened_lock);
 130  out:
 131         spin_unlock(&lp->lock);
 132         return(err);
 133 }
 134
 135 static int uml_net_close(struct net_device *dev)
 136 {
 137         struct uml_net_private *lp = dev->priv;
 138
 139         netif_stop_queue(dev);
 140         spin_lock(&lp->lock);
 141
 142         free_irq(dev->irq, dev);
 143         if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 144         lp->fd = -1;
 145         spin_lock(&opened_lock);
 146         list_del(&lp->list);
 147         spin_unlock(&opened_lock);
 148
 149         spin_unlock(&lp->lock);
 150         return 0;
 151 }
 152
 153 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
 154 {
 155         struct uml_net_private *lp = dev->priv;
 156         unsigned long flags;
 157         int len;
 158
 159         netif_stop_queue(dev);
 160
 161         spin_lock_irqsave(&lp->lock, flags);
 162
 163         len = (*lp->write)(lp->fd, &skb, lp);
 164
 165         if(len == skb->len) {
 166                 lp->stats.tx_packets++;
 167                 lp->stats.tx_bytes += skb->len;
 168                 dev->trans_start = jiffies;
 169                 netif_start_queue(dev);
 170
 171                 /* this is normally done in the interrupt when tx finishes */
 172                 netif_wake_queue(dev);
 173         }
 174         else if(len == 0){
 175                 netif_start_queue(dev);
 176                 lp->stats.tx_dropped++;
 177         }
 178         else {
 179                 netif_start_queue(dev);
 180                 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
 181         }
 182
 183         spin_unlock_irqrestore(&lp->lock, flags);
 184
 185         dev_kfree_skb(skb);
 186
 187         return 0;
 188 }
 189
 190 static struct net_device_stats *uml_net_get_stats(struct net_device *dev)
 191 {
 192         struct uml_net_private *lp = dev->priv;
 193         return &lp->stats;
 194 }
 195
 196 static void uml_net_set_multicast_list(struct net_device *dev)
 197 {
 198         if (dev->flags & IFF_PROMISC) return;
 199         else if (dev->mc_count) dev->flags |= IFF_ALLMULTI;
 200         else dev->flags &= ~IFF_ALLMULTI;
 201 }
 202
 203 static void uml_net_tx_timeout(struct net_device *dev)
 204 {
 205         dev->trans_start = jiffies;
 206         netif_wake_queue(dev);
 207 }
 208
 209 static int uml_net_set_mac(struct net_device *dev, void *addr)
 210 {
 211         struct uml_net_private *lp = dev->priv;
 212         struct sockaddr *hwaddr = addr;
 213
 214         spin_lock(&lp->lock);
 215         memcpy(dev->dev_addr, hwaddr->sa_data, ETH_ALEN);
 216         spin_unlock(&lp->lock);
 217
 218         return(0);
 219 }
 220
 221 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
 222 {
 223         struct uml_net_private *lp = dev->priv;
 224         int err = 0;
 225
 226         spin_lock(&lp->lock);
 227
 228         new_mtu = (*lp->set_mtu)(new_mtu, &lp->user);
 229         if(new_mtu < 0){
 230                 err = new_mtu;
 231                 goto out;
 232         }
 233
 234         dev->mtu = new_mtu;
 235
 236  out:
 237         spin_unlock(&lp->lock);
 238         return err;
 239 }
 240
 241 static int uml_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 242 {
 243         return(-EINVAL);
 244 }
 245
 246 void uml_net_user_timer_expire(unsigned long _conn)
 247 {
 248 #ifdef undef
 249         struct connection *conn = (struct connection *)_conn;
 250
 251         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
 252         do_connect(conn);
 253 #endif
 254 }
 255
 256 static spinlock_t devices_lock = SPIN_LOCK_UNLOCKED;
 257 static struct list_head devices = LIST_HEAD_INIT(devices);
 258
 259 static int eth_configure(int n, void *init, char *mac,
 260                          struct transport *transport)
 261 {
 262         struct uml_net *device;
 263         struct net_device *dev;
 264         struct uml_net_private *lp;
 265         int save, err, size;
 266
 267         size = transport->private_size + sizeof(struct uml_net_private) +
 268                 sizeof(((struct uml_net_private *) 0)->user);
 269
 270         device = kmalloc(sizeof(*device), GFP_KERNEL);
 271         if (device == NULL) {
 272                 printk(KERN_ERR "eth_configure failed to allocate uml_net\n");
 273                 return(1);
 274         }
 275
 276         memset(device, 0, sizeof(*device));
 277         INIT_LIST_HEAD(&device->list);
 278         device->index = n;
 279
 280         spin_lock(&devices_lock);
 281         list_add(&device->list, &devices);
 282         spin_unlock(&devices_lock);
 283
 284         if (setup_etheraddr(mac, device->mac))
 285                 device->have_mac = 1;
 286
 287         printk(KERN_INFO "Netdevice %d ", n);
 288         if (device->have_mac)
 289                 printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
 290                        device->mac[0], device->mac[1],
 291                        device->mac[2], device->mac[3],
 292                        device->mac[4], device->mac[5]);
 293         printk(": ");
 294         dev = alloc_etherdev(size);
 295         if (dev == NULL) {
 296                 printk(KERN_ERR "eth_configure: failed to allocate device\n");
 297                 return 1;
 298         }
 299
 300         /* If this name ends up conflicting with an existing registered
 301          * netdevice, that is OK, register_netdev{,ice}() will notice this
 302          * and fail.
 303          */
 304         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
 305         device->dev = dev;
 306
 307         (*transport->kern->init)(dev, init);
 308
 309         dev->mtu = transport->user->max_packet;
 310         dev->open = uml_net_open;
 311         dev->hard_start_xmit = uml_net_start_xmit;
 312         dev->stop = uml_net_close;
 313         dev->get_stats = uml_net_get_stats;
 314         dev->set_multicast_list = uml_net_set_multicast_list;
 315         dev->tx_timeout = uml_net_tx_timeout;
 316         dev->set_mac_address = uml_net_set_mac;
 317         dev->change_mtu = uml_net_change_mtu;
 318         dev->do_ioctl = uml_net_ioctl;
 319         dev->watchdog_timeo = (HZ >> 1);
 320         dev->irq = UM_ETH_IRQ;
 321
 322         rtnl_lock();
 323         err = register_netdevice(dev);
 324         rtnl_unlock();
 325         if (err) {
 326                 device->dev = NULL;
 327                 /* XXX: should we call ->remove() here? */
 328                 free_netdev(dev);
 329                 return 1;
 330         }
 331         lp = dev->priv;
 332
 333         /* lp.user is the first four bytes of the transport data, which
 334          * has already been initialized.  This structure assignment will
 335          * overwrite that, so we make sure that .user gets overwritten with
 336          * what it already has.
 337          */
 338         save = lp->user[0];
 339         *lp = ((struct uml_net_private)
 340                 { .list                 = LIST_HEAD_INIT(lp->list),
 341                   .lock                 = SPIN_LOCK_UNLOCKED,
 342                   .dev                  = dev,
 343                   .fd                   = -1,
 344                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
 345                   .have_mac             = device->have_mac,
 346                   .protocol             = transport->kern->protocol,
 347                   .open                 = transport->user->open,
 348                   .close                = transport->user->close,
 349                   .remove               = transport->user->remove,
 350                   .read                 = transport->kern->read,
 351                   .write                = transport->kern->write,
 352                   .add_address          = transport->user->add_address,
 353                   .delete_address       = transport->user->delete_address,
 354                   .set_mtu              = transport->user->set_mtu,
 355                   .user                 = { save } });
 356
 357         init_timer(&lp->tl);
 358         lp->tl.function = uml_net_user_timer_expire;
 359         if (lp->have_mac)
 360                 memcpy(lp->mac, device->mac, sizeof(lp->mac));
 361
 362         if (transport->user->init)
 363                 (*transport->user->init)(&lp->user, dev);
 364
 365         if (device->have_mac)
 366                 set_ether_mac(dev, device->mac);
 367         return(0);
 368 }
 369
 370 static struct uml_net *find_device(int n)
 371 {
 372         struct uml_net *device;
 373         struct list_head *ele;
 374
 375         spin_lock(&devices_lock);
 376         list_for_each(ele, &devices){
 377                 device = list_entry(ele, struct uml_net, list);
 378                 if(device->index == n)
 379                         goto out;
 380         }
 381         device = NULL;
 382  out:
 383         spin_unlock(&devices_lock);
 384         return(device);
 385 }
 386
 387 static int eth_parse(char *str, int *index_out, char **str_out)
 388 {
 389         char *end;
 390         int n;
 391
 392         n = simple_strtoul(str, &end, 0);
 393         if(end == str){
 394                 printk(KERN_ERR "eth_setup: Failed to parse '%s'\n", str);
 395                 return(1);
 396         }
 397         if(n < 0){
 398                 printk(KERN_ERR "eth_setup: device %d is negative\n", n);
 399                 return(1);
 400         }
 401         str = end;
 402         if(*str != '='){
 403                 printk(KERN_ERR
 404                        "eth_setup: expected '=' after device number\n");
 405                 return(1);
 406         }
 407         str++;
 408         if(find_device(n)){
 409                 printk(KERN_ERR "eth_setup: Device %d already configured\n",
 410                        n);
 411                 return(1);
 412         }
 413         if(index_out) *index_out = n;
 414         *str_out = str;
 415         return(0);
 416 }
 417
 418 struct eth_init {
 419         struct list_head list;
 420         char *init;
 421         int index;
 422 };
 423
 424 /* Filled in at boot time.  Will need locking if the transports become
 425  * modular.
 426  */
 427 struct list_head transports = LIST_HEAD_INIT(transports);
 428
 429 /* Filled in during early boot */
 430 struct list_head eth_cmd_line = LIST_HEAD_INIT(eth_cmd_line);
 431
 432 static int check_transport(struct transport *transport, char *eth, int n,
 433                            void **init_out, char **mac_out)
 434 {
 435         int len;
 436
 437         len = strlen(transport->name);
 438         if(strncmp(eth, transport->name, len))
 439                 return(0);
 440
 441         eth += len;
 442         if(*eth == ',')
 443                 eth++;
 444         else if(*eth != '\0')
 445                 return(0);
 446
 447         *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
 448         if(*init_out == NULL)
 449                 return(1);
 450
 451         if(!transport->setup(eth, mac_out, *init_out)){
 452                 kfree(*init_out);
 453                 *init_out = NULL;
 454         }
 455         return(1);
 456 }
 457
 458 void register_transport(struct transport *new)
 459 {
 460         struct list_head *ele, *next;
 461         struct eth_init *eth;
 462         void *init;
 463         char *mac = NULL;
 464         int match;
 465
 466         list_add(&new->list, &transports);
 467
 468         list_for_each_safe(ele, next, &eth_cmd_line){
 469                 eth = list_entry(ele, struct eth_init, list);
 470                 match = check_transport(new, eth->init, eth->index, &init,
 471                                         &mac);
 472                 if(!match)
 473                         continue;
 474                 else if(init != NULL){
 475                         eth_configure(eth->index, init, mac, new);
 476                         kfree(init);
 477                 }
 478                 list_del(&eth->list);
 479         }
 480 }
 481
 482 static int eth_setup_common(char *str, int index)
 483 {
 484         struct list_head *ele;
 485         struct transport *transport;
 486         void *init;
 487         char *mac = NULL;
 488
 489         list_for_each(ele, &transports){
 490                 transport = list_entry(ele, struct transport, list);
 491                 if(!check_transport(transport, str, index, &init, &mac))
 492                         continue;
 493                 if(init != NULL){
 494                         eth_configure(index, init, mac, transport);
 495                         kfree(init);
 496                 }
 497                 return(1);
 498         }
 499         return(0);
 500 }
 501
 502 static int eth_setup(char *str)
 503 {
 504         struct eth_init *new;
 505         int n, err;
 506
 507         err = eth_parse(str, &n, &str);
 508         if(err) return(1);
 509
 510         new = alloc_bootmem(sizeof(new));
 511         if (new == NULL){
 512                 printk("eth_init : alloc_bootmem failed\n");
 513                 return(1);
 514         }
 515
 516         INIT_LIST_HEAD(&new->list);
 517         new->index = n;
 518         new->init = str;
 519
 520         list_add_tail(&new->list, &eth_cmd_line);
 521         return(1);
 522 }
 523
 524 __setup("eth", eth_setup);
 525 __uml_help(eth_setup,
 526 "eth[0-9]+=<transport>,<options>\n"
 527 "    Configure a network device.\n\n"
 528 );
 529
 530 static int eth_init(void)
 531 {
 532         struct list_head *ele, *next;
 533         struct eth_init *eth;
 534
 535         list_for_each_safe(ele, next, &eth_cmd_line){
 536                 eth = list_entry(ele, struct eth_init, list);
 537
 538                 if(eth_setup_common(eth->init, eth->index))
 539                         list_del(&eth->list);
 540         }
 541
 542         return(1);
 543 }
 544
 545 __initcall(eth_init);
 546
 547 static int net_config(char *str)
 548 {
 549         int n, err;
 550
 551         err = eth_parse(str, &n, &str);
 552         if(err) return(err);
 553
 554         str = uml_strdup(str);
 555         if(str == NULL){
 556                 printk(KERN_ERR "net_config failed to strdup string\n");
 557                 return(-1);
 558         }
 559         err = !eth_setup_common(str, n);
 560         if(err)
 561                 kfree(str);
 562         return(err);
 563 }
 564
 565 static int net_remove(char *str)
 566 {
 567         struct uml_net *device;
 568         struct net_device *dev;
 569         struct uml_net_private *lp;
 570         char *end;
 571         int n;
 572
 573         n = simple_strtoul(str, &end, 0);
 574         if((*end != '\0') || (end == str))
 575                 return(-1);
 576
 577         device = find_device(n);
 578         if(device == NULL)
 579                 return(0);
 580
 581         dev = device->dev;
 582         lp = dev->priv;
 583         if(lp->fd > 0) return(-1);
 584         if(lp->remove != NULL) (*lp->remove)(&lp->user);
 585         unregister_netdev(dev);
 586
 587         list_del(&device->list);
 588         kfree(device);
 589         free_netdev(dev);
 590         return(0);
 591 }
 592
 593 static struct mc_device net_mc = {
 594         .name           = "eth",
 595         .config         = net_config,
 596         .get_config     = NULL,
 597         .remove         = net_remove,
 598 };
 599
 600 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 601                               void *ptr)
 602 {
 603         struct in_ifaddr *ifa = ptr;
 604         u32 addr = ifa->ifa_address;
 605         u32 netmask = ifa->ifa_mask;
 606         struct net_device *dev = ifa->ifa_dev->dev;
 607         struct uml_net_private *lp;
 608         void (*proc)(unsigned char *, unsigned char *, void *);
 609         unsigned char addr_buf[4], netmask_buf[4];
 610
 611         if(dev->open != uml_net_open) return(NOTIFY_DONE);
 612
 613         lp = dev->priv;
 614
 615         proc = NULL;
 616         switch (event){
 617         case NETDEV_UP:
 618                 proc = lp->add_address;
 619                 break;
 620         case NETDEV_DOWN:
 621                 proc = lp->delete_address;
 622                 break;
 623         }
 624         if(proc != NULL){
 625                 addr_buf[0] = addr & 0xff;
 626                 addr_buf[1] = (addr >> 8) & 0xff;
 627                 addr_buf[2] = (addr >> 16) & 0xff;
 628                 addr_buf[3] = addr >> 24;
 629                 netmask_buf[0] = netmask & 0xff;
 630                 netmask_buf[1] = (netmask >> 8) & 0xff;
 631                 netmask_buf[2] = (netmask >> 16) & 0xff;
 632                 netmask_buf[3] = netmask >> 24;
 633                 (*proc)(addr_buf, netmask_buf, &lp->user);
 634         }
 635         return(NOTIFY_DONE);
 636 }
 637
 638 struct notifier_block uml_inetaddr_notifier = {
 639         .notifier_call          = uml_inetaddr_event,
 640 };
 641
 642 static int uml_net_init(void)
 643 {
 644         struct list_head *ele;
 645         struct uml_net_private *lp;
 646         struct in_device *ip;
 647         struct in_ifaddr *in;
 648
 649         mconsole_register_dev(&net_mc);
 650         register_inetaddr_notifier(&uml_inetaddr_notifier);
 651
 652         /* Devices may have been opened already, so the uml_inetaddr_notifier
 653          * didn't get a chance to run for them.  This fakes it so that
 654          * addresses which have already been set up get handled properly.
 655          */
 656         list_for_each(ele, &opened){
 657                 lp = list_entry(ele, struct uml_net_private, list);
 658                 ip = lp->dev->ip_ptr;
 659                 if(ip == NULL) continue;
 660                 in = ip->ifa_list;
 661                 while(in != NULL){
 662                         uml_inetaddr_event(NULL, NETDEV_UP, in);
 663                         in = in->ifa_next;
 664                 }
 665         }
 666
 667         return(0);
 668 }
 669
 670 __initcall(uml_net_init);
 671
 672 static void close_devices(void)
 673 {
 674         struct list_head *ele;
 675         struct uml_net_private *lp;
 676
 677         list_for_each(ele, &opened){
 678                 lp = list_entry(ele, struct uml_net_private, list);
 679                 if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 680                 if(lp->remove != NULL) (*lp->remove)(&lp->user);
 681         }
 682 }
 683
 684 __uml_exitcall(close_devices);
 685
 686 int setup_etheraddr(char *str, unsigned char *addr)
 687 {
 688         char *end;
 689         int i;
 690
 691         if(str == NULL)
 692                 return(0);
 693         for(i=0;i<6;i++){
 694                 addr[i] = simple_strtoul(str, &end, 16);
 695                 if((end == str) ||
 696                    ((*end != ':') && (*end != ',') && (*end != '\0'))){
 697                         printk(KERN_ERR
 698                                "setup_etheraddr: failed to parse '%s' "
 699                                "as an ethernet address\n", str);
 700                         return(0);
 701                 }
 702                 str = end + 1;
 703         }
 704         if(addr[0] & 1){
 705                 printk(KERN_ERR
 706                        "Attempt to assign a broadcast ethernet address to a "
 707                        "device disallowed\n");
 708                 return(0);
 709         }
 710         return(1);
 711 }
 712
 713 void dev_ip_addr(void *d, char *buf, char *bin_buf)
 714 {
 715         struct net_device *dev = d;
 716         struct in_device *ip = dev->ip_ptr;
 717         struct in_ifaddr *in;
 718         u32 addr;
 719
 720         if((ip == NULL) || ((in = ip->ifa_list) == NULL)){
 721                 printk(KERN_WARNING "dev_ip_addr - device not assigned an "
 722                        "IP address\n");
 723                 return;
 724         }
 725         addr = in->ifa_address;
 726         sprintf(buf, "%d.%d.%d.%d", addr & 0xff, (addr >> 8) & 0xff,
 727                 (addr >> 16) & 0xff, addr >> 24);
 728         if(bin_buf){
 729                 bin_buf[0] = addr & 0xff;
 730                 bin_buf[1] = (addr >> 8) & 0xff;
 731                 bin_buf[2] = (addr >> 16) & 0xff;
 732                 bin_buf[3] = addr >> 24;
 733         }
 734 }
 735
 736 void set_ether_mac(void *d, unsigned char *addr)
 737 {
 738         struct net_device *dev = d;
 739
 740         memcpy(dev->dev_addr, addr, ETH_ALEN);
 741 }
 742
 743 struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
 744 {
 745         if((skb != NULL) && (skb_tailroom(skb) < extra)){
 746                 struct sk_buff *skb2;
 747
 748                 skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
 749                 dev_kfree_skb(skb);
 750                 skb = skb2;
 751         }
 752         if(skb != NULL) skb_put(skb, extra);
 753         return(skb);
 754 }
 755
 756 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 757                                         void *),
 758                     void *arg)
 759 {
 760         struct net_device *dev = d;
 761         struct in_device *ip = dev->ip_ptr;
 762         struct in_ifaddr *in;
 763         unsigned char address[4], netmask[4];
 764
 765         if(ip == NULL) return;
 766         in = ip->ifa_list;
 767         while(in != NULL){
 768                 address[0] = in->ifa_address & 0xff;
 769                 address[1] = (in->ifa_address >> 8) & 0xff;
 770                 address[2] = (in->ifa_address >> 16) & 0xff;
 771                 address[3] = in->ifa_address >> 24;
 772                 netmask[0] = in->ifa_mask & 0xff;
 773                 netmask[1] = (in->ifa_mask >> 8) & 0xff;
 774                 netmask[2] = (in->ifa_mask >> 16) & 0xff;
 775                 netmask[3] = in->ifa_mask >> 24;
 776                 (*cb)(address, netmask, arg);
 777                 in = in->ifa_next;
 778         }
 779 }
 780
 781 int dev_netmask(void *d, void *m)
 782 {
 783         struct net_device *dev = d;
 784         struct in_device *ip = dev->ip_ptr;
 785         struct in_ifaddr *in;
 786         __u32 *mask_out = m;
 787
 788         if(ip == NULL)
 789                 return(1);
 790
 791         in = ip->ifa_list;
 792         if(in == NULL)
 793                 return(1);
 794
 795         *mask_out = in->ifa_mask;
 796         return(0);
 797 }
 798
 799 void *get_output_buffer(int *len_out)
 800 {
 801         void *ret;
 802
 803         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 804         if(ret) *len_out = PAGE_SIZE;
 805         else *len_out = 0;
 806         return(ret);
 807 }
 808
 809 void free_output_buffer(void *buffer)
 810 {
 811         free_pages((unsigned long) buffer, 0);
 812 }
 813
 814 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 815                      char **gate_addr)
 816 {
 817         char *remain;
 818
 819         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 820         if(remain != NULL){
 821                 printk("tap_setup_common - Extra garbage on specification : "
 822                        "'%s'\n", remain);
 823                 return(1);
 824         }
 825
 826         return(0);
 827 }
 828
 829 unsigned short eth_protocol(struct sk_buff *skb)
 830 {
 831         return(eth_type_trans(skb, skb->dev));
 832 }
 833
 834 /*
 835  * Overrides for Emacs so that we follow Linus's tabbing style.
 836  * Emacs will notice this stuff at the end of the file and automatically
 837  * adjust the settings for this buffer only.  This must remain at the end
 838  * of the file.
 839  * ---------------------------------------------------------------------------
 840  * Local variables:
 841  * c-file-style: "linux"
 842  * End:
 843  */