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
  30 static spinlock_t opened_lock = SPIN_LOCK_UNLOCKED;
  31 LIST_HEAD(opened);
  32
  33 static int uml_net_rx(struct net_device *dev)
  34 {
  35         struct uml_net_private *lp = dev->priv;
  36         int pkt_len;
  37         struct sk_buff *skb;
  38
  39         /* If we can't allocate memory, try again next round. */
  40         if ((skb = dev_alloc_skb(dev->mtu)) == NULL) {
  41                 lp->stats.rx_dropped++;
  42                 return 0;
  43         }
  44
  45         skb->dev = dev;
  46         skb_put(skb, dev->mtu);
  47         skb->mac.raw = skb->data;
  48         pkt_len = (*lp->read)(lp->fd, &skb, lp);
  49
  50         if (pkt_len > 0) {
  51                 skb_trim(skb, pkt_len);
  52                 skb->protocol = (*lp->protocol)(skb);
  53                 netif_rx(skb);
  54
  55                 lp->stats.rx_bytes += skb->len;
  56                 lp->stats.rx_packets++;
  57                 return pkt_len;
  58         }
  59
  60         kfree_skb(skb);
  61         return pkt_len;
  62 }
  63
  64 void uml_net_interrupt(int irq, void *dev_id, struct pt_regs *regs)
  65 {
  66         struct net_device *dev = dev_id;
  67         struct uml_net_private *lp = dev->priv;
  68         int err;
  69
  70         if(!netif_running(dev))
  71                 return;
  72
  73         spin_lock(&lp->lock);
  74         while((err = uml_net_rx(dev)) > 0) ;
  75         if(err < 0) {
  76                 printk(KERN_ERR
  77                        "Device '%s' read returned %d, shutting it down\n",
  78                        dev->name, err);
  79                 dev_close(dev);
  80                 goto out;
  81         }
  82         reactivate_fd(lp->fd, UM_ETH_IRQ);
  83
  84  out:
  85         spin_unlock(&lp->lock);
  86 }
  87
  88 static int uml_net_open(struct net_device *dev)
  89 {
  90         struct uml_net_private *lp = dev->priv;
  91         char addr[sizeof("255.255.255.255\0")];
  92         int err;
  93
  94         spin_lock(&lp->lock);
  95
  96         if(lp->fd >= 0){
  97                 err = -ENXIO;
  98                 goto out;
  99         }
 100
 101         if(!lp->have_mac){
 102                 dev_ip_addr(dev, addr, &lp->mac[2]);
 103                 set_ether_mac(dev, lp->mac);
 104         }
 105
 106         lp->fd = (*lp->open)(&lp->user);
 107         if(lp->fd < 0){
 108                 err = lp->fd;
 109                 goto out;
 110         }
 111
 112         err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
 113                              SA_INTERRUPT | SA_SHIRQ, dev->name, dev);
 114         if(err != 0){
 115                 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
 116                 if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 117                 lp->fd = -1;
 118                 err = -ENETUNREACH;
 119         }
 120
 121         lp->tl.data = (unsigned long) &lp->user;
 122         netif_start_queue(dev);
 123
 124         spin_lock(&opened_lock);
 125         list_add(&lp->list, &opened);
 126         spin_unlock(&opened_lock);
 127  out:
 128         spin_unlock(&lp->lock);
 129         return(err);
 130 }
 131
 132 static int uml_net_close(struct net_device *dev)
 133 {
 134         struct uml_net_private *lp = dev->priv;
 135
 136         netif_stop_queue(dev);
 137         spin_lock(&lp->lock);
 138
 139         free_irq(dev->irq, dev);
 140         if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 141         lp->fd = -1;
 142         spin_lock(&opened_lock);
 143         list_del(&lp->list);
 144         spin_unlock(&opened_lock);
 145
 146         spin_unlock(&lp->lock);
 147         return 0;
 148 }
 149
 150 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
 151 {
 152         struct uml_net_private *lp = dev->priv;
 153         unsigned long flags;
 154         int len;
 155
 156         netif_stop_queue(dev);
 157
 158         spin_lock_irqsave(&lp->lock, flags);
 159
 160         len = (*lp->write)(lp->fd, &skb, lp);
 161
 162         if(len == skb->len) {
 163                 lp->stats.tx_packets++;
 164                 lp->stats.tx_bytes += skb->len;
 165                 dev->trans_start = jiffies;
 166                 netif_start_queue(dev);
 167
 168                 /* this is normally done in the interrupt when tx finishes */
 169                 netif_wake_queue(dev);
 170         }
 171         else if(len == 0){
 172                 netif_start_queue(dev);
 173                 lp->stats.tx_dropped++;
 174         }
 175         else {
 176                 netif_start_queue(dev);
 177                 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
 178         }
 179
 180         spin_unlock_irqrestore(&lp->lock, flags);
 181
 182         dev_kfree_skb(skb);
 183
 184         return 0;
 185 }
 186
 187 static struct net_device_stats *uml_net_get_stats(struct net_device *dev)
 188 {
 189         struct uml_net_private *lp = dev->priv;
 190         return &lp->stats;
 191 }
 192
 193 static void uml_net_set_multicast_list(struct net_device *dev)
 194 {
 195         if (dev->flags & IFF_PROMISC) return;
 196         else if (dev->mc_count) dev->flags |= IFF_ALLMULTI;
 197         else dev->flags &= ~IFF_ALLMULTI;
 198 }
 199
 200 static void uml_net_tx_timeout(struct net_device *dev)
 201 {
 202         dev->trans_start = jiffies;
 203         netif_wake_queue(dev);
 204 }
 205
 206 static int uml_net_set_mac(struct net_device *dev, void *addr)
 207 {
 208         struct uml_net_private *lp = dev->priv;
 209         struct sockaddr *hwaddr = addr;
 210
 211         spin_lock(&lp->lock);
 212         memcpy(dev->dev_addr, hwaddr->sa_data, ETH_ALEN);
 213         spin_unlock(&lp->lock);
 214
 215         return(0);
 216 }
 217
 218 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
 219 {
 220         struct uml_net_private *lp = dev->priv;
 221         int err = 0;
 222
 223         spin_lock(&lp->lock);
 224
 225         new_mtu = (*lp->set_mtu)(new_mtu, &lp->user);
 226         if(new_mtu < 0){
 227                 err = new_mtu;
 228                 goto out;
 229         }
 230
 231         dev->mtu = new_mtu;
 232
 233  out:
 234         spin_unlock(&lp->lock);
 235         return err;
 236 }
 237
 238 static int uml_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 239 {
 240         return(-EINVAL);
 241 }
 242
 243 void uml_net_user_timer_expire(unsigned long _conn)
 244 {
 245 #ifdef undef
 246         struct connection *conn = (struct connection *)_conn;
 247
 248         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
 249         do_connect(conn);
 250 #endif
 251 }
 252
 253 /*
 254  * default do nothing hard header packet routines for struct net_device init.
 255  * real ethernet transports will overwrite with real routines.
 256  */
 257 static int uml_net_hard_header(struct sk_buff *skb, struct net_device *dev,
 258                  unsigned short type, void *daddr, void *saddr, unsigned len)
 259 {
 260         return(0); /* no change */
 261 }
 262
 263 static int uml_net_rebuild_header(struct sk_buff *skb)
 264 {
 265         return(0); /* ignore */
 266 }
 267
 268 static int uml_net_header_cache(struct neighbour *neigh, struct hh_cache *hh)
 269 {
 270         return(-1); /* fail */
 271 }
 272
 273 static void uml_net_header_cache_update(struct hh_cache *hh,
 274                  struct net_device *dev, unsigned char * haddr)
 275 {
 276         /* ignore */
 277 }
 278
 279 static int uml_net_header_parse(struct sk_buff *skb, unsigned char *haddr)
 280 {
 281         return(0); /* nothing */
 282 }
 283
 284 static spinlock_t devices_lock = SPIN_LOCK_UNLOCKED;
 285 static struct list_head devices = LIST_HEAD_INIT(devices);
 286
 287 static int eth_configure(int n, void *init, char *mac,
 288                          struct transport *transport)
 289 {
 290         struct uml_net *device;
 291         struct net_device *dev;
 292         struct uml_net_private *lp;
 293         int err, size;
 294
 295         size = transport->private_size + sizeof(struct uml_net_private) +
 296                 sizeof(((struct uml_net_private *) 0)->user);
 297
 298         device = kmalloc(sizeof(*device), GFP_KERNEL);
 299         if (device == NULL) {
 300                 printk(KERN_ERR "eth_configure failed to allocate uml_net\n");
 301                 return(1);
 302         }
 303
 304         memset(device, 0, sizeof(*device));
 305         INIT_LIST_HEAD(&device->list);
 306         device->index = n;
 307
 308         spin_lock(&devices_lock);
 309         list_add(&device->list, &devices);
 310         spin_unlock(&devices_lock);
 311
 312         if (setup_etheraddr(mac, device->mac))
 313                 device->have_mac = 1;
 314
 315         printk(KERN_INFO "Netdevice %d ", n);
 316         if (device->have_mac)
 317                 printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
 318                        device->mac[0], device->mac[1],
 319                        device->mac[2], device->mac[3],
 320                        device->mac[4], device->mac[5]);
 321         printk(": ");
 322         dev = alloc_etherdev(size);
 323         if (dev == NULL) {
 324                 printk(KERN_ERR "eth_configure: failed to allocate device\n");
 325                 return 1;
 326         }
 327
 328         /* If this name ends up conflicting with an existing registered
 329          * netdevice, that is OK, register_netdev{,ice}() will notice this
 330          * and fail.
 331          */
 332         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
 333         device->dev = dev;
 334
 335         dev->hard_header = uml_net_hard_header;
 336         dev->rebuild_header = uml_net_rebuild_header;
 337         dev->hard_header_cache = uml_net_header_cache;
 338         dev->header_cache_update= uml_net_header_cache_update;
 339         dev->hard_header_parse = uml_net_header_parse;
 340
 341         (*transport->kern->init)(dev, init);
 342
 343         dev->mtu = transport->user->max_packet;
 344         dev->open = uml_net_open;
 345         dev->hard_start_xmit = uml_net_start_xmit;
 346         dev->stop = uml_net_close;
 347         dev->get_stats = uml_net_get_stats;
 348         dev->set_multicast_list = uml_net_set_multicast_list;
 349         dev->tx_timeout = uml_net_tx_timeout;
 350         dev->set_mac_address = uml_net_set_mac;
 351         dev->change_mtu = uml_net_change_mtu;
 352         dev->do_ioctl = uml_net_ioctl;
 353         dev->watchdog_timeo = (HZ >> 1);
 354         dev->irq = UM_ETH_IRQ;
 355
 356         rtnl_lock();
 357         err = register_netdevice(dev);
 358         rtnl_unlock();
 359         if (err) {
 360                 device->dev = NULL;
 361                 /* XXX: should we call ->remove() here? */
 362                 free_netdev(dev);
 363                 return 1;
 364         }
 365         lp = dev->priv;
 366
 367         INIT_LIST_HEAD(&lp->list);
 368         spin_lock_init(&lp->lock);
 369         lp->dev = dev;
 370         lp->fd = -1;
 371         lp->mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0 };
 372         lp->have_mac = device->have_mac;
 373         lp->protocol = transport->kern->protocol;
 374         lp->open = transport->user->open;
 375         lp->close = transport->user->close;
 376         lp->remove = transport->user->remove;
 377         lp->read = transport->kern->read;
 378         lp->write = transport->kern->write;
 379         lp->add_address = transport->user->add_address;
 380         lp->delete_address = transport->user->delete_address;
 381         lp->set_mtu = transport->user->set_mtu;
 382
 383         init_timer(&lp->tl);
 384         lp->tl.function = uml_net_user_timer_expire;
 385         if (lp->have_mac)
 386                 memcpy(lp->mac, device->mac, sizeof(lp->mac));
 387
 388         if (transport->user->init)
 389                 (*transport->user->init)(&lp->user, dev);
 390
 391         if (device->have_mac)
 392                 set_ether_mac(dev, device->mac);
 393         return(0);
 394 }
 395
 396 static struct uml_net *find_device(int n)
 397 {
 398         struct uml_net *device;
 399         struct list_head *ele;
 400
 401         spin_lock(&devices_lock);
 402         list_for_each(ele, &devices){
 403                 device = list_entry(ele, struct uml_net, list);
 404                 if(device->index == n)
 405                         goto out;
 406         }
 407         device = NULL;
 408  out:
 409         spin_unlock(&devices_lock);
 410         return(device);
 411 }
 412
 413 static int eth_parse(char *str, int *index_out, char **str_out)
 414 {
 415         char *end;
 416         int n;
 417
 418         n = simple_strtoul(str, &end, 0);
 419         if(end == str){
 420                 printk(KERN_ERR "eth_setup: Failed to parse '%s'\n", str);
 421                 return(1);
 422         }
 423         if(n < 0){
 424                 printk(KERN_ERR "eth_setup: device %d is negative\n", n);
 425                 return(1);
 426         }
 427         str = end;
 428         if(*str != '='){
 429                 printk(KERN_ERR
 430                        "eth_setup: expected '=' after device number\n");
 431                 return(1);
 432         }
 433         str++;
 434         if(find_device(n)){
 435                 printk(KERN_ERR "eth_setup: Device %d already configured\n",
 436                        n);
 437                 return(1);
 438         }
 439         if(index_out) *index_out = n;
 440         *str_out = str;
 441         return(0);
 442 }
 443
 444 struct eth_init {
 445         struct list_head list;
 446         char *init;
 447         int index;
 448 };
 449
 450 /* Filled in at boot time.  Will need locking if the transports become
 451  * modular.
 452  */
 453 struct list_head transports = LIST_HEAD_INIT(transports);
 454
 455 /* Filled in during early boot */
 456 struct list_head eth_cmd_line = LIST_HEAD_INIT(eth_cmd_line);
 457
 458 static int check_transport(struct transport *transport, char *eth, int n,
 459                            void **init_out, char **mac_out)
 460 {
 461         int len;
 462
 463         len = strlen(transport->name);
 464         if(strncmp(eth, transport->name, len))
 465                 return(0);
 466
 467         eth += len;
 468         if(*eth == ',')
 469                 eth++;
 470         else if(*eth != '\0')
 471                 return(0);
 472
 473         *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
 474         if(*init_out == NULL)
 475                 return(1);
 476
 477         if(!transport->setup(eth, mac_out, *init_out)){
 478                 kfree(*init_out);
 479                 *init_out = NULL;
 480         }
 481         return(1);
 482 }
 483
 484 void register_transport(struct transport *new)
 485 {
 486         struct list_head *ele, *next;
 487         struct eth_init *eth;
 488         void *init;
 489         char *mac = NULL;
 490         int match;
 491
 492         list_add(&new->list, &transports);
 493
 494         list_for_each_safe(ele, next, &eth_cmd_line){
 495                 eth = list_entry(ele, struct eth_init, list);
 496                 match = check_transport(new, eth->init, eth->index, &init,
 497                                         &mac);
 498                 if(!match)
 499                         continue;
 500                 else if(init != NULL){
 501                         eth_configure(eth->index, init, mac, new);
 502                         kfree(init);
 503                 }
 504                 list_del(&eth->list);
 505         }
 506 }
 507
 508 static int eth_setup_common(char *str, int index)
 509 {
 510         struct list_head *ele;
 511         struct transport *transport;
 512         void *init;
 513         char *mac = NULL;
 514
 515         list_for_each(ele, &transports){
 516                 transport = list_entry(ele, struct transport, list);
 517                 if(!check_transport(transport, str, index, &init, &mac))
 518                         continue;
 519                 if(init != NULL){
 520                         eth_configure(index, init, mac, transport);
 521                         kfree(init);
 522                 }
 523                 return(1);
 524         }
 525         return(0);
 526 }
 527
 528 static int eth_setup(char *str)
 529 {
 530         struct eth_init *new;
 531         int n, err;
 532
 533         err = eth_parse(str, &n, &str);
 534         if(err) return(1);
 535
 536         new = alloc_bootmem(sizeof(new));
 537         if (new == NULL){
 538                 printk("eth_init : alloc_bootmem failed\n");
 539                 return(1);
 540         }
 541
 542         INIT_LIST_HEAD(&new->list);
 543         new->index = n;
 544         new->init = str;
 545
 546         list_add_tail(&new->list, &eth_cmd_line);
 547         return(1);
 548 }
 549
 550 __setup("eth", eth_setup);
 551 __uml_help(eth_setup,
 552 "eth[0-9]+=<transport>,<options>\n"
 553 "    Configure a network device.\n\n"
 554 );
 555
 556 static int eth_init(void)
 557 {
 558         struct list_head *ele, *next;
 559         struct eth_init *eth;
 560
 561         list_for_each_safe(ele, next, &eth_cmd_line){
 562                 eth = list_entry(ele, struct eth_init, list);
 563
 564                 if(eth_setup_common(eth->init, eth->index))
 565                         list_del(&eth->list);
 566         }
 567
 568         return(1);
 569 }
 570
 571 __initcall(eth_init);
 572
 573 static int net_config(char *str)
 574 {
 575         int n, err;
 576
 577         err = eth_parse(str, &n, &str);
 578         if(err) return(err);
 579
 580         str = uml_strdup(str);
 581         if(str == NULL){
 582                 printk(KERN_ERR "net_config failed to strdup string\n");
 583                 return(-1);
 584         }
 585         err = !eth_setup_common(str, n);
 586         if(err)
 587                 kfree(str);
 588         return(err);
 589 }
 590
 591 static int net_remove(char *str)
 592 {
 593         struct uml_net *device;
 594         struct net_device *dev;
 595         struct uml_net_private *lp;
 596         char *end;
 597         int n;
 598
 599         n = simple_strtoul(str, &end, 0);
 600         if((*end != '\0') || (end == str))
 601                 return(-1);
 602
 603         device = find_device(n);
 604         if(device == NULL)
 605                 return(0);
 606
 607         dev = device->dev;
 608         lp = dev->priv;
 609         if(lp->fd > 0) return(-1);
 610         if(lp->remove != NULL) (*lp->remove)(&lp->user);
 611         unregister_netdev(dev);
 612
 613         list_del(&device->list);
 614         free_netdev(device);
 615         return(0);
 616 }
 617
 618 static struct mc_device net_mc = {
 619         .name           = "eth",
 620         .config         = net_config,
 621         .get_config     = NULL,
 622         .remove         = net_remove,
 623 };
 624
 625 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 626                               void *ptr)
 627 {
 628         struct in_ifaddr *ifa = ptr;
 629         u32 addr = ifa->ifa_address;
 630         u32 netmask = ifa->ifa_mask;
 631         struct net_device *dev = ifa->ifa_dev->dev;
 632         struct uml_net_private *lp;
 633         void (*proc)(unsigned char *, unsigned char *, void *);
 634         unsigned char addr_buf[4], netmask_buf[4];
 635
 636         if(dev->open != uml_net_open) return(NOTIFY_DONE);
 637
 638         lp = dev->priv;
 639
 640         proc = NULL;
 641         switch (event){
 642         case NETDEV_UP:
 643                 proc = lp->add_address;
 644                 break;
 645         case NETDEV_DOWN:
 646                 proc = lp->delete_address;
 647                 break;
 648         }
 649         if(proc != NULL){
 650                 addr_buf[0] = addr & 0xff;
 651                 addr_buf[1] = (addr >> 8) & 0xff;
 652                 addr_buf[2] = (addr >> 16) & 0xff;
 653                 addr_buf[3] = addr >> 24;
 654                 netmask_buf[0] = netmask & 0xff;
 655                 netmask_buf[1] = (netmask >> 8) & 0xff;
 656                 netmask_buf[2] = (netmask >> 16) & 0xff;
 657                 netmask_buf[3] = netmask >> 24;
 658                 (*proc)(addr_buf, netmask_buf, &lp->user);
 659         }
 660         return(NOTIFY_DONE);
 661 }
 662
 663 struct notifier_block uml_inetaddr_notifier = {
 664         .notifier_call          = uml_inetaddr_event,
 665 };
 666
 667 static int uml_net_init(void)
 668 {
 669         struct list_head *ele;
 670         struct uml_net_private *lp;
 671         struct in_device *ip;
 672         struct in_ifaddr *in;
 673
 674         mconsole_register_dev(&net_mc);
 675         register_inetaddr_notifier(&uml_inetaddr_notifier);
 676
 677         /* Devices may have been opened already, so the uml_inetaddr_notifier
 678          * didn't get a chance to run for them.  This fakes it so that
 679          * addresses which have already been set up get handled properly.
 680          */
 681         list_for_each(ele, &opened){
 682                 lp = list_entry(ele, struct uml_net_private, list);
 683                 ip = lp->dev->ip_ptr;
 684                 if(ip == NULL) continue;
 685                 in = ip->ifa_list;
 686                 while(in != NULL){
 687                         uml_inetaddr_event(NULL, NETDEV_UP, in);
 688                         in = in->ifa_next;
 689                 }
 690         }
 691
 692         return(0);
 693 }
 694
 695 __initcall(uml_net_init);
 696
 697 static void close_devices(void)
 698 {
 699         struct list_head *ele;
 700         struct uml_net_private *lp;
 701
 702         list_for_each(ele, &opened){
 703                 lp = list_entry(ele, struct uml_net_private, list);
 704                 if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 705                 if(lp->remove != NULL) (*lp->remove)(&lp->user);
 706         }
 707 }
 708
 709 __uml_exitcall(close_devices);
 710
 711 int setup_etheraddr(char *str, unsigned char *addr)
 712 {
 713         char *end;
 714         int i;
 715
 716         if(str == NULL)
 717                 return(0);
 718         for(i=0;i<6;i++){
 719                 addr[i] = simple_strtoul(str, &end, 16);
 720                 if((end == str) ||
 721                    ((*end != ':') && (*end != ',') && (*end != '\0'))){
 722                         printk(KERN_ERR
 723                                "setup_etheraddr: failed to parse '%s' "
 724                                "as an ethernet address\n", str);
 725                         return(0);
 726                 }
 727                 str = end + 1;
 728         }
 729         if(addr[0] & 1){
 730                 printk(KERN_ERR
 731                        "Attempt to assign a broadcast ethernet address to a "
 732                        "device disallowed\n");
 733                 return(0);
 734         }
 735         return(1);
 736 }
 737
 738 void dev_ip_addr(void *d, char *buf, char *bin_buf)
 739 {
 740         struct net_device *dev = d;
 741         struct in_device *ip = dev->ip_ptr;
 742         struct in_ifaddr *in;
 743         u32 addr;
 744
 745         if((ip == NULL) || ((in = ip->ifa_list) == NULL)){
 746                 printk(KERN_WARNING "dev_ip_addr - device not assigned an "
 747                        "IP address\n");
 748                 return;
 749         }
 750         addr = in->ifa_address;
 751         sprintf(buf, "%d.%d.%d.%d", addr & 0xff, (addr >> 8) & 0xff,
 752                 (addr >> 16) & 0xff, addr >> 24);
 753         if(bin_buf){
 754                 bin_buf[0] = addr & 0xff;
 755                 bin_buf[1] = (addr >> 8) & 0xff;
 756                 bin_buf[2] = (addr >> 16) & 0xff;
 757                 bin_buf[3] = addr >> 24;
 758         }
 759 }
 760
 761 void set_ether_mac(void *d, unsigned char *addr)
 762 {
 763         struct net_device *dev = d;
 764
 765         memcpy(dev->dev_addr, addr, ETH_ALEN);
 766 }
 767
 768 struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
 769 {
 770         if((skb != NULL) && (skb_tailroom(skb) < extra)){
 771                 struct sk_buff *skb2;
 772
 773                 skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
 774                 dev_kfree_skb(skb);
 775                 skb = skb2;
 776         }
 777         if(skb != NULL) skb_put(skb, extra);
 778         return(skb);
 779 }
 780
 781 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 782                                         void *),
 783                     void *arg)
 784 {
 785         struct net_device *dev = d;
 786         struct in_device *ip = dev->ip_ptr;
 787         struct in_ifaddr *in;
 788         unsigned char address[4], netmask[4];
 789
 790         if(ip == NULL) return;
 791         in = ip->ifa_list;
 792         while(in != NULL){
 793                 address[0] = in->ifa_address & 0xff;
 794                 address[1] = (in->ifa_address >> 8) & 0xff;
 795                 address[2] = (in->ifa_address >> 16) & 0xff;
 796                 address[3] = in->ifa_address >> 24;
 797                 netmask[0] = in->ifa_mask & 0xff;
 798                 netmask[1] = (in->ifa_mask >> 8) & 0xff;
 799                 netmask[2] = (in->ifa_mask >> 16) & 0xff;
 800                 netmask[3] = in->ifa_mask >> 24;
 801                 (*cb)(address, netmask, arg);
 802                 in = in->ifa_next;
 803         }
 804 }
 805
 806 int dev_netmask(void *d, void *m)
 807 {
 808         struct net_device *dev = d;
 809         struct in_device *ip = dev->ip_ptr;
 810         struct in_ifaddr *in;
 811         __u32 *mask_out = m;
 812
 813         if(ip == NULL)
 814                 return(1);
 815
 816         in = ip->ifa_list;
 817         if(in == NULL)
 818                 return(1);
 819
 820         *mask_out = in->ifa_mask;
 821         return(0);
 822 }
 823
 824 void *get_output_buffer(int *len_out)
 825 {
 826         void *ret;
 827
 828         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 829         if(ret) *len_out = PAGE_SIZE;
 830         else *len_out = 0;
 831         return(ret);
 832 }
 833
 834 void free_output_buffer(void *buffer)
 835 {
 836         free_pages((unsigned long) buffer, 0);
 837 }
 838
 839 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 840                      char **gate_addr)
 841 {
 842         char *remain;
 843
 844         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 845         if(remain != NULL){
 846                 printk("tap_setup_common - Extra garbage on specification : "
 847                        "'%s'\n", remain);
 848                 return(1);
 849         }
 850
 851         return(0);
 852 }
 853
 854 unsigned short eth_protocol(struct sk_buff *skb)
 855 {
 856         return(eth_type_trans(skb, skb->dev));
 857 }
 858
 859 /*
 860  * Overrides for Emacs so that we follow Linus's tabbing style.
 861  * Emacs will notice this stuff at the end of the file and automatically
 862  * adjust the settings for this buffer only.  This must remain at the end
 863  * of the file.
 864  * ---------------------------------------------------------------------------
 865  * Local variables:
 866  * c-file-style: "linux"
 867  * End:
 868  */