1 /* 2 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) 3 * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and 4 * James Leu (jleu@mindspring.net). 5 * Copyright (C) 2001 by various other people who didn't put their name here. 6 * Licensed under the GPL. 7 */ 8 9 #include <linux/bootmem.h> 10 #include <linux/etherdevice.h> 11 #include <linux/ethtool.h> 12 #include <linux/inetdevice.h> 13 #include <linux/init.h> 14 #include <linux/list.h> 15 #include <linux/netdevice.h> 16 #include <linux/platform_device.h> 17 #include <linux/rtnetlink.h> 18 #include <linux/skbuff.h> 19 #include <linux/slab.h> 20 #include <linux/spinlock.h> 21 #include "init.h" 22 #include "irq_kern.h" 23 #include "irq_user.h" 24 #include "mconsole_kern.h" 25 #include "net_kern.h" 26 #include "net_user.h" 27 28 #define DRIVER_NAME "uml-netdev" 29 30 static DEFINE_SPINLOCK(opened_lock); 31 static LIST_HEAD(opened); 32 33 /* 34 * The drop_skb is used when we can't allocate an skb. The 35 * packet is read into drop_skb in order to get the data off the 36 * connection to the host. 37 * It is reallocated whenever a maximum packet size is seen which is 38 * larger than any seen before. update_drop_skb is called from 39 * eth_configure when a new interface is added. 40 */ 41 static DEFINE_SPINLOCK(drop_lock); 42 static struct sk_buff *drop_skb; 43 static int drop_max; 44 45 static int update_drop_skb(int max) 46 { 47 struct sk_buff *new; 48 unsigned long flags; 49 int err = 0; 50 51 spin_lock_irqsave(&drop_lock, flags); 52 53 if (max <= drop_max) 54 goto out; 55 56 err = -ENOMEM; 57 new = dev_alloc_skb(max); 58 if (new == NULL) 59 goto out; 60 61 skb_put(new, max); 62 63 kfree_skb(drop_skb); 64 drop_skb = new; 65 drop_max = max; 66 err = 0; 67 out: 68 spin_unlock_irqrestore(&drop_lock, flags); 69 70 return err; 71 } 72 73 static int uml_net_rx(struct net_device *dev) 74 { 75 struct uml_net_private *lp = netdev_priv(dev); 76 int pkt_len; 77 struct sk_buff *skb; 78 79 /* If we can't allocate memory, try again next round. */ 80 skb = dev_alloc_skb(lp->max_packet); 81 if (skb == NULL) { 82 drop_skb->dev = dev; 83 /* Read a packet into drop_skb and don't do anything with it. */ 84 (*lp->read)(lp->fd, drop_skb, lp); 85 dev->stats.rx_dropped++; 86 return 0; 87 } 88 89 skb->dev = dev; 90 skb_put(skb, lp->max_packet); 91 skb_reset_mac_header(skb); 92 pkt_len = (*lp->read)(lp->fd, skb, lp); 93 94 if (pkt_len > 0) { 95 skb_trim(skb, pkt_len); 96 skb->protocol = (*lp->protocol)(skb); 97 98 dev->stats.rx_bytes += skb->len; 99 dev->stats.rx_packets++; 100 netif_rx(skb); 101 return pkt_len; 102 } 103 104 kfree_skb(skb); 105 return pkt_len; 106 } 107 108 static void uml_dev_close(struct work_struct *work) 109 { 110 struct uml_net_private *lp = 111 container_of(work, struct uml_net_private, work); 112 dev_close(lp->dev); 113 } 114 115 static irqreturn_t uml_net_interrupt(int irq, void *dev_id) 116 { 117 struct net_device *dev = dev_id; 118 struct uml_net_private *lp = netdev_priv(dev); 119 int err; 120 121 if (!netif_running(dev)) 122 return IRQ_NONE; 123 124 spin_lock(&lp->lock); 125 while ((err = uml_net_rx(dev)) > 0) ; 126 if (err < 0) { 127 printk(KERN_ERR 128 "Device '%s' read returned %d, shutting it down\n", 129 dev->name, err); 130 /* dev_close can't be called in interrupt context, and takes 131 * again lp->lock. 132 * And dev_close() can be safely called multiple times on the 133 * same device, since it tests for (dev->flags & IFF_UP). So 134 * there's no harm in delaying the device shutdown. 135 * Furthermore, the workqueue will not re-enqueue an already 136 * enqueued work item. */ 137 schedule_work(&lp->work); 138 goto out; 139 } 140 reactivate_fd(lp->fd, UM_ETH_IRQ); 141 142 out: 143 spin_unlock(&lp->lock); 144 return IRQ_HANDLED; 145 } 146 147 static int uml_net_open(struct net_device *dev) 148 { 149 struct uml_net_private *lp = netdev_priv(dev); 150 int err; 151 152 if (lp->fd >= 0) { 153 err = -ENXIO; 154 goto out; 155 } 156 157 lp->fd = (*lp->open)(&lp->user); 158 if (lp->fd < 0) { 159 err = lp->fd; 160 goto out; 161 } 162 163 err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt, 164 IRQF_SHARED, dev->name, dev); 165 if (err != 0) { 166 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err); 167 err = -ENETUNREACH; 168 goto out_close; 169 } 170 171 lp->tl.data = (unsigned long) &lp->user; 172 netif_start_queue(dev); 173 174 /* clear buffer - it can happen that the host side of the interface 175 * is full when we get here. In this case, new data is never queued, 176 * SIGIOs never arrive, and the net never works. 177 */ 178 while ((err = uml_net_rx(dev)) > 0) ; 179 180 spin_lock(&opened_lock); 181 list_add(&lp->list, &opened); 182 spin_unlock(&opened_lock); 183 184 return 0; 185 out_close: 186 if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user); 187 lp->fd = -1; 188 out: 189 return err; 190 } 191 192 static int uml_net_close(struct net_device *dev) 193 { 194 struct uml_net_private *lp = netdev_priv(dev); 195 196 netif_stop_queue(dev); 197 198 free_irq(dev->irq, dev); 199 if (lp->close != NULL) 200 (*lp->close)(lp->fd, &lp->user); 201 lp->fd = -1; 202 203 spin_lock(&opened_lock); 204 list_del(&lp->list); 205 spin_unlock(&opened_lock); 206 207 return 0; 208 } 209 210 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev) 211 { 212 struct uml_net_private *lp = netdev_priv(dev); 213 unsigned long flags; 214 int len; 215 216 netif_stop_queue(dev); 217 218 spin_lock_irqsave(&lp->lock, flags); 219 220 len = (*lp->write)(lp->fd, skb, lp); 221 222 if (len == skb->len) { 223 dev->stats.tx_packets++; 224 dev->stats.tx_bytes += skb->len; 225 dev->trans_start = jiffies; 226 netif_start_queue(dev); 227 228 /* this is normally done in the interrupt when tx finishes */ 229 netif_wake_queue(dev); 230 } 231 else if (len == 0) { 232 netif_start_queue(dev); 233 dev->stats.tx_dropped++; 234 } 235 else { 236 netif_start_queue(dev); 237 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len); 238 } 239 240 spin_unlock_irqrestore(&lp->lock, flags); 241 242 dev_kfree_skb(skb); 243 244 return NETDEV_TX_OK; 245 } 246 247 static void uml_net_set_multicast_list(struct net_device *dev) 248 { 249 return; 250 } 251 252 static void uml_net_tx_timeout(struct net_device *dev) 253 { 254 dev->trans_start = jiffies; 255 netif_wake_queue(dev); 256 } 257 258 static int uml_net_change_mtu(struct net_device *dev, int new_mtu) 259 { 260 dev->mtu = new_mtu; 261 262 return 0; 263 } 264 265 #ifdef CONFIG_NET_POLL_CONTROLLER 266 static void uml_net_poll_controller(struct net_device *dev) 267 { 268 disable_irq(dev->irq); 269 uml_net_interrupt(dev->irq, dev); 270 enable_irq(dev->irq); 271 } 272 #endif 273 274 static void uml_net_get_drvinfo(struct net_device *dev, 275 struct ethtool_drvinfo *info) 276 { 277 strcpy(info->driver, DRIVER_NAME); 278 strcpy(info->version, "42"); 279 } 280 281 static const struct ethtool_ops uml_net_ethtool_ops = { 282 .get_drvinfo = uml_net_get_drvinfo, 283 .get_link = ethtool_op_get_link, 284 }; 285 286 static void uml_net_user_timer_expire(unsigned long _conn) 287 { 288 #ifdef undef 289 struct connection *conn = (struct connection *)_conn; 290 291 dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn); 292 do_connect(conn); 293 #endif 294 } 295 296 static int setup_etheraddr(char *str, unsigned char *addr, char *name) 297 { 298 char *end; 299 int i; 300 301 if (str == NULL) 302 goto random; 303 304 for (i = 0; i < 6; i++) { 305 addr[i] = simple_strtoul(str, &end, 16); 306 if ((end == str) || 307 ((*end != ':') && (*end != ',') && (*end != '\0'))) { 308 printk(KERN_ERR 309 "setup_etheraddr: failed to parse '%s' " 310 "as an ethernet address\n", str); 311 goto random; 312 } 313 str = end + 1; 314 } 315 if (is_multicast_ether_addr(addr)) { 316 printk(KERN_ERR 317 "Attempt to assign a multicast ethernet address to a " 318 "device disallowed\n"); 319 goto random; 320 } 321 if (!is_valid_ether_addr(addr)) { 322 printk(KERN_ERR 323 "Attempt to assign an invalid ethernet address to a " 324 "device disallowed\n"); 325 goto random; 326 } 327 if (!is_local_ether_addr(addr)) { 328 printk(KERN_WARNING 329 "Warning: Assigning a globally valid ethernet " 330 "address to a device\n"); 331 printk(KERN_WARNING "You should set the 2nd rightmost bit in " 332 "the first byte of the MAC,\n"); 333 printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n", 334 addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4], 335 addr[5]); 336 } 337 return 0; 338 339 random: 340 printk(KERN_INFO 341 "Choosing a random ethernet address for device %s\n", name); 342 random_ether_addr(addr); 343 return 1; 344 } 345 346 static DEFINE_SPINLOCK(devices_lock); 347 static LIST_HEAD(devices); 348 349 static struct platform_driver uml_net_driver = { 350 .driver = { 351 .name = DRIVER_NAME, 352 }, 353 }; 354 355 static void net_device_release(struct device *dev) 356 { 357 struct uml_net *device = dev_get_drvdata(dev); 358 struct net_device *netdev = device->dev; 359 struct uml_net_private *lp = netdev_priv(netdev); 360 361 if (lp->remove != NULL) 362 (*lp->remove)(&lp->user); 363 list_del(&device->list); 364 kfree(device); 365 free_netdev(netdev); 366 } 367 368 static const struct net_device_ops uml_netdev_ops = { 369 .ndo_open = uml_net_open, 370 .ndo_stop = uml_net_close, 371 .ndo_start_xmit = uml_net_start_xmit, 372 .ndo_set_rx_mode = uml_net_set_multicast_list, 373 .ndo_tx_timeout = uml_net_tx_timeout, 374 .ndo_set_mac_address = eth_mac_addr, 375 .ndo_change_mtu = uml_net_change_mtu, 376 .ndo_validate_addr = eth_validate_addr, 377 #ifdef CONFIG_NET_POLL_CONTROLLER 378 .ndo_poll_controller = uml_net_poll_controller, 379 #endif 380 }; 381 382 /* 383 * Ensures that platform_driver_register is called only once by 384 * eth_configure. Will be set in an initcall. 385 */ 386 static int driver_registered; 387 388 static void eth_configure(int n, void *init, char *mac, 389 struct transport *transport) 390 { 391 struct uml_net *device; 392 struct net_device *dev; 393 struct uml_net_private *lp; 394 int err, size; 395 int random_mac; 396 397 size = transport->private_size + sizeof(struct uml_net_private); 398 399 device = kzalloc(sizeof(*device), GFP_KERNEL); 400 if (device == NULL) { 401 printk(KERN_ERR "eth_configure failed to allocate struct " 402 "uml_net\n"); 403 return; 404 } 405 406 dev = alloc_etherdev(size); 407 if (dev == NULL) { 408 printk(KERN_ERR "eth_configure: failed to allocate struct " 409 "net_device for eth%d\n", n); 410 goto out_free_device; 411 } 412 413 INIT_LIST_HEAD(&device->list); 414 device->index = n; 415 416 /* If this name ends up conflicting with an existing registered 417 * netdevice, that is OK, register_netdev{,ice}() will notice this 418 * and fail. 419 */ 420 snprintf(dev->name, sizeof(dev->name), "eth%d", n); 421 422 random_mac = setup_etheraddr(mac, device->mac, dev->name); 423 424 printk(KERN_INFO "Netdevice %d (%pM) : ", n, device->mac); 425 426 lp = netdev_priv(dev); 427 /* This points to the transport private data. It's still clear, but we 428 * must memset it to 0 *now*. Let's help the drivers. */ 429 memset(lp, 0, size); 430 INIT_WORK(&lp->work, uml_dev_close); 431 432 /* sysfs register */ 433 if (!driver_registered) { 434 platform_driver_register(¨_net_driver); 435 driver_registered = 1; 436 } 437 device->pdev.id = n; 438 device->pdev.name = DRIVER_NAME; 439 device->pdev.dev.release = net_device_release; 440 dev_set_drvdata(&device->pdev.dev, device); 441 if (platform_device_register(&device->pdev)) 442 goto out_free_netdev; 443 SET_NETDEV_DEV(dev,&device->pdev.dev); 444 445 device->dev = dev; 446 447 /* 448 * These just fill in a data structure, so there's no failure 449 * to be worried about. 450 */ 451 (*transport->kern->init)(dev, init); 452 453 *lp = ((struct uml_net_private) 454 { .list = LIST_HEAD_INIT(lp->list), 455 .dev = dev, 456 .fd = -1, 457 .mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0}, 458 .max_packet = transport->user->max_packet, 459 .protocol = transport->kern->protocol, 460 .open = transport->user->open, 461 .close = transport->user->close, 462 .remove = transport->user->remove, 463 .read = transport->kern->read, 464 .write = transport->kern->write, 465 .add_address = transport->user->add_address, 466 .delete_address = transport->user->delete_address }); 467 468 init_timer(&lp->tl); 469 spin_lock_init(&lp->lock); 470 lp->tl.function = uml_net_user_timer_expire; 471 memcpy(lp->mac, device->mac, sizeof(lp->mac)); 472 473 if ((transport->user->init != NULL) && 474 ((*transport->user->init)(&lp->user, dev) != 0)) 475 goto out_unregister; 476 477 /* don't use eth_mac_addr, it will not work here */ 478 memcpy(dev->dev_addr, device->mac, ETH_ALEN); 479 if (random_mac) 480 dev->addr_assign_type |= NET_ADDR_RANDOM; 481 482 dev->mtu = transport->user->mtu; 483 dev->netdev_ops = ¨_netdev_ops; 484 dev->ethtool_ops = ¨_net_ethtool_ops; 485 dev->watchdog_timeo = (HZ >> 1); 486 dev->irq = UM_ETH_IRQ; 487 488 err = update_drop_skb(lp->max_packet); 489 if (err) 490 goto out_undo_user_init; 491 492 rtnl_lock(); 493 err = register_netdevice(dev); 494 rtnl_unlock(); 495 if (err) 496 goto out_undo_user_init; 497 498 spin_lock(&devices_lock); 499 list_add(&device->list, &devices); 500 spin_unlock(&devices_lock); 501 502 return; 503 504 out_undo_user_init: 505 if (transport->user->remove != NULL) 506 (*transport->user->remove)(&lp->user); 507 out_unregister: 508 platform_device_unregister(&device->pdev); 509 return; /* platform_device_unregister frees dev and device */ 510 out_free_netdev: 511 free_netdev(dev); 512 out_free_device: 513 kfree(device); 514 } 515 516 static struct uml_net *find_device(int n) 517 { 518 struct uml_net *device; 519 struct list_head *ele; 520 521 spin_lock(&devices_lock); 522 list_for_each(ele, &devices) { 523 device = list_entry(ele, struct uml_net, list); 524 if (device->index == n) 525 goto out; 526 } 527 device = NULL; 528 out: 529 spin_unlock(&devices_lock); 530 return device; 531 } 532 533 static int eth_parse(char *str, int *index_out, char **str_out, 534 char **error_out) 535 { 536 char *end; 537 int n, err = -EINVAL; 538 539 n = simple_strtoul(str, &end, 0); 540 if (end == str) { 541 *error_out = "Bad device number"; 542 return err; 543 } 544 545 str = end; 546 if (*str != '=') { 547 *error_out = "Expected '=' after device number"; 548 return err; 549 } 550 551 str++; 552 if (find_device(n)) { 553 *error_out = "Device already configured"; 554 return err; 555 } 556 557 *index_out = n; 558 *str_out = str; 559 return 0; 560 } 561 562 struct eth_init { 563 struct list_head list; 564 char *init; 565 int index; 566 }; 567 568 static DEFINE_SPINLOCK(transports_lock); 569 static LIST_HEAD(transports); 570 571 /* Filled in during early boot */ 572 static LIST_HEAD(eth_cmd_line); 573 574 static int check_transport(struct transport *transport, char *eth, int n, 575 void **init_out, char **mac_out) 576 { 577 int len; 578 579 len = strlen(transport->name); 580 if (strncmp(eth, transport->name, len)) 581 return 0; 582 583 eth += len; 584 if (*eth == ',') 585 eth++; 586 else if (*eth != '\0') 587 return 0; 588 589 *init_out = kmalloc(transport->setup_size, GFP_KERNEL); 590 if (*init_out == NULL) 591 return 1; 592 593 if (!transport->setup(eth, mac_out, *init_out)) { 594 kfree(*init_out); 595 *init_out = NULL; 596 } 597 return 1; 598 } 599 600 void register_transport(struct transport *new) 601 { 602 struct list_head *ele, *next; 603 struct eth_init *eth; 604 void *init; 605 char *mac = NULL; 606 int match; 607 608 spin_lock(&transports_lock); 609 BUG_ON(!list_empty(&new->list)); 610 list_add(&new->list, &transports); 611 spin_unlock(&transports_lock); 612 613 list_for_each_safe(ele, next, ð_cmd_line) { 614 eth = list_entry(ele, struct eth_init, list); 615 match = check_transport(new, eth->init, eth->index, &init, 616 &mac); 617 if (!match) 618 continue; 619 else if (init != NULL) { 620 eth_configure(eth->index, init, mac, new); 621 kfree(init); 622 } 623 list_del(ð->list); 624 } 625 } 626 627 static int eth_setup_common(char *str, int index) 628 { 629 struct list_head *ele; 630 struct transport *transport; 631 void *init; 632 char *mac = NULL; 633 int found = 0; 634 635 spin_lock(&transports_lock); 636 list_for_each(ele, &transports) { 637 transport = list_entry(ele, struct transport, list); 638 if (!check_transport(transport, str, index, &init, &mac)) 639 continue; 640 if (init != NULL) { 641 eth_configure(index, init, mac, transport); 642 kfree(init); 643 } 644 found = 1; 645 break; 646 } 647 648 spin_unlock(&transports_lock); 649 return found; 650 } 651 652 static int __init eth_setup(char *str) 653 { 654 struct eth_init *new; 655 char *error; 656 int n, err; 657 658 err = eth_parse(str, &n, &str, &error); 659 if (err) { 660 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n", 661 str, error); 662 return 1; 663 } 664 665 new = alloc_bootmem(sizeof(*new)); 666 if (new == NULL) { 667 printk(KERN_ERR "eth_init : alloc_bootmem failed\n"); 668 return 1; 669 } 670 671 INIT_LIST_HEAD(&new->list); 672 new->index = n; 673 new->init = str; 674 675 list_add_tail(&new->list, ð_cmd_line); 676 return 1; 677 } 678 679 __setup("eth", eth_setup); 680 __uml_help(eth_setup, 681 "eth[0-9]+=<transport>,<options>\n" 682 " Configure a network device.\n\n" 683 ); 684 685 static int net_config(char *str, char **error_out) 686 { 687 int n, err; 688 689 err = eth_parse(str, &n, &str, error_out); 690 if (err) 691 return err; 692 693 /* This string is broken up and the pieces used by the underlying 694 * driver. So, it is freed only if eth_setup_common fails. 695 */ 696 str = kstrdup(str, GFP_KERNEL); 697 if (str == NULL) { 698 *error_out = "net_config failed to strdup string"; 699 return -ENOMEM; 700 } 701 err = !eth_setup_common(str, n); 702 if (err) 703 kfree(str); 704 return err; 705 } 706 707 static int net_id(char **str, int *start_out, int *end_out) 708 { 709 char *end; 710 int n; 711 712 n = simple_strtoul(*str, &end, 0); 713 if ((*end != '\0') || (end == *str)) 714 return -1; 715 716 *start_out = n; 717 *end_out = n; 718 *str = end; 719 return n; 720 } 721 722 static int net_remove(int n, char **error_out) 723 { 724 struct uml_net *device; 725 struct net_device *dev; 726 struct uml_net_private *lp; 727 728 device = find_device(n); 729 if (device == NULL) 730 return -ENODEV; 731 732 dev = device->dev; 733 lp = netdev_priv(dev); 734 if (lp->fd > 0) 735 return -EBUSY; 736 unregister_netdev(dev); 737 platform_device_unregister(&device->pdev); 738 739 return 0; 740 } 741 742 static struct mc_device net_mc = { 743 .list = LIST_HEAD_INIT(net_mc.list), 744 .name = "eth", 745 .config = net_config, 746 .get_config = NULL, 747 .id = net_id, 748 .remove = net_remove, 749 }; 750 751 #ifdef CONFIG_INET 752 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event, 753 void *ptr) 754 { 755 struct in_ifaddr *ifa = ptr; 756 struct net_device *dev = ifa->ifa_dev->dev; 757 struct uml_net_private *lp; 758 void (*proc)(unsigned char *, unsigned char *, void *); 759 unsigned char addr_buf[4], netmask_buf[4]; 760 761 if (dev->netdev_ops->ndo_open != uml_net_open) 762 return NOTIFY_DONE; 763 764 lp = netdev_priv(dev); 765 766 proc = NULL; 767 switch (event) { 768 case NETDEV_UP: 769 proc = lp->add_address; 770 break; 771 case NETDEV_DOWN: 772 proc = lp->delete_address; 773 break; 774 } 775 if (proc != NULL) { 776 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf)); 777 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf)); 778 (*proc)(addr_buf, netmask_buf, &lp->user); 779 } 780 return NOTIFY_DONE; 781 } 782 783 /* uml_net_init shouldn't be called twice on two CPUs at the same time */ 784 static struct notifier_block uml_inetaddr_notifier = { 785 .notifier_call = uml_inetaddr_event, 786 }; 787 788 static void inet_register(void) 789 { 790 struct list_head *ele; 791 struct uml_net_private *lp; 792 struct in_device *ip; 793 struct in_ifaddr *in; 794 795 register_inetaddr_notifier(¨_inetaddr_notifier); 796 797 /* Devices may have been opened already, so the uml_inetaddr_notifier 798 * didn't get a chance to run for them. This fakes it so that 799 * addresses which have already been set up get handled properly. 800 */ 801 spin_lock(&opened_lock); 802 list_for_each(ele, &opened) { 803 lp = list_entry(ele, struct uml_net_private, list); 804 ip = lp->dev->ip_ptr; 805 if (ip == NULL) 806 continue; 807 in = ip->ifa_list; 808 while (in != NULL) { 809 uml_inetaddr_event(NULL, NETDEV_UP, in); 810 in = in->ifa_next; 811 } 812 } 813 spin_unlock(&opened_lock); 814 } 815 #else 816 static inline void inet_register(void) 817 { 818 } 819 #endif 820 821 static int uml_net_init(void) 822 { 823 mconsole_register_dev(&net_mc); 824 inet_register(); 825 return 0; 826 } 827 828 __initcall(uml_net_init); 829 830 static void close_devices(void) 831 { 832 struct list_head *ele; 833 struct uml_net_private *lp; 834 835 spin_lock(&opened_lock); 836 list_for_each(ele, &opened) { 837 lp = list_entry(ele, struct uml_net_private, list); 838 free_irq(lp->dev->irq, lp->dev); 839 if ((lp->close != NULL) && (lp->fd >= 0)) 840 (*lp->close)(lp->fd, &lp->user); 841 if (lp->remove != NULL) 842 (*lp->remove)(&lp->user); 843 } 844 spin_unlock(&opened_lock); 845 } 846 847 __uml_exitcall(close_devices); 848 849 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *, 850 void *), 851 void *arg) 852 { 853 struct net_device *dev = d; 854 struct in_device *ip = dev->ip_ptr; 855 struct in_ifaddr *in; 856 unsigned char address[4], netmask[4]; 857 858 if (ip == NULL) return; 859 in = ip->ifa_list; 860 while (in != NULL) { 861 memcpy(address, &in->ifa_address, sizeof(address)); 862 memcpy(netmask, &in->ifa_mask, sizeof(netmask)); 863 (*cb)(address, netmask, arg); 864 in = in->ifa_next; 865 } 866 } 867 868 int dev_netmask(void *d, void *m) 869 { 870 struct net_device *dev = d; 871 struct in_device *ip = dev->ip_ptr; 872 struct in_ifaddr *in; 873 __be32 *mask_out = m; 874 875 if (ip == NULL) 876 return 1; 877 878 in = ip->ifa_list; 879 if (in == NULL) 880 return 1; 881 882 *mask_out = in->ifa_mask; 883 return 0; 884 } 885 886 void *get_output_buffer(int *len_out) 887 { 888 void *ret; 889 890 ret = (void *) __get_free_pages(GFP_KERNEL, 0); 891 if (ret) *len_out = PAGE_SIZE; 892 else *len_out = 0; 893 return ret; 894 } 895 896 void free_output_buffer(void *buffer) 897 { 898 free_pages((unsigned long) buffer, 0); 899 } 900 901 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out, 902 char **gate_addr) 903 { 904 char *remain; 905 906 remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL); 907 if (remain != NULL) { 908 printk(KERN_ERR "tap_setup_common - Extra garbage on " 909 "specification : '%s'\n", remain); 910 return 1; 911 } 912 913 return 0; 914 } 915 916 unsigned short eth_protocol(struct sk_buff *skb) 917 { 918 return eth_type_trans(skb, skb->dev); 919 } 920