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 um_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 strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver)); 278 strlcpy(info->version, "42", sizeof(info->version)); 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 void setup_etheraddr(struct net_device *dev, char *str) 297 { 298 unsigned char *addr = dev->dev_addr; 299 char *end; 300 int i; 301 302 if (str == NULL) 303 goto random; 304 305 for (i = 0; i < 6; i++) { 306 addr[i] = simple_strtoul(str, &end, 16); 307 if ((end == str) || 308 ((*end != ':') && (*end != ',') && (*end != '\0'))) { 309 printk(KERN_ERR 310 "setup_etheraddr: failed to parse '%s' " 311 "as an ethernet address\n", str); 312 goto random; 313 } 314 str = end + 1; 315 } 316 if (is_multicast_ether_addr(addr)) { 317 printk(KERN_ERR 318 "Attempt to assign a multicast ethernet address to a " 319 "device disallowed\n"); 320 goto random; 321 } 322 if (!is_valid_ether_addr(addr)) { 323 printk(KERN_ERR 324 "Attempt to assign an invalid ethernet address to a " 325 "device disallowed\n"); 326 goto random; 327 } 328 if (!is_local_ether_addr(addr)) { 329 printk(KERN_WARNING 330 "Warning: Assigning a globally valid ethernet " 331 "address to a device\n"); 332 printk(KERN_WARNING "You should set the 2nd rightmost bit in " 333 "the first byte of the MAC,\n"); 334 printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n", 335 addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4], 336 addr[5]); 337 } 338 return; 339 340 random: 341 printk(KERN_INFO 342 "Choosing a random ethernet address for device %s\n", dev->name); 343 eth_hw_addr_random(dev); 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; 395 396 size = transport->private_size + sizeof(struct uml_net_private); 397 398 device = kzalloc(sizeof(*device), GFP_KERNEL); 399 if (device == NULL) { 400 printk(KERN_ERR "eth_configure failed to allocate struct " 401 "uml_net\n"); 402 return; 403 } 404 405 dev = alloc_etherdev(size); 406 if (dev == NULL) { 407 printk(KERN_ERR "eth_configure: failed to allocate struct " 408 "net_device for eth%d\n", n); 409 goto out_free_device; 410 } 411 412 INIT_LIST_HEAD(&device->list); 413 device->index = n; 414 415 /* If this name ends up conflicting with an existing registered 416 * netdevice, that is OK, register_netdev{,ice}() will notice this 417 * and fail. 418 */ 419 snprintf(dev->name, sizeof(dev->name), "eth%d", n); 420 421 setup_etheraddr(dev, mac); 422 423 printk(KERN_INFO "Netdevice %d (%pM) : ", n, dev->dev_addr); 424 425 lp = netdev_priv(dev); 426 /* This points to the transport private data. It's still clear, but we 427 * must memset it to 0 *now*. Let's help the drivers. */ 428 memset(lp, 0, size); 429 INIT_WORK(&lp->work, uml_dev_close); 430 431 /* sysfs register */ 432 if (!driver_registered) { 433 platform_driver_register(¨_net_driver); 434 driver_registered = 1; 435 } 436 device->pdev.id = n; 437 device->pdev.name = DRIVER_NAME; 438 device->pdev.dev.release = net_device_release; 439 dev_set_drvdata(&device->pdev.dev, device); 440 if (platform_device_register(&device->pdev)) 441 goto out_free_netdev; 442 SET_NETDEV_DEV(dev,&device->pdev.dev); 443 444 device->dev = dev; 445 446 /* 447 * These just fill in a data structure, so there's no failure 448 * to be worried about. 449 */ 450 (*transport->kern->init)(dev, init); 451 452 *lp = ((struct uml_net_private) 453 { .list = LIST_HEAD_INIT(lp->list), 454 .dev = dev, 455 .fd = -1, 456 .mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0}, 457 .max_packet = transport->user->max_packet, 458 .protocol = transport->kern->protocol, 459 .open = transport->user->open, 460 .close = transport->user->close, 461 .remove = transport->user->remove, 462 .read = transport->kern->read, 463 .write = transport->kern->write, 464 .add_address = transport->user->add_address, 465 .delete_address = transport->user->delete_address }); 466 467 init_timer(&lp->tl); 468 spin_lock_init(&lp->lock); 469 lp->tl.function = uml_net_user_timer_expire; 470 memcpy(lp->mac, dev->dev_addr, sizeof(lp->mac)); 471 472 if ((transport->user->init != NULL) && 473 ((*transport->user->init)(&lp->user, dev) != 0)) 474 goto out_unregister; 475 476 dev->mtu = transport->user->mtu; 477 dev->netdev_ops = ¨_netdev_ops; 478 dev->ethtool_ops = ¨_net_ethtool_ops; 479 dev->watchdog_timeo = (HZ >> 1); 480 dev->irq = UM_ETH_IRQ; 481 482 err = update_drop_skb(lp->max_packet); 483 if (err) 484 goto out_undo_user_init; 485 486 rtnl_lock(); 487 err = register_netdevice(dev); 488 rtnl_unlock(); 489 if (err) 490 goto out_undo_user_init; 491 492 spin_lock(&devices_lock); 493 list_add(&device->list, &devices); 494 spin_unlock(&devices_lock); 495 496 return; 497 498 out_undo_user_init: 499 if (transport->user->remove != NULL) 500 (*transport->user->remove)(&lp->user); 501 out_unregister: 502 platform_device_unregister(&device->pdev); 503 return; /* platform_device_unregister frees dev and device */ 504 out_free_netdev: 505 free_netdev(dev); 506 out_free_device: 507 kfree(device); 508 } 509 510 static struct uml_net *find_device(int n) 511 { 512 struct uml_net *device; 513 struct list_head *ele; 514 515 spin_lock(&devices_lock); 516 list_for_each(ele, &devices) { 517 device = list_entry(ele, struct uml_net, list); 518 if (device->index == n) 519 goto out; 520 } 521 device = NULL; 522 out: 523 spin_unlock(&devices_lock); 524 return device; 525 } 526 527 static int eth_parse(char *str, int *index_out, char **str_out, 528 char **error_out) 529 { 530 char *end; 531 int n, err = -EINVAL; 532 533 n = simple_strtoul(str, &end, 0); 534 if (end == str) { 535 *error_out = "Bad device number"; 536 return err; 537 } 538 539 str = end; 540 if (*str != '=') { 541 *error_out = "Expected '=' after device number"; 542 return err; 543 } 544 545 str++; 546 if (find_device(n)) { 547 *error_out = "Device already configured"; 548 return err; 549 } 550 551 *index_out = n; 552 *str_out = str; 553 return 0; 554 } 555 556 struct eth_init { 557 struct list_head list; 558 char *init; 559 int index; 560 }; 561 562 static DEFINE_SPINLOCK(transports_lock); 563 static LIST_HEAD(transports); 564 565 /* Filled in during early boot */ 566 static LIST_HEAD(eth_cmd_line); 567 568 static int check_transport(struct transport *transport, char *eth, int n, 569 void **init_out, char **mac_out) 570 { 571 int len; 572 573 len = strlen(transport->name); 574 if (strncmp(eth, transport->name, len)) 575 return 0; 576 577 eth += len; 578 if (*eth == ',') 579 eth++; 580 else if (*eth != '\0') 581 return 0; 582 583 *init_out = kmalloc(transport->setup_size, GFP_KERNEL); 584 if (*init_out == NULL) 585 return 1; 586 587 if (!transport->setup(eth, mac_out, *init_out)) { 588 kfree(*init_out); 589 *init_out = NULL; 590 } 591 return 1; 592 } 593 594 void register_transport(struct transport *new) 595 { 596 struct list_head *ele, *next; 597 struct eth_init *eth; 598 void *init; 599 char *mac = NULL; 600 int match; 601 602 spin_lock(&transports_lock); 603 BUG_ON(!list_empty(&new->list)); 604 list_add(&new->list, &transports); 605 spin_unlock(&transports_lock); 606 607 list_for_each_safe(ele, next, ð_cmd_line) { 608 eth = list_entry(ele, struct eth_init, list); 609 match = check_transport(new, eth->init, eth->index, &init, 610 &mac); 611 if (!match) 612 continue; 613 else if (init != NULL) { 614 eth_configure(eth->index, init, mac, new); 615 kfree(init); 616 } 617 list_del(ð->list); 618 } 619 } 620 621 static int eth_setup_common(char *str, int index) 622 { 623 struct list_head *ele; 624 struct transport *transport; 625 void *init; 626 char *mac = NULL; 627 int found = 0; 628 629 spin_lock(&transports_lock); 630 list_for_each(ele, &transports) { 631 transport = list_entry(ele, struct transport, list); 632 if (!check_transport(transport, str, index, &init, &mac)) 633 continue; 634 if (init != NULL) { 635 eth_configure(index, init, mac, transport); 636 kfree(init); 637 } 638 found = 1; 639 break; 640 } 641 642 spin_unlock(&transports_lock); 643 return found; 644 } 645 646 static int __init eth_setup(char *str) 647 { 648 struct eth_init *new; 649 char *error; 650 int n, err; 651 652 err = eth_parse(str, &n, &str, &error); 653 if (err) { 654 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n", 655 str, error); 656 return 1; 657 } 658 659 new = alloc_bootmem(sizeof(*new)); 660 if (new == NULL) { 661 printk(KERN_ERR "eth_init : alloc_bootmem failed\n"); 662 return 1; 663 } 664 665 INIT_LIST_HEAD(&new->list); 666 new->index = n; 667 new->init = str; 668 669 list_add_tail(&new->list, ð_cmd_line); 670 return 1; 671 } 672 673 __setup("eth", eth_setup); 674 __uml_help(eth_setup, 675 "eth[0-9]+=<transport>,<options>\n" 676 " Configure a network device.\n\n" 677 ); 678 679 static int net_config(char *str, char **error_out) 680 { 681 int n, err; 682 683 err = eth_parse(str, &n, &str, error_out); 684 if (err) 685 return err; 686 687 /* This string is broken up and the pieces used by the underlying 688 * driver. So, it is freed only if eth_setup_common fails. 689 */ 690 str = kstrdup(str, GFP_KERNEL); 691 if (str == NULL) { 692 *error_out = "net_config failed to strdup string"; 693 return -ENOMEM; 694 } 695 err = !eth_setup_common(str, n); 696 if (err) 697 kfree(str); 698 return err; 699 } 700 701 static int net_id(char **str, int *start_out, int *end_out) 702 { 703 char *end; 704 int n; 705 706 n = simple_strtoul(*str, &end, 0); 707 if ((*end != '\0') || (end == *str)) 708 return -1; 709 710 *start_out = n; 711 *end_out = n; 712 *str = end; 713 return n; 714 } 715 716 static int net_remove(int n, char **error_out) 717 { 718 struct uml_net *device; 719 struct net_device *dev; 720 struct uml_net_private *lp; 721 722 device = find_device(n); 723 if (device == NULL) 724 return -ENODEV; 725 726 dev = device->dev; 727 lp = netdev_priv(dev); 728 if (lp->fd > 0) 729 return -EBUSY; 730 unregister_netdev(dev); 731 platform_device_unregister(&device->pdev); 732 733 return 0; 734 } 735 736 static struct mc_device net_mc = { 737 .list = LIST_HEAD_INIT(net_mc.list), 738 .name = "eth", 739 .config = net_config, 740 .get_config = NULL, 741 .id = net_id, 742 .remove = net_remove, 743 }; 744 745 #ifdef CONFIG_INET 746 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event, 747 void *ptr) 748 { 749 struct in_ifaddr *ifa = ptr; 750 struct net_device *dev = ifa->ifa_dev->dev; 751 struct uml_net_private *lp; 752 void (*proc)(unsigned char *, unsigned char *, void *); 753 unsigned char addr_buf[4], netmask_buf[4]; 754 755 if (dev->netdev_ops->ndo_open != uml_net_open) 756 return NOTIFY_DONE; 757 758 lp = netdev_priv(dev); 759 760 proc = NULL; 761 switch (event) { 762 case NETDEV_UP: 763 proc = lp->add_address; 764 break; 765 case NETDEV_DOWN: 766 proc = lp->delete_address; 767 break; 768 } 769 if (proc != NULL) { 770 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf)); 771 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf)); 772 (*proc)(addr_buf, netmask_buf, &lp->user); 773 } 774 return NOTIFY_DONE; 775 } 776 777 /* uml_net_init shouldn't be called twice on two CPUs at the same time */ 778 static struct notifier_block uml_inetaddr_notifier = { 779 .notifier_call = uml_inetaddr_event, 780 }; 781 782 static void inet_register(void) 783 { 784 struct list_head *ele; 785 struct uml_net_private *lp; 786 struct in_device *ip; 787 struct in_ifaddr *in; 788 789 register_inetaddr_notifier(¨_inetaddr_notifier); 790 791 /* Devices may have been opened already, so the uml_inetaddr_notifier 792 * didn't get a chance to run for them. This fakes it so that 793 * addresses which have already been set up get handled properly. 794 */ 795 spin_lock(&opened_lock); 796 list_for_each(ele, &opened) { 797 lp = list_entry(ele, struct uml_net_private, list); 798 ip = lp->dev->ip_ptr; 799 if (ip == NULL) 800 continue; 801 in = ip->ifa_list; 802 while (in != NULL) { 803 uml_inetaddr_event(NULL, NETDEV_UP, in); 804 in = in->ifa_next; 805 } 806 } 807 spin_unlock(&opened_lock); 808 } 809 #else 810 static inline void inet_register(void) 811 { 812 } 813 #endif 814 815 static int uml_net_init(void) 816 { 817 mconsole_register_dev(&net_mc); 818 inet_register(); 819 return 0; 820 } 821 822 __initcall(uml_net_init); 823 824 static void close_devices(void) 825 { 826 struct list_head *ele; 827 struct uml_net_private *lp; 828 829 spin_lock(&opened_lock); 830 list_for_each(ele, &opened) { 831 lp = list_entry(ele, struct uml_net_private, list); 832 um_free_irq(lp->dev->irq, lp->dev); 833 if ((lp->close != NULL) && (lp->fd >= 0)) 834 (*lp->close)(lp->fd, &lp->user); 835 if (lp->remove != NULL) 836 (*lp->remove)(&lp->user); 837 } 838 spin_unlock(&opened_lock); 839 } 840 841 __uml_exitcall(close_devices); 842 843 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *, 844 void *), 845 void *arg) 846 { 847 struct net_device *dev = d; 848 struct in_device *ip = dev->ip_ptr; 849 struct in_ifaddr *in; 850 unsigned char address[4], netmask[4]; 851 852 if (ip == NULL) return; 853 in = ip->ifa_list; 854 while (in != NULL) { 855 memcpy(address, &in->ifa_address, sizeof(address)); 856 memcpy(netmask, &in->ifa_mask, sizeof(netmask)); 857 (*cb)(address, netmask, arg); 858 in = in->ifa_next; 859 } 860 } 861 862 int dev_netmask(void *d, void *m) 863 { 864 struct net_device *dev = d; 865 struct in_device *ip = dev->ip_ptr; 866 struct in_ifaddr *in; 867 __be32 *mask_out = m; 868 869 if (ip == NULL) 870 return 1; 871 872 in = ip->ifa_list; 873 if (in == NULL) 874 return 1; 875 876 *mask_out = in->ifa_mask; 877 return 0; 878 } 879 880 void *get_output_buffer(int *len_out) 881 { 882 void *ret; 883 884 ret = (void *) __get_free_pages(GFP_KERNEL, 0); 885 if (ret) *len_out = PAGE_SIZE; 886 else *len_out = 0; 887 return ret; 888 } 889 890 void free_output_buffer(void *buffer) 891 { 892 free_pages((unsigned long) buffer, 0); 893 } 894 895 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out, 896 char **gate_addr) 897 { 898 char *remain; 899 900 remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL); 901 if (remain != NULL) { 902 printk(KERN_ERR "tap_setup_common - Extra garbage on " 903 "specification : '%s'\n", remain); 904 return 1; 905 } 906 907 return 0; 908 } 909 910 unsigned short eth_protocol(struct sk_buff *skb) 911 { 912 return eth_type_trans(skb, skb->dev); 913 } 914