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 skb_tx_timestamp(skb); 222 223 if (len == skb->len) { 224 dev->stats.tx_packets++; 225 dev->stats.tx_bytes += skb->len; 226 dev->trans_start = jiffies; 227 netif_start_queue(dev); 228 229 /* this is normally done in the interrupt when tx finishes */ 230 netif_wake_queue(dev); 231 } 232 else if (len == 0) { 233 netif_start_queue(dev); 234 dev->stats.tx_dropped++; 235 } 236 else { 237 netif_start_queue(dev); 238 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len); 239 } 240 241 spin_unlock_irqrestore(&lp->lock, flags); 242 243 dev_consume_skb_any(skb); 244 245 return NETDEV_TX_OK; 246 } 247 248 static void uml_net_set_multicast_list(struct net_device *dev) 249 { 250 return; 251 } 252 253 static void uml_net_tx_timeout(struct net_device *dev) 254 { 255 dev->trans_start = jiffies; 256 netif_wake_queue(dev); 257 } 258 259 static int uml_net_change_mtu(struct net_device *dev, int new_mtu) 260 { 261 dev->mtu = new_mtu; 262 263 return 0; 264 } 265 266 #ifdef CONFIG_NET_POLL_CONTROLLER 267 static void uml_net_poll_controller(struct net_device *dev) 268 { 269 disable_irq(dev->irq); 270 uml_net_interrupt(dev->irq, dev); 271 enable_irq(dev->irq); 272 } 273 #endif 274 275 static void uml_net_get_drvinfo(struct net_device *dev, 276 struct ethtool_drvinfo *info) 277 { 278 strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver)); 279 strlcpy(info->version, "42", sizeof(info->version)); 280 } 281 282 static const struct ethtool_ops uml_net_ethtool_ops = { 283 .get_drvinfo = uml_net_get_drvinfo, 284 .get_link = ethtool_op_get_link, 285 .get_ts_info = ethtool_op_get_ts_info, 286 }; 287 288 static void uml_net_user_timer_expire(unsigned long _conn) 289 { 290 #ifdef undef 291 struct connection *conn = (struct connection *)_conn; 292 293 dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn); 294 do_connect(conn); 295 #endif 296 } 297 298 static void setup_etheraddr(struct net_device *dev, char *str) 299 { 300 unsigned char *addr = dev->dev_addr; 301 char *end; 302 int i; 303 304 if (str == NULL) 305 goto random; 306 307 for (i = 0; i < 6; i++) { 308 addr[i] = simple_strtoul(str, &end, 16); 309 if ((end == str) || 310 ((*end != ':') && (*end != ',') && (*end != '\0'))) { 311 printk(KERN_ERR 312 "setup_etheraddr: failed to parse '%s' " 313 "as an ethernet address\n", str); 314 goto random; 315 } 316 str = end + 1; 317 } 318 if (is_multicast_ether_addr(addr)) { 319 printk(KERN_ERR 320 "Attempt to assign a multicast ethernet address to a " 321 "device disallowed\n"); 322 goto random; 323 } 324 if (!is_valid_ether_addr(addr)) { 325 printk(KERN_ERR 326 "Attempt to assign an invalid ethernet address to a " 327 "device disallowed\n"); 328 goto random; 329 } 330 if (!is_local_ether_addr(addr)) { 331 printk(KERN_WARNING 332 "Warning: Assigning a globally valid ethernet " 333 "address to a device\n"); 334 printk(KERN_WARNING "You should set the 2nd rightmost bit in " 335 "the first byte of the MAC,\n"); 336 printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n", 337 addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4], 338 addr[5]); 339 } 340 return; 341 342 random: 343 printk(KERN_INFO 344 "Choosing a random ethernet address for device %s\n", dev->name); 345 eth_hw_addr_random(dev); 346 } 347 348 static DEFINE_SPINLOCK(devices_lock); 349 static LIST_HEAD(devices); 350 351 static struct platform_driver uml_net_driver = { 352 .driver = { 353 .name = DRIVER_NAME, 354 }, 355 }; 356 357 static void net_device_release(struct device *dev) 358 { 359 struct uml_net *device = dev_get_drvdata(dev); 360 struct net_device *netdev = device->dev; 361 struct uml_net_private *lp = netdev_priv(netdev); 362 363 if (lp->remove != NULL) 364 (*lp->remove)(&lp->user); 365 list_del(&device->list); 366 kfree(device); 367 free_netdev(netdev); 368 } 369 370 static const struct net_device_ops uml_netdev_ops = { 371 .ndo_open = uml_net_open, 372 .ndo_stop = uml_net_close, 373 .ndo_start_xmit = uml_net_start_xmit, 374 .ndo_set_rx_mode = uml_net_set_multicast_list, 375 .ndo_tx_timeout = uml_net_tx_timeout, 376 .ndo_set_mac_address = eth_mac_addr, 377 .ndo_change_mtu = uml_net_change_mtu, 378 .ndo_validate_addr = eth_validate_addr, 379 #ifdef CONFIG_NET_POLL_CONTROLLER 380 .ndo_poll_controller = uml_net_poll_controller, 381 #endif 382 }; 383 384 /* 385 * Ensures that platform_driver_register is called only once by 386 * eth_configure. Will be set in an initcall. 387 */ 388 static int driver_registered; 389 390 static void eth_configure(int n, void *init, char *mac, 391 struct transport *transport) 392 { 393 struct uml_net *device; 394 struct net_device *dev; 395 struct uml_net_private *lp; 396 int err, size; 397 398 size = transport->private_size + sizeof(struct uml_net_private); 399 400 device = kzalloc(sizeof(*device), GFP_KERNEL); 401 if (device == NULL) { 402 printk(KERN_ERR "eth_configure failed to allocate struct " 403 "uml_net\n"); 404 return; 405 } 406 407 dev = alloc_etherdev(size); 408 if (dev == NULL) { 409 printk(KERN_ERR "eth_configure: failed to allocate struct " 410 "net_device for eth%d\n", n); 411 goto out_free_device; 412 } 413 414 INIT_LIST_HEAD(&device->list); 415 device->index = n; 416 417 /* If this name ends up conflicting with an existing registered 418 * netdevice, that is OK, register_netdev{,ice}() will notice this 419 * and fail. 420 */ 421 snprintf(dev->name, sizeof(dev->name), "eth%d", n); 422 423 setup_etheraddr(dev, mac); 424 425 printk(KERN_INFO "Netdevice %d (%pM) : ", n, dev->dev_addr); 426 427 lp = netdev_priv(dev); 428 /* This points to the transport private data. It's still clear, but we 429 * must memset it to 0 *now*. Let's help the drivers. */ 430 memset(lp, 0, size); 431 INIT_WORK(&lp->work, uml_dev_close); 432 433 /* sysfs register */ 434 if (!driver_registered) { 435 platform_driver_register(¨_net_driver); 436 driver_registered = 1; 437 } 438 device->pdev.id = n; 439 device->pdev.name = DRIVER_NAME; 440 device->pdev.dev.release = net_device_release; 441 dev_set_drvdata(&device->pdev.dev, device); 442 if (platform_device_register(&device->pdev)) 443 goto out_free_netdev; 444 SET_NETDEV_DEV(dev,&device->pdev.dev); 445 446 device->dev = dev; 447 448 /* 449 * These just fill in a data structure, so there's no failure 450 * to be worried about. 451 */ 452 (*transport->kern->init)(dev, init); 453 454 *lp = ((struct uml_net_private) 455 { .list = LIST_HEAD_INIT(lp->list), 456 .dev = dev, 457 .fd = -1, 458 .mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0}, 459 .max_packet = transport->user->max_packet, 460 .protocol = transport->kern->protocol, 461 .open = transport->user->open, 462 .close = transport->user->close, 463 .remove = transport->user->remove, 464 .read = transport->kern->read, 465 .write = transport->kern->write, 466 .add_address = transport->user->add_address, 467 .delete_address = transport->user->delete_address }); 468 469 init_timer(&lp->tl); 470 spin_lock_init(&lp->lock); 471 lp->tl.function = uml_net_user_timer_expire; 472 memcpy(lp->mac, dev->dev_addr, sizeof(lp->mac)); 473 474 if ((transport->user->init != NULL) && 475 ((*transport->user->init)(&lp->user, dev) != 0)) 476 goto out_unregister; 477 478 dev->mtu = transport->user->mtu; 479 dev->netdev_ops = ¨_netdev_ops; 480 dev->ethtool_ops = ¨_net_ethtool_ops; 481 dev->watchdog_timeo = (HZ >> 1); 482 dev->irq = UM_ETH_IRQ; 483 484 err = update_drop_skb(lp->max_packet); 485 if (err) 486 goto out_undo_user_init; 487 488 rtnl_lock(); 489 err = register_netdevice(dev); 490 rtnl_unlock(); 491 if (err) 492 goto out_undo_user_init; 493 494 spin_lock(&devices_lock); 495 list_add(&device->list, &devices); 496 spin_unlock(&devices_lock); 497 498 return; 499 500 out_undo_user_init: 501 if (transport->user->remove != NULL) 502 (*transport->user->remove)(&lp->user); 503 out_unregister: 504 platform_device_unregister(&device->pdev); 505 return; /* platform_device_unregister frees dev and device */ 506 out_free_netdev: 507 free_netdev(dev); 508 out_free_device: 509 kfree(device); 510 } 511 512 static struct uml_net *find_device(int n) 513 { 514 struct uml_net *device; 515 struct list_head *ele; 516 517 spin_lock(&devices_lock); 518 list_for_each(ele, &devices) { 519 device = list_entry(ele, struct uml_net, list); 520 if (device->index == n) 521 goto out; 522 } 523 device = NULL; 524 out: 525 spin_unlock(&devices_lock); 526 return device; 527 } 528 529 static int eth_parse(char *str, int *index_out, char **str_out, 530 char **error_out) 531 { 532 char *end; 533 int n, err = -EINVAL; 534 535 n = simple_strtoul(str, &end, 0); 536 if (end == str) { 537 *error_out = "Bad device number"; 538 return err; 539 } 540 541 str = end; 542 if (*str != '=') { 543 *error_out = "Expected '=' after device number"; 544 return err; 545 } 546 547 str++; 548 if (find_device(n)) { 549 *error_out = "Device already configured"; 550 return err; 551 } 552 553 *index_out = n; 554 *str_out = str; 555 return 0; 556 } 557 558 struct eth_init { 559 struct list_head list; 560 char *init; 561 int index; 562 }; 563 564 static DEFINE_SPINLOCK(transports_lock); 565 static LIST_HEAD(transports); 566 567 /* Filled in during early boot */ 568 static LIST_HEAD(eth_cmd_line); 569 570 static int check_transport(struct transport *transport, char *eth, int n, 571 void **init_out, char **mac_out) 572 { 573 int len; 574 575 len = strlen(transport->name); 576 if (strncmp(eth, transport->name, len)) 577 return 0; 578 579 eth += len; 580 if (*eth == ',') 581 eth++; 582 else if (*eth != '\0') 583 return 0; 584 585 *init_out = kmalloc(transport->setup_size, GFP_KERNEL); 586 if (*init_out == NULL) 587 return 1; 588 589 if (!transport->setup(eth, mac_out, *init_out)) { 590 kfree(*init_out); 591 *init_out = NULL; 592 } 593 return 1; 594 } 595 596 void register_transport(struct transport *new) 597 { 598 struct list_head *ele, *next; 599 struct eth_init *eth; 600 void *init; 601 char *mac = NULL; 602 int match; 603 604 spin_lock(&transports_lock); 605 BUG_ON(!list_empty(&new->list)); 606 list_add(&new->list, &transports); 607 spin_unlock(&transports_lock); 608 609 list_for_each_safe(ele, next, ð_cmd_line) { 610 eth = list_entry(ele, struct eth_init, list); 611 match = check_transport(new, eth->init, eth->index, &init, 612 &mac); 613 if (!match) 614 continue; 615 else if (init != NULL) { 616 eth_configure(eth->index, init, mac, new); 617 kfree(init); 618 } 619 list_del(ð->list); 620 } 621 } 622 623 static int eth_setup_common(char *str, int index) 624 { 625 struct list_head *ele; 626 struct transport *transport; 627 void *init; 628 char *mac = NULL; 629 int found = 0; 630 631 spin_lock(&transports_lock); 632 list_for_each(ele, &transports) { 633 transport = list_entry(ele, struct transport, list); 634 if (!check_transport(transport, str, index, &init, &mac)) 635 continue; 636 if (init != NULL) { 637 eth_configure(index, init, mac, transport); 638 kfree(init); 639 } 640 found = 1; 641 break; 642 } 643 644 spin_unlock(&transports_lock); 645 return found; 646 } 647 648 static int __init eth_setup(char *str) 649 { 650 struct eth_init *new; 651 char *error; 652 int n, err; 653 654 err = eth_parse(str, &n, &str, &error); 655 if (err) { 656 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n", 657 str, error); 658 return 1; 659 } 660 661 new = alloc_bootmem(sizeof(*new)); 662 663 INIT_LIST_HEAD(&new->list); 664 new->index = n; 665 new->init = str; 666 667 list_add_tail(&new->list, ð_cmd_line); 668 return 1; 669 } 670 671 __setup("eth", eth_setup); 672 __uml_help(eth_setup, 673 "eth[0-9]+=<transport>,<options>\n" 674 " Configure a network device.\n\n" 675 ); 676 677 static int net_config(char *str, char **error_out) 678 { 679 int n, err; 680 681 err = eth_parse(str, &n, &str, error_out); 682 if (err) 683 return err; 684 685 /* This string is broken up and the pieces used by the underlying 686 * driver. So, it is freed only if eth_setup_common fails. 687 */ 688 str = kstrdup(str, GFP_KERNEL); 689 if (str == NULL) { 690 *error_out = "net_config failed to strdup string"; 691 return -ENOMEM; 692 } 693 err = !eth_setup_common(str, n); 694 if (err) 695 kfree(str); 696 return err; 697 } 698 699 static int net_id(char **str, int *start_out, int *end_out) 700 { 701 char *end; 702 int n; 703 704 n = simple_strtoul(*str, &end, 0); 705 if ((*end != '\0') || (end == *str)) 706 return -1; 707 708 *start_out = n; 709 *end_out = n; 710 *str = end; 711 return n; 712 } 713 714 static int net_remove(int n, char **error_out) 715 { 716 struct uml_net *device; 717 struct net_device *dev; 718 struct uml_net_private *lp; 719 720 device = find_device(n); 721 if (device == NULL) 722 return -ENODEV; 723 724 dev = device->dev; 725 lp = netdev_priv(dev); 726 if (lp->fd > 0) 727 return -EBUSY; 728 unregister_netdev(dev); 729 platform_device_unregister(&device->pdev); 730 731 return 0; 732 } 733 734 static struct mc_device net_mc = { 735 .list = LIST_HEAD_INIT(net_mc.list), 736 .name = "eth", 737 .config = net_config, 738 .get_config = NULL, 739 .id = net_id, 740 .remove = net_remove, 741 }; 742 743 #ifdef CONFIG_INET 744 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event, 745 void *ptr) 746 { 747 struct in_ifaddr *ifa = ptr; 748 struct net_device *dev = ifa->ifa_dev->dev; 749 struct uml_net_private *lp; 750 void (*proc)(unsigned char *, unsigned char *, void *); 751 unsigned char addr_buf[4], netmask_buf[4]; 752 753 if (dev->netdev_ops->ndo_open != uml_net_open) 754 return NOTIFY_DONE; 755 756 lp = netdev_priv(dev); 757 758 proc = NULL; 759 switch (event) { 760 case NETDEV_UP: 761 proc = lp->add_address; 762 break; 763 case NETDEV_DOWN: 764 proc = lp->delete_address; 765 break; 766 } 767 if (proc != NULL) { 768 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf)); 769 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf)); 770 (*proc)(addr_buf, netmask_buf, &lp->user); 771 } 772 return NOTIFY_DONE; 773 } 774 775 /* uml_net_init shouldn't be called twice on two CPUs at the same time */ 776 static struct notifier_block uml_inetaddr_notifier = { 777 .notifier_call = uml_inetaddr_event, 778 }; 779 780 static void inet_register(void) 781 { 782 struct list_head *ele; 783 struct uml_net_private *lp; 784 struct in_device *ip; 785 struct in_ifaddr *in; 786 787 register_inetaddr_notifier(¨_inetaddr_notifier); 788 789 /* Devices may have been opened already, so the uml_inetaddr_notifier 790 * didn't get a chance to run for them. This fakes it so that 791 * addresses which have already been set up get handled properly. 792 */ 793 spin_lock(&opened_lock); 794 list_for_each(ele, &opened) { 795 lp = list_entry(ele, struct uml_net_private, list); 796 ip = lp->dev->ip_ptr; 797 if (ip == NULL) 798 continue; 799 in = ip->ifa_list; 800 while (in != NULL) { 801 uml_inetaddr_event(NULL, NETDEV_UP, in); 802 in = in->ifa_next; 803 } 804 } 805 spin_unlock(&opened_lock); 806 } 807 #else 808 static inline void inet_register(void) 809 { 810 } 811 #endif 812 813 static int uml_net_init(void) 814 { 815 mconsole_register_dev(&net_mc); 816 inet_register(); 817 return 0; 818 } 819 820 __initcall(uml_net_init); 821 822 static void close_devices(void) 823 { 824 struct list_head *ele; 825 struct uml_net_private *lp; 826 827 spin_lock(&opened_lock); 828 list_for_each(ele, &opened) { 829 lp = list_entry(ele, struct uml_net_private, list); 830 um_free_irq(lp->dev->irq, lp->dev); 831 if ((lp->close != NULL) && (lp->fd >= 0)) 832 (*lp->close)(lp->fd, &lp->user); 833 if (lp->remove != NULL) 834 (*lp->remove)(&lp->user); 835 } 836 spin_unlock(&opened_lock); 837 } 838 839 __uml_exitcall(close_devices); 840 841 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *, 842 void *), 843 void *arg) 844 { 845 struct net_device *dev = d; 846 struct in_device *ip = dev->ip_ptr; 847 struct in_ifaddr *in; 848 unsigned char address[4], netmask[4]; 849 850 if (ip == NULL) return; 851 in = ip->ifa_list; 852 while (in != NULL) { 853 memcpy(address, &in->ifa_address, sizeof(address)); 854 memcpy(netmask, &in->ifa_mask, sizeof(netmask)); 855 (*cb)(address, netmask, arg); 856 in = in->ifa_next; 857 } 858 } 859 860 int dev_netmask(void *d, void *m) 861 { 862 struct net_device *dev = d; 863 struct in_device *ip = dev->ip_ptr; 864 struct in_ifaddr *in; 865 __be32 *mask_out = m; 866 867 if (ip == NULL) 868 return 1; 869 870 in = ip->ifa_list; 871 if (in == NULL) 872 return 1; 873 874 *mask_out = in->ifa_mask; 875 return 0; 876 } 877 878 void *get_output_buffer(int *len_out) 879 { 880 void *ret; 881 882 ret = (void *) __get_free_pages(GFP_KERNEL, 0); 883 if (ret) *len_out = PAGE_SIZE; 884 else *len_out = 0; 885 return ret; 886 } 887 888 void free_output_buffer(void *buffer) 889 { 890 free_pages((unsigned long) buffer, 0); 891 } 892 893 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out, 894 char **gate_addr) 895 { 896 char *remain; 897 898 remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL); 899 if (remain != NULL) { 900 printk(KERN_ERR "tap_setup_common - Extra garbage on " 901 "specification : '%s'\n", remain); 902 return 1; 903 } 904 905 return 0; 906 } 907 908 unsigned short eth_protocol(struct sk_buff *skb) 909 { 910 return eth_type_trans(skb, skb->dev); 911 } 912