1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) 4 * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and 5 * James Leu (jleu@mindspring.net). 6 * Copyright (C) 2001 by various other people who didn't put their name here. 7 */ 8 9 #include <linux/memblock.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 out: 141 spin_unlock(&lp->lock); 142 return IRQ_HANDLED; 143 } 144 145 static int uml_net_open(struct net_device *dev) 146 { 147 struct uml_net_private *lp = netdev_priv(dev); 148 int err; 149 150 if (lp->fd >= 0) { 151 err = -ENXIO; 152 goto out; 153 } 154 155 lp->fd = (*lp->open)(&lp->user); 156 if (lp->fd < 0) { 157 err = lp->fd; 158 goto out; 159 } 160 161 err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt, 162 IRQF_SHARED, dev->name, dev); 163 if (err < 0) { 164 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err); 165 err = -ENETUNREACH; 166 goto out_close; 167 } 168 169 netif_start_queue(dev); 170 171 /* clear buffer - it can happen that the host side of the interface 172 * is full when we get here. In this case, new data is never queued, 173 * SIGIOs never arrive, and the net never works. 174 */ 175 while ((err = uml_net_rx(dev)) > 0) ; 176 177 spin_lock(&opened_lock); 178 list_add(&lp->list, &opened); 179 spin_unlock(&opened_lock); 180 181 return 0; 182 out_close: 183 if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user); 184 lp->fd = -1; 185 out: 186 return err; 187 } 188 189 static int uml_net_close(struct net_device *dev) 190 { 191 struct uml_net_private *lp = netdev_priv(dev); 192 193 netif_stop_queue(dev); 194 195 um_free_irq(dev->irq, dev); 196 if (lp->close != NULL) 197 (*lp->close)(lp->fd, &lp->user); 198 lp->fd = -1; 199 200 spin_lock(&opened_lock); 201 list_del(&lp->list); 202 spin_unlock(&opened_lock); 203 204 return 0; 205 } 206 207 static netdev_tx_t uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev) 208 { 209 struct uml_net_private *lp = netdev_priv(dev); 210 unsigned long flags; 211 int len; 212 213 netif_stop_queue(dev); 214 215 spin_lock_irqsave(&lp->lock, flags); 216 217 len = (*lp->write)(lp->fd, skb, lp); 218 skb_tx_timestamp(skb); 219 220 if (len == skb->len) { 221 dev->stats.tx_packets++; 222 dev->stats.tx_bytes += skb->len; 223 netif_trans_update(dev); 224 netif_start_queue(dev); 225 226 /* this is normally done in the interrupt when tx finishes */ 227 netif_wake_queue(dev); 228 } 229 else if (len == 0) { 230 netif_start_queue(dev); 231 dev->stats.tx_dropped++; 232 } 233 else { 234 netif_start_queue(dev); 235 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len); 236 } 237 238 spin_unlock_irqrestore(&lp->lock, flags); 239 240 dev_consume_skb_any(skb); 241 242 return NETDEV_TX_OK; 243 } 244 245 static void uml_net_set_multicast_list(struct net_device *dev) 246 { 247 return; 248 } 249 250 static void uml_net_tx_timeout(struct net_device *dev, unsigned int txqueue) 251 { 252 netif_trans_update(dev); 253 netif_wake_queue(dev); 254 } 255 256 #ifdef CONFIG_NET_POLL_CONTROLLER 257 static void uml_net_poll_controller(struct net_device *dev) 258 { 259 disable_irq(dev->irq); 260 uml_net_interrupt(dev->irq, dev); 261 enable_irq(dev->irq); 262 } 263 #endif 264 265 static void uml_net_get_drvinfo(struct net_device *dev, 266 struct ethtool_drvinfo *info) 267 { 268 strscpy(info->driver, DRIVER_NAME); 269 } 270 271 static const struct ethtool_ops uml_net_ethtool_ops = { 272 .get_drvinfo = uml_net_get_drvinfo, 273 .get_link = ethtool_op_get_link, 274 .get_ts_info = ethtool_op_get_ts_info, 275 }; 276 277 void uml_net_setup_etheraddr(struct net_device *dev, char *str) 278 { 279 u8 addr[ETH_ALEN]; 280 char *end; 281 int i; 282 283 if (str == NULL) 284 goto random; 285 286 for (i = 0; i < 6; i++) { 287 addr[i] = simple_strtoul(str, &end, 16); 288 if ((end == str) || 289 ((*end != ':') && (*end != ',') && (*end != '\0'))) { 290 printk(KERN_ERR 291 "setup_etheraddr: failed to parse '%s' " 292 "as an ethernet address\n", str); 293 goto random; 294 } 295 str = end + 1; 296 } 297 if (is_multicast_ether_addr(addr)) { 298 printk(KERN_ERR 299 "Attempt to assign a multicast ethernet address to a " 300 "device disallowed\n"); 301 goto random; 302 } 303 if (!is_valid_ether_addr(addr)) { 304 printk(KERN_ERR 305 "Attempt to assign an invalid ethernet address to a " 306 "device disallowed\n"); 307 goto random; 308 } 309 if (!is_local_ether_addr(addr)) { 310 printk(KERN_WARNING 311 "Warning: Assigning a globally valid ethernet " 312 "address to a device\n"); 313 printk(KERN_WARNING "You should set the 2nd rightmost bit in " 314 "the first byte of the MAC,\n"); 315 printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n", 316 addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4], 317 addr[5]); 318 } 319 eth_hw_addr_set(dev, addr); 320 return; 321 322 random: 323 printk(KERN_INFO 324 "Choosing a random ethernet address for device %s\n", dev->name); 325 eth_hw_addr_random(dev); 326 } 327 328 static DEFINE_SPINLOCK(devices_lock); 329 static LIST_HEAD(devices); 330 331 static struct platform_driver uml_net_driver = { 332 .driver = { 333 .name = DRIVER_NAME, 334 }, 335 }; 336 337 static void net_device_release(struct device *dev) 338 { 339 struct uml_net *device = dev_get_drvdata(dev); 340 struct net_device *netdev = device->dev; 341 struct uml_net_private *lp = netdev_priv(netdev); 342 343 if (lp->remove != NULL) 344 (*lp->remove)(&lp->user); 345 list_del(&device->list); 346 kfree(device); 347 free_netdev(netdev); 348 } 349 350 static const struct net_device_ops uml_netdev_ops = { 351 .ndo_open = uml_net_open, 352 .ndo_stop = uml_net_close, 353 .ndo_start_xmit = uml_net_start_xmit, 354 .ndo_set_rx_mode = uml_net_set_multicast_list, 355 .ndo_tx_timeout = uml_net_tx_timeout, 356 .ndo_set_mac_address = eth_mac_addr, 357 .ndo_validate_addr = eth_validate_addr, 358 #ifdef CONFIG_NET_POLL_CONTROLLER 359 .ndo_poll_controller = uml_net_poll_controller, 360 #endif 361 }; 362 363 /* 364 * Ensures that platform_driver_register is called only once by 365 * eth_configure. Will be set in an initcall. 366 */ 367 static int driver_registered; 368 369 static void eth_configure(int n, void *init, char *mac, 370 struct transport *transport, gfp_t gfp_mask) 371 { 372 struct uml_net *device; 373 struct net_device *dev; 374 struct uml_net_private *lp; 375 int err, size; 376 377 size = transport->private_size + sizeof(struct uml_net_private); 378 379 device = kzalloc(sizeof(*device), gfp_mask); 380 if (device == NULL) { 381 printk(KERN_ERR "eth_configure failed to allocate struct " 382 "uml_net\n"); 383 return; 384 } 385 386 dev = alloc_etherdev(size); 387 if (dev == NULL) { 388 printk(KERN_ERR "eth_configure: failed to allocate struct " 389 "net_device for eth%d\n", n); 390 goto out_free_device; 391 } 392 393 INIT_LIST_HEAD(&device->list); 394 device->index = n; 395 396 /* If this name ends up conflicting with an existing registered 397 * netdevice, that is OK, register_netdev{,ice}() will notice this 398 * and fail. 399 */ 400 snprintf(dev->name, sizeof(dev->name), "eth%d", n); 401 402 uml_net_setup_etheraddr(dev, mac); 403 404 printk(KERN_INFO "Netdevice %d (%pM) : ", n, dev->dev_addr); 405 406 lp = netdev_priv(dev); 407 /* This points to the transport private data. It's still clear, but we 408 * must memset it to 0 *now*. Let's help the drivers. */ 409 memset(lp, 0, size); 410 INIT_WORK(&lp->work, uml_dev_close); 411 412 /* sysfs register */ 413 if (!driver_registered) { 414 platform_driver_register(¨_net_driver); 415 driver_registered = 1; 416 } 417 device->pdev.id = n; 418 device->pdev.name = DRIVER_NAME; 419 device->pdev.dev.release = net_device_release; 420 dev_set_drvdata(&device->pdev.dev, device); 421 if (platform_device_register(&device->pdev)) 422 goto out_free_netdev; 423 SET_NETDEV_DEV(dev,&device->pdev.dev); 424 425 device->dev = dev; 426 427 /* 428 * These just fill in a data structure, so there's no failure 429 * to be worried about. 430 */ 431 (*transport->kern->init)(dev, init); 432 433 *lp = ((struct uml_net_private) 434 { .list = LIST_HEAD_INIT(lp->list), 435 .dev = dev, 436 .fd = -1, 437 .mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0}, 438 .max_packet = transport->user->max_packet, 439 .protocol = transport->kern->protocol, 440 .open = transport->user->open, 441 .close = transport->user->close, 442 .remove = transport->user->remove, 443 .read = transport->kern->read, 444 .write = transport->kern->write, 445 .add_address = transport->user->add_address, 446 .delete_address = transport->user->delete_address }); 447 448 spin_lock_init(&lp->lock); 449 memcpy(lp->mac, dev->dev_addr, sizeof(lp->mac)); 450 451 if ((transport->user->init != NULL) && 452 ((*transport->user->init)(&lp->user, dev) != 0)) 453 goto out_unregister; 454 455 dev->mtu = transport->user->mtu; 456 dev->netdev_ops = ¨_netdev_ops; 457 dev->ethtool_ops = ¨_net_ethtool_ops; 458 dev->watchdog_timeo = (HZ >> 1); 459 dev->irq = UM_ETH_IRQ; 460 461 err = update_drop_skb(lp->max_packet); 462 if (err) 463 goto out_undo_user_init; 464 465 rtnl_lock(); 466 err = register_netdevice(dev); 467 rtnl_unlock(); 468 if (err) 469 goto out_undo_user_init; 470 471 spin_lock(&devices_lock); 472 list_add(&device->list, &devices); 473 spin_unlock(&devices_lock); 474 475 return; 476 477 out_undo_user_init: 478 if (transport->user->remove != NULL) 479 (*transport->user->remove)(&lp->user); 480 out_unregister: 481 platform_device_unregister(&device->pdev); 482 return; /* platform_device_unregister frees dev and device */ 483 out_free_netdev: 484 free_netdev(dev); 485 out_free_device: 486 kfree(device); 487 } 488 489 static struct uml_net *find_device(int n) 490 { 491 struct uml_net *device; 492 struct list_head *ele; 493 494 spin_lock(&devices_lock); 495 list_for_each(ele, &devices) { 496 device = list_entry(ele, struct uml_net, list); 497 if (device->index == n) 498 goto out; 499 } 500 device = NULL; 501 out: 502 spin_unlock(&devices_lock); 503 return device; 504 } 505 506 static int eth_parse(char *str, int *index_out, char **str_out, 507 char **error_out) 508 { 509 char *end; 510 int n, err = -EINVAL; 511 512 n = simple_strtoul(str, &end, 0); 513 if (end == str) { 514 *error_out = "Bad device number"; 515 return err; 516 } 517 518 str = end; 519 if (*str != '=') { 520 *error_out = "Expected '=' after device number"; 521 return err; 522 } 523 524 str++; 525 if (find_device(n)) { 526 *error_out = "Device already configured"; 527 return err; 528 } 529 530 *index_out = n; 531 *str_out = str; 532 return 0; 533 } 534 535 struct eth_init { 536 struct list_head list; 537 char *init; 538 int index; 539 }; 540 541 static DEFINE_SPINLOCK(transports_lock); 542 static LIST_HEAD(transports); 543 544 /* Filled in during early boot */ 545 static LIST_HEAD(eth_cmd_line); 546 547 static int check_transport(struct transport *transport, char *eth, int n, 548 void **init_out, char **mac_out, gfp_t gfp_mask) 549 { 550 int len; 551 552 len = strlen(transport->name); 553 if (strncmp(eth, transport->name, len)) 554 return 0; 555 556 eth += len; 557 if (*eth == ',') 558 eth++; 559 else if (*eth != '\0') 560 return 0; 561 562 *init_out = kmalloc(transport->setup_size, gfp_mask); 563 if (*init_out == NULL) 564 return 1; 565 566 if (!transport->setup(eth, mac_out, *init_out)) { 567 kfree(*init_out); 568 *init_out = NULL; 569 } 570 return 1; 571 } 572 573 void register_transport(struct transport *new) 574 { 575 struct list_head *ele, *next; 576 struct eth_init *eth; 577 void *init; 578 char *mac = NULL; 579 int match; 580 581 spin_lock(&transports_lock); 582 BUG_ON(!list_empty(&new->list)); 583 list_add(&new->list, &transports); 584 spin_unlock(&transports_lock); 585 586 list_for_each_safe(ele, next, ð_cmd_line) { 587 eth = list_entry(ele, struct eth_init, list); 588 match = check_transport(new, eth->init, eth->index, &init, 589 &mac, GFP_KERNEL); 590 if (!match) 591 continue; 592 else if (init != NULL) { 593 eth_configure(eth->index, init, mac, new, GFP_KERNEL); 594 kfree(init); 595 } 596 list_del(ð->list); 597 } 598 } 599 600 static int eth_setup_common(char *str, int index) 601 { 602 struct list_head *ele; 603 struct transport *transport; 604 void *init; 605 char *mac = NULL; 606 int found = 0; 607 608 spin_lock(&transports_lock); 609 list_for_each(ele, &transports) { 610 transport = list_entry(ele, struct transport, list); 611 if (!check_transport(transport, str, index, &init, 612 &mac, GFP_ATOMIC)) 613 continue; 614 if (init != NULL) { 615 eth_configure(index, init, mac, transport, GFP_ATOMIC); 616 kfree(init); 617 } 618 found = 1; 619 break; 620 } 621 622 spin_unlock(&transports_lock); 623 return found; 624 } 625 626 static int __init eth_setup(char *str) 627 { 628 struct eth_init *new; 629 char *error; 630 int n, err; 631 632 err = eth_parse(str, &n, &str, &error); 633 if (err) { 634 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n", 635 str, error); 636 return 1; 637 } 638 639 new = memblock_alloc(sizeof(*new), SMP_CACHE_BYTES); 640 if (!new) 641 panic("%s: Failed to allocate %zu bytes\n", __func__, 642 sizeof(*new)); 643 644 INIT_LIST_HEAD(&new->list); 645 new->index = n; 646 new->init = str; 647 648 list_add_tail(&new->list, ð_cmd_line); 649 return 1; 650 } 651 652 __setup("eth", eth_setup); 653 __uml_help(eth_setup, 654 "eth[0-9]+=<transport>,<options>\n" 655 " Configure a network device.\n\n" 656 ); 657 658 static int net_config(char *str, char **error_out) 659 { 660 int n, err; 661 662 err = eth_parse(str, &n, &str, error_out); 663 if (err) 664 return err; 665 666 /* This string is broken up and the pieces used by the underlying 667 * driver. So, it is freed only if eth_setup_common fails. 668 */ 669 str = kstrdup(str, GFP_KERNEL); 670 if (str == NULL) { 671 *error_out = "net_config failed to strdup string"; 672 return -ENOMEM; 673 } 674 err = !eth_setup_common(str, n); 675 if (err) 676 kfree(str); 677 return err; 678 } 679 680 static int net_id(char **str, int *start_out, int *end_out) 681 { 682 char *end; 683 int n; 684 685 n = simple_strtoul(*str, &end, 0); 686 if ((*end != '\0') || (end == *str)) 687 return -1; 688 689 *start_out = n; 690 *end_out = n; 691 *str = end; 692 return n; 693 } 694 695 static int net_remove(int n, char **error_out) 696 { 697 struct uml_net *device; 698 struct net_device *dev; 699 struct uml_net_private *lp; 700 701 device = find_device(n); 702 if (device == NULL) 703 return -ENODEV; 704 705 dev = device->dev; 706 lp = netdev_priv(dev); 707 if (lp->fd > 0) 708 return -EBUSY; 709 unregister_netdev(dev); 710 platform_device_unregister(&device->pdev); 711 712 return 0; 713 } 714 715 static struct mc_device net_mc = { 716 .list = LIST_HEAD_INIT(net_mc.list), 717 .name = "eth", 718 .config = net_config, 719 .get_config = NULL, 720 .id = net_id, 721 .remove = net_remove, 722 }; 723 724 #ifdef CONFIG_INET 725 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event, 726 void *ptr) 727 { 728 struct in_ifaddr *ifa = ptr; 729 struct net_device *dev = ifa->ifa_dev->dev; 730 struct uml_net_private *lp; 731 void (*proc)(unsigned char *, unsigned char *, void *); 732 unsigned char addr_buf[4], netmask_buf[4]; 733 734 if (dev->netdev_ops->ndo_open != uml_net_open) 735 return NOTIFY_DONE; 736 737 lp = netdev_priv(dev); 738 739 proc = NULL; 740 switch (event) { 741 case NETDEV_UP: 742 proc = lp->add_address; 743 break; 744 case NETDEV_DOWN: 745 proc = lp->delete_address; 746 break; 747 } 748 if (proc != NULL) { 749 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf)); 750 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf)); 751 (*proc)(addr_buf, netmask_buf, &lp->user); 752 } 753 return NOTIFY_DONE; 754 } 755 756 /* uml_net_init shouldn't be called twice on two CPUs at the same time */ 757 static struct notifier_block uml_inetaddr_notifier = { 758 .notifier_call = uml_inetaddr_event, 759 }; 760 761 static void inet_register(void) 762 { 763 struct list_head *ele; 764 struct uml_net_private *lp; 765 struct in_device *ip; 766 struct in_ifaddr *in; 767 768 register_inetaddr_notifier(¨_inetaddr_notifier); 769 770 /* Devices may have been opened already, so the uml_inetaddr_notifier 771 * didn't get a chance to run for them. This fakes it so that 772 * addresses which have already been set up get handled properly. 773 */ 774 spin_lock(&opened_lock); 775 list_for_each(ele, &opened) { 776 lp = list_entry(ele, struct uml_net_private, list); 777 ip = lp->dev->ip_ptr; 778 if (ip == NULL) 779 continue; 780 in = ip->ifa_list; 781 while (in != NULL) { 782 uml_inetaddr_event(NULL, NETDEV_UP, in); 783 in = in->ifa_next; 784 } 785 } 786 spin_unlock(&opened_lock); 787 } 788 #else 789 static inline void inet_register(void) 790 { 791 } 792 #endif 793 794 static int uml_net_init(void) 795 { 796 mconsole_register_dev(&net_mc); 797 inet_register(); 798 return 0; 799 } 800 801 __initcall(uml_net_init); 802 803 static void close_devices(void) 804 { 805 struct list_head *ele; 806 struct uml_net_private *lp; 807 808 spin_lock(&opened_lock); 809 list_for_each(ele, &opened) { 810 lp = list_entry(ele, struct uml_net_private, list); 811 um_free_irq(lp->dev->irq, lp->dev); 812 if ((lp->close != NULL) && (lp->fd >= 0)) 813 (*lp->close)(lp->fd, &lp->user); 814 if (lp->remove != NULL) 815 (*lp->remove)(&lp->user); 816 } 817 spin_unlock(&opened_lock); 818 } 819 820 __uml_exitcall(close_devices); 821 822 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *, 823 void *), 824 void *arg) 825 { 826 struct net_device *dev = d; 827 struct in_device *ip = dev->ip_ptr; 828 struct in_ifaddr *in; 829 unsigned char address[4], netmask[4]; 830 831 if (ip == NULL) return; 832 in = ip->ifa_list; 833 while (in != NULL) { 834 memcpy(address, &in->ifa_address, sizeof(address)); 835 memcpy(netmask, &in->ifa_mask, sizeof(netmask)); 836 (*cb)(address, netmask, arg); 837 in = in->ifa_next; 838 } 839 } 840 841 int dev_netmask(void *d, void *m) 842 { 843 struct net_device *dev = d; 844 struct in_device *ip = dev->ip_ptr; 845 struct in_ifaddr *in; 846 __be32 *mask_out = m; 847 848 if (ip == NULL) 849 return 1; 850 851 in = ip->ifa_list; 852 if (in == NULL) 853 return 1; 854 855 *mask_out = in->ifa_mask; 856 return 0; 857 } 858 859 void *get_output_buffer(int *len_out) 860 { 861 void *ret; 862 863 ret = (void *) __get_free_pages(GFP_KERNEL, 0); 864 if (ret) *len_out = PAGE_SIZE; 865 else *len_out = 0; 866 return ret; 867 } 868 869 void free_output_buffer(void *buffer) 870 { 871 free_pages((unsigned long) buffer, 0); 872 } 873 874 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out, 875 char **gate_addr) 876 { 877 char *remain; 878 879 remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL); 880 if (remain != NULL) { 881 printk(KERN_ERR "tap_setup_common - Extra garbage on " 882 "specification : '%s'\n", remain); 883 return 1; 884 } 885 886 return 0; 887 } 888 889 unsigned short eth_protocol(struct sk_buff *skb) 890 { 891 return eth_type_trans(skb, skb->dev); 892 } 893