1 /* 2 * TUN - Universal TUN/TAP device driver. 3 * Copyright (C) 1999-2002 Maxim Krasnyansky <maxk@qualcomm.com> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * $Id: tun.c,v 1.15 2002/03/01 02:44:24 maxk Exp $ 16 */ 17 18 /* 19 * Changes: 20 * 21 * Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14 22 * Add TUNSETLINK ioctl to set the link encapsulation 23 * 24 * Mark Smith <markzzzsmith@yahoo.com.au> 25 * Use random_ether_addr() for tap MAC address. 26 * 27 * Harald Roelle <harald.roelle@ifi.lmu.de> 2004/04/20 28 * Fixes in packet dropping, queue length setting and queue wakeup. 29 * Increased default tx queue length. 30 * Added ethtool API. 31 * Minor cleanups 32 * 33 * Daniel Podlejski <underley@underley.eu.org> 34 * Modifications for 2.3.99-pre5 kernel. 35 */ 36 37 #define DRV_NAME "tun" 38 #define DRV_VERSION "1.6" 39 #define DRV_DESCRIPTION "Universal TUN/TAP device driver" 40 #define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>" 41 42 #include <linux/config.h> 43 #include <linux/module.h> 44 #include <linux/errno.h> 45 #include <linux/kernel.h> 46 #include <linux/major.h> 47 #include <linux/slab.h> 48 #include <linux/poll.h> 49 #include <linux/fcntl.h> 50 #include <linux/init.h> 51 #include <linux/skbuff.h> 52 #include <linux/netdevice.h> 53 #include <linux/etherdevice.h> 54 #include <linux/miscdevice.h> 55 #include <linux/ethtool.h> 56 #include <linux/rtnetlink.h> 57 #include <linux/if.h> 58 #include <linux/if_arp.h> 59 #include <linux/if_ether.h> 60 #include <linux/if_tun.h> 61 #include <linux/crc32.h> 62 63 #include <asm/system.h> 64 #include <asm/uaccess.h> 65 66 #ifdef TUN_DEBUG 67 static int debug; 68 #endif 69 70 /* Network device part of the driver */ 71 72 static LIST_HEAD(tun_dev_list); 73 static struct ethtool_ops tun_ethtool_ops; 74 75 /* Net device open. */ 76 static int tun_net_open(struct net_device *dev) 77 { 78 netif_start_queue(dev); 79 return 0; 80 } 81 82 /* Net device close. */ 83 static int tun_net_close(struct net_device *dev) 84 { 85 netif_stop_queue(dev); 86 return 0; 87 } 88 89 /* Net device start xmit */ 90 static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev) 91 { 92 struct tun_struct *tun = netdev_priv(dev); 93 94 DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len); 95 96 /* Drop packet if interface is not attached */ 97 if (!tun->attached) 98 goto drop; 99 100 /* Packet dropping */ 101 if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) { 102 if (!(tun->flags & TUN_ONE_QUEUE)) { 103 /* Normal queueing mode. */ 104 /* Packet scheduler handles dropping of further packets. */ 105 netif_stop_queue(dev); 106 107 /* We won't see all dropped packets individually, so overrun 108 * error is more appropriate. */ 109 tun->stats.tx_fifo_errors++; 110 } else { 111 /* Single queue mode. 112 * Driver handles dropping of all packets itself. */ 113 goto drop; 114 } 115 } 116 117 /* Queue packet */ 118 skb_queue_tail(&tun->readq, skb); 119 dev->trans_start = jiffies; 120 121 /* Notify and wake up reader process */ 122 if (tun->flags & TUN_FASYNC) 123 kill_fasync(&tun->fasync, SIGIO, POLL_IN); 124 wake_up_interruptible(&tun->read_wait); 125 return 0; 126 127 drop: 128 tun->stats.tx_dropped++; 129 kfree_skb(skb); 130 return 0; 131 } 132 133 /** Add the specified Ethernet address to this multicast filter. */ 134 static void 135 add_multi(u32* filter, const u8* addr) 136 { 137 int bit_nr = ether_crc(ETH_ALEN, addr) >> 26; 138 filter[bit_nr >> 5] |= 1 << (bit_nr & 31); 139 } 140 141 /** Remove the specified Ethernet addres from this multicast filter. */ 142 static void 143 del_multi(u32* filter, const u8* addr) 144 { 145 int bit_nr = ether_crc(ETH_ALEN, addr) >> 26; 146 filter[bit_nr >> 5] &= ~(1 << (bit_nr & 31)); 147 } 148 149 /** Update the list of multicast groups to which the network device belongs. 150 * This list is used to filter packets being sent from the character device to 151 * the network device. */ 152 static void 153 tun_net_mclist(struct net_device *dev) 154 { 155 struct tun_struct *tun = netdev_priv(dev); 156 const struct dev_mc_list *mclist; 157 int i; 158 DBG(KERN_DEBUG "%s: tun_net_mclist: mc_count %d\n", 159 dev->name, dev->mc_count); 160 memset(tun->chr_filter, 0, sizeof tun->chr_filter); 161 for (i = 0, mclist = dev->mc_list; i < dev->mc_count && mclist != NULL; 162 i++, mclist = mclist->next) { 163 add_multi(tun->net_filter, mclist->dmi_addr); 164 DBG(KERN_DEBUG "%s: tun_net_mclist: %x:%x:%x:%x:%x:%x\n", 165 dev->name, 166 mclist->dmi_addr[0], mclist->dmi_addr[1], mclist->dmi_addr[2], 167 mclist->dmi_addr[3], mclist->dmi_addr[4], mclist->dmi_addr[5]); 168 } 169 } 170 171 static struct net_device_stats *tun_net_stats(struct net_device *dev) 172 { 173 struct tun_struct *tun = netdev_priv(dev); 174 return &tun->stats; 175 } 176 177 /* Initialize net device. */ 178 static void tun_net_init(struct net_device *dev) 179 { 180 struct tun_struct *tun = netdev_priv(dev); 181 182 switch (tun->flags & TUN_TYPE_MASK) { 183 case TUN_TUN_DEV: 184 /* Point-to-Point TUN Device */ 185 dev->hard_header_len = 0; 186 dev->addr_len = 0; 187 dev->mtu = 1500; 188 189 /* Zero header length */ 190 dev->type = ARPHRD_NONE; 191 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 192 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ 193 break; 194 195 case TUN_TAP_DEV: 196 /* Ethernet TAP Device */ 197 dev->set_multicast_list = tun_net_mclist; 198 199 ether_setup(dev); 200 random_ether_addr(dev->dev_addr); 201 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ 202 break; 203 } 204 } 205 206 /* Character device part */ 207 208 /* Poll */ 209 static unsigned int tun_chr_poll(struct file *file, poll_table * wait) 210 { 211 struct tun_struct *tun = file->private_data; 212 unsigned int mask = POLLOUT | POLLWRNORM; 213 214 if (!tun) 215 return -EBADFD; 216 217 DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name); 218 219 poll_wait(file, &tun->read_wait, wait); 220 221 if (!skb_queue_empty(&tun->readq)) 222 mask |= POLLIN | POLLRDNORM; 223 224 return mask; 225 } 226 227 /* Get packet from user space buffer */ 228 static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count) 229 { 230 struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) }; 231 struct sk_buff *skb; 232 size_t len = count, align = 0; 233 234 if (!(tun->flags & TUN_NO_PI)) { 235 if ((len -= sizeof(pi)) > count) 236 return -EINVAL; 237 238 if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi))) 239 return -EFAULT; 240 } 241 242 if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) 243 align = NET_IP_ALIGN; 244 245 if (!(skb = alloc_skb(len + align, GFP_KERNEL))) { 246 tun->stats.rx_dropped++; 247 return -ENOMEM; 248 } 249 250 if (align) 251 skb_reserve(skb, align); 252 if (memcpy_fromiovec(skb_put(skb, len), iv, len)) { 253 tun->stats.rx_dropped++; 254 kfree_skb(skb); 255 return -EFAULT; 256 } 257 258 skb->dev = tun->dev; 259 switch (tun->flags & TUN_TYPE_MASK) { 260 case TUN_TUN_DEV: 261 skb->mac.raw = skb->data; 262 skb->protocol = pi.proto; 263 break; 264 case TUN_TAP_DEV: 265 skb->protocol = eth_type_trans(skb, tun->dev); 266 break; 267 }; 268 269 if (tun->flags & TUN_NOCHECKSUM) 270 skb->ip_summed = CHECKSUM_UNNECESSARY; 271 272 netif_rx_ni(skb); 273 tun->dev->last_rx = jiffies; 274 275 tun->stats.rx_packets++; 276 tun->stats.rx_bytes += len; 277 278 return count; 279 } 280 281 static inline size_t iov_total(const struct iovec *iv, unsigned long count) 282 { 283 unsigned long i; 284 size_t len; 285 286 for (i = 0, len = 0; i < count; i++) 287 len += iv[i].iov_len; 288 289 return len; 290 } 291 292 /* Writev */ 293 static ssize_t tun_chr_writev(struct file * file, const struct iovec *iv, 294 unsigned long count, loff_t *pos) 295 { 296 struct tun_struct *tun = file->private_data; 297 298 if (!tun) 299 return -EBADFD; 300 301 DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count); 302 303 return tun_get_user(tun, (struct iovec *) iv, iov_total(iv, count)); 304 } 305 306 /* Write */ 307 static ssize_t tun_chr_write(struct file * file, const char __user * buf, 308 size_t count, loff_t *pos) 309 { 310 struct iovec iv = { (void __user *) buf, count }; 311 return tun_chr_writev(file, &iv, 1, pos); 312 } 313 314 /* Put packet to the user space buffer */ 315 static __inline__ ssize_t tun_put_user(struct tun_struct *tun, 316 struct sk_buff *skb, 317 struct iovec *iv, int len) 318 { 319 struct tun_pi pi = { 0, skb->protocol }; 320 ssize_t total = 0; 321 322 if (!(tun->flags & TUN_NO_PI)) { 323 if ((len -= sizeof(pi)) < 0) 324 return -EINVAL; 325 326 if (len < skb->len) { 327 /* Packet will be striped */ 328 pi.flags |= TUN_PKT_STRIP; 329 } 330 331 if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi))) 332 return -EFAULT; 333 total += sizeof(pi); 334 } 335 336 len = min_t(int, skb->len, len); 337 338 skb_copy_datagram_iovec(skb, 0, iv, len); 339 total += len; 340 341 tun->stats.tx_packets++; 342 tun->stats.tx_bytes += len; 343 344 return total; 345 } 346 347 /* Readv */ 348 static ssize_t tun_chr_readv(struct file *file, const struct iovec *iv, 349 unsigned long count, loff_t *pos) 350 { 351 struct tun_struct *tun = file->private_data; 352 DECLARE_WAITQUEUE(wait, current); 353 struct sk_buff *skb; 354 ssize_t len, ret = 0; 355 356 if (!tun) 357 return -EBADFD; 358 359 DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name); 360 361 len = iov_total(iv, count); 362 if (len < 0) 363 return -EINVAL; 364 365 add_wait_queue(&tun->read_wait, &wait); 366 while (len) { 367 const u8 ones[ ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 368 u8 addr[ ETH_ALEN]; 369 int bit_nr; 370 371 current->state = TASK_INTERRUPTIBLE; 372 373 /* Read frames from the queue */ 374 if (!(skb=skb_dequeue(&tun->readq))) { 375 if (file->f_flags & O_NONBLOCK) { 376 ret = -EAGAIN; 377 break; 378 } 379 if (signal_pending(current)) { 380 ret = -ERESTARTSYS; 381 break; 382 } 383 384 /* Nothing to read, let's sleep */ 385 schedule(); 386 continue; 387 } 388 netif_wake_queue(tun->dev); 389 390 /** Decide whether to accept this packet. This code is designed to 391 * behave identically to an Ethernet interface. Accept the packet if 392 * - we are promiscuous. 393 * - the packet is addressed to us. 394 * - the packet is broadcast. 395 * - the packet is multicast and 396 * - we are multicast promiscous. 397 * - we belong to the multicast group. 398 */ 399 memcpy(addr, skb->data, 400 min_t(size_t, sizeof addr, skb->len)); 401 bit_nr = ether_crc(sizeof addr, addr) >> 26; 402 if ((tun->if_flags & IFF_PROMISC) || 403 memcmp(addr, tun->dev_addr, sizeof addr) == 0 || 404 memcmp(addr, ones, sizeof addr) == 0 || 405 (((addr[0] == 1 && addr[1] == 0 && addr[2] == 0x5e) || 406 (addr[0] == 0x33 && addr[1] == 0x33)) && 407 ((tun->if_flags & IFF_ALLMULTI) || 408 (tun->chr_filter[bit_nr >> 5] & (1 << (bit_nr & 31)))))) { 409 DBG(KERN_DEBUG "%s: tun_chr_readv: accepted: %x:%x:%x:%x:%x:%x\n", 410 tun->dev->name, addr[0], addr[1], addr[2], 411 addr[3], addr[4], addr[5]); 412 ret = tun_put_user(tun, skb, (struct iovec *) iv, len); 413 kfree_skb(skb); 414 break; 415 } else { 416 DBG(KERN_DEBUG "%s: tun_chr_readv: rejected: %x:%x:%x:%x:%x:%x\n", 417 tun->dev->name, addr[0], addr[1], addr[2], 418 addr[3], addr[4], addr[5]); 419 kfree_skb(skb); 420 continue; 421 } 422 } 423 424 current->state = TASK_RUNNING; 425 remove_wait_queue(&tun->read_wait, &wait); 426 427 return ret; 428 } 429 430 /* Read */ 431 static ssize_t tun_chr_read(struct file * file, char __user * buf, 432 size_t count, loff_t *pos) 433 { 434 struct iovec iv = { buf, count }; 435 return tun_chr_readv(file, &iv, 1, pos); 436 } 437 438 static void tun_setup(struct net_device *dev) 439 { 440 struct tun_struct *tun = netdev_priv(dev); 441 442 skb_queue_head_init(&tun->readq); 443 init_waitqueue_head(&tun->read_wait); 444 445 tun->owner = -1; 446 447 SET_MODULE_OWNER(dev); 448 dev->open = tun_net_open; 449 dev->hard_start_xmit = tun_net_xmit; 450 dev->stop = tun_net_close; 451 dev->get_stats = tun_net_stats; 452 dev->ethtool_ops = &tun_ethtool_ops; 453 dev->destructor = free_netdev; 454 } 455 456 static struct tun_struct *tun_get_by_name(const char *name) 457 { 458 struct tun_struct *tun; 459 460 ASSERT_RTNL(); 461 list_for_each_entry(tun, &tun_dev_list, list) { 462 if (!strncmp(tun->dev->name, name, IFNAMSIZ)) 463 return tun; 464 } 465 466 return NULL; 467 } 468 469 static int tun_set_iff(struct file *file, struct ifreq *ifr) 470 { 471 struct tun_struct *tun; 472 struct net_device *dev; 473 int err; 474 475 tun = tun_get_by_name(ifr->ifr_name); 476 if (tun) { 477 if (tun->attached) 478 return -EBUSY; 479 480 /* Check permissions */ 481 if (tun->owner != -1 && 482 current->euid != tun->owner && !capable(CAP_NET_ADMIN)) 483 return -EPERM; 484 } 485 else if (__dev_get_by_name(ifr->ifr_name)) 486 return -EINVAL; 487 else { 488 char *name; 489 unsigned long flags = 0; 490 491 err = -EINVAL; 492 493 if (!capable(CAP_NET_ADMIN)) 494 return -EPERM; 495 496 /* Set dev type */ 497 if (ifr->ifr_flags & IFF_TUN) { 498 /* TUN device */ 499 flags |= TUN_TUN_DEV; 500 name = "tun%d"; 501 } else if (ifr->ifr_flags & IFF_TAP) { 502 /* TAP device */ 503 flags |= TUN_TAP_DEV; 504 name = "tap%d"; 505 } else 506 goto failed; 507 508 if (*ifr->ifr_name) 509 name = ifr->ifr_name; 510 511 dev = alloc_netdev(sizeof(struct tun_struct), name, 512 tun_setup); 513 if (!dev) 514 return -ENOMEM; 515 516 tun = netdev_priv(dev); 517 tun->dev = dev; 518 tun->flags = flags; 519 /* Be promiscuous by default to maintain previous behaviour. */ 520 tun->if_flags = IFF_PROMISC; 521 /* Generate random Ethernet address. */ 522 *(u16 *)tun->dev_addr = htons(0x00FF); 523 get_random_bytes(tun->dev_addr + sizeof(u16), 4); 524 memset(tun->chr_filter, 0, sizeof tun->chr_filter); 525 526 tun_net_init(dev); 527 528 if (strchr(dev->name, '%')) { 529 err = dev_alloc_name(dev, dev->name); 530 if (err < 0) 531 goto err_free_dev; 532 } 533 534 err = register_netdevice(tun->dev); 535 if (err < 0) 536 goto err_free_dev; 537 538 list_add(&tun->list, &tun_dev_list); 539 } 540 541 DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name); 542 543 if (ifr->ifr_flags & IFF_NO_PI) 544 tun->flags |= TUN_NO_PI; 545 546 if (ifr->ifr_flags & IFF_ONE_QUEUE) 547 tun->flags |= TUN_ONE_QUEUE; 548 549 file->private_data = tun; 550 tun->attached = 1; 551 552 strcpy(ifr->ifr_name, tun->dev->name); 553 return 0; 554 555 err_free_dev: 556 free_netdev(dev); 557 failed: 558 return err; 559 } 560 561 static int tun_chr_ioctl(struct inode *inode, struct file *file, 562 unsigned int cmd, unsigned long arg) 563 { 564 struct tun_struct *tun = file->private_data; 565 void __user* argp = (void __user*)arg; 566 struct ifreq ifr; 567 568 if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) 569 if (copy_from_user(&ifr, argp, sizeof ifr)) 570 return -EFAULT; 571 572 if (cmd == TUNSETIFF && !tun) { 573 int err; 574 575 ifr.ifr_name[IFNAMSIZ-1] = '\0'; 576 577 rtnl_lock(); 578 err = tun_set_iff(file, &ifr); 579 rtnl_unlock(); 580 581 if (err) 582 return err; 583 584 if (copy_to_user(argp, &ifr, sizeof(ifr))) 585 return -EFAULT; 586 return 0; 587 } 588 589 if (!tun) 590 return -EBADFD; 591 592 DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd); 593 594 switch (cmd) { 595 case TUNSETNOCSUM: 596 /* Disable/Enable checksum */ 597 if (arg) 598 tun->flags |= TUN_NOCHECKSUM; 599 else 600 tun->flags &= ~TUN_NOCHECKSUM; 601 602 DBG(KERN_INFO "%s: checksum %s\n", 603 tun->dev->name, arg ? "disabled" : "enabled"); 604 break; 605 606 case TUNSETPERSIST: 607 /* Disable/Enable persist mode */ 608 if (arg) 609 tun->flags |= TUN_PERSIST; 610 else 611 tun->flags &= ~TUN_PERSIST; 612 613 DBG(KERN_INFO "%s: persist %s\n", 614 tun->dev->name, arg ? "disabled" : "enabled"); 615 break; 616 617 case TUNSETOWNER: 618 /* Set owner of the device */ 619 tun->owner = (uid_t) arg; 620 621 DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner); 622 break; 623 624 case TUNSETLINK: 625 /* Only allow setting the type when the interface is down */ 626 if (tun->dev->flags & IFF_UP) { 627 DBG(KERN_INFO "%s: Linktype set failed because interface is up\n", 628 tun->dev->name); 629 return -EBUSY; 630 } else { 631 tun->dev->type = (int) arg; 632 DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type); 633 } 634 break; 635 636 #ifdef TUN_DEBUG 637 case TUNSETDEBUG: 638 tun->debug = arg; 639 break; 640 #endif 641 642 case SIOCGIFFLAGS: 643 ifr.ifr_flags = tun->if_flags; 644 if (copy_to_user( argp, &ifr, sizeof ifr)) 645 return -EFAULT; 646 return 0; 647 648 case SIOCSIFFLAGS: 649 /** Set the character device's interface flags. Currently only 650 * IFF_PROMISC and IFF_ALLMULTI are used. */ 651 tun->if_flags = ifr.ifr_flags; 652 DBG(KERN_INFO "%s: interface flags 0x%lx\n", 653 tun->dev->name, tun->if_flags); 654 return 0; 655 656 case SIOCGIFHWADDR: 657 memcpy(ifr.ifr_hwaddr.sa_data, tun->dev_addr, 658 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr)); 659 if (copy_to_user( argp, &ifr, sizeof ifr)) 660 return -EFAULT; 661 return 0; 662 663 case SIOCSIFHWADDR: 664 /** Set the character device's hardware address. This is used when 665 * filtering packets being sent from the network device to the character 666 * device. */ 667 memcpy(tun->dev_addr, ifr.ifr_hwaddr.sa_data, 668 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr)); 669 DBG(KERN_DEBUG "%s: set hardware address: %x:%x:%x:%x:%x:%x\n", 670 tun->dev->name, 671 tun->dev_addr[0], tun->dev_addr[1], tun->dev_addr[2], 672 tun->dev_addr[3], tun->dev_addr[4], tun->dev_addr[5]); 673 return 0; 674 675 case SIOCADDMULTI: 676 /** Add the specified group to the character device's multicast filter 677 * list. */ 678 add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data); 679 DBG(KERN_DEBUG "%s: add multi: %x:%x:%x:%x:%x:%x\n", 680 tun->dev->name, 681 (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1], 682 (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3], 683 (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]); 684 return 0; 685 686 case SIOCDELMULTI: 687 /** Remove the specified group from the character device's multicast 688 * filter list. */ 689 del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data); 690 DBG(KERN_DEBUG "%s: del multi: %x:%x:%x:%x:%x:%x\n", 691 tun->dev->name, 692 (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1], 693 (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3], 694 (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]); 695 return 0; 696 697 default: 698 return -EINVAL; 699 }; 700 701 return 0; 702 } 703 704 static int tun_chr_fasync(int fd, struct file *file, int on) 705 { 706 struct tun_struct *tun = file->private_data; 707 int ret; 708 709 if (!tun) 710 return -EBADFD; 711 712 DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on); 713 714 if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) 715 return ret; 716 717 if (on) { 718 ret = f_setown(file, current->pid, 0); 719 if (ret) 720 return ret; 721 tun->flags |= TUN_FASYNC; 722 } else 723 tun->flags &= ~TUN_FASYNC; 724 725 return 0; 726 } 727 728 static int tun_chr_open(struct inode *inode, struct file * file) 729 { 730 DBG1(KERN_INFO "tunX: tun_chr_open\n"); 731 file->private_data = NULL; 732 return 0; 733 } 734 735 static int tun_chr_close(struct inode *inode, struct file *file) 736 { 737 struct tun_struct *tun = file->private_data; 738 739 if (!tun) 740 return 0; 741 742 DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name); 743 744 tun_chr_fasync(-1, file, 0); 745 746 rtnl_lock(); 747 748 /* Detach from net device */ 749 file->private_data = NULL; 750 tun->attached = 0; 751 752 /* Drop read queue */ 753 skb_queue_purge(&tun->readq); 754 755 if (!(tun->flags & TUN_PERSIST)) { 756 list_del(&tun->list); 757 unregister_netdevice(tun->dev); 758 } 759 760 rtnl_unlock(); 761 762 return 0; 763 } 764 765 static struct file_operations tun_fops = { 766 .owner = THIS_MODULE, 767 .llseek = no_llseek, 768 .read = tun_chr_read, 769 .readv = tun_chr_readv, 770 .write = tun_chr_write, 771 .writev = tun_chr_writev, 772 .poll = tun_chr_poll, 773 .ioctl = tun_chr_ioctl, 774 .open = tun_chr_open, 775 .release = tun_chr_close, 776 .fasync = tun_chr_fasync 777 }; 778 779 static struct miscdevice tun_miscdev = { 780 .minor = TUN_MINOR, 781 .name = "tun", 782 .fops = &tun_fops, 783 }; 784 785 /* ethtool interface */ 786 787 static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) 788 { 789 cmd->supported = 0; 790 cmd->advertising = 0; 791 cmd->speed = SPEED_10; 792 cmd->duplex = DUPLEX_FULL; 793 cmd->port = PORT_TP; 794 cmd->phy_address = 0; 795 cmd->transceiver = XCVR_INTERNAL; 796 cmd->autoneg = AUTONEG_DISABLE; 797 cmd->maxtxpkt = 0; 798 cmd->maxrxpkt = 0; 799 return 0; 800 } 801 802 static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) 803 { 804 struct tun_struct *tun = netdev_priv(dev); 805 806 strcpy(info->driver, DRV_NAME); 807 strcpy(info->version, DRV_VERSION); 808 strcpy(info->fw_version, "N/A"); 809 810 switch (tun->flags & TUN_TYPE_MASK) { 811 case TUN_TUN_DEV: 812 strcpy(info->bus_info, "tun"); 813 break; 814 case TUN_TAP_DEV: 815 strcpy(info->bus_info, "tap"); 816 break; 817 } 818 } 819 820 static u32 tun_get_msglevel(struct net_device *dev) 821 { 822 #ifdef TUN_DEBUG 823 struct tun_struct *tun = netdev_priv(dev); 824 return tun->debug; 825 #else 826 return -EOPNOTSUPP; 827 #endif 828 } 829 830 static void tun_set_msglevel(struct net_device *dev, u32 value) 831 { 832 #ifdef TUN_DEBUG 833 struct tun_struct *tun = netdev_priv(dev); 834 tun->debug = value; 835 #endif 836 } 837 838 static u32 tun_get_link(struct net_device *dev) 839 { 840 struct tun_struct *tun = netdev_priv(dev); 841 return tun->attached; 842 } 843 844 static u32 tun_get_rx_csum(struct net_device *dev) 845 { 846 struct tun_struct *tun = netdev_priv(dev); 847 return (tun->flags & TUN_NOCHECKSUM) == 0; 848 } 849 850 static int tun_set_rx_csum(struct net_device *dev, u32 data) 851 { 852 struct tun_struct *tun = netdev_priv(dev); 853 if (data) 854 tun->flags &= ~TUN_NOCHECKSUM; 855 else 856 tun->flags |= TUN_NOCHECKSUM; 857 return 0; 858 } 859 860 static struct ethtool_ops tun_ethtool_ops = { 861 .get_settings = tun_get_settings, 862 .get_drvinfo = tun_get_drvinfo, 863 .get_msglevel = tun_get_msglevel, 864 .set_msglevel = tun_set_msglevel, 865 .get_link = tun_get_link, 866 .get_rx_csum = tun_get_rx_csum, 867 .set_rx_csum = tun_set_rx_csum 868 }; 869 870 static int __init tun_init(void) 871 { 872 int ret = 0; 873 874 printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION); 875 printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT); 876 877 ret = misc_register(&tun_miscdev); 878 if (ret) 879 printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR); 880 return ret; 881 } 882 883 static void tun_cleanup(void) 884 { 885 struct tun_struct *tun, *nxt; 886 887 misc_deregister(&tun_miscdev); 888 889 rtnl_lock(); 890 list_for_each_entry_safe(tun, nxt, &tun_dev_list, list) { 891 DBG(KERN_INFO "%s cleaned up\n", tun->dev->name); 892 unregister_netdevice(tun->dev); 893 } 894 rtnl_unlock(); 895 896 } 897 898 module_init(tun_init); 899 module_exit(tun_cleanup); 900 MODULE_DESCRIPTION(DRV_DESCRIPTION); 901 MODULE_AUTHOR(DRV_COPYRIGHT); 902 MODULE_LICENSE("GPL"); 903 MODULE_ALIAS_MISCDEV(TUN_MINOR); 904