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 return -EFAULT; 254 255 skb->dev = tun->dev; 256 switch (tun->flags & TUN_TYPE_MASK) { 257 case TUN_TUN_DEV: 258 skb->mac.raw = skb->data; 259 skb->protocol = pi.proto; 260 break; 261 case TUN_TAP_DEV: 262 skb->protocol = eth_type_trans(skb, tun->dev); 263 break; 264 }; 265 266 if (tun->flags & TUN_NOCHECKSUM) 267 skb->ip_summed = CHECKSUM_UNNECESSARY; 268 269 netif_rx_ni(skb); 270 tun->dev->last_rx = jiffies; 271 272 tun->stats.rx_packets++; 273 tun->stats.rx_bytes += len; 274 275 return count; 276 } 277 278 static inline size_t iov_total(const struct iovec *iv, unsigned long count) 279 { 280 unsigned long i; 281 size_t len; 282 283 for (i = 0, len = 0; i < count; i++) 284 len += iv[i].iov_len; 285 286 return len; 287 } 288 289 /* Writev */ 290 static ssize_t tun_chr_writev(struct file * file, const struct iovec *iv, 291 unsigned long count, loff_t *pos) 292 { 293 struct tun_struct *tun = file->private_data; 294 295 if (!tun) 296 return -EBADFD; 297 298 DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count); 299 300 return tun_get_user(tun, (struct iovec *) iv, iov_total(iv, count)); 301 } 302 303 /* Write */ 304 static ssize_t tun_chr_write(struct file * file, const char __user * buf, 305 size_t count, loff_t *pos) 306 { 307 struct iovec iv = { (void __user *) buf, count }; 308 return tun_chr_writev(file, &iv, 1, pos); 309 } 310 311 /* Put packet to the user space buffer */ 312 static __inline__ ssize_t tun_put_user(struct tun_struct *tun, 313 struct sk_buff *skb, 314 struct iovec *iv, int len) 315 { 316 struct tun_pi pi = { 0, skb->protocol }; 317 ssize_t total = 0; 318 319 if (!(tun->flags & TUN_NO_PI)) { 320 if ((len -= sizeof(pi)) < 0) 321 return -EINVAL; 322 323 if (len < skb->len) { 324 /* Packet will be striped */ 325 pi.flags |= TUN_PKT_STRIP; 326 } 327 328 if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi))) 329 return -EFAULT; 330 total += sizeof(pi); 331 } 332 333 len = min_t(int, skb->len, len); 334 335 skb_copy_datagram_iovec(skb, 0, iv, len); 336 total += len; 337 338 tun->stats.tx_packets++; 339 tun->stats.tx_bytes += len; 340 341 return total; 342 } 343 344 /* Readv */ 345 static ssize_t tun_chr_readv(struct file *file, const struct iovec *iv, 346 unsigned long count, loff_t *pos) 347 { 348 struct tun_struct *tun = file->private_data; 349 DECLARE_WAITQUEUE(wait, current); 350 struct sk_buff *skb; 351 ssize_t len, ret = 0; 352 353 if (!tun) 354 return -EBADFD; 355 356 DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name); 357 358 len = iov_total(iv, count); 359 if (len < 0) 360 return -EINVAL; 361 362 add_wait_queue(&tun->read_wait, &wait); 363 while (len) { 364 const u8 ones[ ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 365 u8 addr[ ETH_ALEN]; 366 int bit_nr; 367 368 current->state = TASK_INTERRUPTIBLE; 369 370 /* Read frames from the queue */ 371 if (!(skb=skb_dequeue(&tun->readq))) { 372 if (file->f_flags & O_NONBLOCK) { 373 ret = -EAGAIN; 374 break; 375 } 376 if (signal_pending(current)) { 377 ret = -ERESTARTSYS; 378 break; 379 } 380 381 /* Nothing to read, let's sleep */ 382 schedule(); 383 continue; 384 } 385 netif_wake_queue(tun->dev); 386 387 /** Decide whether to accept this packet. This code is designed to 388 * behave identically to an Ethernet interface. Accept the packet if 389 * - we are promiscuous. 390 * - the packet is addressed to us. 391 * - the packet is broadcast. 392 * - the packet is multicast and 393 * - we are multicast promiscous. 394 * - we belong to the multicast group. 395 */ 396 memcpy(addr, skb->data, 397 min_t(size_t, sizeof addr, skb->len)); 398 bit_nr = ether_crc(sizeof addr, addr) >> 26; 399 if ((tun->if_flags & IFF_PROMISC) || 400 memcmp(addr, tun->dev_addr, sizeof addr) == 0 || 401 memcmp(addr, ones, sizeof addr) == 0 || 402 (((addr[0] == 1 && addr[1] == 0 && addr[2] == 0x5e) || 403 (addr[0] == 0x33 && addr[1] == 0x33)) && 404 ((tun->if_flags & IFF_ALLMULTI) || 405 (tun->chr_filter[bit_nr >> 5] & (1 << (bit_nr & 31)))))) { 406 DBG(KERN_DEBUG "%s: tun_chr_readv: accepted: %x:%x:%x:%x:%x:%x\n", 407 tun->dev->name, addr[0], addr[1], addr[2], 408 addr[3], addr[4], addr[5]); 409 ret = tun_put_user(tun, skb, (struct iovec *) iv, len); 410 kfree_skb(skb); 411 break; 412 } else { 413 DBG(KERN_DEBUG "%s: tun_chr_readv: rejected: %x:%x:%x:%x:%x:%x\n", 414 tun->dev->name, addr[0], addr[1], addr[2], 415 addr[3], addr[4], addr[5]); 416 kfree_skb(skb); 417 continue; 418 } 419 } 420 421 current->state = TASK_RUNNING; 422 remove_wait_queue(&tun->read_wait, &wait); 423 424 return ret; 425 } 426 427 /* Read */ 428 static ssize_t tun_chr_read(struct file * file, char __user * buf, 429 size_t count, loff_t *pos) 430 { 431 struct iovec iv = { buf, count }; 432 return tun_chr_readv(file, &iv, 1, pos); 433 } 434 435 static void tun_setup(struct net_device *dev) 436 { 437 struct tun_struct *tun = netdev_priv(dev); 438 439 skb_queue_head_init(&tun->readq); 440 init_waitqueue_head(&tun->read_wait); 441 442 tun->owner = -1; 443 444 SET_MODULE_OWNER(dev); 445 dev->open = tun_net_open; 446 dev->hard_start_xmit = tun_net_xmit; 447 dev->stop = tun_net_close; 448 dev->get_stats = tun_net_stats; 449 dev->ethtool_ops = &tun_ethtool_ops; 450 dev->destructor = free_netdev; 451 } 452 453 static struct tun_struct *tun_get_by_name(const char *name) 454 { 455 struct tun_struct *tun; 456 457 ASSERT_RTNL(); 458 list_for_each_entry(tun, &tun_dev_list, list) { 459 if (!strncmp(tun->dev->name, name, IFNAMSIZ)) 460 return tun; 461 } 462 463 return NULL; 464 } 465 466 static int tun_set_iff(struct file *file, struct ifreq *ifr) 467 { 468 struct tun_struct *tun; 469 struct net_device *dev; 470 int err; 471 472 tun = tun_get_by_name(ifr->ifr_name); 473 if (tun) { 474 if (tun->attached) 475 return -EBUSY; 476 477 /* Check permissions */ 478 if (tun->owner != -1 && 479 current->euid != tun->owner && !capable(CAP_NET_ADMIN)) 480 return -EPERM; 481 } 482 else if (__dev_get_by_name(ifr->ifr_name)) 483 return -EINVAL; 484 else { 485 char *name; 486 unsigned long flags = 0; 487 488 err = -EINVAL; 489 490 /* Set dev type */ 491 if (ifr->ifr_flags & IFF_TUN) { 492 /* TUN device */ 493 flags |= TUN_TUN_DEV; 494 name = "tun%d"; 495 } else if (ifr->ifr_flags & IFF_TAP) { 496 /* TAP device */ 497 flags |= TUN_TAP_DEV; 498 name = "tap%d"; 499 } else 500 goto failed; 501 502 if (*ifr->ifr_name) 503 name = ifr->ifr_name; 504 505 dev = alloc_netdev(sizeof(struct tun_struct), name, 506 tun_setup); 507 if (!dev) 508 return -ENOMEM; 509 510 tun = netdev_priv(dev); 511 tun->dev = dev; 512 tun->flags = flags; 513 /* Be promiscuous by default to maintain previous behaviour. */ 514 tun->if_flags = IFF_PROMISC; 515 /* Generate random Ethernet address. */ 516 *(u16 *)tun->dev_addr = htons(0x00FF); 517 get_random_bytes(tun->dev_addr + sizeof(u16), 4); 518 memset(tun->chr_filter, 0, sizeof tun->chr_filter); 519 520 tun_net_init(dev); 521 522 if (strchr(dev->name, '%')) { 523 err = dev_alloc_name(dev, dev->name); 524 if (err < 0) 525 goto err_free_dev; 526 } 527 528 err = register_netdevice(tun->dev); 529 if (err < 0) 530 goto err_free_dev; 531 532 list_add(&tun->list, &tun_dev_list); 533 } 534 535 DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name); 536 537 if (ifr->ifr_flags & IFF_NO_PI) 538 tun->flags |= TUN_NO_PI; 539 540 if (ifr->ifr_flags & IFF_ONE_QUEUE) 541 tun->flags |= TUN_ONE_QUEUE; 542 543 file->private_data = tun; 544 tun->attached = 1; 545 546 strcpy(ifr->ifr_name, tun->dev->name); 547 return 0; 548 549 err_free_dev: 550 free_netdev(dev); 551 failed: 552 return err; 553 } 554 555 static int tun_chr_ioctl(struct inode *inode, struct file *file, 556 unsigned int cmd, unsigned long arg) 557 { 558 struct tun_struct *tun = file->private_data; 559 void __user* argp = (void __user*)arg; 560 struct ifreq ifr; 561 562 if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) 563 if (copy_from_user(&ifr, argp, sizeof ifr)) 564 return -EFAULT; 565 566 if (cmd == TUNSETIFF && !tun) { 567 int err; 568 569 ifr.ifr_name[IFNAMSIZ-1] = '\0'; 570 571 rtnl_lock(); 572 err = tun_set_iff(file, &ifr); 573 rtnl_unlock(); 574 575 if (err) 576 return err; 577 578 if (copy_to_user(argp, &ifr, sizeof(ifr))) 579 return -EFAULT; 580 return 0; 581 } 582 583 if (!tun) 584 return -EBADFD; 585 586 DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd); 587 588 switch (cmd) { 589 case TUNSETNOCSUM: 590 /* Disable/Enable checksum */ 591 if (arg) 592 tun->flags |= TUN_NOCHECKSUM; 593 else 594 tun->flags &= ~TUN_NOCHECKSUM; 595 596 DBG(KERN_INFO "%s: checksum %s\n", 597 tun->dev->name, arg ? "disabled" : "enabled"); 598 break; 599 600 case TUNSETPERSIST: 601 /* Disable/Enable persist mode */ 602 if (arg) 603 tun->flags |= TUN_PERSIST; 604 else 605 tun->flags &= ~TUN_PERSIST; 606 607 DBG(KERN_INFO "%s: persist %s\n", 608 tun->dev->name, arg ? "disabled" : "enabled"); 609 break; 610 611 case TUNSETOWNER: 612 /* Set owner of the device */ 613 tun->owner = (uid_t) arg; 614 615 DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner); 616 break; 617 618 case TUNSETLINK: 619 /* Only allow setting the type when the interface is down */ 620 if (tun->dev->flags & IFF_UP) { 621 DBG(KERN_INFO "%s: Linktype set failed because interface is up\n", 622 tun->dev->name); 623 return -EBUSY; 624 } else { 625 tun->dev->type = (int) arg; 626 DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type); 627 } 628 break; 629 630 #ifdef TUN_DEBUG 631 case TUNSETDEBUG: 632 tun->debug = arg; 633 break; 634 #endif 635 636 case SIOCGIFFLAGS: 637 ifr.ifr_flags = tun->if_flags; 638 if (copy_to_user( argp, &ifr, sizeof ifr)) 639 return -EFAULT; 640 return 0; 641 642 case SIOCSIFFLAGS: 643 /** Set the character device's interface flags. Currently only 644 * IFF_PROMISC and IFF_ALLMULTI are used. */ 645 tun->if_flags = ifr.ifr_flags; 646 DBG(KERN_INFO "%s: interface flags 0x%lx\n", 647 tun->dev->name, tun->if_flags); 648 return 0; 649 650 case SIOCGIFHWADDR: 651 memcpy(ifr.ifr_hwaddr.sa_data, tun->dev_addr, 652 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr)); 653 if (copy_to_user( argp, &ifr, sizeof ifr)) 654 return -EFAULT; 655 return 0; 656 657 case SIOCSIFHWADDR: 658 /** Set the character device's hardware address. This is used when 659 * filtering packets being sent from the network device to the character 660 * device. */ 661 memcpy(tun->dev_addr, ifr.ifr_hwaddr.sa_data, 662 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr)); 663 DBG(KERN_DEBUG "%s: set hardware address: %x:%x:%x:%x:%x:%x\n", 664 tun->dev->name, 665 tun->dev_addr[0], tun->dev_addr[1], tun->dev_addr[2], 666 tun->dev_addr[3], tun->dev_addr[4], tun->dev_addr[5]); 667 return 0; 668 669 case SIOCADDMULTI: 670 /** Add the specified group to the character device's multicast filter 671 * list. */ 672 add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data); 673 DBG(KERN_DEBUG "%s: add multi: %x:%x:%x:%x:%x:%x\n", 674 tun->dev->name, 675 (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1], 676 (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3], 677 (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]); 678 return 0; 679 680 case SIOCDELMULTI: 681 /** Remove the specified group from the character device's multicast 682 * filter list. */ 683 del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data); 684 DBG(KERN_DEBUG "%s: del multi: %x:%x:%x:%x:%x:%x\n", 685 tun->dev->name, 686 (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1], 687 (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3], 688 (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]); 689 return 0; 690 691 default: 692 return -EINVAL; 693 }; 694 695 return 0; 696 } 697 698 static int tun_chr_fasync(int fd, struct file *file, int on) 699 { 700 struct tun_struct *tun = file->private_data; 701 int ret; 702 703 if (!tun) 704 return -EBADFD; 705 706 DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on); 707 708 if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) 709 return ret; 710 711 if (on) { 712 ret = f_setown(file, current->pid, 0); 713 if (ret) 714 return ret; 715 tun->flags |= TUN_FASYNC; 716 } else 717 tun->flags &= ~TUN_FASYNC; 718 719 return 0; 720 } 721 722 static int tun_chr_open(struct inode *inode, struct file * file) 723 { 724 DBG1(KERN_INFO "tunX: tun_chr_open\n"); 725 file->private_data = NULL; 726 return 0; 727 } 728 729 static int tun_chr_close(struct inode *inode, struct file *file) 730 { 731 struct tun_struct *tun = file->private_data; 732 733 if (!tun) 734 return 0; 735 736 DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name); 737 738 tun_chr_fasync(-1, file, 0); 739 740 rtnl_lock(); 741 742 /* Detach from net device */ 743 file->private_data = NULL; 744 tun->attached = 0; 745 746 /* Drop read queue */ 747 skb_queue_purge(&tun->readq); 748 749 if (!(tun->flags & TUN_PERSIST)) { 750 list_del(&tun->list); 751 unregister_netdevice(tun->dev); 752 } 753 754 rtnl_unlock(); 755 756 return 0; 757 } 758 759 static struct file_operations tun_fops = { 760 .owner = THIS_MODULE, 761 .llseek = no_llseek, 762 .read = tun_chr_read, 763 .readv = tun_chr_readv, 764 .write = tun_chr_write, 765 .writev = tun_chr_writev, 766 .poll = tun_chr_poll, 767 .ioctl = tun_chr_ioctl, 768 .open = tun_chr_open, 769 .release = tun_chr_close, 770 .fasync = tun_chr_fasync 771 }; 772 773 static struct miscdevice tun_miscdev = { 774 .minor = TUN_MINOR, 775 .name = "tun", 776 .fops = &tun_fops, 777 .devfs_name = "net/tun", 778 }; 779 780 /* ethtool interface */ 781 782 static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) 783 { 784 cmd->supported = 0; 785 cmd->advertising = 0; 786 cmd->speed = SPEED_10; 787 cmd->duplex = DUPLEX_FULL; 788 cmd->port = PORT_TP; 789 cmd->phy_address = 0; 790 cmd->transceiver = XCVR_INTERNAL; 791 cmd->autoneg = AUTONEG_DISABLE; 792 cmd->maxtxpkt = 0; 793 cmd->maxrxpkt = 0; 794 return 0; 795 } 796 797 static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) 798 { 799 struct tun_struct *tun = netdev_priv(dev); 800 801 strcpy(info->driver, DRV_NAME); 802 strcpy(info->version, DRV_VERSION); 803 strcpy(info->fw_version, "N/A"); 804 805 switch (tun->flags & TUN_TYPE_MASK) { 806 case TUN_TUN_DEV: 807 strcpy(info->bus_info, "tun"); 808 break; 809 case TUN_TAP_DEV: 810 strcpy(info->bus_info, "tap"); 811 break; 812 } 813 } 814 815 static u32 tun_get_msglevel(struct net_device *dev) 816 { 817 #ifdef TUN_DEBUG 818 struct tun_struct *tun = netdev_priv(dev); 819 return tun->debug; 820 #else 821 return -EOPNOTSUPP; 822 #endif 823 } 824 825 static void tun_set_msglevel(struct net_device *dev, u32 value) 826 { 827 #ifdef TUN_DEBUG 828 struct tun_struct *tun = netdev_priv(dev); 829 tun->debug = value; 830 #endif 831 } 832 833 static u32 tun_get_link(struct net_device *dev) 834 { 835 struct tun_struct *tun = netdev_priv(dev); 836 return tun->attached; 837 } 838 839 static u32 tun_get_rx_csum(struct net_device *dev) 840 { 841 struct tun_struct *tun = netdev_priv(dev); 842 return (tun->flags & TUN_NOCHECKSUM) == 0; 843 } 844 845 static int tun_set_rx_csum(struct net_device *dev, u32 data) 846 { 847 struct tun_struct *tun = netdev_priv(dev); 848 if (data) 849 tun->flags &= ~TUN_NOCHECKSUM; 850 else 851 tun->flags |= TUN_NOCHECKSUM; 852 return 0; 853 } 854 855 static struct ethtool_ops tun_ethtool_ops = { 856 .get_settings = tun_get_settings, 857 .get_drvinfo = tun_get_drvinfo, 858 .get_msglevel = tun_get_msglevel, 859 .set_msglevel = tun_set_msglevel, 860 .get_link = tun_get_link, 861 .get_rx_csum = tun_get_rx_csum, 862 .set_rx_csum = tun_set_rx_csum 863 }; 864 865 static int __init tun_init(void) 866 { 867 int ret = 0; 868 869 printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION); 870 printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT); 871 872 ret = misc_register(&tun_miscdev); 873 if (ret) 874 printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR); 875 return ret; 876 } 877 878 static void tun_cleanup(void) 879 { 880 struct tun_struct *tun, *nxt; 881 882 misc_deregister(&tun_miscdev); 883 884 rtnl_lock(); 885 list_for_each_entry_safe(tun, nxt, &tun_dev_list, list) { 886 DBG(KERN_INFO "%s cleaned up\n", tun->dev->name); 887 unregister_netdevice(tun->dev); 888 } 889 rtnl_unlock(); 890 891 } 892 893 module_init(tun_init); 894 module_exit(tun_cleanup); 895 MODULE_DESCRIPTION(DRV_DESCRIPTION); 896 MODULE_AUTHOR(DRV_COPYRIGHT); 897 MODULE_LICENSE("GPL"); 898 MODULE_ALIAS_MISCDEV(TUN_MINOR); 899