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 * Brian Braunstein <linuxkernel@bristyle.com> 2007/03/23 22 * Fixed hw address handling. Now net_device.dev_addr is kept consistent 23 * with tun.dev_addr when the address is set by this module. 24 * 25 * Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14 26 * Add TUNSETLINK ioctl to set the link encapsulation 27 * 28 * Mark Smith <markzzzsmith@yahoo.com.au> 29 * Use random_ether_addr() for tap MAC address. 30 * 31 * Harald Roelle <harald.roelle@ifi.lmu.de> 2004/04/20 32 * Fixes in packet dropping, queue length setting and queue wakeup. 33 * Increased default tx queue length. 34 * Added ethtool API. 35 * Minor cleanups 36 * 37 * Daniel Podlejski <underley@underley.eu.org> 38 * Modifications for 2.3.99-pre5 kernel. 39 */ 40 41 #define DRV_NAME "tun" 42 #define DRV_VERSION "1.6" 43 #define DRV_DESCRIPTION "Universal TUN/TAP device driver" 44 #define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>" 45 46 #include <linux/module.h> 47 #include <linux/errno.h> 48 #include <linux/kernel.h> 49 #include <linux/major.h> 50 #include <linux/slab.h> 51 #include <linux/poll.h> 52 #include <linux/fcntl.h> 53 #include <linux/init.h> 54 #include <linux/skbuff.h> 55 #include <linux/netdevice.h> 56 #include <linux/etherdevice.h> 57 #include <linux/miscdevice.h> 58 #include <linux/ethtool.h> 59 #include <linux/rtnetlink.h> 60 #include <linux/if.h> 61 #include <linux/if_arp.h> 62 #include <linux/if_ether.h> 63 #include <linux/if_tun.h> 64 #include <linux/crc32.h> 65 66 #include <asm/system.h> 67 #include <asm/uaccess.h> 68 69 #ifdef TUN_DEBUG 70 static int debug; 71 #endif 72 73 /* Network device part of the driver */ 74 75 static LIST_HEAD(tun_dev_list); 76 static const struct ethtool_ops tun_ethtool_ops; 77 78 /* Net device open. */ 79 static int tun_net_open(struct net_device *dev) 80 { 81 netif_start_queue(dev); 82 return 0; 83 } 84 85 /* Net device close. */ 86 static int tun_net_close(struct net_device *dev) 87 { 88 netif_stop_queue(dev); 89 return 0; 90 } 91 92 /* Net device start xmit */ 93 static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev) 94 { 95 struct tun_struct *tun = netdev_priv(dev); 96 97 DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len); 98 99 /* Drop packet if interface is not attached */ 100 if (!tun->attached) 101 goto drop; 102 103 /* Packet dropping */ 104 if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) { 105 if (!(tun->flags & TUN_ONE_QUEUE)) { 106 /* Normal queueing mode. */ 107 /* Packet scheduler handles dropping of further packets. */ 108 netif_stop_queue(dev); 109 110 /* We won't see all dropped packets individually, so overrun 111 * error is more appropriate. */ 112 tun->stats.tx_fifo_errors++; 113 } else { 114 /* Single queue mode. 115 * Driver handles dropping of all packets itself. */ 116 goto drop; 117 } 118 } 119 120 /* Queue packet */ 121 skb_queue_tail(&tun->readq, skb); 122 dev->trans_start = jiffies; 123 124 /* Notify and wake up reader process */ 125 if (tun->flags & TUN_FASYNC) 126 kill_fasync(&tun->fasync, SIGIO, POLL_IN); 127 wake_up_interruptible(&tun->read_wait); 128 return 0; 129 130 drop: 131 tun->stats.tx_dropped++; 132 kfree_skb(skb); 133 return 0; 134 } 135 136 /** Add the specified Ethernet address to this multicast filter. */ 137 static void 138 add_multi(u32* filter, const u8* addr) 139 { 140 int bit_nr = ether_crc(ETH_ALEN, addr) >> 26; 141 filter[bit_nr >> 5] |= 1 << (bit_nr & 31); 142 } 143 144 /** Remove the specified Ethernet addres from this multicast filter. */ 145 static void 146 del_multi(u32* filter, const u8* addr) 147 { 148 int bit_nr = ether_crc(ETH_ALEN, addr) >> 26; 149 filter[bit_nr >> 5] &= ~(1 << (bit_nr & 31)); 150 } 151 152 /** Update the list of multicast groups to which the network device belongs. 153 * This list is used to filter packets being sent from the character device to 154 * the network device. */ 155 static void 156 tun_net_mclist(struct net_device *dev) 157 { 158 struct tun_struct *tun = netdev_priv(dev); 159 const struct dev_mc_list *mclist; 160 int i; 161 DBG(KERN_DEBUG "%s: tun_net_mclist: mc_count %d\n", 162 dev->name, dev->mc_count); 163 memset(tun->chr_filter, 0, sizeof tun->chr_filter); 164 for (i = 0, mclist = dev->mc_list; i < dev->mc_count && mclist != NULL; 165 i++, mclist = mclist->next) { 166 add_multi(tun->net_filter, mclist->dmi_addr); 167 DBG(KERN_DEBUG "%s: tun_net_mclist: %x:%x:%x:%x:%x:%x\n", 168 dev->name, 169 mclist->dmi_addr[0], mclist->dmi_addr[1], mclist->dmi_addr[2], 170 mclist->dmi_addr[3], mclist->dmi_addr[4], mclist->dmi_addr[5]); 171 } 172 } 173 174 static struct net_device_stats *tun_net_stats(struct net_device *dev) 175 { 176 struct tun_struct *tun = netdev_priv(dev); 177 return &tun->stats; 178 } 179 180 /* Initialize net device. */ 181 static void tun_net_init(struct net_device *dev) 182 { 183 struct tun_struct *tun = netdev_priv(dev); 184 185 switch (tun->flags & TUN_TYPE_MASK) { 186 case TUN_TUN_DEV: 187 /* Point-to-Point TUN Device */ 188 dev->hard_header_len = 0; 189 dev->addr_len = 0; 190 dev->mtu = 1500; 191 192 /* Zero header length */ 193 dev->type = ARPHRD_NONE; 194 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 195 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ 196 break; 197 198 case TUN_TAP_DEV: 199 /* Ethernet TAP Device */ 200 dev->set_multicast_list = tun_net_mclist; 201 202 ether_setup(dev); 203 204 /* random address already created for us by tun_set_iff, use it */ 205 memcpy(dev->dev_addr, tun->dev_addr, min(sizeof(tun->dev_addr), sizeof(dev->dev_addr)) ); 206 207 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ 208 break; 209 } 210 } 211 212 /* Character device part */ 213 214 /* Poll */ 215 static unsigned int tun_chr_poll(struct file *file, poll_table * wait) 216 { 217 struct tun_struct *tun = file->private_data; 218 unsigned int mask = POLLOUT | POLLWRNORM; 219 220 if (!tun) 221 return -EBADFD; 222 223 DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name); 224 225 poll_wait(file, &tun->read_wait, wait); 226 227 if (!skb_queue_empty(&tun->readq)) 228 mask |= POLLIN | POLLRDNORM; 229 230 return mask; 231 } 232 233 /* Get packet from user space buffer */ 234 static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count) 235 { 236 struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) }; 237 struct sk_buff *skb; 238 size_t len = count, align = 0; 239 240 if (!(tun->flags & TUN_NO_PI)) { 241 if ((len -= sizeof(pi)) > count) 242 return -EINVAL; 243 244 if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi))) 245 return -EFAULT; 246 } 247 248 if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) 249 align = NET_IP_ALIGN; 250 251 if (!(skb = alloc_skb(len + align, GFP_KERNEL))) { 252 tun->stats.rx_dropped++; 253 return -ENOMEM; 254 } 255 256 if (align) 257 skb_reserve(skb, align); 258 if (memcpy_fromiovec(skb_put(skb, len), iv, len)) { 259 tun->stats.rx_dropped++; 260 kfree_skb(skb); 261 return -EFAULT; 262 } 263 264 switch (tun->flags & TUN_TYPE_MASK) { 265 case TUN_TUN_DEV: 266 skb_reset_mac_header(skb); 267 skb->protocol = pi.proto; 268 skb->dev = tun->dev; 269 break; 270 case TUN_TAP_DEV: 271 skb->protocol = eth_type_trans(skb, tun->dev); 272 break; 273 }; 274 275 if (tun->flags & TUN_NOCHECKSUM) 276 skb->ip_summed = CHECKSUM_UNNECESSARY; 277 278 netif_rx_ni(skb); 279 tun->dev->last_rx = jiffies; 280 281 tun->stats.rx_packets++; 282 tun->stats.rx_bytes += len; 283 284 return count; 285 } 286 287 static inline size_t iov_total(const struct iovec *iv, unsigned long count) 288 { 289 unsigned long i; 290 size_t len; 291 292 for (i = 0, len = 0; i < count; i++) 293 len += iv[i].iov_len; 294 295 return len; 296 } 297 298 static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, 299 unsigned long count, loff_t pos) 300 { 301 struct tun_struct *tun = iocb->ki_filp->private_data; 302 303 if (!tun) 304 return -EBADFD; 305 306 DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count); 307 308 return tun_get_user(tun, (struct iovec *) iv, iov_total(iv, count)); 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 static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, 345 unsigned long count, loff_t pos) 346 { 347 struct file *file = iocb->ki_filp; 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 skb_copy_from_linear_data(skb, addr, min_t(size_t, sizeof addr, 397 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 static void tun_setup(struct net_device *dev) 428 { 429 struct tun_struct *tun = netdev_priv(dev); 430 431 skb_queue_head_init(&tun->readq); 432 init_waitqueue_head(&tun->read_wait); 433 434 tun->owner = -1; 435 436 SET_MODULE_OWNER(dev); 437 dev->open = tun_net_open; 438 dev->hard_start_xmit = tun_net_xmit; 439 dev->stop = tun_net_close; 440 dev->get_stats = tun_net_stats; 441 dev->ethtool_ops = &tun_ethtool_ops; 442 dev->destructor = free_netdev; 443 } 444 445 static struct tun_struct *tun_get_by_name(const char *name) 446 { 447 struct tun_struct *tun; 448 449 ASSERT_RTNL(); 450 list_for_each_entry(tun, &tun_dev_list, list) { 451 if (!strncmp(tun->dev->name, name, IFNAMSIZ)) 452 return tun; 453 } 454 455 return NULL; 456 } 457 458 static int tun_set_iff(struct file *file, struct ifreq *ifr) 459 { 460 struct tun_struct *tun; 461 struct net_device *dev; 462 int err; 463 464 tun = tun_get_by_name(ifr->ifr_name); 465 if (tun) { 466 if (tun->attached) 467 return -EBUSY; 468 469 /* Check permissions */ 470 if (tun->owner != -1 && 471 current->euid != tun->owner && !capable(CAP_NET_ADMIN)) 472 return -EPERM; 473 } 474 else if (__dev_get_by_name(ifr->ifr_name)) 475 return -EINVAL; 476 else { 477 char *name; 478 unsigned long flags = 0; 479 480 err = -EINVAL; 481 482 if (!capable(CAP_NET_ADMIN)) 483 return -EPERM; 484 485 /* Set dev type */ 486 if (ifr->ifr_flags & IFF_TUN) { 487 /* TUN device */ 488 flags |= TUN_TUN_DEV; 489 name = "tun%d"; 490 } else if (ifr->ifr_flags & IFF_TAP) { 491 /* TAP device */ 492 flags |= TUN_TAP_DEV; 493 name = "tap%d"; 494 } else 495 goto failed; 496 497 if (*ifr->ifr_name) 498 name = ifr->ifr_name; 499 500 dev = alloc_netdev(sizeof(struct tun_struct), name, 501 tun_setup); 502 if (!dev) 503 return -ENOMEM; 504 505 tun = netdev_priv(dev); 506 tun->dev = dev; 507 tun->flags = flags; 508 /* Be promiscuous by default to maintain previous behaviour. */ 509 tun->if_flags = IFF_PROMISC; 510 /* Generate random Ethernet address. */ 511 *(u16 *)tun->dev_addr = htons(0x00FF); 512 get_random_bytes(tun->dev_addr + sizeof(u16), 4); 513 memset(tun->chr_filter, 0, sizeof tun->chr_filter); 514 515 tun_net_init(dev); 516 517 if (strchr(dev->name, '%')) { 518 err = dev_alloc_name(dev, dev->name); 519 if (err < 0) 520 goto err_free_dev; 521 } 522 523 err = register_netdevice(tun->dev); 524 if (err < 0) 525 goto err_free_dev; 526 527 list_add(&tun->list, &tun_dev_list); 528 } 529 530 DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name); 531 532 if (ifr->ifr_flags & IFF_NO_PI) 533 tun->flags |= TUN_NO_PI; 534 535 if (ifr->ifr_flags & IFF_ONE_QUEUE) 536 tun->flags |= TUN_ONE_QUEUE; 537 538 file->private_data = tun; 539 tun->attached = 1; 540 541 strcpy(ifr->ifr_name, tun->dev->name); 542 return 0; 543 544 err_free_dev: 545 free_netdev(dev); 546 failed: 547 return err; 548 } 549 550 static int tun_chr_ioctl(struct inode *inode, struct file *file, 551 unsigned int cmd, unsigned long arg) 552 { 553 struct tun_struct *tun = file->private_data; 554 void __user* argp = (void __user*)arg; 555 struct ifreq ifr; 556 557 if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) 558 if (copy_from_user(&ifr, argp, sizeof ifr)) 559 return -EFAULT; 560 561 if (cmd == TUNSETIFF && !tun) { 562 int err; 563 564 ifr.ifr_name[IFNAMSIZ-1] = '\0'; 565 566 rtnl_lock(); 567 err = tun_set_iff(file, &ifr); 568 rtnl_unlock(); 569 570 if (err) 571 return err; 572 573 if (copy_to_user(argp, &ifr, sizeof(ifr))) 574 return -EFAULT; 575 return 0; 576 } 577 578 if (!tun) 579 return -EBADFD; 580 581 DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd); 582 583 switch (cmd) { 584 case TUNSETNOCSUM: 585 /* Disable/Enable checksum */ 586 if (arg) 587 tun->flags |= TUN_NOCHECKSUM; 588 else 589 tun->flags &= ~TUN_NOCHECKSUM; 590 591 DBG(KERN_INFO "%s: checksum %s\n", 592 tun->dev->name, arg ? "disabled" : "enabled"); 593 break; 594 595 case TUNSETPERSIST: 596 /* Disable/Enable persist mode */ 597 if (arg) 598 tun->flags |= TUN_PERSIST; 599 else 600 tun->flags &= ~TUN_PERSIST; 601 602 DBG(KERN_INFO "%s: persist %s\n", 603 tun->dev->name, arg ? "disabled" : "enabled"); 604 break; 605 606 case TUNSETOWNER: 607 /* Set owner of the device */ 608 tun->owner = (uid_t) arg; 609 610 DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner); 611 break; 612 613 case TUNSETLINK: 614 /* Only allow setting the type when the interface is down */ 615 if (tun->dev->flags & IFF_UP) { 616 DBG(KERN_INFO "%s: Linktype set failed because interface is up\n", 617 tun->dev->name); 618 return -EBUSY; 619 } else { 620 tun->dev->type = (int) arg; 621 DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type); 622 } 623 break; 624 625 #ifdef TUN_DEBUG 626 case TUNSETDEBUG: 627 tun->debug = arg; 628 break; 629 #endif 630 631 case SIOCGIFFLAGS: 632 ifr.ifr_flags = tun->if_flags; 633 if (copy_to_user( argp, &ifr, sizeof ifr)) 634 return -EFAULT; 635 return 0; 636 637 case SIOCSIFFLAGS: 638 /** Set the character device's interface flags. Currently only 639 * IFF_PROMISC and IFF_ALLMULTI are used. */ 640 tun->if_flags = ifr.ifr_flags; 641 DBG(KERN_INFO "%s: interface flags 0x%lx\n", 642 tun->dev->name, tun->if_flags); 643 return 0; 644 645 case SIOCGIFHWADDR: 646 /* Note: the actual net device's address may be different */ 647 memcpy(ifr.ifr_hwaddr.sa_data, tun->dev_addr, 648 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr)); 649 if (copy_to_user( argp, &ifr, sizeof ifr)) 650 return -EFAULT; 651 return 0; 652 653 case SIOCSIFHWADDR: 654 { 655 /* try to set the actual net device's hw address */ 656 int ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); 657 658 if (ret == 0) { 659 /** Set the character device's hardware address. This is used when 660 * filtering packets being sent from the network device to the character 661 * device. */ 662 memcpy(tun->dev_addr, ifr.ifr_hwaddr.sa_data, 663 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr)); 664 DBG(KERN_DEBUG "%s: set hardware address: %x:%x:%x:%x:%x:%x\n", 665 tun->dev->name, 666 tun->dev_addr[0], tun->dev_addr[1], tun->dev_addr[2], 667 tun->dev_addr[3], tun->dev_addr[4], tun->dev_addr[5]); 668 } 669 670 return ret; 671 } 672 673 case SIOCADDMULTI: 674 /** Add the specified group to the character device's multicast filter 675 * list. */ 676 add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data); 677 DBG(KERN_DEBUG "%s: add multi: %x:%x:%x:%x:%x:%x\n", 678 tun->dev->name, 679 (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1], 680 (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3], 681 (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]); 682 return 0; 683 684 case SIOCDELMULTI: 685 /** Remove the specified group from the character device's multicast 686 * filter list. */ 687 del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data); 688 DBG(KERN_DEBUG "%s: del multi: %x:%x:%x:%x:%x:%x\n", 689 tun->dev->name, 690 (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1], 691 (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3], 692 (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]); 693 return 0; 694 695 default: 696 return -EINVAL; 697 }; 698 699 return 0; 700 } 701 702 static int tun_chr_fasync(int fd, struct file *file, int on) 703 { 704 struct tun_struct *tun = file->private_data; 705 int ret; 706 707 if (!tun) 708 return -EBADFD; 709 710 DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on); 711 712 if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) 713 return ret; 714 715 if (on) { 716 ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); 717 if (ret) 718 return ret; 719 tun->flags |= TUN_FASYNC; 720 } else 721 tun->flags &= ~TUN_FASYNC; 722 723 return 0; 724 } 725 726 static int tun_chr_open(struct inode *inode, struct file * file) 727 { 728 DBG1(KERN_INFO "tunX: tun_chr_open\n"); 729 file->private_data = NULL; 730 return 0; 731 } 732 733 static int tun_chr_close(struct inode *inode, struct file *file) 734 { 735 struct tun_struct *tun = file->private_data; 736 737 if (!tun) 738 return 0; 739 740 DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name); 741 742 tun_chr_fasync(-1, file, 0); 743 744 rtnl_lock(); 745 746 /* Detach from net device */ 747 file->private_data = NULL; 748 tun->attached = 0; 749 750 /* Drop read queue */ 751 skb_queue_purge(&tun->readq); 752 753 if (!(tun->flags & TUN_PERSIST)) { 754 list_del(&tun->list); 755 unregister_netdevice(tun->dev); 756 } 757 758 rtnl_unlock(); 759 760 return 0; 761 } 762 763 static const struct file_operations tun_fops = { 764 .owner = THIS_MODULE, 765 .llseek = no_llseek, 766 .read = do_sync_read, 767 .aio_read = tun_chr_aio_read, 768 .write = do_sync_write, 769 .aio_write = tun_chr_aio_write, 770 .poll = tun_chr_poll, 771 .ioctl = tun_chr_ioctl, 772 .open = tun_chr_open, 773 .release = tun_chr_close, 774 .fasync = tun_chr_fasync 775 }; 776 777 static struct miscdevice tun_miscdev = { 778 .minor = TUN_MINOR, 779 .name = "tun", 780 .fops = &tun_fops, 781 }; 782 783 /* ethtool interface */ 784 785 static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) 786 { 787 cmd->supported = 0; 788 cmd->advertising = 0; 789 cmd->speed = SPEED_10; 790 cmd->duplex = DUPLEX_FULL; 791 cmd->port = PORT_TP; 792 cmd->phy_address = 0; 793 cmd->transceiver = XCVR_INTERNAL; 794 cmd->autoneg = AUTONEG_DISABLE; 795 cmd->maxtxpkt = 0; 796 cmd->maxrxpkt = 0; 797 return 0; 798 } 799 800 static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) 801 { 802 struct tun_struct *tun = netdev_priv(dev); 803 804 strcpy(info->driver, DRV_NAME); 805 strcpy(info->version, DRV_VERSION); 806 strcpy(info->fw_version, "N/A"); 807 808 switch (tun->flags & TUN_TYPE_MASK) { 809 case TUN_TUN_DEV: 810 strcpy(info->bus_info, "tun"); 811 break; 812 case TUN_TAP_DEV: 813 strcpy(info->bus_info, "tap"); 814 break; 815 } 816 } 817 818 static u32 tun_get_msglevel(struct net_device *dev) 819 { 820 #ifdef TUN_DEBUG 821 struct tun_struct *tun = netdev_priv(dev); 822 return tun->debug; 823 #else 824 return -EOPNOTSUPP; 825 #endif 826 } 827 828 static void tun_set_msglevel(struct net_device *dev, u32 value) 829 { 830 #ifdef TUN_DEBUG 831 struct tun_struct *tun = netdev_priv(dev); 832 tun->debug = value; 833 #endif 834 } 835 836 static u32 tun_get_link(struct net_device *dev) 837 { 838 struct tun_struct *tun = netdev_priv(dev); 839 return tun->attached; 840 } 841 842 static u32 tun_get_rx_csum(struct net_device *dev) 843 { 844 struct tun_struct *tun = netdev_priv(dev); 845 return (tun->flags & TUN_NOCHECKSUM) == 0; 846 } 847 848 static int tun_set_rx_csum(struct net_device *dev, u32 data) 849 { 850 struct tun_struct *tun = netdev_priv(dev); 851 if (data) 852 tun->flags &= ~TUN_NOCHECKSUM; 853 else 854 tun->flags |= TUN_NOCHECKSUM; 855 return 0; 856 } 857 858 static const struct ethtool_ops tun_ethtool_ops = { 859 .get_settings = tun_get_settings, 860 .get_drvinfo = tun_get_drvinfo, 861 .get_msglevel = tun_get_msglevel, 862 .set_msglevel = tun_set_msglevel, 863 .get_link = tun_get_link, 864 .get_rx_csum = tun_get_rx_csum, 865 .set_rx_csum = tun_set_rx_csum 866 }; 867 868 static int __init tun_init(void) 869 { 870 int ret = 0; 871 872 printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION); 873 printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT); 874 875 ret = misc_register(&tun_miscdev); 876 if (ret) 877 printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR); 878 return ret; 879 } 880 881 static void tun_cleanup(void) 882 { 883 struct tun_struct *tun, *nxt; 884 885 misc_deregister(&tun_miscdev); 886 887 rtnl_lock(); 888 list_for_each_entry_safe(tun, nxt, &tun_dev_list, list) { 889 DBG(KERN_INFO "%s cleaned up\n", tun->dev->name); 890 unregister_netdevice(tun->dev); 891 } 892 rtnl_unlock(); 893 894 } 895 896 module_init(tun_init); 897 module_exit(tun_cleanup); 898 MODULE_DESCRIPTION(DRV_DESCRIPTION); 899 MODULE_AUTHOR(DRV_COPYRIGHT); 900 MODULE_LICENSE("GPL"); 901 MODULE_ALIAS_MISCDEV(TUN_MINOR); 902