2 * TUN - Universal TUN/TAP device driver.
3 * Copyright (C) 1999-2002 Maxim Krasnyansky <maxk@qualcomm.com>
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.
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.
15 * $Id: tun.c,v 1.15 2002/03/01 02:44:24 maxk Exp $
21 * Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14
22 * Add TUNSETLINK ioctl to set the link encapsulation
24 * Mark Smith <markzzzsmith@yahoo.com.au>
25 * Use random_ether_addr() for tap MAC address.
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.
33 * Daniel Podlejski <underley@underley.eu.org>
34 * Modifications for 2.3.99-pre5 kernel.
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>"
42 #include <linux/module.h>
43 #include <linux/errno.h>
44 #include <linux/kernel.h>
45 #include <linux/major.h>
46 #include <linux/slab.h>
47 #include <linux/poll.h>
48 #include <linux/fcntl.h>
49 #include <linux/init.h>
50 #include <linux/skbuff.h>
51 #include <linux/netdevice.h>
52 #include <linux/etherdevice.h>
53 #include <linux/miscdevice.h>
54 #include <linux/ethtool.h>
55 #include <linux/rtnetlink.h>
57 #include <linux/if_arp.h>
58 #include <linux/if_ether.h>
59 #include <linux/if_tun.h>
60 #include <linux/crc32.h>
61 #include <linux/nsproxy.h>
62 #include <linux/virtio_net.h>
63 #include <net/net_namespace.h>
64 #include <net/netns/generic.h>
66 #include <asm/system.h>
67 #include <asm/uaccess.h>
69 /* Uncomment to enable debugging */
70 /* #define TUN_DEBUG 1 */
75 #define DBG if(tun->debug)printk
76 #define DBG1 if(debug==2)printk
82 #define FLT_EXACT_COUNT 8
84 unsigned int count; /* Number of addrs. Zero means disabled */
85 u32 mask[2]; /* Mask of the hashed addrs */
86 unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN];
90 struct list_head list;
96 wait_queue_head_t read_wait;
97 struct sk_buff_head readq;
99 struct net_device *dev;
100 struct fasync_struct *fasync;
102 struct tap_filter txflt;
110 static void addr_hash_set(u32 *mask, const u8 *addr)
112 int n = ether_crc(ETH_ALEN, addr) >> 26;
113 mask[n >> 5] |= (1 << (n & 31));
116 static unsigned int addr_hash_test(const u32 *mask, const u8 *addr)
118 int n = ether_crc(ETH_ALEN, addr) >> 26;
119 return mask[n >> 5] & (1 << (n & 31));
122 static int update_filter(struct tap_filter *filter, void __user *arg)
124 struct { u8 u[ETH_ALEN]; } *addr;
125 struct tun_filter uf;
126 int err, alen, n, nexact;
128 if (copy_from_user(&uf, arg, sizeof(uf)))
137 alen = ETH_ALEN * uf.count;
138 addr = kmalloc(alen, GFP_KERNEL);
142 if (copy_from_user(addr, arg + sizeof(uf), alen)) {
147 /* The filter is updated without holding any locks. Which is
148 * perfectly safe. We disable it first and in the worst
149 * case we'll accept a few undesired packets. */
153 /* Use first set of addresses as an exact filter */
154 for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++)
155 memcpy(filter->addr[n], addr[n].u, ETH_ALEN);
159 /* The rest is hashed */
160 memset(filter->mask, 0, sizeof(filter->mask));
161 for (; n < uf.count; n++)
162 addr_hash_set(filter->mask, addr[n].u);
164 /* For ALLMULTI just set the mask to all ones.
165 * This overrides the mask populated above. */
166 if ((uf.flags & TUN_FLT_ALLMULTI))
167 memset(filter->mask, ~0, sizeof(filter->mask));
169 /* Now enable the filter */
171 filter->count = nexact;
173 /* Return the number of exact filters */
181 /* Returns: 0 - drop, !=0 - accept */
182 static int run_filter(struct tap_filter *filter, const struct sk_buff *skb)
184 /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect
186 struct ethhdr *eh = (struct ethhdr *) skb->data;
190 for (i = 0; i < filter->count; i++)
191 if (!compare_ether_addr(eh->h_dest, filter->addr[i]))
194 /* Inexact match (multicast only) */
195 if (is_multicast_ether_addr(eh->h_dest))
196 return addr_hash_test(filter->mask, eh->h_dest);
202 * Checks whether the packet is accepted or not.
203 * Returns: 0 - drop, !=0 - accept
205 static int check_filter(struct tap_filter *filter, const struct sk_buff *skb)
210 return run_filter(filter, skb);
213 /* Network device part of the driver */
215 static unsigned int tun_net_id;
217 struct list_head dev_list;
220 static const struct ethtool_ops tun_ethtool_ops;
222 /* Net device open. */
223 static int tun_net_open(struct net_device *dev)
225 netif_start_queue(dev);
229 /* Net device close. */
230 static int tun_net_close(struct net_device *dev)
232 netif_stop_queue(dev);
236 /* Net device start xmit */
237 static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
239 struct tun_struct *tun = netdev_priv(dev);
241 DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len);
243 /* Drop packet if interface is not attached */
247 /* Drop if the filter does not like it.
248 * This is a noop if the filter is disabled.
249 * Filter can be enabled only for the TAP devices. */
250 if (!check_filter(&tun->txflt, skb))
253 if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) {
254 if (!(tun->flags & TUN_ONE_QUEUE)) {
255 /* Normal queueing mode. */
256 /* Packet scheduler handles dropping of further packets. */
257 netif_stop_queue(dev);
259 /* We won't see all dropped packets individually, so overrun
260 * error is more appropriate. */
261 dev->stats.tx_fifo_errors++;
263 /* Single queue mode.
264 * Driver handles dropping of all packets itself. */
270 skb_queue_tail(&tun->readq, skb);
271 dev->trans_start = jiffies;
273 /* Notify and wake up reader process */
274 if (tun->flags & TUN_FASYNC)
275 kill_fasync(&tun->fasync, SIGIO, POLL_IN);
276 wake_up_interruptible(&tun->read_wait);
280 dev->stats.tx_dropped++;
285 static void tun_net_mclist(struct net_device *dev)
288 * This callback is supposed to deal with mc filter in
289 * _rx_ path and has nothing to do with the _tx_ path.
290 * In rx path we always accept everything userspace gives us.
296 #define MAX_MTU 65535
299 tun_net_change_mtu(struct net_device *dev, int new_mtu)
301 if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU)
307 /* Initialize net device. */
308 static void tun_net_init(struct net_device *dev)
310 struct tun_struct *tun = netdev_priv(dev);
312 switch (tun->flags & TUN_TYPE_MASK) {
314 /* Point-to-Point TUN Device */
315 dev->hard_header_len = 0;
318 dev->change_mtu = tun_net_change_mtu;
320 /* Zero header length */
321 dev->type = ARPHRD_NONE;
322 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
323 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
327 /* Ethernet TAP Device */
329 dev->change_mtu = tun_net_change_mtu;
330 dev->set_multicast_list = tun_net_mclist;
332 random_ether_addr(dev->dev_addr);
334 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
339 /* Character device part */
342 static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
344 struct tun_struct *tun = file->private_data;
345 unsigned int mask = POLLOUT | POLLWRNORM;
350 DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name);
352 poll_wait(file, &tun->read_wait, wait);
354 if (!skb_queue_empty(&tun->readq))
355 mask |= POLLIN | POLLRDNORM;
360 /* Get packet from user space buffer */
361 static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count)
363 struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) };
365 size_t len = count, align = 0;
366 struct virtio_net_hdr gso = { 0 };
368 if (!(tun->flags & TUN_NO_PI)) {
369 if ((len -= sizeof(pi)) > count)
372 if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi)))
376 if (tun->flags & TUN_VNET_HDR) {
377 if ((len -= sizeof(gso)) > count)
380 if (memcpy_fromiovec((void *)&gso, iv, sizeof(gso)))
383 if (gso.hdr_len > len)
387 if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) {
388 align = NET_IP_ALIGN;
389 if (unlikely(len < ETH_HLEN))
393 if (!(skb = alloc_skb(len + align, GFP_KERNEL))) {
394 tun->dev->stats.rx_dropped++;
399 skb_reserve(skb, align);
400 if (memcpy_fromiovec(skb_put(skb, len), iv, len)) {
401 tun->dev->stats.rx_dropped++;
406 if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
407 if (!skb_partial_csum_set(skb, gso.csum_start,
409 tun->dev->stats.rx_frame_errors++;
413 } else if (tun->flags & TUN_NOCHECKSUM)
414 skb->ip_summed = CHECKSUM_UNNECESSARY;
416 switch (tun->flags & TUN_TYPE_MASK) {
418 if (tun->flags & TUN_NO_PI) {
419 switch (skb->data[0] & 0xf0) {
421 pi.proto = htons(ETH_P_IP);
424 pi.proto = htons(ETH_P_IPV6);
427 tun->dev->stats.rx_dropped++;
433 skb_reset_mac_header(skb);
434 skb->protocol = pi.proto;
438 skb->protocol = eth_type_trans(skb, tun->dev);
442 if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
444 switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
445 case VIRTIO_NET_HDR_GSO_TCPV4:
446 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
448 case VIRTIO_NET_HDR_GSO_TCPV6:
449 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
452 tun->dev->stats.rx_frame_errors++;
457 if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN)
458 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
460 skb_shinfo(skb)->gso_size = gso.gso_size;
461 if (skb_shinfo(skb)->gso_size == 0) {
462 tun->dev->stats.rx_frame_errors++;
467 /* Header must be checked, and gso_segs computed. */
468 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
469 skb_shinfo(skb)->gso_segs = 0;
473 tun->dev->last_rx = jiffies;
475 tun->dev->stats.rx_packets++;
476 tun->dev->stats.rx_bytes += len;
481 static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv,
482 unsigned long count, loff_t pos)
484 struct tun_struct *tun = iocb->ki_filp->private_data;
489 DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count);
491 return tun_get_user(tun, (struct iovec *) iv, iov_length(iv, count));
494 /* Put packet to the user space buffer */
495 static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
497 struct iovec *iv, int len)
499 struct tun_pi pi = { 0, skb->protocol };
502 if (!(tun->flags & TUN_NO_PI)) {
503 if ((len -= sizeof(pi)) < 0)
506 if (len < skb->len) {
507 /* Packet will be striped */
508 pi.flags |= TUN_PKT_STRIP;
511 if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi)))
516 if (tun->flags & TUN_VNET_HDR) {
517 struct virtio_net_hdr gso = { 0 }; /* no info leak */
518 if ((len -= sizeof(gso)) < 0)
521 if (skb_is_gso(skb)) {
522 struct skb_shared_info *sinfo = skb_shinfo(skb);
524 /* This is a hint as to how much should be linear. */
525 gso.hdr_len = skb_headlen(skb);
526 gso.gso_size = sinfo->gso_size;
527 if (sinfo->gso_type & SKB_GSO_TCPV4)
528 gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
529 else if (sinfo->gso_type & SKB_GSO_TCPV6)
530 gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
533 if (sinfo->gso_type & SKB_GSO_TCP_ECN)
534 gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
536 gso.gso_type = VIRTIO_NET_HDR_GSO_NONE;
538 if (skb->ip_summed == CHECKSUM_PARTIAL) {
539 gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
540 gso.csum_start = skb->csum_start - skb_headroom(skb);
541 gso.csum_offset = skb->csum_offset;
542 } /* else everything is zero */
544 if (unlikely(memcpy_toiovec(iv, (void *)&gso, sizeof(gso))))
546 total += sizeof(gso);
549 len = min_t(int, skb->len, len);
551 skb_copy_datagram_iovec(skb, 0, iv, len);
554 tun->dev->stats.tx_packets++;
555 tun->dev->stats.tx_bytes += len;
560 static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
561 unsigned long count, loff_t pos)
563 struct file *file = iocb->ki_filp;
564 struct tun_struct *tun = file->private_data;
565 DECLARE_WAITQUEUE(wait, current);
567 ssize_t len, ret = 0;
572 DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name);
574 len = iov_length(iv, count);
578 add_wait_queue(&tun->read_wait, &wait);
580 current->state = TASK_INTERRUPTIBLE;
582 /* Read frames from the queue */
583 if (!(skb=skb_dequeue(&tun->readq))) {
584 if (file->f_flags & O_NONBLOCK) {
588 if (signal_pending(current)) {
593 /* Nothing to read, let's sleep */
597 netif_wake_queue(tun->dev);
599 ret = tun_put_user(tun, skb, (struct iovec *) iv, len);
604 current->state = TASK_RUNNING;
605 remove_wait_queue(&tun->read_wait, &wait);
610 static void tun_setup(struct net_device *dev)
612 struct tun_struct *tun = netdev_priv(dev);
614 skb_queue_head_init(&tun->readq);
615 init_waitqueue_head(&tun->read_wait);
620 dev->open = tun_net_open;
621 dev->hard_start_xmit = tun_net_xmit;
622 dev->stop = tun_net_close;
623 dev->ethtool_ops = &tun_ethtool_ops;
624 dev->destructor = free_netdev;
625 dev->features |= NETIF_F_NETNS_LOCAL;
628 static struct tun_struct *tun_get_by_name(struct tun_net *tn, const char *name)
630 struct tun_struct *tun;
633 list_for_each_entry(tun, &tn->dev_list, list) {
634 if (!strncmp(tun->dev->name, name, IFNAMSIZ))
641 static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
644 struct tun_struct *tun;
645 struct net_device *dev;
648 tn = net_generic(net, tun_net_id);
649 tun = tun_get_by_name(tn, ifr->ifr_name);
654 /* Check permissions */
655 if (((tun->owner != -1 &&
656 current->euid != tun->owner) ||
658 current->egid != tun->group)) &&
659 !capable(CAP_NET_ADMIN))
662 else if (__dev_get_by_name(net, ifr->ifr_name))
666 unsigned long flags = 0;
670 if (!capable(CAP_NET_ADMIN))
674 if (ifr->ifr_flags & IFF_TUN) {
676 flags |= TUN_TUN_DEV;
678 } else if (ifr->ifr_flags & IFF_TAP) {
680 flags |= TUN_TAP_DEV;
686 name = ifr->ifr_name;
688 dev = alloc_netdev(sizeof(struct tun_struct), name,
693 dev_net_set(dev, net);
694 tun = netdev_priv(dev);
697 tun->txflt.count = 0;
701 if (strchr(dev->name, '%')) {
702 err = dev_alloc_name(dev, dev->name);
707 err = register_netdevice(tun->dev);
711 list_add(&tun->list, &tn->dev_list);
714 DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name);
716 if (ifr->ifr_flags & IFF_NO_PI)
717 tun->flags |= TUN_NO_PI;
719 tun->flags &= ~TUN_NO_PI;
721 if (ifr->ifr_flags & IFF_ONE_QUEUE)
722 tun->flags |= TUN_ONE_QUEUE;
724 tun->flags &= ~TUN_ONE_QUEUE;
726 if (ifr->ifr_flags & IFF_VNET_HDR)
727 tun->flags |= TUN_VNET_HDR;
729 tun->flags &= ~TUN_VNET_HDR;
731 file->private_data = tun;
733 get_net(dev_net(tun->dev));
735 /* Make sure persistent devices do not get stuck in
738 if (netif_running(tun->dev))
739 netif_wake_queue(tun->dev);
741 strcpy(ifr->ifr_name, tun->dev->name);
750 /* This is like a cut-down ethtool ops, except done via tun fd so no
752 static int set_offload(struct net_device *dev, unsigned long arg)
754 unsigned int old_features, features;
756 old_features = dev->features;
757 /* Unset features, set them as we chew on the arg. */
758 features = (old_features & ~(NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST
759 |NETIF_F_TSO_ECN|NETIF_F_TSO|NETIF_F_TSO6));
761 if (arg & TUN_F_CSUM) {
762 features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
765 if (arg & (TUN_F_TSO4|TUN_F_TSO6)) {
766 if (arg & TUN_F_TSO_ECN) {
767 features |= NETIF_F_TSO_ECN;
768 arg &= ~TUN_F_TSO_ECN;
770 if (arg & TUN_F_TSO4)
771 features |= NETIF_F_TSO;
772 if (arg & TUN_F_TSO6)
773 features |= NETIF_F_TSO6;
774 arg &= ~(TUN_F_TSO4|TUN_F_TSO6);
778 /* This gives the user a way to test for new features in future by
779 * trying to set them. */
783 dev->features = features;
784 if (old_features != dev->features)
785 netdev_features_change(dev);
790 static int tun_chr_ioctl(struct inode *inode, struct file *file,
791 unsigned int cmd, unsigned long arg)
793 struct tun_struct *tun = file->private_data;
794 void __user* argp = (void __user*)arg;
797 DECLARE_MAC_BUF(mac);
799 if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89)
800 if (copy_from_user(&ifr, argp, sizeof ifr))
803 if (cmd == TUNSETIFF && !tun) {
806 ifr.ifr_name[IFNAMSIZ-1] = '\0';
809 err = tun_set_iff(current->nsproxy->net_ns, file, &ifr);
815 if (copy_to_user(argp, &ifr, sizeof(ifr)))
820 if (cmd == TUNGETFEATURES) {
821 /* Currently this just means: "what IFF flags are valid?".
822 * This is needed because we never checked for invalid flags on
824 return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE |
826 (unsigned int __user*)argp);
832 DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd);
836 /* Disable/Enable checksum */
838 tun->flags |= TUN_NOCHECKSUM;
840 tun->flags &= ~TUN_NOCHECKSUM;
842 DBG(KERN_INFO "%s: checksum %s\n",
843 tun->dev->name, arg ? "disabled" : "enabled");
847 /* Disable/Enable persist mode */
849 tun->flags |= TUN_PERSIST;
851 tun->flags &= ~TUN_PERSIST;
853 DBG(KERN_INFO "%s: persist %s\n",
854 tun->dev->name, arg ? "enabled" : "disabled");
858 /* Set owner of the device */
859 tun->owner = (uid_t) arg;
861 DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner);
865 /* Set group of the device */
866 tun->group= (gid_t) arg;
868 DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group);
872 /* Only allow setting the type when the interface is down */
874 if (tun->dev->flags & IFF_UP) {
875 DBG(KERN_INFO "%s: Linktype set failed because interface is up\n",
879 tun->dev->type = (int) arg;
880 DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type);
893 ret = set_offload(tun->dev, arg);
898 /* Can be set only for TAPs */
899 if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV)
902 ret = update_filter(&tun->txflt, (void *) __user arg);
908 memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN);
909 ifr.ifr_hwaddr.sa_family = tun->dev->type;
910 if (copy_to_user(argp, &ifr, sizeof ifr))
916 DBG(KERN_DEBUG "%s: set hw address: %s\n",
917 tun->dev->name, print_mac(mac, ifr.ifr_hwaddr.sa_data));
920 ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr);
931 static int tun_chr_fasync(int fd, struct file *file, int on)
933 struct tun_struct *tun = file->private_data;
939 DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on);
941 if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0)
945 ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0);
948 tun->flags |= TUN_FASYNC;
950 tun->flags &= ~TUN_FASYNC;
955 static int tun_chr_open(struct inode *inode, struct file * file)
957 DBG1(KERN_INFO "tunX: tun_chr_open\n");
958 file->private_data = NULL;
962 static int tun_chr_close(struct inode *inode, struct file *file)
964 struct tun_struct *tun = file->private_data;
969 DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name);
971 tun_chr_fasync(-1, file, 0);
975 /* Detach from net device */
976 file->private_data = NULL;
978 put_net(dev_net(tun->dev));
980 /* Drop read queue */
981 skb_queue_purge(&tun->readq);
983 if (!(tun->flags & TUN_PERSIST)) {
984 list_del(&tun->list);
985 unregister_netdevice(tun->dev);
993 static const struct file_operations tun_fops = {
994 .owner = THIS_MODULE,
996 .read = do_sync_read,
997 .aio_read = tun_chr_aio_read,
998 .write = do_sync_write,
999 .aio_write = tun_chr_aio_write,
1000 .poll = tun_chr_poll,
1001 .ioctl = tun_chr_ioctl,
1002 .open = tun_chr_open,
1003 .release = tun_chr_close,
1004 .fasync = tun_chr_fasync
1007 static struct miscdevice tun_miscdev = {
1013 /* ethtool interface */
1015 static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1018 cmd->advertising = 0;
1019 cmd->speed = SPEED_10;
1020 cmd->duplex = DUPLEX_FULL;
1021 cmd->port = PORT_TP;
1022 cmd->phy_address = 0;
1023 cmd->transceiver = XCVR_INTERNAL;
1024 cmd->autoneg = AUTONEG_DISABLE;
1030 static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1032 struct tun_struct *tun = netdev_priv(dev);
1034 strcpy(info->driver, DRV_NAME);
1035 strcpy(info->version, DRV_VERSION);
1036 strcpy(info->fw_version, "N/A");
1038 switch (tun->flags & TUN_TYPE_MASK) {
1040 strcpy(info->bus_info, "tun");
1043 strcpy(info->bus_info, "tap");
1048 static u32 tun_get_msglevel(struct net_device *dev)
1051 struct tun_struct *tun = netdev_priv(dev);
1058 static void tun_set_msglevel(struct net_device *dev, u32 value)
1061 struct tun_struct *tun = netdev_priv(dev);
1066 static u32 tun_get_link(struct net_device *dev)
1068 struct tun_struct *tun = netdev_priv(dev);
1069 return tun->attached;
1072 static u32 tun_get_rx_csum(struct net_device *dev)
1074 struct tun_struct *tun = netdev_priv(dev);
1075 return (tun->flags & TUN_NOCHECKSUM) == 0;
1078 static int tun_set_rx_csum(struct net_device *dev, u32 data)
1080 struct tun_struct *tun = netdev_priv(dev);
1082 tun->flags &= ~TUN_NOCHECKSUM;
1084 tun->flags |= TUN_NOCHECKSUM;
1088 static const struct ethtool_ops tun_ethtool_ops = {
1089 .get_settings = tun_get_settings,
1090 .get_drvinfo = tun_get_drvinfo,
1091 .get_msglevel = tun_get_msglevel,
1092 .set_msglevel = tun_set_msglevel,
1093 .get_link = tun_get_link,
1094 .get_rx_csum = tun_get_rx_csum,
1095 .set_rx_csum = tun_set_rx_csum
1098 static int tun_init_net(struct net *net)
1102 tn = kmalloc(sizeof(*tn), GFP_KERNEL);
1106 INIT_LIST_HEAD(&tn->dev_list);
1108 if (net_assign_generic(net, tun_net_id, tn)) {
1116 static void tun_exit_net(struct net *net)
1119 struct tun_struct *tun, *nxt;
1121 tn = net_generic(net, tun_net_id);
1124 list_for_each_entry_safe(tun, nxt, &tn->dev_list, list) {
1125 DBG(KERN_INFO "%s cleaned up\n", tun->dev->name);
1126 unregister_netdevice(tun->dev);
1133 static struct pernet_operations tun_net_ops = {
1134 .init = tun_init_net,
1135 .exit = tun_exit_net,
1138 static int __init tun_init(void)
1142 printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION);
1143 printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT);
1145 ret = register_pernet_gen_device(&tun_net_id, &tun_net_ops);
1147 printk(KERN_ERR "tun: Can't register pernet ops\n");
1151 ret = misc_register(&tun_miscdev);
1153 printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR);
1159 unregister_pernet_gen_device(tun_net_id, &tun_net_ops);
1164 static void tun_cleanup(void)
1166 misc_deregister(&tun_miscdev);
1167 unregister_pernet_gen_device(tun_net_id, &tun_net_ops);
1170 module_init(tun_init);
1171 module_exit(tun_cleanup);
1172 MODULE_DESCRIPTION(DRV_DESCRIPTION);
1173 MODULE_AUTHOR(DRV_COPYRIGHT);
1174 MODULE_LICENSE("GPL");
1175 MODULE_ALIAS_MISCDEV(TUN_MINOR);