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/smp_lock.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>
58 #include <linux/if_arp.h>
59 #include <linux/if_ether.h>
60 #include <linux/if_tun.h>
61 #include <linux/crc32.h>
62 #include <linux/nsproxy.h>
63 #include <linux/virtio_net.h>
64 #include <net/net_namespace.h>
65 #include <net/netns/generic.h>
67 #include <asm/system.h>
68 #include <asm/uaccess.h>
70 /* Uncomment to enable debugging */
71 /* #define TUN_DEBUG 1 */
76 #define DBG if(tun->debug)printk
77 #define DBG1 if(debug==2)printk
83 #define FLT_EXACT_COUNT 8
85 unsigned int count; /* Number of addrs. Zero means disabled */
86 u32 mask[2]; /* Mask of the hashed addrs */
87 unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN];
91 struct tun_struct *tun;
93 wait_queue_head_t read_wait;
97 struct tun_file *tfile;
102 struct sk_buff_head readq;
104 struct net_device *dev;
105 struct fasync_struct *fasync;
107 struct tap_filter txflt;
114 static int tun_attach(struct tun_struct *tun, struct file *file)
116 struct tun_file *tfile = file->private_data;
117 const struct cred *cred = current_cred();
122 /* Check permissions */
123 if (((tun->owner != -1 && cred->euid != tun->owner) ||
124 (tun->group != -1 && cred->egid != tun->group)) &&
125 !capable(CAP_NET_ADMIN))
128 netif_tx_lock_bh(tun->dev);
143 netif_tx_unlock_bh(tun->dev);
147 static void __tun_detach(struct tun_struct *tun)
149 struct tun_file *tfile = tun->tfile;
151 /* Detach from net device */
152 netif_tx_lock_bh(tun->dev);
155 netif_tx_unlock_bh(tun->dev);
157 /* Drop read queue */
158 skb_queue_purge(&tun->readq);
161 static struct tun_struct *__tun_get(struct tun_file *tfile)
166 static struct tun_struct *tun_get(struct file *file)
168 return __tun_get(file->private_data);
171 static void tun_put(struct tun_struct *tun)
177 static void addr_hash_set(u32 *mask, const u8 *addr)
179 int n = ether_crc(ETH_ALEN, addr) >> 26;
180 mask[n >> 5] |= (1 << (n & 31));
183 static unsigned int addr_hash_test(const u32 *mask, const u8 *addr)
185 int n = ether_crc(ETH_ALEN, addr) >> 26;
186 return mask[n >> 5] & (1 << (n & 31));
189 static int update_filter(struct tap_filter *filter, void __user *arg)
191 struct { u8 u[ETH_ALEN]; } *addr;
192 struct tun_filter uf;
193 int err, alen, n, nexact;
195 if (copy_from_user(&uf, arg, sizeof(uf)))
204 alen = ETH_ALEN * uf.count;
205 addr = kmalloc(alen, GFP_KERNEL);
209 if (copy_from_user(addr, arg + sizeof(uf), alen)) {
214 /* The filter is updated without holding any locks. Which is
215 * perfectly safe. We disable it first and in the worst
216 * case we'll accept a few undesired packets. */
220 /* Use first set of addresses as an exact filter */
221 for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++)
222 memcpy(filter->addr[n], addr[n].u, ETH_ALEN);
226 /* The rest is hashed */
227 memset(filter->mask, 0, sizeof(filter->mask));
228 for (; n < uf.count; n++)
229 addr_hash_set(filter->mask, addr[n].u);
231 /* For ALLMULTI just set the mask to all ones.
232 * This overrides the mask populated above. */
233 if ((uf.flags & TUN_FLT_ALLMULTI))
234 memset(filter->mask, ~0, sizeof(filter->mask));
236 /* Now enable the filter */
238 filter->count = nexact;
240 /* Return the number of exact filters */
248 /* Returns: 0 - drop, !=0 - accept */
249 static int run_filter(struct tap_filter *filter, const struct sk_buff *skb)
251 /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect
253 struct ethhdr *eh = (struct ethhdr *) skb->data;
257 for (i = 0; i < filter->count; i++)
258 if (!compare_ether_addr(eh->h_dest, filter->addr[i]))
261 /* Inexact match (multicast only) */
262 if (is_multicast_ether_addr(eh->h_dest))
263 return addr_hash_test(filter->mask, eh->h_dest);
269 * Checks whether the packet is accepted or not.
270 * Returns: 0 - drop, !=0 - accept
272 static int check_filter(struct tap_filter *filter, const struct sk_buff *skb)
277 return run_filter(filter, skb);
280 /* Network device part of the driver */
282 static const struct ethtool_ops tun_ethtool_ops;
284 /* Net device open. */
285 static int tun_net_open(struct net_device *dev)
287 netif_start_queue(dev);
291 /* Net device close. */
292 static int tun_net_close(struct net_device *dev)
294 netif_stop_queue(dev);
298 /* Net device start xmit */
299 static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
301 struct tun_struct *tun = netdev_priv(dev);
303 DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len);
305 /* Drop packet if interface is not attached */
309 /* Drop if the filter does not like it.
310 * This is a noop if the filter is disabled.
311 * Filter can be enabled only for the TAP devices. */
312 if (!check_filter(&tun->txflt, skb))
315 if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) {
316 if (!(tun->flags & TUN_ONE_QUEUE)) {
317 /* Normal queueing mode. */
318 /* Packet scheduler handles dropping of further packets. */
319 netif_stop_queue(dev);
321 /* We won't see all dropped packets individually, so overrun
322 * error is more appropriate. */
323 dev->stats.tx_fifo_errors++;
325 /* Single queue mode.
326 * Driver handles dropping of all packets itself. */
332 skb_queue_tail(&tun->readq, skb);
333 dev->trans_start = jiffies;
335 /* Notify and wake up reader process */
336 if (tun->flags & TUN_FASYNC)
337 kill_fasync(&tun->fasync, SIGIO, POLL_IN);
338 wake_up_interruptible(&tun->tfile->read_wait);
342 dev->stats.tx_dropped++;
347 static void tun_net_mclist(struct net_device *dev)
350 * This callback is supposed to deal with mc filter in
351 * _rx_ path and has nothing to do with the _tx_ path.
352 * In rx path we always accept everything userspace gives us.
358 #define MAX_MTU 65535
361 tun_net_change_mtu(struct net_device *dev, int new_mtu)
363 if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU)
369 static const struct net_device_ops tun_netdev_ops = {
370 .ndo_open = tun_net_open,
371 .ndo_stop = tun_net_close,
372 .ndo_start_xmit = tun_net_xmit,
373 .ndo_change_mtu = tun_net_change_mtu,
376 static const struct net_device_ops tap_netdev_ops = {
377 .ndo_open = tun_net_open,
378 .ndo_stop = tun_net_close,
379 .ndo_start_xmit = tun_net_xmit,
380 .ndo_change_mtu = tun_net_change_mtu,
381 .ndo_set_multicast_list = tun_net_mclist,
382 .ndo_set_mac_address = eth_mac_addr,
383 .ndo_validate_addr = eth_validate_addr,
386 /* Initialize net device. */
387 static void tun_net_init(struct net_device *dev)
389 struct tun_struct *tun = netdev_priv(dev);
391 switch (tun->flags & TUN_TYPE_MASK) {
393 dev->netdev_ops = &tun_netdev_ops;
395 /* Point-to-Point TUN Device */
396 dev->hard_header_len = 0;
400 /* Zero header length */
401 dev->type = ARPHRD_NONE;
402 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
403 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
407 dev->netdev_ops = &tap_netdev_ops;
408 /* Ethernet TAP Device */
411 random_ether_addr(dev->dev_addr);
413 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
418 /* Character device part */
421 static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
423 struct tun_file *tfile = file->private_data;
424 struct tun_struct *tun = __tun_get(tfile);
425 unsigned int mask = POLLOUT | POLLWRNORM;
430 DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name);
432 poll_wait(file, &tfile->read_wait, wait);
434 if (!skb_queue_empty(&tun->readq))
435 mask |= POLLIN | POLLRDNORM;
441 /* prepad is the amount to reserve at front. len is length after that.
442 * linear is a hint as to how much to copy (usually headers). */
443 static struct sk_buff *tun_alloc_skb(size_t prepad, size_t len, size_t linear,
449 skb = alloc_skb(prepad + len, gfp|__GFP_NOWARN);
451 skb_reserve(skb, prepad);
456 /* Under a page? Don't bother with paged skb. */
457 if (prepad + len < PAGE_SIZE)
460 /* Start with a normal skb, and add pages. */
461 skb = alloc_skb(prepad + linear, gfp);
465 skb_reserve(skb, prepad);
466 skb_put(skb, linear);
470 for (i = 0; i < MAX_SKB_FRAGS; i++) {
471 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
473 f->page = alloc_page(gfp|__GFP_ZERO);
480 skb->data_len += PAGE_SIZE;
481 skb->len += PAGE_SIZE;
482 skb->truesize += PAGE_SIZE;
483 skb_shinfo(skb)->nr_frags++;
485 if (len < PAGE_SIZE) {
492 /* Too large, or alloc fail? */
501 /* Get packet from user space buffer */
502 static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count)
504 struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) };
506 size_t len = count, align = 0;
507 struct virtio_net_hdr gso = { 0 };
509 if (!(tun->flags & TUN_NO_PI)) {
510 if ((len -= sizeof(pi)) > count)
513 if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi)))
517 if (tun->flags & TUN_VNET_HDR) {
518 if ((len -= sizeof(gso)) > count)
521 if (memcpy_fromiovec((void *)&gso, iv, sizeof(gso)))
524 if (gso.hdr_len > len)
528 if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) {
529 align = NET_IP_ALIGN;
530 if (unlikely(len < ETH_HLEN))
534 if (!(skb = tun_alloc_skb(align, len, gso.hdr_len, GFP_KERNEL))) {
535 tun->dev->stats.rx_dropped++;
539 if (skb_copy_datagram_from_iovec(skb, 0, iv, len)) {
540 tun->dev->stats.rx_dropped++;
545 if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
546 if (!skb_partial_csum_set(skb, gso.csum_start,
548 tun->dev->stats.rx_frame_errors++;
552 } else if (tun->flags & TUN_NOCHECKSUM)
553 skb->ip_summed = CHECKSUM_UNNECESSARY;
555 switch (tun->flags & TUN_TYPE_MASK) {
557 if (tun->flags & TUN_NO_PI) {
558 switch (skb->data[0] & 0xf0) {
560 pi.proto = htons(ETH_P_IP);
563 pi.proto = htons(ETH_P_IPV6);
566 tun->dev->stats.rx_dropped++;
572 skb_reset_mac_header(skb);
573 skb->protocol = pi.proto;
577 skb->protocol = eth_type_trans(skb, tun->dev);
581 if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
583 switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
584 case VIRTIO_NET_HDR_GSO_TCPV4:
585 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
587 case VIRTIO_NET_HDR_GSO_TCPV6:
588 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
591 tun->dev->stats.rx_frame_errors++;
596 if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN)
597 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
599 skb_shinfo(skb)->gso_size = gso.gso_size;
600 if (skb_shinfo(skb)->gso_size == 0) {
601 tun->dev->stats.rx_frame_errors++;
606 /* Header must be checked, and gso_segs computed. */
607 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
608 skb_shinfo(skb)->gso_segs = 0;
613 tun->dev->stats.rx_packets++;
614 tun->dev->stats.rx_bytes += len;
619 static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv,
620 unsigned long count, loff_t pos)
622 struct tun_struct *tun = tun_get(iocb->ki_filp);
628 DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count);
630 result = tun_get_user(tun, (struct iovec *) iv, iov_length(iv, count));
636 /* Put packet to the user space buffer */
637 static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
639 struct iovec *iv, int len)
641 struct tun_pi pi = { 0, skb->protocol };
644 if (!(tun->flags & TUN_NO_PI)) {
645 if ((len -= sizeof(pi)) < 0)
648 if (len < skb->len) {
649 /* Packet will be striped */
650 pi.flags |= TUN_PKT_STRIP;
653 if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi)))
658 if (tun->flags & TUN_VNET_HDR) {
659 struct virtio_net_hdr gso = { 0 }; /* no info leak */
660 if ((len -= sizeof(gso)) < 0)
663 if (skb_is_gso(skb)) {
664 struct skb_shared_info *sinfo = skb_shinfo(skb);
666 /* This is a hint as to how much should be linear. */
667 gso.hdr_len = skb_headlen(skb);
668 gso.gso_size = sinfo->gso_size;
669 if (sinfo->gso_type & SKB_GSO_TCPV4)
670 gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
671 else if (sinfo->gso_type & SKB_GSO_TCPV6)
672 gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
675 if (sinfo->gso_type & SKB_GSO_TCP_ECN)
676 gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
678 gso.gso_type = VIRTIO_NET_HDR_GSO_NONE;
680 if (skb->ip_summed == CHECKSUM_PARTIAL) {
681 gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
682 gso.csum_start = skb->csum_start - skb_headroom(skb);
683 gso.csum_offset = skb->csum_offset;
684 } /* else everything is zero */
686 if (unlikely(memcpy_toiovec(iv, (void *)&gso, sizeof(gso))))
688 total += sizeof(gso);
691 len = min_t(int, skb->len, len);
693 skb_copy_datagram_iovec(skb, 0, iv, len);
696 tun->dev->stats.tx_packets++;
697 tun->dev->stats.tx_bytes += len;
702 static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
703 unsigned long count, loff_t pos)
705 struct file *file = iocb->ki_filp;
706 struct tun_file *tfile = file->private_data;
707 struct tun_struct *tun = __tun_get(tfile);
708 DECLARE_WAITQUEUE(wait, current);
710 ssize_t len, ret = 0;
715 DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name);
717 len = iov_length(iv, count);
723 add_wait_queue(&tfile->read_wait, &wait);
725 current->state = TASK_INTERRUPTIBLE;
727 /* Read frames from the queue */
728 if (!(skb=skb_dequeue(&tun->readq))) {
729 if (file->f_flags & O_NONBLOCK) {
733 if (signal_pending(current)) {
738 /* Nothing to read, let's sleep */
742 netif_wake_queue(tun->dev);
744 ret = tun_put_user(tun, skb, (struct iovec *) iv, len);
749 current->state = TASK_RUNNING;
750 remove_wait_queue(&tfile->read_wait, &wait);
757 static void tun_setup(struct net_device *dev)
759 struct tun_struct *tun = netdev_priv(dev);
761 skb_queue_head_init(&tun->readq);
766 dev->ethtool_ops = &tun_ethtool_ops;
767 dev->destructor = free_netdev;
768 dev->features |= NETIF_F_NETNS_LOCAL;
771 static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
773 struct tun_struct *tun;
774 struct net_device *dev;
777 dev = __dev_get_by_name(net, ifr->ifr_name);
779 if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops)
780 tun = netdev_priv(dev);
781 else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops)
782 tun = netdev_priv(dev);
786 err = tun_attach(tun, file);
792 unsigned long flags = 0;
796 if (!capable(CAP_NET_ADMIN))
800 if (ifr->ifr_flags & IFF_TUN) {
802 flags |= TUN_TUN_DEV;
804 } else if (ifr->ifr_flags & IFF_TAP) {
806 flags |= TUN_TAP_DEV;
812 name = ifr->ifr_name;
814 dev = alloc_netdev(sizeof(struct tun_struct), name,
819 dev_net_set(dev, net);
821 tun = netdev_priv(dev);
824 tun->txflt.count = 0;
828 if (strchr(dev->name, '%')) {
829 err = dev_alloc_name(dev, dev->name);
834 err = register_netdevice(tun->dev);
838 err = tun_attach(tun, file);
843 DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name);
845 if (ifr->ifr_flags & IFF_NO_PI)
846 tun->flags |= TUN_NO_PI;
848 tun->flags &= ~TUN_NO_PI;
850 if (ifr->ifr_flags & IFF_ONE_QUEUE)
851 tun->flags |= TUN_ONE_QUEUE;
853 tun->flags &= ~TUN_ONE_QUEUE;
855 if (ifr->ifr_flags & IFF_VNET_HDR)
856 tun->flags |= TUN_VNET_HDR;
858 tun->flags &= ~TUN_VNET_HDR;
860 /* Make sure persistent devices do not get stuck in
863 if (netif_running(tun->dev))
864 netif_wake_queue(tun->dev);
866 strcpy(ifr->ifr_name, tun->dev->name);
875 static int tun_get_iff(struct net *net, struct file *file, struct ifreq *ifr)
877 struct tun_struct *tun = tun_get(file);
882 DBG(KERN_INFO "%s: tun_get_iff\n", tun->dev->name);
884 strcpy(ifr->ifr_name, tun->dev->name);
888 if (ifr->ifr_flags & TUN_TUN_DEV)
889 ifr->ifr_flags |= IFF_TUN;
891 ifr->ifr_flags |= IFF_TAP;
893 if (tun->flags & TUN_NO_PI)
894 ifr->ifr_flags |= IFF_NO_PI;
896 if (tun->flags & TUN_ONE_QUEUE)
897 ifr->ifr_flags |= IFF_ONE_QUEUE;
899 if (tun->flags & TUN_VNET_HDR)
900 ifr->ifr_flags |= IFF_VNET_HDR;
906 /* This is like a cut-down ethtool ops, except done via tun fd so no
908 static int set_offload(struct net_device *dev, unsigned long arg)
910 unsigned int old_features, features;
912 old_features = dev->features;
913 /* Unset features, set them as we chew on the arg. */
914 features = (old_features & ~(NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST
915 |NETIF_F_TSO_ECN|NETIF_F_TSO|NETIF_F_TSO6));
917 if (arg & TUN_F_CSUM) {
918 features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
921 if (arg & (TUN_F_TSO4|TUN_F_TSO6)) {
922 if (arg & TUN_F_TSO_ECN) {
923 features |= NETIF_F_TSO_ECN;
924 arg &= ~TUN_F_TSO_ECN;
926 if (arg & TUN_F_TSO4)
927 features |= NETIF_F_TSO;
928 if (arg & TUN_F_TSO6)
929 features |= NETIF_F_TSO6;
930 arg &= ~(TUN_F_TSO4|TUN_F_TSO6);
934 /* This gives the user a way to test for new features in future by
935 * trying to set them. */
939 dev->features = features;
940 if (old_features != dev->features)
941 netdev_features_change(dev);
946 static int tun_chr_ioctl(struct inode *inode, struct file *file,
947 unsigned int cmd, unsigned long arg)
949 struct tun_file *tfile = file->private_data;
950 struct tun_struct *tun;
951 void __user* argp = (void __user*)arg;
955 if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89)
956 if (copy_from_user(&ifr, argp, sizeof ifr))
959 if (cmd == TUNGETFEATURES) {
960 /* Currently this just means: "what IFF flags are valid?".
961 * This is needed because we never checked for invalid flags on
963 return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE |
965 (unsigned int __user*)argp);
968 tun = __tun_get(tfile);
969 if (cmd == TUNSETIFF && !tun) {
972 ifr.ifr_name[IFNAMSIZ-1] = '\0';
975 err = tun_set_iff(tfile->net, file, &ifr);
981 if (copy_to_user(argp, &ifr, sizeof(ifr)))
990 DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd);
995 ret = tun_get_iff(current->nsproxy->net_ns, file, &ifr);
999 if (copy_to_user(argp, &ifr, sizeof(ifr)))
1004 /* Disable/Enable checksum */
1006 tun->flags |= TUN_NOCHECKSUM;
1008 tun->flags &= ~TUN_NOCHECKSUM;
1010 DBG(KERN_INFO "%s: checksum %s\n",
1011 tun->dev->name, arg ? "disabled" : "enabled");
1015 /* Disable/Enable persist mode */
1017 tun->flags |= TUN_PERSIST;
1019 tun->flags &= ~TUN_PERSIST;
1021 DBG(KERN_INFO "%s: persist %s\n",
1022 tun->dev->name, arg ? "enabled" : "disabled");
1026 /* Set owner of the device */
1027 tun->owner = (uid_t) arg;
1029 DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner);
1033 /* Set group of the device */
1034 tun->group= (gid_t) arg;
1036 DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group);
1040 /* Only allow setting the type when the interface is down */
1042 if (tun->dev->flags & IFF_UP) {
1043 DBG(KERN_INFO "%s: Linktype set failed because interface is up\n",
1047 tun->dev->type = (int) arg;
1048 DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type);
1061 ret = set_offload(tun->dev, arg);
1065 case TUNSETTXFILTER:
1066 /* Can be set only for TAPs */
1068 if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV)
1071 ret = update_filter(&tun->txflt, (void __user *)arg);
1077 memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN);
1078 ifr.ifr_hwaddr.sa_family = tun->dev->type;
1079 if (copy_to_user(argp, &ifr, sizeof ifr))
1084 /* Set hw address */
1085 DBG(KERN_DEBUG "%s: set hw address: %pM\n",
1086 tun->dev->name, ifr.ifr_hwaddr.sa_data);
1089 ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr);
1101 static int tun_chr_fasync(int fd, struct file *file, int on)
1103 struct tun_struct *tun = tun_get(file);
1109 DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on);
1112 if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0)
1116 ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0);
1119 tun->flags |= TUN_FASYNC;
1121 tun->flags &= ~TUN_FASYNC;
1129 static int tun_chr_open(struct inode *inode, struct file * file)
1131 struct tun_file *tfile;
1132 cycle_kernel_lock();
1133 DBG1(KERN_INFO "tunX: tun_chr_open\n");
1135 tfile = kmalloc(sizeof(*tfile), GFP_KERNEL);
1139 tfile->net = get_net(current->nsproxy->net_ns);
1140 init_waitqueue_head(&tfile->read_wait);
1141 file->private_data = tfile;
1145 static int tun_chr_close(struct inode *inode, struct file *file)
1147 struct tun_file *tfile = file->private_data;
1148 struct tun_struct *tun = __tun_get(tfile);
1152 DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name);
1157 /* If desireable, unregister the netdevice. */
1158 if (!(tun->flags & TUN_PERSIST))
1159 unregister_netdevice(tun->dev);
1164 put_net(tfile->net);
1170 static const struct file_operations tun_fops = {
1171 .owner = THIS_MODULE,
1172 .llseek = no_llseek,
1173 .read = do_sync_read,
1174 .aio_read = tun_chr_aio_read,
1175 .write = do_sync_write,
1176 .aio_write = tun_chr_aio_write,
1177 .poll = tun_chr_poll,
1178 .ioctl = tun_chr_ioctl,
1179 .open = tun_chr_open,
1180 .release = tun_chr_close,
1181 .fasync = tun_chr_fasync
1184 static struct miscdevice tun_miscdev = {
1190 /* ethtool interface */
1192 static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1195 cmd->advertising = 0;
1196 cmd->speed = SPEED_10;
1197 cmd->duplex = DUPLEX_FULL;
1198 cmd->port = PORT_TP;
1199 cmd->phy_address = 0;
1200 cmd->transceiver = XCVR_INTERNAL;
1201 cmd->autoneg = AUTONEG_DISABLE;
1207 static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1209 struct tun_struct *tun = netdev_priv(dev);
1211 strcpy(info->driver, DRV_NAME);
1212 strcpy(info->version, DRV_VERSION);
1213 strcpy(info->fw_version, "N/A");
1215 switch (tun->flags & TUN_TYPE_MASK) {
1217 strcpy(info->bus_info, "tun");
1220 strcpy(info->bus_info, "tap");
1225 static u32 tun_get_msglevel(struct net_device *dev)
1228 struct tun_struct *tun = netdev_priv(dev);
1235 static void tun_set_msglevel(struct net_device *dev, u32 value)
1238 struct tun_struct *tun = netdev_priv(dev);
1243 static u32 tun_get_link(struct net_device *dev)
1245 struct tun_struct *tun = netdev_priv(dev);
1246 return !!tun->tfile;
1249 static u32 tun_get_rx_csum(struct net_device *dev)
1251 struct tun_struct *tun = netdev_priv(dev);
1252 return (tun->flags & TUN_NOCHECKSUM) == 0;
1255 static int tun_set_rx_csum(struct net_device *dev, u32 data)
1257 struct tun_struct *tun = netdev_priv(dev);
1259 tun->flags &= ~TUN_NOCHECKSUM;
1261 tun->flags |= TUN_NOCHECKSUM;
1265 static const struct ethtool_ops tun_ethtool_ops = {
1266 .get_settings = tun_get_settings,
1267 .get_drvinfo = tun_get_drvinfo,
1268 .get_msglevel = tun_get_msglevel,
1269 .set_msglevel = tun_set_msglevel,
1270 .get_link = tun_get_link,
1271 .get_rx_csum = tun_get_rx_csum,
1272 .set_rx_csum = tun_set_rx_csum
1275 static int tun_init_net(struct net *net)
1280 static void tun_exit_net(struct net *net)
1282 struct net_device *dev, *next;
1285 for_each_netdev_safe(net, dev, next) {
1286 if (dev->ethtool_ops != &tun_ethtool_ops)
1288 DBG(KERN_INFO "%s cleaned up\n", dev->name);
1289 unregister_netdevice(dev);
1294 static struct pernet_operations tun_net_ops = {
1295 .init = tun_init_net,
1296 .exit = tun_exit_net,
1299 static int __init tun_init(void)
1303 printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION);
1304 printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT);
1306 ret = register_pernet_device(&tun_net_ops);
1308 printk(KERN_ERR "tun: Can't register pernet ops\n");
1312 ret = misc_register(&tun_miscdev);
1314 printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR);
1320 unregister_pernet_device(&tun_net_ops);
1325 static void tun_cleanup(void)
1327 misc_deregister(&tun_miscdev);
1328 unregister_pernet_device(&tun_net_ops);
1331 module_init(tun_init);
1332 module_exit(tun_cleanup);
1333 MODULE_DESCRIPTION(DRV_DESCRIPTION);
1334 MODULE_AUTHOR(DRV_COPYRIGHT);
1335 MODULE_LICENSE("GPL");
1336 MODULE_ALIAS_MISCDEV(TUN_MINOR);