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];
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 const struct ethtool_ops tun_ethtool_ops;
217 /* Net device open. */
218 static int tun_net_open(struct net_device *dev)
220 netif_start_queue(dev);
224 /* Net device close. */
225 static int tun_net_close(struct net_device *dev)
227 netif_stop_queue(dev);
231 /* Net device start xmit */
232 static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
234 struct tun_struct *tun = netdev_priv(dev);
236 DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len);
238 /* Drop packet if interface is not attached */
242 /* Drop if the filter does not like it.
243 * This is a noop if the filter is disabled.
244 * Filter can be enabled only for the TAP devices. */
245 if (!check_filter(&tun->txflt, skb))
248 if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) {
249 if (!(tun->flags & TUN_ONE_QUEUE)) {
250 /* Normal queueing mode. */
251 /* Packet scheduler handles dropping of further packets. */
252 netif_stop_queue(dev);
254 /* We won't see all dropped packets individually, so overrun
255 * error is more appropriate. */
256 dev->stats.tx_fifo_errors++;
258 /* Single queue mode.
259 * Driver handles dropping of all packets itself. */
265 skb_queue_tail(&tun->readq, skb);
266 dev->trans_start = jiffies;
268 /* Notify and wake up reader process */
269 if (tun->flags & TUN_FASYNC)
270 kill_fasync(&tun->fasync, SIGIO, POLL_IN);
271 wake_up_interruptible(&tun->read_wait);
275 dev->stats.tx_dropped++;
280 static void tun_net_mclist(struct net_device *dev)
283 * This callback is supposed to deal with mc filter in
284 * _rx_ path and has nothing to do with the _tx_ path.
285 * In rx path we always accept everything userspace gives us.
291 #define MAX_MTU 65535
294 tun_net_change_mtu(struct net_device *dev, int new_mtu)
296 if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU)
302 static const struct net_device_ops tun_netdev_ops = {
303 .ndo_open = tun_net_open,
304 .ndo_stop = tun_net_close,
305 .ndo_start_xmit = tun_net_xmit,
306 .ndo_change_mtu = tun_net_change_mtu,
309 static const struct net_device_ops tap_netdev_ops = {
310 .ndo_open = tun_net_open,
311 .ndo_stop = tun_net_close,
312 .ndo_start_xmit = tun_net_xmit,
313 .ndo_change_mtu = tun_net_change_mtu,
314 .ndo_set_multicast_list = tun_net_mclist,
315 .ndo_set_mac_address = eth_mac_addr,
316 .ndo_validate_addr = eth_validate_addr,
319 /* Initialize net device. */
320 static void tun_net_init(struct net_device *dev)
322 struct tun_struct *tun = netdev_priv(dev);
324 switch (tun->flags & TUN_TYPE_MASK) {
326 dev->netdev_ops = &tun_netdev_ops;
328 /* Point-to-Point TUN Device */
329 dev->hard_header_len = 0;
333 /* Zero header length */
334 dev->type = ARPHRD_NONE;
335 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
336 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
340 dev->netdev_ops = &tap_netdev_ops;
341 /* Ethernet TAP Device */
344 random_ether_addr(dev->dev_addr);
346 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
351 /* Character device part */
354 static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
356 struct tun_struct *tun = file->private_data;
357 unsigned int mask = POLLOUT | POLLWRNORM;
362 DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name);
364 poll_wait(file, &tun->read_wait, wait);
366 if (!skb_queue_empty(&tun->readq))
367 mask |= POLLIN | POLLRDNORM;
372 /* prepad is the amount to reserve at front. len is length after that.
373 * linear is a hint as to how much to copy (usually headers). */
374 static struct sk_buff *tun_alloc_skb(size_t prepad, size_t len, size_t linear,
380 skb = alloc_skb(prepad + len, gfp|__GFP_NOWARN);
382 skb_reserve(skb, prepad);
387 /* Under a page? Don't bother with paged skb. */
388 if (prepad + len < PAGE_SIZE)
391 /* Start with a normal skb, and add pages. */
392 skb = alloc_skb(prepad + linear, gfp);
396 skb_reserve(skb, prepad);
397 skb_put(skb, linear);
401 for (i = 0; i < MAX_SKB_FRAGS; i++) {
402 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
404 f->page = alloc_page(gfp|__GFP_ZERO);
411 skb->data_len += PAGE_SIZE;
412 skb->len += PAGE_SIZE;
413 skb->truesize += PAGE_SIZE;
414 skb_shinfo(skb)->nr_frags++;
416 if (len < PAGE_SIZE) {
423 /* Too large, or alloc fail? */
432 /* Get packet from user space buffer */
433 static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count)
435 struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) };
437 size_t len = count, align = 0;
438 struct virtio_net_hdr gso = { 0 };
440 if (!(tun->flags & TUN_NO_PI)) {
441 if ((len -= sizeof(pi)) > count)
444 if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi)))
448 if (tun->flags & TUN_VNET_HDR) {
449 if ((len -= sizeof(gso)) > count)
452 if (memcpy_fromiovec((void *)&gso, iv, sizeof(gso)))
455 if (gso.hdr_len > len)
459 if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) {
460 align = NET_IP_ALIGN;
461 if (unlikely(len < ETH_HLEN))
465 if (!(skb = tun_alloc_skb(align, len, gso.hdr_len, GFP_KERNEL))) {
466 tun->dev->stats.rx_dropped++;
470 if (skb_copy_datagram_from_iovec(skb, 0, iv, len)) {
471 tun->dev->stats.rx_dropped++;
476 if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
477 if (!skb_partial_csum_set(skb, gso.csum_start,
479 tun->dev->stats.rx_frame_errors++;
483 } else if (tun->flags & TUN_NOCHECKSUM)
484 skb->ip_summed = CHECKSUM_UNNECESSARY;
486 switch (tun->flags & TUN_TYPE_MASK) {
488 if (tun->flags & TUN_NO_PI) {
489 switch (skb->data[0] & 0xf0) {
491 pi.proto = htons(ETH_P_IP);
494 pi.proto = htons(ETH_P_IPV6);
497 tun->dev->stats.rx_dropped++;
503 skb_reset_mac_header(skb);
504 skb->protocol = pi.proto;
508 skb->protocol = eth_type_trans(skb, tun->dev);
512 if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
514 switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
515 case VIRTIO_NET_HDR_GSO_TCPV4:
516 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
518 case VIRTIO_NET_HDR_GSO_TCPV6:
519 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
522 tun->dev->stats.rx_frame_errors++;
527 if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN)
528 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
530 skb_shinfo(skb)->gso_size = gso.gso_size;
531 if (skb_shinfo(skb)->gso_size == 0) {
532 tun->dev->stats.rx_frame_errors++;
537 /* Header must be checked, and gso_segs computed. */
538 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
539 skb_shinfo(skb)->gso_segs = 0;
544 tun->dev->stats.rx_packets++;
545 tun->dev->stats.rx_bytes += len;
550 static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv,
551 unsigned long count, loff_t pos)
553 struct tun_struct *tun = iocb->ki_filp->private_data;
558 DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count);
560 return tun_get_user(tun, (struct iovec *) iv, iov_length(iv, count));
563 /* Put packet to the user space buffer */
564 static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
566 struct iovec *iv, int len)
568 struct tun_pi pi = { 0, skb->protocol };
571 if (!(tun->flags & TUN_NO_PI)) {
572 if ((len -= sizeof(pi)) < 0)
575 if (len < skb->len) {
576 /* Packet will be striped */
577 pi.flags |= TUN_PKT_STRIP;
580 if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi)))
585 if (tun->flags & TUN_VNET_HDR) {
586 struct virtio_net_hdr gso = { 0 }; /* no info leak */
587 if ((len -= sizeof(gso)) < 0)
590 if (skb_is_gso(skb)) {
591 struct skb_shared_info *sinfo = skb_shinfo(skb);
593 /* This is a hint as to how much should be linear. */
594 gso.hdr_len = skb_headlen(skb);
595 gso.gso_size = sinfo->gso_size;
596 if (sinfo->gso_type & SKB_GSO_TCPV4)
597 gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
598 else if (sinfo->gso_type & SKB_GSO_TCPV6)
599 gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
602 if (sinfo->gso_type & SKB_GSO_TCP_ECN)
603 gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
605 gso.gso_type = VIRTIO_NET_HDR_GSO_NONE;
607 if (skb->ip_summed == CHECKSUM_PARTIAL) {
608 gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
609 gso.csum_start = skb->csum_start - skb_headroom(skb);
610 gso.csum_offset = skb->csum_offset;
611 } /* else everything is zero */
613 if (unlikely(memcpy_toiovec(iv, (void *)&gso, sizeof(gso))))
615 total += sizeof(gso);
618 len = min_t(int, skb->len, len);
620 skb_copy_datagram_iovec(skb, 0, iv, len);
623 tun->dev->stats.tx_packets++;
624 tun->dev->stats.tx_bytes += len;
629 static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
630 unsigned long count, loff_t pos)
632 struct file *file = iocb->ki_filp;
633 struct tun_struct *tun = file->private_data;
634 DECLARE_WAITQUEUE(wait, current);
636 ssize_t len, ret = 0;
641 DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name);
643 len = iov_length(iv, count);
647 add_wait_queue(&tun->read_wait, &wait);
649 current->state = TASK_INTERRUPTIBLE;
651 /* Read frames from the queue */
652 if (!(skb=skb_dequeue(&tun->readq))) {
653 if (file->f_flags & O_NONBLOCK) {
657 if (signal_pending(current)) {
662 /* Nothing to read, let's sleep */
666 netif_wake_queue(tun->dev);
668 ret = tun_put_user(tun, skb, (struct iovec *) iv, len);
673 current->state = TASK_RUNNING;
674 remove_wait_queue(&tun->read_wait, &wait);
679 static void tun_setup(struct net_device *dev)
681 struct tun_struct *tun = netdev_priv(dev);
683 skb_queue_head_init(&tun->readq);
684 init_waitqueue_head(&tun->read_wait);
689 dev->ethtool_ops = &tun_ethtool_ops;
690 dev->destructor = free_netdev;
691 dev->features |= NETIF_F_NETNS_LOCAL;
694 static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
696 struct tun_struct *tun;
697 struct net_device *dev;
698 const struct cred *cred = current_cred();
701 dev = __dev_get_by_name(net, ifr->ifr_name);
703 if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops)
704 tun = netdev_priv(dev);
705 else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops)
706 tun = netdev_priv(dev);
713 /* Check permissions */
714 if (((tun->owner != -1 &&
715 cred->euid != tun->owner) ||
717 cred->egid != tun->group)) &&
718 !capable(CAP_NET_ADMIN)) {
724 unsigned long flags = 0;
728 if (!capable(CAP_NET_ADMIN))
732 if (ifr->ifr_flags & IFF_TUN) {
734 flags |= TUN_TUN_DEV;
736 } else if (ifr->ifr_flags & IFF_TAP) {
738 flags |= TUN_TAP_DEV;
744 name = ifr->ifr_name;
746 dev = alloc_netdev(sizeof(struct tun_struct), name,
751 dev_net_set(dev, net);
753 tun = netdev_priv(dev);
756 tun->txflt.count = 0;
760 if (strchr(dev->name, '%')) {
761 err = dev_alloc_name(dev, dev->name);
766 err = register_netdevice(tun->dev);
771 DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name);
773 if (ifr->ifr_flags & IFF_NO_PI)
774 tun->flags |= TUN_NO_PI;
776 tun->flags &= ~TUN_NO_PI;
778 if (ifr->ifr_flags & IFF_ONE_QUEUE)
779 tun->flags |= TUN_ONE_QUEUE;
781 tun->flags &= ~TUN_ONE_QUEUE;
783 if (ifr->ifr_flags & IFF_VNET_HDR)
784 tun->flags |= TUN_VNET_HDR;
786 tun->flags &= ~TUN_VNET_HDR;
788 file->private_data = tun;
790 get_net(dev_net(tun->dev));
792 /* Make sure persistent devices do not get stuck in
795 if (netif_running(tun->dev))
796 netif_wake_queue(tun->dev);
798 strcpy(ifr->ifr_name, tun->dev->name);
807 static int tun_get_iff(struct net *net, struct file *file, struct ifreq *ifr)
809 struct tun_struct *tun = file->private_data;
814 DBG(KERN_INFO "%s: tun_get_iff\n", tun->dev->name);
816 strcpy(ifr->ifr_name, tun->dev->name);
820 if (ifr->ifr_flags & TUN_TUN_DEV)
821 ifr->ifr_flags |= IFF_TUN;
823 ifr->ifr_flags |= IFF_TAP;
825 if (tun->flags & TUN_NO_PI)
826 ifr->ifr_flags |= IFF_NO_PI;
828 if (tun->flags & TUN_ONE_QUEUE)
829 ifr->ifr_flags |= IFF_ONE_QUEUE;
831 if (tun->flags & TUN_VNET_HDR)
832 ifr->ifr_flags |= IFF_VNET_HDR;
837 /* This is like a cut-down ethtool ops, except done via tun fd so no
839 static int set_offload(struct net_device *dev, unsigned long arg)
841 unsigned int old_features, features;
843 old_features = dev->features;
844 /* Unset features, set them as we chew on the arg. */
845 features = (old_features & ~(NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST
846 |NETIF_F_TSO_ECN|NETIF_F_TSO|NETIF_F_TSO6));
848 if (arg & TUN_F_CSUM) {
849 features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
852 if (arg & (TUN_F_TSO4|TUN_F_TSO6)) {
853 if (arg & TUN_F_TSO_ECN) {
854 features |= NETIF_F_TSO_ECN;
855 arg &= ~TUN_F_TSO_ECN;
857 if (arg & TUN_F_TSO4)
858 features |= NETIF_F_TSO;
859 if (arg & TUN_F_TSO6)
860 features |= NETIF_F_TSO6;
861 arg &= ~(TUN_F_TSO4|TUN_F_TSO6);
865 /* This gives the user a way to test for new features in future by
866 * trying to set them. */
870 dev->features = features;
871 if (old_features != dev->features)
872 netdev_features_change(dev);
877 static int tun_chr_ioctl(struct inode *inode, struct file *file,
878 unsigned int cmd, unsigned long arg)
880 struct tun_struct *tun = file->private_data;
881 void __user* argp = (void __user*)arg;
885 if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89)
886 if (copy_from_user(&ifr, argp, sizeof ifr))
889 if (cmd == TUNSETIFF && !tun) {
892 ifr.ifr_name[IFNAMSIZ-1] = '\0';
895 err = tun_set_iff(current->nsproxy->net_ns, file, &ifr);
901 if (copy_to_user(argp, &ifr, sizeof(ifr)))
906 if (cmd == TUNGETFEATURES) {
907 /* Currently this just means: "what IFF flags are valid?".
908 * This is needed because we never checked for invalid flags on
910 return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE |
912 (unsigned int __user*)argp);
918 DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd);
922 ret = tun_get_iff(current->nsproxy->net_ns, file, &ifr);
926 if (copy_to_user(argp, &ifr, sizeof(ifr)))
931 /* Disable/Enable checksum */
933 tun->flags |= TUN_NOCHECKSUM;
935 tun->flags &= ~TUN_NOCHECKSUM;
937 DBG(KERN_INFO "%s: checksum %s\n",
938 tun->dev->name, arg ? "disabled" : "enabled");
942 /* Disable/Enable persist mode */
944 tun->flags |= TUN_PERSIST;
946 tun->flags &= ~TUN_PERSIST;
948 DBG(KERN_INFO "%s: persist %s\n",
949 tun->dev->name, arg ? "enabled" : "disabled");
953 /* Set owner of the device */
954 tun->owner = (uid_t) arg;
956 DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner);
960 /* Set group of the device */
961 tun->group= (gid_t) arg;
963 DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group);
967 /* Only allow setting the type when the interface is down */
969 if (tun->dev->flags & IFF_UP) {
970 DBG(KERN_INFO "%s: Linktype set failed because interface is up\n",
974 tun->dev->type = (int) arg;
975 DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type);
988 ret = set_offload(tun->dev, arg);
993 /* Can be set only for TAPs */
994 if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV)
997 ret = update_filter(&tun->txflt, (void __user *)arg);
1003 memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN);
1004 ifr.ifr_hwaddr.sa_family = tun->dev->type;
1005 if (copy_to_user(argp, &ifr, sizeof ifr))
1010 /* Set hw address */
1011 DBG(KERN_DEBUG "%s: set hw address: %pM\n",
1012 tun->dev->name, ifr.ifr_hwaddr.sa_data);
1015 ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr);
1026 static int tun_chr_fasync(int fd, struct file *file, int on)
1028 struct tun_struct *tun = file->private_data;
1034 DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on);
1037 if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0)
1041 ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0);
1044 tun->flags |= TUN_FASYNC;
1046 tun->flags &= ~TUN_FASYNC;
1053 static int tun_chr_open(struct inode *inode, struct file * file)
1055 cycle_kernel_lock();
1056 DBG1(KERN_INFO "tunX: tun_chr_open\n");
1057 file->private_data = NULL;
1061 static int tun_chr_close(struct inode *inode, struct file *file)
1063 struct tun_struct *tun = file->private_data;
1068 DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name);
1072 /* Detach from net device */
1073 file->private_data = NULL;
1075 put_net(dev_net(tun->dev));
1077 /* Drop read queue */
1078 skb_queue_purge(&tun->readq);
1080 if (!(tun->flags & TUN_PERSIST))
1081 unregister_netdevice(tun->dev);
1088 static const struct file_operations tun_fops = {
1089 .owner = THIS_MODULE,
1090 .llseek = no_llseek,
1091 .read = do_sync_read,
1092 .aio_read = tun_chr_aio_read,
1093 .write = do_sync_write,
1094 .aio_write = tun_chr_aio_write,
1095 .poll = tun_chr_poll,
1096 .ioctl = tun_chr_ioctl,
1097 .open = tun_chr_open,
1098 .release = tun_chr_close,
1099 .fasync = tun_chr_fasync
1102 static struct miscdevice tun_miscdev = {
1108 /* ethtool interface */
1110 static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1113 cmd->advertising = 0;
1114 cmd->speed = SPEED_10;
1115 cmd->duplex = DUPLEX_FULL;
1116 cmd->port = PORT_TP;
1117 cmd->phy_address = 0;
1118 cmd->transceiver = XCVR_INTERNAL;
1119 cmd->autoneg = AUTONEG_DISABLE;
1125 static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1127 struct tun_struct *tun = netdev_priv(dev);
1129 strcpy(info->driver, DRV_NAME);
1130 strcpy(info->version, DRV_VERSION);
1131 strcpy(info->fw_version, "N/A");
1133 switch (tun->flags & TUN_TYPE_MASK) {
1135 strcpy(info->bus_info, "tun");
1138 strcpy(info->bus_info, "tap");
1143 static u32 tun_get_msglevel(struct net_device *dev)
1146 struct tun_struct *tun = netdev_priv(dev);
1153 static void tun_set_msglevel(struct net_device *dev, u32 value)
1156 struct tun_struct *tun = netdev_priv(dev);
1161 static u32 tun_get_link(struct net_device *dev)
1163 struct tun_struct *tun = netdev_priv(dev);
1164 return tun->attached;
1167 static u32 tun_get_rx_csum(struct net_device *dev)
1169 struct tun_struct *tun = netdev_priv(dev);
1170 return (tun->flags & TUN_NOCHECKSUM) == 0;
1173 static int tun_set_rx_csum(struct net_device *dev, u32 data)
1175 struct tun_struct *tun = netdev_priv(dev);
1177 tun->flags &= ~TUN_NOCHECKSUM;
1179 tun->flags |= TUN_NOCHECKSUM;
1183 static const struct ethtool_ops tun_ethtool_ops = {
1184 .get_settings = tun_get_settings,
1185 .get_drvinfo = tun_get_drvinfo,
1186 .get_msglevel = tun_get_msglevel,
1187 .set_msglevel = tun_set_msglevel,
1188 .get_link = tun_get_link,
1189 .get_rx_csum = tun_get_rx_csum,
1190 .set_rx_csum = tun_set_rx_csum
1193 static int tun_init_net(struct net *net)
1198 static void tun_exit_net(struct net *net)
1200 struct net_device *dev, *next;
1203 for_each_netdev_safe(net, dev, next) {
1204 if (dev->ethtool_ops != &tun_ethtool_ops)
1206 DBG(KERN_INFO "%s cleaned up\n", dev->name);
1207 unregister_netdevice(dev);
1212 static struct pernet_operations tun_net_ops = {
1213 .init = tun_init_net,
1214 .exit = tun_exit_net,
1217 static int __init tun_init(void)
1221 printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION);
1222 printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT);
1224 ret = register_pernet_device(&tun_net_ops);
1226 printk(KERN_ERR "tun: Can't register pernet ops\n");
1230 ret = misc_register(&tun_miscdev);
1232 printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR);
1238 unregister_pernet_device(&tun_net_ops);
1243 static void tun_cleanup(void)
1245 misc_deregister(&tun_miscdev);
1246 unregister_pernet_device(&tun_net_ops);
1249 module_init(tun_init);
1250 module_exit(tun_cleanup);
1251 MODULE_DESCRIPTION(DRV_DESCRIPTION);
1252 MODULE_AUTHOR(DRV_COPYRIGHT);
1253 MODULE_LICENSE("GPL");
1254 MODULE_ALIAS_MISCDEV(TUN_MINOR);