![Dave Jones](/assets/img/avatar_default.png)
We're leaking an skb in a failure path in this function. Coverity #632 Signed-off-by: Dave Jones <davej@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
902 lines
21 KiB
C
902 lines
21 KiB
C
/*
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* TUN - Universal TUN/TAP device driver.
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* Copyright (C) 1999-2002 Maxim Krasnyansky <maxk@qualcomm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* $Id: tun.c,v 1.15 2002/03/01 02:44:24 maxk Exp $
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*/
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/*
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* Changes:
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*
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* Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14
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* Add TUNSETLINK ioctl to set the link encapsulation
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*
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* Mark Smith <markzzzsmith@yahoo.com.au>
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* Use random_ether_addr() for tap MAC address.
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*
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* Harald Roelle <harald.roelle@ifi.lmu.de> 2004/04/20
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* Fixes in packet dropping, queue length setting and queue wakeup.
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* Increased default tx queue length.
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* Added ethtool API.
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* Minor cleanups
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*
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* Daniel Podlejski <underley@underley.eu.org>
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* Modifications for 2.3.99-pre5 kernel.
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*/
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#define DRV_NAME "tun"
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#define DRV_VERSION "1.6"
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#define DRV_DESCRIPTION "Universal TUN/TAP device driver"
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#define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>"
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/major.h>
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#include <linux/slab.h>
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#include <linux/poll.h>
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#include <linux/fcntl.h>
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#include <linux/init.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/miscdevice.h>
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#include <linux/ethtool.h>
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#include <linux/rtnetlink.h>
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#include <linux/if.h>
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#include <linux/if_arp.h>
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#include <linux/if_ether.h>
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#include <linux/if_tun.h>
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#include <linux/crc32.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#ifdef TUN_DEBUG
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static int debug;
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#endif
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/* Network device part of the driver */
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static LIST_HEAD(tun_dev_list);
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static struct ethtool_ops tun_ethtool_ops;
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/* Net device open. */
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static int tun_net_open(struct net_device *dev)
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{
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netif_start_queue(dev);
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return 0;
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}
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/* Net device close. */
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static int tun_net_close(struct net_device *dev)
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{
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netif_stop_queue(dev);
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return 0;
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}
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/* Net device start xmit */
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static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct tun_struct *tun = netdev_priv(dev);
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DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len);
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/* Drop packet if interface is not attached */
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if (!tun->attached)
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goto drop;
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/* Packet dropping */
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if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) {
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if (!(tun->flags & TUN_ONE_QUEUE)) {
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/* Normal queueing mode. */
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/* Packet scheduler handles dropping of further packets. */
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netif_stop_queue(dev);
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/* We won't see all dropped packets individually, so overrun
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* error is more appropriate. */
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tun->stats.tx_fifo_errors++;
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} else {
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/* Single queue mode.
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* Driver handles dropping of all packets itself. */
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goto drop;
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}
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}
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/* Queue packet */
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skb_queue_tail(&tun->readq, skb);
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dev->trans_start = jiffies;
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/* Notify and wake up reader process */
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if (tun->flags & TUN_FASYNC)
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kill_fasync(&tun->fasync, SIGIO, POLL_IN);
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wake_up_interruptible(&tun->read_wait);
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return 0;
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drop:
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tun->stats.tx_dropped++;
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kfree_skb(skb);
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return 0;
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}
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/** Add the specified Ethernet address to this multicast filter. */
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static void
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add_multi(u32* filter, const u8* addr)
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{
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int bit_nr = ether_crc(ETH_ALEN, addr) >> 26;
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filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
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}
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/** Remove the specified Ethernet addres from this multicast filter. */
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static void
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del_multi(u32* filter, const u8* addr)
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{
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int bit_nr = ether_crc(ETH_ALEN, addr) >> 26;
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filter[bit_nr >> 5] &= ~(1 << (bit_nr & 31));
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}
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/** Update the list of multicast groups to which the network device belongs.
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* This list is used to filter packets being sent from the character device to
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* the network device. */
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static void
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tun_net_mclist(struct net_device *dev)
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{
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struct tun_struct *tun = netdev_priv(dev);
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const struct dev_mc_list *mclist;
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int i;
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DBG(KERN_DEBUG "%s: tun_net_mclist: mc_count %d\n",
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dev->name, dev->mc_count);
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memset(tun->chr_filter, 0, sizeof tun->chr_filter);
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for (i = 0, mclist = dev->mc_list; i < dev->mc_count && mclist != NULL;
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i++, mclist = mclist->next) {
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add_multi(tun->net_filter, mclist->dmi_addr);
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DBG(KERN_DEBUG "%s: tun_net_mclist: %x:%x:%x:%x:%x:%x\n",
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dev->name,
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mclist->dmi_addr[0], mclist->dmi_addr[1], mclist->dmi_addr[2],
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mclist->dmi_addr[3], mclist->dmi_addr[4], mclist->dmi_addr[5]);
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}
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}
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static struct net_device_stats *tun_net_stats(struct net_device *dev)
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{
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struct tun_struct *tun = netdev_priv(dev);
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return &tun->stats;
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}
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/* Initialize net device. */
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static void tun_net_init(struct net_device *dev)
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{
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struct tun_struct *tun = netdev_priv(dev);
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switch (tun->flags & TUN_TYPE_MASK) {
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case TUN_TUN_DEV:
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/* Point-to-Point TUN Device */
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dev->hard_header_len = 0;
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dev->addr_len = 0;
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dev->mtu = 1500;
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/* Zero header length */
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dev->type = ARPHRD_NONE;
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dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
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dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
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break;
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case TUN_TAP_DEV:
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/* Ethernet TAP Device */
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dev->set_multicast_list = tun_net_mclist;
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ether_setup(dev);
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random_ether_addr(dev->dev_addr);
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dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
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break;
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}
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}
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/* Character device part */
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/* Poll */
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static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
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{
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struct tun_struct *tun = file->private_data;
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unsigned int mask = POLLOUT | POLLWRNORM;
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if (!tun)
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return -EBADFD;
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DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name);
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poll_wait(file, &tun->read_wait, wait);
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if (!skb_queue_empty(&tun->readq))
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mask |= POLLIN | POLLRDNORM;
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return mask;
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}
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/* Get packet from user space buffer */
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static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count)
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{
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struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) };
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struct sk_buff *skb;
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size_t len = count, align = 0;
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if (!(tun->flags & TUN_NO_PI)) {
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if ((len -= sizeof(pi)) > count)
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return -EINVAL;
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if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi)))
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return -EFAULT;
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}
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if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV)
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align = NET_IP_ALIGN;
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if (!(skb = alloc_skb(len + align, GFP_KERNEL))) {
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tun->stats.rx_dropped++;
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return -ENOMEM;
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}
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if (align)
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skb_reserve(skb, align);
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if (memcpy_fromiovec(skb_put(skb, len), iv, len)) {
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tun->stats.rx_dropped++;
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kfree_skb(skb);
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return -EFAULT;
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}
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skb->dev = tun->dev;
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switch (tun->flags & TUN_TYPE_MASK) {
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case TUN_TUN_DEV:
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skb->mac.raw = skb->data;
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skb->protocol = pi.proto;
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break;
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case TUN_TAP_DEV:
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skb->protocol = eth_type_trans(skb, tun->dev);
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break;
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};
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if (tun->flags & TUN_NOCHECKSUM)
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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netif_rx_ni(skb);
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tun->dev->last_rx = jiffies;
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tun->stats.rx_packets++;
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tun->stats.rx_bytes += len;
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return count;
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}
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static inline size_t iov_total(const struct iovec *iv, unsigned long count)
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{
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unsigned long i;
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size_t len;
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for (i = 0, len = 0; i < count; i++)
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len += iv[i].iov_len;
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return len;
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}
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/* Writev */
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static ssize_t tun_chr_writev(struct file * file, const struct iovec *iv,
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unsigned long count, loff_t *pos)
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{
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struct tun_struct *tun = file->private_data;
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if (!tun)
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return -EBADFD;
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DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count);
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return tun_get_user(tun, (struct iovec *) iv, iov_total(iv, count));
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}
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/* Write */
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static ssize_t tun_chr_write(struct file * file, const char __user * buf,
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size_t count, loff_t *pos)
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{
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struct iovec iv = { (void __user *) buf, count };
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return tun_chr_writev(file, &iv, 1, pos);
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}
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/* Put packet to the user space buffer */
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static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
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struct sk_buff *skb,
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struct iovec *iv, int len)
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{
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struct tun_pi pi = { 0, skb->protocol };
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ssize_t total = 0;
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if (!(tun->flags & TUN_NO_PI)) {
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if ((len -= sizeof(pi)) < 0)
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return -EINVAL;
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if (len < skb->len) {
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/* Packet will be striped */
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pi.flags |= TUN_PKT_STRIP;
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}
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if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi)))
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return -EFAULT;
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total += sizeof(pi);
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}
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len = min_t(int, skb->len, len);
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skb_copy_datagram_iovec(skb, 0, iv, len);
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total += len;
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tun->stats.tx_packets++;
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tun->stats.tx_bytes += len;
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return total;
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}
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/* Readv */
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static ssize_t tun_chr_readv(struct file *file, const struct iovec *iv,
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unsigned long count, loff_t *pos)
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{
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struct tun_struct *tun = file->private_data;
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DECLARE_WAITQUEUE(wait, current);
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struct sk_buff *skb;
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ssize_t len, ret = 0;
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if (!tun)
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return -EBADFD;
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DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name);
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len = iov_total(iv, count);
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if (len < 0)
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return -EINVAL;
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add_wait_queue(&tun->read_wait, &wait);
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while (len) {
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const u8 ones[ ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
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u8 addr[ ETH_ALEN];
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int bit_nr;
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current->state = TASK_INTERRUPTIBLE;
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/* Read frames from the queue */
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if (!(skb=skb_dequeue(&tun->readq))) {
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if (file->f_flags & O_NONBLOCK) {
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ret = -EAGAIN;
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break;
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}
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if (signal_pending(current)) {
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ret = -ERESTARTSYS;
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break;
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}
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/* Nothing to read, let's sleep */
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schedule();
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continue;
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}
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netif_wake_queue(tun->dev);
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/** Decide whether to accept this packet. This code is designed to
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* behave identically to an Ethernet interface. Accept the packet if
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* - we are promiscuous.
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* - the packet is addressed to us.
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* - the packet is broadcast.
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* - the packet is multicast and
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* - we are multicast promiscous.
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* - we belong to the multicast group.
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*/
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memcpy(addr, skb->data,
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min_t(size_t, sizeof addr, skb->len));
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bit_nr = ether_crc(sizeof addr, addr) >> 26;
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if ((tun->if_flags & IFF_PROMISC) ||
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memcmp(addr, tun->dev_addr, sizeof addr) == 0 ||
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memcmp(addr, ones, sizeof addr) == 0 ||
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(((addr[0] == 1 && addr[1] == 0 && addr[2] == 0x5e) ||
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(addr[0] == 0x33 && addr[1] == 0x33)) &&
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((tun->if_flags & IFF_ALLMULTI) ||
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(tun->chr_filter[bit_nr >> 5] & (1 << (bit_nr & 31)))))) {
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DBG(KERN_DEBUG "%s: tun_chr_readv: accepted: %x:%x:%x:%x:%x:%x\n",
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tun->dev->name, addr[0], addr[1], addr[2],
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addr[3], addr[4], addr[5]);
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ret = tun_put_user(tun, skb, (struct iovec *) iv, len);
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kfree_skb(skb);
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break;
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} else {
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DBG(KERN_DEBUG "%s: tun_chr_readv: rejected: %x:%x:%x:%x:%x:%x\n",
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tun->dev->name, addr[0], addr[1], addr[2],
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addr[3], addr[4], addr[5]);
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kfree_skb(skb);
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continue;
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}
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}
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current->state = TASK_RUNNING;
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remove_wait_queue(&tun->read_wait, &wait);
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return ret;
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}
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/* Read */
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static ssize_t tun_chr_read(struct file * file, char __user * buf,
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size_t count, loff_t *pos)
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{
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struct iovec iv = { buf, count };
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return tun_chr_readv(file, &iv, 1, pos);
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}
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static void tun_setup(struct net_device *dev)
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{
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struct tun_struct *tun = netdev_priv(dev);
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skb_queue_head_init(&tun->readq);
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init_waitqueue_head(&tun->read_wait);
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tun->owner = -1;
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SET_MODULE_OWNER(dev);
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dev->open = tun_net_open;
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dev->hard_start_xmit = tun_net_xmit;
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dev->stop = tun_net_close;
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dev->get_stats = tun_net_stats;
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dev->ethtool_ops = &tun_ethtool_ops;
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dev->destructor = free_netdev;
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}
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static struct tun_struct *tun_get_by_name(const char *name)
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{
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struct tun_struct *tun;
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ASSERT_RTNL();
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list_for_each_entry(tun, &tun_dev_list, list) {
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if (!strncmp(tun->dev->name, name, IFNAMSIZ))
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return tun;
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}
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return NULL;
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}
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static int tun_set_iff(struct file *file, struct ifreq *ifr)
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{
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struct tun_struct *tun;
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struct net_device *dev;
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int err;
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tun = tun_get_by_name(ifr->ifr_name);
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if (tun) {
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if (tun->attached)
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return -EBUSY;
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/* Check permissions */
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if (tun->owner != -1 &&
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current->euid != tun->owner && !capable(CAP_NET_ADMIN))
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return -EPERM;
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}
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else if (__dev_get_by_name(ifr->ifr_name))
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return -EINVAL;
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else {
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char *name;
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unsigned long flags = 0;
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err = -EINVAL;
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/* Set dev type */
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if (ifr->ifr_flags & IFF_TUN) {
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/* TUN device */
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flags |= TUN_TUN_DEV;
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name = "tun%d";
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} else if (ifr->ifr_flags & IFF_TAP) {
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/* TAP device */
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flags |= TUN_TAP_DEV;
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name = "tap%d";
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} else
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goto failed;
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if (*ifr->ifr_name)
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name = ifr->ifr_name;
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dev = alloc_netdev(sizeof(struct tun_struct), name,
|
|
tun_setup);
|
|
if (!dev)
|
|
return -ENOMEM;
|
|
|
|
tun = netdev_priv(dev);
|
|
tun->dev = dev;
|
|
tun->flags = flags;
|
|
/* Be promiscuous by default to maintain previous behaviour. */
|
|
tun->if_flags = IFF_PROMISC;
|
|
/* Generate random Ethernet address. */
|
|
*(u16 *)tun->dev_addr = htons(0x00FF);
|
|
get_random_bytes(tun->dev_addr + sizeof(u16), 4);
|
|
memset(tun->chr_filter, 0, sizeof tun->chr_filter);
|
|
|
|
tun_net_init(dev);
|
|
|
|
if (strchr(dev->name, '%')) {
|
|
err = dev_alloc_name(dev, dev->name);
|
|
if (err < 0)
|
|
goto err_free_dev;
|
|
}
|
|
|
|
err = register_netdevice(tun->dev);
|
|
if (err < 0)
|
|
goto err_free_dev;
|
|
|
|
list_add(&tun->list, &tun_dev_list);
|
|
}
|
|
|
|
DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name);
|
|
|
|
if (ifr->ifr_flags & IFF_NO_PI)
|
|
tun->flags |= TUN_NO_PI;
|
|
|
|
if (ifr->ifr_flags & IFF_ONE_QUEUE)
|
|
tun->flags |= TUN_ONE_QUEUE;
|
|
|
|
file->private_data = tun;
|
|
tun->attached = 1;
|
|
|
|
strcpy(ifr->ifr_name, tun->dev->name);
|
|
return 0;
|
|
|
|
err_free_dev:
|
|
free_netdev(dev);
|
|
failed:
|
|
return err;
|
|
}
|
|
|
|
static int tun_chr_ioctl(struct inode *inode, struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct tun_struct *tun = file->private_data;
|
|
void __user* argp = (void __user*)arg;
|
|
struct ifreq ifr;
|
|
|
|
if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89)
|
|
if (copy_from_user(&ifr, argp, sizeof ifr))
|
|
return -EFAULT;
|
|
|
|
if (cmd == TUNSETIFF && !tun) {
|
|
int err;
|
|
|
|
ifr.ifr_name[IFNAMSIZ-1] = '\0';
|
|
|
|
rtnl_lock();
|
|
err = tun_set_iff(file, &ifr);
|
|
rtnl_unlock();
|
|
|
|
if (err)
|
|
return err;
|
|
|
|
if (copy_to_user(argp, &ifr, sizeof(ifr)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
if (!tun)
|
|
return -EBADFD;
|
|
|
|
DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd);
|
|
|
|
switch (cmd) {
|
|
case TUNSETNOCSUM:
|
|
/* Disable/Enable checksum */
|
|
if (arg)
|
|
tun->flags |= TUN_NOCHECKSUM;
|
|
else
|
|
tun->flags &= ~TUN_NOCHECKSUM;
|
|
|
|
DBG(KERN_INFO "%s: checksum %s\n",
|
|
tun->dev->name, arg ? "disabled" : "enabled");
|
|
break;
|
|
|
|
case TUNSETPERSIST:
|
|
/* Disable/Enable persist mode */
|
|
if (arg)
|
|
tun->flags |= TUN_PERSIST;
|
|
else
|
|
tun->flags &= ~TUN_PERSIST;
|
|
|
|
DBG(KERN_INFO "%s: persist %s\n",
|
|
tun->dev->name, arg ? "disabled" : "enabled");
|
|
break;
|
|
|
|
case TUNSETOWNER:
|
|
/* Set owner of the device */
|
|
tun->owner = (uid_t) arg;
|
|
|
|
DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner);
|
|
break;
|
|
|
|
case TUNSETLINK:
|
|
/* Only allow setting the type when the interface is down */
|
|
if (tun->dev->flags & IFF_UP) {
|
|
DBG(KERN_INFO "%s: Linktype set failed because interface is up\n",
|
|
tun->dev->name);
|
|
return -EBUSY;
|
|
} else {
|
|
tun->dev->type = (int) arg;
|
|
DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type);
|
|
}
|
|
break;
|
|
|
|
#ifdef TUN_DEBUG
|
|
case TUNSETDEBUG:
|
|
tun->debug = arg;
|
|
break;
|
|
#endif
|
|
|
|
case SIOCGIFFLAGS:
|
|
ifr.ifr_flags = tun->if_flags;
|
|
if (copy_to_user( argp, &ifr, sizeof ifr))
|
|
return -EFAULT;
|
|
return 0;
|
|
|
|
case SIOCSIFFLAGS:
|
|
/** Set the character device's interface flags. Currently only
|
|
* IFF_PROMISC and IFF_ALLMULTI are used. */
|
|
tun->if_flags = ifr.ifr_flags;
|
|
DBG(KERN_INFO "%s: interface flags 0x%lx\n",
|
|
tun->dev->name, tun->if_flags);
|
|
return 0;
|
|
|
|
case SIOCGIFHWADDR:
|
|
memcpy(ifr.ifr_hwaddr.sa_data, tun->dev_addr,
|
|
min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
|
|
if (copy_to_user( argp, &ifr, sizeof ifr))
|
|
return -EFAULT;
|
|
return 0;
|
|
|
|
case SIOCSIFHWADDR:
|
|
/** Set the character device's hardware address. This is used when
|
|
* filtering packets being sent from the network device to the character
|
|
* device. */
|
|
memcpy(tun->dev_addr, ifr.ifr_hwaddr.sa_data,
|
|
min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
|
|
DBG(KERN_DEBUG "%s: set hardware address: %x:%x:%x:%x:%x:%x\n",
|
|
tun->dev->name,
|
|
tun->dev_addr[0], tun->dev_addr[1], tun->dev_addr[2],
|
|
tun->dev_addr[3], tun->dev_addr[4], tun->dev_addr[5]);
|
|
return 0;
|
|
|
|
case SIOCADDMULTI:
|
|
/** Add the specified group to the character device's multicast filter
|
|
* list. */
|
|
add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
|
|
DBG(KERN_DEBUG "%s: add multi: %x:%x:%x:%x:%x:%x\n",
|
|
tun->dev->name,
|
|
(u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1],
|
|
(u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3],
|
|
(u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]);
|
|
return 0;
|
|
|
|
case SIOCDELMULTI:
|
|
/** Remove the specified group from the character device's multicast
|
|
* filter list. */
|
|
del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
|
|
DBG(KERN_DEBUG "%s: del multi: %x:%x:%x:%x:%x:%x\n",
|
|
tun->dev->name,
|
|
(u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1],
|
|
(u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3],
|
|
(u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]);
|
|
return 0;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
};
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tun_chr_fasync(int fd, struct file *file, int on)
|
|
{
|
|
struct tun_struct *tun = file->private_data;
|
|
int ret;
|
|
|
|
if (!tun)
|
|
return -EBADFD;
|
|
|
|
DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on);
|
|
|
|
if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0)
|
|
return ret;
|
|
|
|
if (on) {
|
|
ret = f_setown(file, current->pid, 0);
|
|
if (ret)
|
|
return ret;
|
|
tun->flags |= TUN_FASYNC;
|
|
} else
|
|
tun->flags &= ~TUN_FASYNC;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tun_chr_open(struct inode *inode, struct file * file)
|
|
{
|
|
DBG1(KERN_INFO "tunX: tun_chr_open\n");
|
|
file->private_data = NULL;
|
|
return 0;
|
|
}
|
|
|
|
static int tun_chr_close(struct inode *inode, struct file *file)
|
|
{
|
|
struct tun_struct *tun = file->private_data;
|
|
|
|
if (!tun)
|
|
return 0;
|
|
|
|
DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name);
|
|
|
|
tun_chr_fasync(-1, file, 0);
|
|
|
|
rtnl_lock();
|
|
|
|
/* Detach from net device */
|
|
file->private_data = NULL;
|
|
tun->attached = 0;
|
|
|
|
/* Drop read queue */
|
|
skb_queue_purge(&tun->readq);
|
|
|
|
if (!(tun->flags & TUN_PERSIST)) {
|
|
list_del(&tun->list);
|
|
unregister_netdevice(tun->dev);
|
|
}
|
|
|
|
rtnl_unlock();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct file_operations tun_fops = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = no_llseek,
|
|
.read = tun_chr_read,
|
|
.readv = tun_chr_readv,
|
|
.write = tun_chr_write,
|
|
.writev = tun_chr_writev,
|
|
.poll = tun_chr_poll,
|
|
.ioctl = tun_chr_ioctl,
|
|
.open = tun_chr_open,
|
|
.release = tun_chr_close,
|
|
.fasync = tun_chr_fasync
|
|
};
|
|
|
|
static struct miscdevice tun_miscdev = {
|
|
.minor = TUN_MINOR,
|
|
.name = "tun",
|
|
.fops = &tun_fops,
|
|
.devfs_name = "net/tun",
|
|
};
|
|
|
|
/* ethtool interface */
|
|
|
|
static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
|
|
{
|
|
cmd->supported = 0;
|
|
cmd->advertising = 0;
|
|
cmd->speed = SPEED_10;
|
|
cmd->duplex = DUPLEX_FULL;
|
|
cmd->port = PORT_TP;
|
|
cmd->phy_address = 0;
|
|
cmd->transceiver = XCVR_INTERNAL;
|
|
cmd->autoneg = AUTONEG_DISABLE;
|
|
cmd->maxtxpkt = 0;
|
|
cmd->maxrxpkt = 0;
|
|
return 0;
|
|
}
|
|
|
|
static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
|
|
{
|
|
struct tun_struct *tun = netdev_priv(dev);
|
|
|
|
strcpy(info->driver, DRV_NAME);
|
|
strcpy(info->version, DRV_VERSION);
|
|
strcpy(info->fw_version, "N/A");
|
|
|
|
switch (tun->flags & TUN_TYPE_MASK) {
|
|
case TUN_TUN_DEV:
|
|
strcpy(info->bus_info, "tun");
|
|
break;
|
|
case TUN_TAP_DEV:
|
|
strcpy(info->bus_info, "tap");
|
|
break;
|
|
}
|
|
}
|
|
|
|
static u32 tun_get_msglevel(struct net_device *dev)
|
|
{
|
|
#ifdef TUN_DEBUG
|
|
struct tun_struct *tun = netdev_priv(dev);
|
|
return tun->debug;
|
|
#else
|
|
return -EOPNOTSUPP;
|
|
#endif
|
|
}
|
|
|
|
static void tun_set_msglevel(struct net_device *dev, u32 value)
|
|
{
|
|
#ifdef TUN_DEBUG
|
|
struct tun_struct *tun = netdev_priv(dev);
|
|
tun->debug = value;
|
|
#endif
|
|
}
|
|
|
|
static u32 tun_get_link(struct net_device *dev)
|
|
{
|
|
struct tun_struct *tun = netdev_priv(dev);
|
|
return tun->attached;
|
|
}
|
|
|
|
static u32 tun_get_rx_csum(struct net_device *dev)
|
|
{
|
|
struct tun_struct *tun = netdev_priv(dev);
|
|
return (tun->flags & TUN_NOCHECKSUM) == 0;
|
|
}
|
|
|
|
static int tun_set_rx_csum(struct net_device *dev, u32 data)
|
|
{
|
|
struct tun_struct *tun = netdev_priv(dev);
|
|
if (data)
|
|
tun->flags &= ~TUN_NOCHECKSUM;
|
|
else
|
|
tun->flags |= TUN_NOCHECKSUM;
|
|
return 0;
|
|
}
|
|
|
|
static struct ethtool_ops tun_ethtool_ops = {
|
|
.get_settings = tun_get_settings,
|
|
.get_drvinfo = tun_get_drvinfo,
|
|
.get_msglevel = tun_get_msglevel,
|
|
.set_msglevel = tun_set_msglevel,
|
|
.get_link = tun_get_link,
|
|
.get_rx_csum = tun_get_rx_csum,
|
|
.set_rx_csum = tun_set_rx_csum
|
|
};
|
|
|
|
static int __init tun_init(void)
|
|
{
|
|
int ret = 0;
|
|
|
|
printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION);
|
|
printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT);
|
|
|
|
ret = misc_register(&tun_miscdev);
|
|
if (ret)
|
|
printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR);
|
|
return ret;
|
|
}
|
|
|
|
static void tun_cleanup(void)
|
|
{
|
|
struct tun_struct *tun, *nxt;
|
|
|
|
misc_deregister(&tun_miscdev);
|
|
|
|
rtnl_lock();
|
|
list_for_each_entry_safe(tun, nxt, &tun_dev_list, list) {
|
|
DBG(KERN_INFO "%s cleaned up\n", tun->dev->name);
|
|
unregister_netdevice(tun->dev);
|
|
}
|
|
rtnl_unlock();
|
|
|
|
}
|
|
|
|
module_init(tun_init);
|
|
module_exit(tun_cleanup);
|
|
MODULE_DESCRIPTION(DRV_DESCRIPTION);
|
|
MODULE_AUTHOR(DRV_COPYRIGHT);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_MISCDEV(TUN_MINOR);
|