mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 10:32:35 +00:00
afc4b13df1
replace it by ndo_set_rx_mode Signed-off-by: Jiri Pirko <jpirko@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1688 lines
38 KiB
C
1688 lines
38 KiB
C
/*
|
|
* TUN - Universal TUN/TAP device driver.
|
|
* Copyright (C) 1999-2002 Maxim Krasnyansky <maxk@qualcomm.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* $Id: tun.c,v 1.15 2002/03/01 02:44:24 maxk Exp $
|
|
*/
|
|
|
|
/*
|
|
* Changes:
|
|
*
|
|
* Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14
|
|
* Add TUNSETLINK ioctl to set the link encapsulation
|
|
*
|
|
* Mark Smith <markzzzsmith@yahoo.com.au>
|
|
* Use random_ether_addr() for tap MAC address.
|
|
*
|
|
* Harald Roelle <harald.roelle@ifi.lmu.de> 2004/04/20
|
|
* Fixes in packet dropping, queue length setting and queue wakeup.
|
|
* Increased default tx queue length.
|
|
* Added ethtool API.
|
|
* Minor cleanups
|
|
*
|
|
* Daniel Podlejski <underley@underley.eu.org>
|
|
* Modifications for 2.3.99-pre5 kernel.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#define DRV_NAME "tun"
|
|
#define DRV_VERSION "1.6"
|
|
#define DRV_DESCRIPTION "Universal TUN/TAP device driver"
|
|
#define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>"
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/major.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/poll.h>
|
|
#include <linux/fcntl.h>
|
|
#include <linux/init.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/etherdevice.h>
|
|
#include <linux/miscdevice.h>
|
|
#include <linux/ethtool.h>
|
|
#include <linux/rtnetlink.h>
|
|
#include <linux/compat.h>
|
|
#include <linux/if.h>
|
|
#include <linux/if_arp.h>
|
|
#include <linux/if_ether.h>
|
|
#include <linux/if_tun.h>
|
|
#include <linux/crc32.h>
|
|
#include <linux/nsproxy.h>
|
|
#include <linux/virtio_net.h>
|
|
#include <linux/rcupdate.h>
|
|
#include <net/net_namespace.h>
|
|
#include <net/netns/generic.h>
|
|
#include <net/rtnetlink.h>
|
|
#include <net/sock.h>
|
|
|
|
#include <asm/system.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
/* Uncomment to enable debugging */
|
|
/* #define TUN_DEBUG 1 */
|
|
|
|
#ifdef TUN_DEBUG
|
|
static int debug;
|
|
|
|
#define tun_debug(level, tun, fmt, args...) \
|
|
do { \
|
|
if (tun->debug) \
|
|
netdev_printk(level, tun->dev, fmt, ##args); \
|
|
} while (0)
|
|
#define DBG1(level, fmt, args...) \
|
|
do { \
|
|
if (debug == 2) \
|
|
printk(level fmt, ##args); \
|
|
} while (0)
|
|
#else
|
|
#define tun_debug(level, tun, fmt, args...) \
|
|
do { \
|
|
if (0) \
|
|
netdev_printk(level, tun->dev, fmt, ##args); \
|
|
} while (0)
|
|
#define DBG1(level, fmt, args...) \
|
|
do { \
|
|
if (0) \
|
|
printk(level fmt, ##args); \
|
|
} while (0)
|
|
#endif
|
|
|
|
#define FLT_EXACT_COUNT 8
|
|
struct tap_filter {
|
|
unsigned int count; /* Number of addrs. Zero means disabled */
|
|
u32 mask[2]; /* Mask of the hashed addrs */
|
|
unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN];
|
|
};
|
|
|
|
struct tun_file {
|
|
atomic_t count;
|
|
struct tun_struct *tun;
|
|
struct net *net;
|
|
};
|
|
|
|
struct tun_sock;
|
|
|
|
struct tun_struct {
|
|
struct tun_file *tfile;
|
|
unsigned int flags;
|
|
uid_t owner;
|
|
gid_t group;
|
|
|
|
struct net_device *dev;
|
|
u32 set_features;
|
|
#define TUN_USER_FEATURES (NETIF_F_HW_CSUM|NETIF_F_TSO_ECN|NETIF_F_TSO| \
|
|
NETIF_F_TSO6|NETIF_F_UFO)
|
|
struct fasync_struct *fasync;
|
|
|
|
struct tap_filter txflt;
|
|
struct socket socket;
|
|
struct socket_wq wq;
|
|
|
|
int vnet_hdr_sz;
|
|
|
|
#ifdef TUN_DEBUG
|
|
int debug;
|
|
#endif
|
|
};
|
|
|
|
struct tun_sock {
|
|
struct sock sk;
|
|
struct tun_struct *tun;
|
|
};
|
|
|
|
static inline struct tun_sock *tun_sk(struct sock *sk)
|
|
{
|
|
return container_of(sk, struct tun_sock, sk);
|
|
}
|
|
|
|
static int tun_attach(struct tun_struct *tun, struct file *file)
|
|
{
|
|
struct tun_file *tfile = file->private_data;
|
|
int err;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
netif_tx_lock_bh(tun->dev);
|
|
|
|
err = -EINVAL;
|
|
if (tfile->tun)
|
|
goto out;
|
|
|
|
err = -EBUSY;
|
|
if (tun->tfile)
|
|
goto out;
|
|
|
|
err = 0;
|
|
tfile->tun = tun;
|
|
tun->tfile = tfile;
|
|
tun->socket.file = file;
|
|
netif_carrier_on(tun->dev);
|
|
dev_hold(tun->dev);
|
|
sock_hold(tun->socket.sk);
|
|
atomic_inc(&tfile->count);
|
|
|
|
out:
|
|
netif_tx_unlock_bh(tun->dev);
|
|
return err;
|
|
}
|
|
|
|
static void __tun_detach(struct tun_struct *tun)
|
|
{
|
|
/* Detach from net device */
|
|
netif_tx_lock_bh(tun->dev);
|
|
netif_carrier_off(tun->dev);
|
|
tun->tfile = NULL;
|
|
tun->socket.file = NULL;
|
|
netif_tx_unlock_bh(tun->dev);
|
|
|
|
/* Drop read queue */
|
|
skb_queue_purge(&tun->socket.sk->sk_receive_queue);
|
|
|
|
/* Drop the extra count on the net device */
|
|
dev_put(tun->dev);
|
|
}
|
|
|
|
static void tun_detach(struct tun_struct *tun)
|
|
{
|
|
rtnl_lock();
|
|
__tun_detach(tun);
|
|
rtnl_unlock();
|
|
}
|
|
|
|
static struct tun_struct *__tun_get(struct tun_file *tfile)
|
|
{
|
|
struct tun_struct *tun = NULL;
|
|
|
|
if (atomic_inc_not_zero(&tfile->count))
|
|
tun = tfile->tun;
|
|
|
|
return tun;
|
|
}
|
|
|
|
static struct tun_struct *tun_get(struct file *file)
|
|
{
|
|
return __tun_get(file->private_data);
|
|
}
|
|
|
|
static void tun_put(struct tun_struct *tun)
|
|
{
|
|
struct tun_file *tfile = tun->tfile;
|
|
|
|
if (atomic_dec_and_test(&tfile->count))
|
|
tun_detach(tfile->tun);
|
|
}
|
|
|
|
/* TAP filtering */
|
|
static void addr_hash_set(u32 *mask, const u8 *addr)
|
|
{
|
|
int n = ether_crc(ETH_ALEN, addr) >> 26;
|
|
mask[n >> 5] |= (1 << (n & 31));
|
|
}
|
|
|
|
static unsigned int addr_hash_test(const u32 *mask, const u8 *addr)
|
|
{
|
|
int n = ether_crc(ETH_ALEN, addr) >> 26;
|
|
return mask[n >> 5] & (1 << (n & 31));
|
|
}
|
|
|
|
static int update_filter(struct tap_filter *filter, void __user *arg)
|
|
{
|
|
struct { u8 u[ETH_ALEN]; } *addr;
|
|
struct tun_filter uf;
|
|
int err, alen, n, nexact;
|
|
|
|
if (copy_from_user(&uf, arg, sizeof(uf)))
|
|
return -EFAULT;
|
|
|
|
if (!uf.count) {
|
|
/* Disabled */
|
|
filter->count = 0;
|
|
return 0;
|
|
}
|
|
|
|
alen = ETH_ALEN * uf.count;
|
|
addr = kmalloc(alen, GFP_KERNEL);
|
|
if (!addr)
|
|
return -ENOMEM;
|
|
|
|
if (copy_from_user(addr, arg + sizeof(uf), alen)) {
|
|
err = -EFAULT;
|
|
goto done;
|
|
}
|
|
|
|
/* The filter is updated without holding any locks. Which is
|
|
* perfectly safe. We disable it first and in the worst
|
|
* case we'll accept a few undesired packets. */
|
|
filter->count = 0;
|
|
wmb();
|
|
|
|
/* Use first set of addresses as an exact filter */
|
|
for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++)
|
|
memcpy(filter->addr[n], addr[n].u, ETH_ALEN);
|
|
|
|
nexact = n;
|
|
|
|
/* Remaining multicast addresses are hashed,
|
|
* unicast will leave the filter disabled. */
|
|
memset(filter->mask, 0, sizeof(filter->mask));
|
|
for (; n < uf.count; n++) {
|
|
if (!is_multicast_ether_addr(addr[n].u)) {
|
|
err = 0; /* no filter */
|
|
goto done;
|
|
}
|
|
addr_hash_set(filter->mask, addr[n].u);
|
|
}
|
|
|
|
/* For ALLMULTI just set the mask to all ones.
|
|
* This overrides the mask populated above. */
|
|
if ((uf.flags & TUN_FLT_ALLMULTI))
|
|
memset(filter->mask, ~0, sizeof(filter->mask));
|
|
|
|
/* Now enable the filter */
|
|
wmb();
|
|
filter->count = nexact;
|
|
|
|
/* Return the number of exact filters */
|
|
err = nexact;
|
|
|
|
done:
|
|
kfree(addr);
|
|
return err;
|
|
}
|
|
|
|
/* Returns: 0 - drop, !=0 - accept */
|
|
static int run_filter(struct tap_filter *filter, const struct sk_buff *skb)
|
|
{
|
|
/* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect
|
|
* at this point. */
|
|
struct ethhdr *eh = (struct ethhdr *) skb->data;
|
|
int i;
|
|
|
|
/* Exact match */
|
|
for (i = 0; i < filter->count; i++)
|
|
if (!compare_ether_addr(eh->h_dest, filter->addr[i]))
|
|
return 1;
|
|
|
|
/* Inexact match (multicast only) */
|
|
if (is_multicast_ether_addr(eh->h_dest))
|
|
return addr_hash_test(filter->mask, eh->h_dest);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Checks whether the packet is accepted or not.
|
|
* Returns: 0 - drop, !=0 - accept
|
|
*/
|
|
static int check_filter(struct tap_filter *filter, const struct sk_buff *skb)
|
|
{
|
|
if (!filter->count)
|
|
return 1;
|
|
|
|
return run_filter(filter, skb);
|
|
}
|
|
|
|
/* Network device part of the driver */
|
|
|
|
static const struct ethtool_ops tun_ethtool_ops;
|
|
|
|
/* Net device detach from fd. */
|
|
static void tun_net_uninit(struct net_device *dev)
|
|
{
|
|
struct tun_struct *tun = netdev_priv(dev);
|
|
struct tun_file *tfile = tun->tfile;
|
|
|
|
/* Inform the methods they need to stop using the dev.
|
|
*/
|
|
if (tfile) {
|
|
wake_up_all(&tun->wq.wait);
|
|
if (atomic_dec_and_test(&tfile->count))
|
|
__tun_detach(tun);
|
|
}
|
|
}
|
|
|
|
static void tun_free_netdev(struct net_device *dev)
|
|
{
|
|
struct tun_struct *tun = netdev_priv(dev);
|
|
|
|
sock_put(tun->socket.sk);
|
|
}
|
|
|
|
/* Net device open. */
|
|
static int tun_net_open(struct net_device *dev)
|
|
{
|
|
netif_start_queue(dev);
|
|
return 0;
|
|
}
|
|
|
|
/* Net device close. */
|
|
static int tun_net_close(struct net_device *dev)
|
|
{
|
|
netif_stop_queue(dev);
|
|
return 0;
|
|
}
|
|
|
|
/* Net device start xmit */
|
|
static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct tun_struct *tun = netdev_priv(dev);
|
|
|
|
tun_debug(KERN_INFO, tun, "tun_net_xmit %d\n", skb->len);
|
|
|
|
/* Drop packet if interface is not attached */
|
|
if (!tun->tfile)
|
|
goto drop;
|
|
|
|
/* Drop if the filter does not like it.
|
|
* This is a noop if the filter is disabled.
|
|
* Filter can be enabled only for the TAP devices. */
|
|
if (!check_filter(&tun->txflt, skb))
|
|
goto drop;
|
|
|
|
if (tun->socket.sk->sk_filter &&
|
|
sk_filter(tun->socket.sk, skb))
|
|
goto drop;
|
|
|
|
if (skb_queue_len(&tun->socket.sk->sk_receive_queue) >= dev->tx_queue_len) {
|
|
if (!(tun->flags & TUN_ONE_QUEUE)) {
|
|
/* Normal queueing mode. */
|
|
/* Packet scheduler handles dropping of further packets. */
|
|
netif_stop_queue(dev);
|
|
|
|
/* We won't see all dropped packets individually, so overrun
|
|
* error is more appropriate. */
|
|
dev->stats.tx_fifo_errors++;
|
|
} else {
|
|
/* Single queue mode.
|
|
* Driver handles dropping of all packets itself. */
|
|
goto drop;
|
|
}
|
|
}
|
|
|
|
/* Orphan the skb - required as we might hang on to it
|
|
* for indefinite time. */
|
|
skb_orphan(skb);
|
|
|
|
/* Enqueue packet */
|
|
skb_queue_tail(&tun->socket.sk->sk_receive_queue, skb);
|
|
|
|
/* Notify and wake up reader process */
|
|
if (tun->flags & TUN_FASYNC)
|
|
kill_fasync(&tun->fasync, SIGIO, POLL_IN);
|
|
wake_up_interruptible_poll(&tun->wq.wait, POLLIN |
|
|
POLLRDNORM | POLLRDBAND);
|
|
return NETDEV_TX_OK;
|
|
|
|
drop:
|
|
dev->stats.tx_dropped++;
|
|
kfree_skb(skb);
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
static void tun_net_mclist(struct net_device *dev)
|
|
{
|
|
/*
|
|
* This callback is supposed to deal with mc filter in
|
|
* _rx_ path and has nothing to do with the _tx_ path.
|
|
* In rx path we always accept everything userspace gives us.
|
|
*/
|
|
}
|
|
|
|
#define MIN_MTU 68
|
|
#define MAX_MTU 65535
|
|
|
|
static int
|
|
tun_net_change_mtu(struct net_device *dev, int new_mtu)
|
|
{
|
|
if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU)
|
|
return -EINVAL;
|
|
dev->mtu = new_mtu;
|
|
return 0;
|
|
}
|
|
|
|
static u32 tun_net_fix_features(struct net_device *dev, u32 features)
|
|
{
|
|
struct tun_struct *tun = netdev_priv(dev);
|
|
|
|
return (features & tun->set_features) | (features & ~TUN_USER_FEATURES);
|
|
}
|
|
#ifdef CONFIG_NET_POLL_CONTROLLER
|
|
static void tun_poll_controller(struct net_device *dev)
|
|
{
|
|
/*
|
|
* Tun only receives frames when:
|
|
* 1) the char device endpoint gets data from user space
|
|
* 2) the tun socket gets a sendmsg call from user space
|
|
* Since both of those are syncronous operations, we are guaranteed
|
|
* never to have pending data when we poll for it
|
|
* so theres nothing to do here but return.
|
|
* We need this though so netpoll recognizes us as an interface that
|
|
* supports polling, which enables bridge devices in virt setups to
|
|
* still use netconsole
|
|
*/
|
|
return;
|
|
}
|
|
#endif
|
|
static const struct net_device_ops tun_netdev_ops = {
|
|
.ndo_uninit = tun_net_uninit,
|
|
.ndo_open = tun_net_open,
|
|
.ndo_stop = tun_net_close,
|
|
.ndo_start_xmit = tun_net_xmit,
|
|
.ndo_change_mtu = tun_net_change_mtu,
|
|
.ndo_fix_features = tun_net_fix_features,
|
|
#ifdef CONFIG_NET_POLL_CONTROLLER
|
|
.ndo_poll_controller = tun_poll_controller,
|
|
#endif
|
|
};
|
|
|
|
static const struct net_device_ops tap_netdev_ops = {
|
|
.ndo_uninit = tun_net_uninit,
|
|
.ndo_open = tun_net_open,
|
|
.ndo_stop = tun_net_close,
|
|
.ndo_start_xmit = tun_net_xmit,
|
|
.ndo_change_mtu = tun_net_change_mtu,
|
|
.ndo_fix_features = tun_net_fix_features,
|
|
.ndo_set_rx_mode = tun_net_mclist,
|
|
.ndo_set_mac_address = eth_mac_addr,
|
|
.ndo_validate_addr = eth_validate_addr,
|
|
#ifdef CONFIG_NET_POLL_CONTROLLER
|
|
.ndo_poll_controller = tun_poll_controller,
|
|
#endif
|
|
};
|
|
|
|
/* Initialize net device. */
|
|
static void tun_net_init(struct net_device *dev)
|
|
{
|
|
struct tun_struct *tun = netdev_priv(dev);
|
|
|
|
switch (tun->flags & TUN_TYPE_MASK) {
|
|
case TUN_TUN_DEV:
|
|
dev->netdev_ops = &tun_netdev_ops;
|
|
|
|
/* Point-to-Point TUN Device */
|
|
dev->hard_header_len = 0;
|
|
dev->addr_len = 0;
|
|
dev->mtu = 1500;
|
|
|
|
/* Zero header length */
|
|
dev->type = ARPHRD_NONE;
|
|
dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
|
|
dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
|
|
break;
|
|
|
|
case TUN_TAP_DEV:
|
|
dev->netdev_ops = &tap_netdev_ops;
|
|
/* Ethernet TAP Device */
|
|
ether_setup(dev);
|
|
dev->priv_flags &= ~IFF_TX_SKB_SHARING;
|
|
|
|
random_ether_addr(dev->dev_addr);
|
|
|
|
dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Character device part */
|
|
|
|
/* Poll */
|
|
static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
|
|
{
|
|
struct tun_file *tfile = file->private_data;
|
|
struct tun_struct *tun = __tun_get(tfile);
|
|
struct sock *sk;
|
|
unsigned int mask = 0;
|
|
|
|
if (!tun)
|
|
return POLLERR;
|
|
|
|
sk = tun->socket.sk;
|
|
|
|
tun_debug(KERN_INFO, tun, "tun_chr_poll\n");
|
|
|
|
poll_wait(file, &tun->wq.wait, wait);
|
|
|
|
if (!skb_queue_empty(&sk->sk_receive_queue))
|
|
mask |= POLLIN | POLLRDNORM;
|
|
|
|
if (sock_writeable(sk) ||
|
|
(!test_and_set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags) &&
|
|
sock_writeable(sk)))
|
|
mask |= POLLOUT | POLLWRNORM;
|
|
|
|
if (tun->dev->reg_state != NETREG_REGISTERED)
|
|
mask = POLLERR;
|
|
|
|
tun_put(tun);
|
|
return mask;
|
|
}
|
|
|
|
/* prepad is the amount to reserve at front. len is length after that.
|
|
* linear is a hint as to how much to copy (usually headers). */
|
|
static struct sk_buff *tun_alloc_skb(struct tun_struct *tun,
|
|
size_t prepad, size_t len,
|
|
size_t linear, int noblock)
|
|
{
|
|
struct sock *sk = tun->socket.sk;
|
|
struct sk_buff *skb;
|
|
int err;
|
|
|
|
sock_update_classid(sk);
|
|
|
|
/* Under a page? Don't bother with paged skb. */
|
|
if (prepad + len < PAGE_SIZE || !linear)
|
|
linear = len;
|
|
|
|
skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
|
|
&err);
|
|
if (!skb)
|
|
return ERR_PTR(err);
|
|
|
|
skb_reserve(skb, prepad);
|
|
skb_put(skb, linear);
|
|
skb->data_len = len - linear;
|
|
skb->len += len - linear;
|
|
|
|
return skb;
|
|
}
|
|
|
|
/* Get packet from user space buffer */
|
|
static ssize_t tun_get_user(struct tun_struct *tun,
|
|
const struct iovec *iv, size_t count,
|
|
int noblock)
|
|
{
|
|
struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) };
|
|
struct sk_buff *skb;
|
|
size_t len = count, align = NET_SKB_PAD;
|
|
struct virtio_net_hdr gso = { 0 };
|
|
int offset = 0;
|
|
|
|
if (!(tun->flags & TUN_NO_PI)) {
|
|
if ((len -= sizeof(pi)) > count)
|
|
return -EINVAL;
|
|
|
|
if (memcpy_fromiovecend((void *)&pi, iv, 0, sizeof(pi)))
|
|
return -EFAULT;
|
|
offset += sizeof(pi);
|
|
}
|
|
|
|
if (tun->flags & TUN_VNET_HDR) {
|
|
if ((len -= tun->vnet_hdr_sz) > count)
|
|
return -EINVAL;
|
|
|
|
if (memcpy_fromiovecend((void *)&gso, iv, offset, sizeof(gso)))
|
|
return -EFAULT;
|
|
|
|
if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
|
|
gso.csum_start + gso.csum_offset + 2 > gso.hdr_len)
|
|
gso.hdr_len = gso.csum_start + gso.csum_offset + 2;
|
|
|
|
if (gso.hdr_len > len)
|
|
return -EINVAL;
|
|
offset += tun->vnet_hdr_sz;
|
|
}
|
|
|
|
if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) {
|
|
align += NET_IP_ALIGN;
|
|
if (unlikely(len < ETH_HLEN ||
|
|
(gso.hdr_len && gso.hdr_len < ETH_HLEN)))
|
|
return -EINVAL;
|
|
}
|
|
|
|
skb = tun_alloc_skb(tun, align, len, gso.hdr_len, noblock);
|
|
if (IS_ERR(skb)) {
|
|
if (PTR_ERR(skb) != -EAGAIN)
|
|
tun->dev->stats.rx_dropped++;
|
|
return PTR_ERR(skb);
|
|
}
|
|
|
|
if (skb_copy_datagram_from_iovec(skb, 0, iv, offset, len)) {
|
|
tun->dev->stats.rx_dropped++;
|
|
kfree_skb(skb);
|
|
return -EFAULT;
|
|
}
|
|
|
|
if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
|
|
if (!skb_partial_csum_set(skb, gso.csum_start,
|
|
gso.csum_offset)) {
|
|
tun->dev->stats.rx_frame_errors++;
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
switch (tun->flags & TUN_TYPE_MASK) {
|
|
case TUN_TUN_DEV:
|
|
if (tun->flags & TUN_NO_PI) {
|
|
switch (skb->data[0] & 0xf0) {
|
|
case 0x40:
|
|
pi.proto = htons(ETH_P_IP);
|
|
break;
|
|
case 0x60:
|
|
pi.proto = htons(ETH_P_IPV6);
|
|
break;
|
|
default:
|
|
tun->dev->stats.rx_dropped++;
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
skb_reset_mac_header(skb);
|
|
skb->protocol = pi.proto;
|
|
skb->dev = tun->dev;
|
|
break;
|
|
case TUN_TAP_DEV:
|
|
skb->protocol = eth_type_trans(skb, tun->dev);
|
|
break;
|
|
}
|
|
|
|
if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
|
|
pr_debug("GSO!\n");
|
|
switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
|
|
case VIRTIO_NET_HDR_GSO_TCPV4:
|
|
skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
|
|
break;
|
|
case VIRTIO_NET_HDR_GSO_TCPV6:
|
|
skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
|
|
break;
|
|
case VIRTIO_NET_HDR_GSO_UDP:
|
|
skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
|
|
break;
|
|
default:
|
|
tun->dev->stats.rx_frame_errors++;
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN)
|
|
skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
|
|
|
|
skb_shinfo(skb)->gso_size = gso.gso_size;
|
|
if (skb_shinfo(skb)->gso_size == 0) {
|
|
tun->dev->stats.rx_frame_errors++;
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Header must be checked, and gso_segs computed. */
|
|
skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
|
|
skb_shinfo(skb)->gso_segs = 0;
|
|
}
|
|
|
|
netif_rx_ni(skb);
|
|
|
|
tun->dev->stats.rx_packets++;
|
|
tun->dev->stats.rx_bytes += len;
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv,
|
|
unsigned long count, loff_t pos)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
struct tun_struct *tun = tun_get(file);
|
|
ssize_t result;
|
|
|
|
if (!tun)
|
|
return -EBADFD;
|
|
|
|
tun_debug(KERN_INFO, tun, "tun_chr_write %ld\n", count);
|
|
|
|
result = tun_get_user(tun, iv, iov_length(iv, count),
|
|
file->f_flags & O_NONBLOCK);
|
|
|
|
tun_put(tun);
|
|
return result;
|
|
}
|
|
|
|
/* Put packet to the user space buffer */
|
|
static ssize_t tun_put_user(struct tun_struct *tun,
|
|
struct sk_buff *skb,
|
|
const struct iovec *iv, int len)
|
|
{
|
|
struct tun_pi pi = { 0, skb->protocol };
|
|
ssize_t total = 0;
|
|
|
|
if (!(tun->flags & TUN_NO_PI)) {
|
|
if ((len -= sizeof(pi)) < 0)
|
|
return -EINVAL;
|
|
|
|
if (len < skb->len) {
|
|
/* Packet will be striped */
|
|
pi.flags |= TUN_PKT_STRIP;
|
|
}
|
|
|
|
if (memcpy_toiovecend(iv, (void *) &pi, 0, sizeof(pi)))
|
|
return -EFAULT;
|
|
total += sizeof(pi);
|
|
}
|
|
|
|
if (tun->flags & TUN_VNET_HDR) {
|
|
struct virtio_net_hdr gso = { 0 }; /* no info leak */
|
|
if ((len -= tun->vnet_hdr_sz) < 0)
|
|
return -EINVAL;
|
|
|
|
if (skb_is_gso(skb)) {
|
|
struct skb_shared_info *sinfo = skb_shinfo(skb);
|
|
|
|
/* This is a hint as to how much should be linear. */
|
|
gso.hdr_len = skb_headlen(skb);
|
|
gso.gso_size = sinfo->gso_size;
|
|
if (sinfo->gso_type & SKB_GSO_TCPV4)
|
|
gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
|
|
else if (sinfo->gso_type & SKB_GSO_TCPV6)
|
|
gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
|
|
else if (sinfo->gso_type & SKB_GSO_UDP)
|
|
gso.gso_type = VIRTIO_NET_HDR_GSO_UDP;
|
|
else {
|
|
pr_err("unexpected GSO type: "
|
|
"0x%x, gso_size %d, hdr_len %d\n",
|
|
sinfo->gso_type, gso.gso_size,
|
|
gso.hdr_len);
|
|
print_hex_dump(KERN_ERR, "tun: ",
|
|
DUMP_PREFIX_NONE,
|
|
16, 1, skb->head,
|
|
min((int)gso.hdr_len, 64), true);
|
|
WARN_ON_ONCE(1);
|
|
return -EINVAL;
|
|
}
|
|
if (sinfo->gso_type & SKB_GSO_TCP_ECN)
|
|
gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
|
|
} else
|
|
gso.gso_type = VIRTIO_NET_HDR_GSO_NONE;
|
|
|
|
if (skb->ip_summed == CHECKSUM_PARTIAL) {
|
|
gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
|
|
gso.csum_start = skb_checksum_start_offset(skb);
|
|
gso.csum_offset = skb->csum_offset;
|
|
} else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
|
|
gso.flags = VIRTIO_NET_HDR_F_DATA_VALID;
|
|
} /* else everything is zero */
|
|
|
|
if (unlikely(memcpy_toiovecend(iv, (void *)&gso, total,
|
|
sizeof(gso))))
|
|
return -EFAULT;
|
|
total += tun->vnet_hdr_sz;
|
|
}
|
|
|
|
len = min_t(int, skb->len, len);
|
|
|
|
skb_copy_datagram_const_iovec(skb, 0, iv, total, len);
|
|
total += skb->len;
|
|
|
|
tun->dev->stats.tx_packets++;
|
|
tun->dev->stats.tx_bytes += len;
|
|
|
|
return total;
|
|
}
|
|
|
|
static ssize_t tun_do_read(struct tun_struct *tun,
|
|
struct kiocb *iocb, const struct iovec *iv,
|
|
ssize_t len, int noblock)
|
|
{
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
struct sk_buff *skb;
|
|
ssize_t ret = 0;
|
|
|
|
tun_debug(KERN_INFO, tun, "tun_chr_read\n");
|
|
|
|
if (unlikely(!noblock))
|
|
add_wait_queue(&tun->wq.wait, &wait);
|
|
while (len) {
|
|
current->state = TASK_INTERRUPTIBLE;
|
|
|
|
/* Read frames from the queue */
|
|
if (!(skb=skb_dequeue(&tun->socket.sk->sk_receive_queue))) {
|
|
if (noblock) {
|
|
ret = -EAGAIN;
|
|
break;
|
|
}
|
|
if (signal_pending(current)) {
|
|
ret = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
if (tun->dev->reg_state != NETREG_REGISTERED) {
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
|
|
/* Nothing to read, let's sleep */
|
|
schedule();
|
|
continue;
|
|
}
|
|
netif_wake_queue(tun->dev);
|
|
|
|
ret = tun_put_user(tun, skb, iv, len);
|
|
kfree_skb(skb);
|
|
break;
|
|
}
|
|
|
|
current->state = TASK_RUNNING;
|
|
if (unlikely(!noblock))
|
|
remove_wait_queue(&tun->wq.wait, &wait);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
|
|
unsigned long count, loff_t pos)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
struct tun_file *tfile = file->private_data;
|
|
struct tun_struct *tun = __tun_get(tfile);
|
|
ssize_t len, ret;
|
|
|
|
if (!tun)
|
|
return -EBADFD;
|
|
len = iov_length(iv, count);
|
|
if (len < 0) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
ret = tun_do_read(tun, iocb, iv, len, file->f_flags & O_NONBLOCK);
|
|
ret = min_t(ssize_t, ret, len);
|
|
out:
|
|
tun_put(tun);
|
|
return ret;
|
|
}
|
|
|
|
static void tun_setup(struct net_device *dev)
|
|
{
|
|
struct tun_struct *tun = netdev_priv(dev);
|
|
|
|
tun->owner = -1;
|
|
tun->group = -1;
|
|
|
|
dev->ethtool_ops = &tun_ethtool_ops;
|
|
dev->destructor = tun_free_netdev;
|
|
}
|
|
|
|
/* Trivial set of netlink ops to allow deleting tun or tap
|
|
* device with netlink.
|
|
*/
|
|
static int tun_validate(struct nlattr *tb[], struct nlattr *data[])
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static struct rtnl_link_ops tun_link_ops __read_mostly = {
|
|
.kind = DRV_NAME,
|
|
.priv_size = sizeof(struct tun_struct),
|
|
.setup = tun_setup,
|
|
.validate = tun_validate,
|
|
};
|
|
|
|
static void tun_sock_write_space(struct sock *sk)
|
|
{
|
|
struct tun_struct *tun;
|
|
wait_queue_head_t *wqueue;
|
|
|
|
if (!sock_writeable(sk))
|
|
return;
|
|
|
|
if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags))
|
|
return;
|
|
|
|
wqueue = sk_sleep(sk);
|
|
if (wqueue && waitqueue_active(wqueue))
|
|
wake_up_interruptible_sync_poll(wqueue, POLLOUT |
|
|
POLLWRNORM | POLLWRBAND);
|
|
|
|
tun = tun_sk(sk)->tun;
|
|
kill_fasync(&tun->fasync, SIGIO, POLL_OUT);
|
|
}
|
|
|
|
static void tun_sock_destruct(struct sock *sk)
|
|
{
|
|
free_netdev(tun_sk(sk)->tun->dev);
|
|
}
|
|
|
|
static int tun_sendmsg(struct kiocb *iocb, struct socket *sock,
|
|
struct msghdr *m, size_t total_len)
|
|
{
|
|
struct tun_struct *tun = container_of(sock, struct tun_struct, socket);
|
|
return tun_get_user(tun, m->msg_iov, total_len,
|
|
m->msg_flags & MSG_DONTWAIT);
|
|
}
|
|
|
|
static int tun_recvmsg(struct kiocb *iocb, struct socket *sock,
|
|
struct msghdr *m, size_t total_len,
|
|
int flags)
|
|
{
|
|
struct tun_struct *tun = container_of(sock, struct tun_struct, socket);
|
|
int ret;
|
|
if (flags & ~(MSG_DONTWAIT|MSG_TRUNC))
|
|
return -EINVAL;
|
|
ret = tun_do_read(tun, iocb, m->msg_iov, total_len,
|
|
flags & MSG_DONTWAIT);
|
|
if (ret > total_len) {
|
|
m->msg_flags |= MSG_TRUNC;
|
|
ret = flags & MSG_TRUNC ? ret : total_len;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/* Ops structure to mimic raw sockets with tun */
|
|
static const struct proto_ops tun_socket_ops = {
|
|
.sendmsg = tun_sendmsg,
|
|
.recvmsg = tun_recvmsg,
|
|
};
|
|
|
|
static struct proto tun_proto = {
|
|
.name = "tun",
|
|
.owner = THIS_MODULE,
|
|
.obj_size = sizeof(struct tun_sock),
|
|
};
|
|
|
|
static int tun_flags(struct tun_struct *tun)
|
|
{
|
|
int flags = 0;
|
|
|
|
if (tun->flags & TUN_TUN_DEV)
|
|
flags |= IFF_TUN;
|
|
else
|
|
flags |= IFF_TAP;
|
|
|
|
if (tun->flags & TUN_NO_PI)
|
|
flags |= IFF_NO_PI;
|
|
|
|
if (tun->flags & TUN_ONE_QUEUE)
|
|
flags |= IFF_ONE_QUEUE;
|
|
|
|
if (tun->flags & TUN_VNET_HDR)
|
|
flags |= IFF_VNET_HDR;
|
|
|
|
return flags;
|
|
}
|
|
|
|
static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct tun_struct *tun = netdev_priv(to_net_dev(dev));
|
|
return sprintf(buf, "0x%x\n", tun_flags(tun));
|
|
}
|
|
|
|
static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct tun_struct *tun = netdev_priv(to_net_dev(dev));
|
|
return sprintf(buf, "%d\n", tun->owner);
|
|
}
|
|
|
|
static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct tun_struct *tun = netdev_priv(to_net_dev(dev));
|
|
return sprintf(buf, "%d\n", tun->group);
|
|
}
|
|
|
|
static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL);
|
|
static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL);
|
|
static DEVICE_ATTR(group, 0444, tun_show_group, NULL);
|
|
|
|
static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
|
|
{
|
|
struct sock *sk;
|
|
struct tun_struct *tun;
|
|
struct net_device *dev;
|
|
int err;
|
|
|
|
dev = __dev_get_by_name(net, ifr->ifr_name);
|
|
if (dev) {
|
|
const struct cred *cred = current_cred();
|
|
|
|
if (ifr->ifr_flags & IFF_TUN_EXCL)
|
|
return -EBUSY;
|
|
if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops)
|
|
tun = netdev_priv(dev);
|
|
else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops)
|
|
tun = netdev_priv(dev);
|
|
else
|
|
return -EINVAL;
|
|
|
|
if (((tun->owner != -1 && cred->euid != tun->owner) ||
|
|
(tun->group != -1 && !in_egroup_p(tun->group))) &&
|
|
!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
err = security_tun_dev_attach(tun->socket.sk);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = tun_attach(tun, file);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
else {
|
|
char *name;
|
|
unsigned long flags = 0;
|
|
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
err = security_tun_dev_create();
|
|
if (err < 0)
|
|
return err;
|
|
|
|
/* Set dev type */
|
|
if (ifr->ifr_flags & IFF_TUN) {
|
|
/* TUN device */
|
|
flags |= TUN_TUN_DEV;
|
|
name = "tun%d";
|
|
} else if (ifr->ifr_flags & IFF_TAP) {
|
|
/* TAP device */
|
|
flags |= TUN_TAP_DEV;
|
|
name = "tap%d";
|
|
} else
|
|
return -EINVAL;
|
|
|
|
if (*ifr->ifr_name)
|
|
name = ifr->ifr_name;
|
|
|
|
dev = alloc_netdev(sizeof(struct tun_struct), name,
|
|
tun_setup);
|
|
if (!dev)
|
|
return -ENOMEM;
|
|
|
|
dev_net_set(dev, net);
|
|
dev->rtnl_link_ops = &tun_link_ops;
|
|
|
|
tun = netdev_priv(dev);
|
|
tun->dev = dev;
|
|
tun->flags = flags;
|
|
tun->txflt.count = 0;
|
|
tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr);
|
|
|
|
err = -ENOMEM;
|
|
sk = sk_alloc(net, AF_UNSPEC, GFP_KERNEL, &tun_proto);
|
|
if (!sk)
|
|
goto err_free_dev;
|
|
|
|
tun->socket.wq = &tun->wq;
|
|
init_waitqueue_head(&tun->wq.wait);
|
|
tun->socket.ops = &tun_socket_ops;
|
|
sock_init_data(&tun->socket, sk);
|
|
sk->sk_write_space = tun_sock_write_space;
|
|
sk->sk_sndbuf = INT_MAX;
|
|
|
|
tun_sk(sk)->tun = tun;
|
|
|
|
security_tun_dev_post_create(sk);
|
|
|
|
tun_net_init(dev);
|
|
|
|
dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST |
|
|
TUN_USER_FEATURES;
|
|
dev->features = dev->hw_features;
|
|
|
|
err = register_netdevice(tun->dev);
|
|
if (err < 0)
|
|
goto err_free_sk;
|
|
|
|
if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) ||
|
|
device_create_file(&tun->dev->dev, &dev_attr_owner) ||
|
|
device_create_file(&tun->dev->dev, &dev_attr_group))
|
|
pr_err("Failed to create tun sysfs files\n");
|
|
|
|
sk->sk_destruct = tun_sock_destruct;
|
|
|
|
err = tun_attach(tun, file);
|
|
if (err < 0)
|
|
goto failed;
|
|
}
|
|
|
|
tun_debug(KERN_INFO, tun, "tun_set_iff\n");
|
|
|
|
if (ifr->ifr_flags & IFF_NO_PI)
|
|
tun->flags |= TUN_NO_PI;
|
|
else
|
|
tun->flags &= ~TUN_NO_PI;
|
|
|
|
if (ifr->ifr_flags & IFF_ONE_QUEUE)
|
|
tun->flags |= TUN_ONE_QUEUE;
|
|
else
|
|
tun->flags &= ~TUN_ONE_QUEUE;
|
|
|
|
if (ifr->ifr_flags & IFF_VNET_HDR)
|
|
tun->flags |= TUN_VNET_HDR;
|
|
else
|
|
tun->flags &= ~TUN_VNET_HDR;
|
|
|
|
/* Make sure persistent devices do not get stuck in
|
|
* xoff state.
|
|
*/
|
|
if (netif_running(tun->dev))
|
|
netif_wake_queue(tun->dev);
|
|
|
|
strcpy(ifr->ifr_name, tun->dev->name);
|
|
return 0;
|
|
|
|
err_free_sk:
|
|
sock_put(sk);
|
|
err_free_dev:
|
|
free_netdev(dev);
|
|
failed:
|
|
return err;
|
|
}
|
|
|
|
static int tun_get_iff(struct net *net, struct tun_struct *tun,
|
|
struct ifreq *ifr)
|
|
{
|
|
tun_debug(KERN_INFO, tun, "tun_get_iff\n");
|
|
|
|
strcpy(ifr->ifr_name, tun->dev->name);
|
|
|
|
ifr->ifr_flags = tun_flags(tun);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* This is like a cut-down ethtool ops, except done via tun fd so no
|
|
* privs required. */
|
|
static int set_offload(struct tun_struct *tun, unsigned long arg)
|
|
{
|
|
u32 features = 0;
|
|
|
|
if (arg & TUN_F_CSUM) {
|
|
features |= NETIF_F_HW_CSUM;
|
|
arg &= ~TUN_F_CSUM;
|
|
|
|
if (arg & (TUN_F_TSO4|TUN_F_TSO6)) {
|
|
if (arg & TUN_F_TSO_ECN) {
|
|
features |= NETIF_F_TSO_ECN;
|
|
arg &= ~TUN_F_TSO_ECN;
|
|
}
|
|
if (arg & TUN_F_TSO4)
|
|
features |= NETIF_F_TSO;
|
|
if (arg & TUN_F_TSO6)
|
|
features |= NETIF_F_TSO6;
|
|
arg &= ~(TUN_F_TSO4|TUN_F_TSO6);
|
|
}
|
|
|
|
if (arg & TUN_F_UFO) {
|
|
features |= NETIF_F_UFO;
|
|
arg &= ~TUN_F_UFO;
|
|
}
|
|
}
|
|
|
|
/* This gives the user a way to test for new features in future by
|
|
* trying to set them. */
|
|
if (arg)
|
|
return -EINVAL;
|
|
|
|
tun->set_features = features;
|
|
netdev_update_features(tun->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg, int ifreq_len)
|
|
{
|
|
struct tun_file *tfile = file->private_data;
|
|
struct tun_struct *tun;
|
|
void __user* argp = (void __user*)arg;
|
|
struct sock_fprog fprog;
|
|
struct ifreq ifr;
|
|
int sndbuf;
|
|
int vnet_hdr_sz;
|
|
int ret;
|
|
|
|
if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89)
|
|
if (copy_from_user(&ifr, argp, ifreq_len))
|
|
return -EFAULT;
|
|
|
|
if (cmd == TUNGETFEATURES) {
|
|
/* Currently this just means: "what IFF flags are valid?".
|
|
* This is needed because we never checked for invalid flags on
|
|
* TUNSETIFF. */
|
|
return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE |
|
|
IFF_VNET_HDR,
|
|
(unsigned int __user*)argp);
|
|
}
|
|
|
|
rtnl_lock();
|
|
|
|
tun = __tun_get(tfile);
|
|
if (cmd == TUNSETIFF && !tun) {
|
|
ifr.ifr_name[IFNAMSIZ-1] = '\0';
|
|
|
|
ret = tun_set_iff(tfile->net, file, &ifr);
|
|
|
|
if (ret)
|
|
goto unlock;
|
|
|
|
if (copy_to_user(argp, &ifr, ifreq_len))
|
|
ret = -EFAULT;
|
|
goto unlock;
|
|
}
|
|
|
|
ret = -EBADFD;
|
|
if (!tun)
|
|
goto unlock;
|
|
|
|
tun_debug(KERN_INFO, tun, "tun_chr_ioctl cmd %d\n", cmd);
|
|
|
|
ret = 0;
|
|
switch (cmd) {
|
|
case TUNGETIFF:
|
|
ret = tun_get_iff(current->nsproxy->net_ns, tun, &ifr);
|
|
if (ret)
|
|
break;
|
|
|
|
if (copy_to_user(argp, &ifr, ifreq_len))
|
|
ret = -EFAULT;
|
|
break;
|
|
|
|
case TUNSETNOCSUM:
|
|
/* Disable/Enable checksum */
|
|
|
|
/* [unimplemented] */
|
|
tun_debug(KERN_INFO, tun, "ignored: set checksum %s\n",
|
|
arg ? "disabled" : "enabled");
|
|
break;
|
|
|
|
case TUNSETPERSIST:
|
|
/* Disable/Enable persist mode */
|
|
if (arg)
|
|
tun->flags |= TUN_PERSIST;
|
|
else
|
|
tun->flags &= ~TUN_PERSIST;
|
|
|
|
tun_debug(KERN_INFO, tun, "persist %s\n",
|
|
arg ? "enabled" : "disabled");
|
|
break;
|
|
|
|
case TUNSETOWNER:
|
|
/* Set owner of the device */
|
|
tun->owner = (uid_t) arg;
|
|
|
|
tun_debug(KERN_INFO, tun, "owner set to %d\n", tun->owner);
|
|
break;
|
|
|
|
case TUNSETGROUP:
|
|
/* Set group of the device */
|
|
tun->group= (gid_t) arg;
|
|
|
|
tun_debug(KERN_INFO, tun, "group set to %d\n", tun->group);
|
|
break;
|
|
|
|
case TUNSETLINK:
|
|
/* Only allow setting the type when the interface is down */
|
|
if (tun->dev->flags & IFF_UP) {
|
|
tun_debug(KERN_INFO, tun,
|
|
"Linktype set failed because interface is up\n");
|
|
ret = -EBUSY;
|
|
} else {
|
|
tun->dev->type = (int) arg;
|
|
tun_debug(KERN_INFO, tun, "linktype set to %d\n",
|
|
tun->dev->type);
|
|
ret = 0;
|
|
}
|
|
break;
|
|
|
|
#ifdef TUN_DEBUG
|
|
case TUNSETDEBUG:
|
|
tun->debug = arg;
|
|
break;
|
|
#endif
|
|
case TUNSETOFFLOAD:
|
|
ret = set_offload(tun, arg);
|
|
break;
|
|
|
|
case TUNSETTXFILTER:
|
|
/* Can be set only for TAPs */
|
|
ret = -EINVAL;
|
|
if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV)
|
|
break;
|
|
ret = update_filter(&tun->txflt, (void __user *)arg);
|
|
break;
|
|
|
|
case SIOCGIFHWADDR:
|
|
/* Get hw address */
|
|
memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN);
|
|
ifr.ifr_hwaddr.sa_family = tun->dev->type;
|
|
if (copy_to_user(argp, &ifr, ifreq_len))
|
|
ret = -EFAULT;
|
|
break;
|
|
|
|
case SIOCSIFHWADDR:
|
|
/* Set hw address */
|
|
tun_debug(KERN_DEBUG, tun, "set hw address: %pM\n",
|
|
ifr.ifr_hwaddr.sa_data);
|
|
|
|
ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr);
|
|
break;
|
|
|
|
case TUNGETSNDBUF:
|
|
sndbuf = tun->socket.sk->sk_sndbuf;
|
|
if (copy_to_user(argp, &sndbuf, sizeof(sndbuf)))
|
|
ret = -EFAULT;
|
|
break;
|
|
|
|
case TUNSETSNDBUF:
|
|
if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) {
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
tun->socket.sk->sk_sndbuf = sndbuf;
|
|
break;
|
|
|
|
case TUNGETVNETHDRSZ:
|
|
vnet_hdr_sz = tun->vnet_hdr_sz;
|
|
if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz)))
|
|
ret = -EFAULT;
|
|
break;
|
|
|
|
case TUNSETVNETHDRSZ:
|
|
if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) {
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
tun->vnet_hdr_sz = vnet_hdr_sz;
|
|
break;
|
|
|
|
case TUNATTACHFILTER:
|
|
/* Can be set only for TAPs */
|
|
ret = -EINVAL;
|
|
if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV)
|
|
break;
|
|
ret = -EFAULT;
|
|
if (copy_from_user(&fprog, argp, sizeof(fprog)))
|
|
break;
|
|
|
|
ret = sk_attach_filter(&fprog, tun->socket.sk);
|
|
break;
|
|
|
|
case TUNDETACHFILTER:
|
|
/* Can be set only for TAPs */
|
|
ret = -EINVAL;
|
|
if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV)
|
|
break;
|
|
ret = sk_detach_filter(tun->socket.sk);
|
|
break;
|
|
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
unlock:
|
|
rtnl_unlock();
|
|
if (tun)
|
|
tun_put(tun);
|
|
return ret;
|
|
}
|
|
|
|
static long tun_chr_ioctl(struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq));
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static long tun_chr_compat_ioctl(struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
switch (cmd) {
|
|
case TUNSETIFF:
|
|
case TUNGETIFF:
|
|
case TUNSETTXFILTER:
|
|
case TUNGETSNDBUF:
|
|
case TUNSETSNDBUF:
|
|
case SIOCGIFHWADDR:
|
|
case SIOCSIFHWADDR:
|
|
arg = (unsigned long)compat_ptr(arg);
|
|
break;
|
|
default:
|
|
arg = (compat_ulong_t)arg;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* compat_ifreq is shorter than ifreq, so we must not access beyond
|
|
* the end of that structure. All fields that are used in this
|
|
* driver are compatible though, we don't need to convert the
|
|
* contents.
|
|
*/
|
|
return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq));
|
|
}
|
|
#endif /* CONFIG_COMPAT */
|
|
|
|
static int tun_chr_fasync(int fd, struct file *file, int on)
|
|
{
|
|
struct tun_struct *tun = tun_get(file);
|
|
int ret;
|
|
|
|
if (!tun)
|
|
return -EBADFD;
|
|
|
|
tun_debug(KERN_INFO, tun, "tun_chr_fasync %d\n", on);
|
|
|
|
if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0)
|
|
goto out;
|
|
|
|
if (on) {
|
|
ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0);
|
|
if (ret)
|
|
goto out;
|
|
tun->flags |= TUN_FASYNC;
|
|
} else
|
|
tun->flags &= ~TUN_FASYNC;
|
|
ret = 0;
|
|
out:
|
|
tun_put(tun);
|
|
return ret;
|
|
}
|
|
|
|
static int tun_chr_open(struct inode *inode, struct file * file)
|
|
{
|
|
struct tun_file *tfile;
|
|
|
|
DBG1(KERN_INFO, "tunX: tun_chr_open\n");
|
|
|
|
tfile = kmalloc(sizeof(*tfile), GFP_KERNEL);
|
|
if (!tfile)
|
|
return -ENOMEM;
|
|
atomic_set(&tfile->count, 0);
|
|
tfile->tun = NULL;
|
|
tfile->net = get_net(current->nsproxy->net_ns);
|
|
file->private_data = tfile;
|
|
return 0;
|
|
}
|
|
|
|
static int tun_chr_close(struct inode *inode, struct file *file)
|
|
{
|
|
struct tun_file *tfile = file->private_data;
|
|
struct tun_struct *tun;
|
|
|
|
tun = __tun_get(tfile);
|
|
if (tun) {
|
|
struct net_device *dev = tun->dev;
|
|
|
|
tun_debug(KERN_INFO, tun, "tun_chr_close\n");
|
|
|
|
__tun_detach(tun);
|
|
|
|
/* If desirable, unregister the netdevice. */
|
|
if (!(tun->flags & TUN_PERSIST)) {
|
|
rtnl_lock();
|
|
if (dev->reg_state == NETREG_REGISTERED)
|
|
unregister_netdevice(dev);
|
|
rtnl_unlock();
|
|
}
|
|
}
|
|
|
|
tun = tfile->tun;
|
|
if (tun)
|
|
sock_put(tun->socket.sk);
|
|
|
|
put_net(tfile->net);
|
|
kfree(tfile);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations tun_fops = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = no_llseek,
|
|
.read = do_sync_read,
|
|
.aio_read = tun_chr_aio_read,
|
|
.write = do_sync_write,
|
|
.aio_write = tun_chr_aio_write,
|
|
.poll = tun_chr_poll,
|
|
.unlocked_ioctl = tun_chr_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = tun_chr_compat_ioctl,
|
|
#endif
|
|
.open = tun_chr_open,
|
|
.release = tun_chr_close,
|
|
.fasync = tun_chr_fasync
|
|
};
|
|
|
|
static struct miscdevice tun_miscdev = {
|
|
.minor = TUN_MINOR,
|
|
.name = "tun",
|
|
.nodename = "net/tun",
|
|
.fops = &tun_fops,
|
|
};
|
|
|
|
/* ethtool interface */
|
|
|
|
static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
|
|
{
|
|
cmd->supported = 0;
|
|
cmd->advertising = 0;
|
|
ethtool_cmd_speed_set(cmd, 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 const 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 = ethtool_op_get_link,
|
|
};
|
|
|
|
|
|
static int __init tun_init(void)
|
|
{
|
|
int ret = 0;
|
|
|
|
pr_info("%s, %s\n", DRV_DESCRIPTION, DRV_VERSION);
|
|
pr_info("%s\n", DRV_COPYRIGHT);
|
|
|
|
ret = rtnl_link_register(&tun_link_ops);
|
|
if (ret) {
|
|
pr_err("Can't register link_ops\n");
|
|
goto err_linkops;
|
|
}
|
|
|
|
ret = misc_register(&tun_miscdev);
|
|
if (ret) {
|
|
pr_err("Can't register misc device %d\n", TUN_MINOR);
|
|
goto err_misc;
|
|
}
|
|
return 0;
|
|
err_misc:
|
|
rtnl_link_unregister(&tun_link_ops);
|
|
err_linkops:
|
|
return ret;
|
|
}
|
|
|
|
static void tun_cleanup(void)
|
|
{
|
|
misc_deregister(&tun_miscdev);
|
|
rtnl_link_unregister(&tun_link_ops);
|
|
}
|
|
|
|
/* Get an underlying socket object from tun file. Returns error unless file is
|
|
* attached to a device. The returned object works like a packet socket, it
|
|
* can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for
|
|
* holding a reference to the file for as long as the socket is in use. */
|
|
struct socket *tun_get_socket(struct file *file)
|
|
{
|
|
struct tun_struct *tun;
|
|
if (file->f_op != &tun_fops)
|
|
return ERR_PTR(-EINVAL);
|
|
tun = tun_get(file);
|
|
if (!tun)
|
|
return ERR_PTR(-EBADFD);
|
|
tun_put(tun);
|
|
return &tun->socket;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tun_get_socket);
|
|
|
|
module_init(tun_init);
|
|
module_exit(tun_cleanup);
|
|
MODULE_DESCRIPTION(DRV_DESCRIPTION);
|
|
MODULE_AUTHOR(DRV_COPYRIGHT);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_MISCDEV(TUN_MINOR);
|
|
MODULE_ALIAS("devname:net/tun");
|