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Commit 99405162 authored by Michael S. Tsirkin's avatar Michael S. Tsirkin Committed by David S. Miller
Browse files

tun: socket filter support 



This patch adds Linux Socket Filter support to
tun driver.

Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 5ff3f073

drivers/net/tun.c

+26 −0
Original line number Diff line number Diff line
@@ -61,6 +61,7 @@ 
#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>
@@ -366,6 +367,10 @@ static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) 
	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. */
@@ -1162,6 +1167,7 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd, 
	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 ret;
@@ -1309,6 +1315,26 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd, 
		tun->socket.sk->sk_sndbuf = sndbuf;

		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;

include/linux/if_tun.h

+3 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 


#include <linux/types.h>

#include <linux/if_ether.h>

#include <linux/filter.h>



/* Read queue size */

#define TUN_READQ_SIZE	500
@@ -48,6 +49,8 @@ 
#define TUNGETIFF      _IOR('T', 210, unsigned int)

#define TUNGETSNDBUF   _IOR('T', 211, int)

#define TUNSETSNDBUF   _IOW('T', 212, int)

#define TUNATTACHFILTER _IOW('T', 213, struct sock_fprog)

#define TUNDETACHFILTER _IOW('T', 214, struct sock_fprog)



/* TUNSETIFF ifr flags */

#define IFF_TUN		0x0001