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authorMichael S. Tsirkin <mst@redhat.com>2010-02-14 01:01:10 +0000
committerDavid S. Miller <davem@davemloft.net>2010-02-17 16:35:17 -0800
commit99405162598176e830d17ae6d4f3d9e070ad900c (patch)
tree41a23acd64d3f18de729c2abadc98f7c4687aa45 /drivers/net/tun.c
parent5ff3f073670b544a9c0547cc6fef1f7eed5762ed (diff)
tun: socket filter support
This patch adds Linux Socket Filter support to tun driver. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/tun.c')
-rw-r--r--drivers/net/tun.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 5adb3d150552..ce1efa4c0b0d 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -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;