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Date: Sun, 14 Feb 2010 13:01:10 +0200 From: "Michael S. Tsirkin" <mst@...hat.com> To: unlisted-recipients:; (no To-header on input) Cc: "David S. Miller" <davem@...emloft.net>, Herbert Xu <herbert@...dor.apana.org.au>, "Michael S. Tsirkin" <mst@...hat.com>, Paul Moore <paul.moore@...com>, David Woodhouse <David.Woodhouse@...el.com>, Sridhar Samudrala <sri@...ibm.com>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCH 2/2] tun: socket filter support This patch adds Linux Socket Filter support to tun driver. Signed-off-by: Michael S. Tsirkin <mst@...hat.com> --- drivers/net/tun.c | 26 ++++++++++++++++++++++++++ include/linux/if_tun.h | 3 +++ 2 files changed, 29 insertions(+), 0 deletions(-) diff --git a/drivers/net/tun.c b/drivers/net/tun.c index 5adb3d1..ce1efa4 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; diff --git a/include/linux/if_tun.h b/include/linux/if_tun.h index 404abe0..1350a24 100644 --- a/include/linux/if_tun.h +++ b/include/linux/if_tun.h @@ -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 -- 1.6.6.144.g5c3af -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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