tun: Allow tap device to send/receive UFO packets.

- Allow setting UFO on tap device and handle UFO packets.

Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>

---------------------------------------------------------
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 13 insertions, 1 deletions

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index dfc1054e4cbd..a998b6a9c245 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -641,6 +641,9 @@ static __inline__ ssize_t tun_get_user(struct tun_struct *tun,
                 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);
@@ -726,6 +729,8 @@ static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
                                 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
                                 BUG();
                         if (sinfo->gso_type & SKB_GSO_TCP_ECN)
@@ -1073,7 +1078,8 @@ static int set_offload(struct net_device *dev, unsigned long arg)
         old_features = dev->features;
         /* Unset features, set them as we chew on the arg. */
         features = (old_features & ~(NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST
-                                    |NETIF_F_TSO_ECN|NETIF_F_TSO|NETIF_F_TSO6));
+                                    |NETIF_F_TSO_ECN|NETIF_F_TSO|NETIF_F_TSO6
+                                    |NETIF_F_UFO));
 
         if (arg & TUN_F_CSUM) {
                 features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
@@ -1090,6 +1096,11 @@ static int set_offload(struct net_device *dev, unsigned long arg)
                                 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
diff --git a/include/linux/if_tun.h b/include/linux/if_tun.h
index 915ba5789f0e..3f5fd523b49d 100644
--- a/include/linux/if_tun.h
+++ b/include/linux/if_tun.h
@@ -62,6 +62,7 @@
 #define TUN_F_TSO4      0x02    /* I can handle TSO for IPv4 packets */
 #define TUN_F_TSO6      0x04    /* I can handle TSO for IPv6 packets */
 #define TUN_F_TSO_ECN   0x08    /* I can handle TSO with ECN bits. */
+#define TUN_F_UFO       0x10    /* I can handle UFO packets */
 
 /* Protocol info prepended to the packets (when IFF_NO_PI is not set) */
 #define TUN_PKT_STRIP   0x0001