1 files changed, 16 insertions, 9 deletions

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 186ce541c657..7302398f0b1f 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -65,6 +65,7 @@
 #include <linux/nsproxy.h>
 #include <linux/virtio_net.h>
 #include <linux/rcupdate.h>
+#include <net/ipv6.h>
 #include <net/net_namespace.h>
 #include <net/netns/generic.h>
 #include <net/rtnetlink.h>
@@ -174,7 +175,7 @@ struct tun_struct {
         struct net_device       *dev;
         netdev_features_t       set_features;
 #define TUN_USER_FEATURES (NETIF_F_HW_CSUM|NETIF_F_TSO_ECN|NETIF_F_TSO| \
-                          NETIF_F_TSO6|NETIF_F_UFO)
+                          NETIF_F_TSO6)
 
         int                     vnet_hdr_sz;
         int                     sndbuf;
@@ -1139,6 +1140,8 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
                 break;
         }
 
+        skb_reset_network_header(skb);
+
         if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
                 pr_debug("GSO!\n");
                 switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
@@ -1149,8 +1152,20 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
                         skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
                         break;
                 case VIRTIO_NET_HDR_GSO_UDP:
+                {
+                        static bool warned;
+
+                        if (!warned) {
+                                warned = true;
+                                netdev_warn(tun->dev,
+                                            "%s: using disabled UFO feature; please fix this program\n",
+                                            current->comm);
+                        }
                         skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
+                        if (skb->protocol == htons(ETH_P_IPV6))
+                                ipv6_proxy_select_ident(skb);
                         break;
+                }
                 default:
                         tun->dev->stats.rx_frame_errors++;
                         kfree_skb(skb);
@@ -1179,7 +1194,6 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
                 skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG;
         }
 
-        skb_reset_network_header(skb);
         skb_probe_transport_header(skb, 0);
 
         rxhash = skb_get_hash(skb);
@@ -1251,8 +1265,6 @@ static 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 {
                                 pr_err("unexpected GSO type: "
                                        "0x%x, gso_size %d, hdr_len %d\n",
@@ -1762,11 +1774,6 @@ static int set_offload(struct tun_struct *tun, 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