[NET]: Added GSO header verification

When GSO packets come from an untrusted source (e.g., a Xen guest domain),
we need to verify the header integrity before passing it to the hardware.

Since the first step in GSO is to verify the header, we can reuse that
code by adding a new bit to gso_type: SKB_GSO_DODGY.  Packets with this
bit set can only be fed directly to devices with the corresponding bit
NETIF_F_GSO_ROBUST.  If the device doesn't have that bit, then the skb
is fed to the GSO engine which will allow the packet to be sent to the
hardware if it passes the header check.

This patch changes the sg flag to a full features flag.  The same method
can be used to implement TSO ECN support.  We simply have to mark packets
with CWR set with SKB_GSO_ECN so that only hardware with a corresponding
NETIF_F_TSO_ECN can accept them.  The GSO engine can either fully segment
the packet, or segment the first MTU and pass the rest to the hardware for
further segmentation.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 4 insertions, 3 deletions

diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index 2afdc7c0736c..f8dbcee80eba 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -184,6 +184,6 @@ void br_dev_setup(struct net_device *dev)
         dev->set_mac_address = br_set_mac_address;
         dev->priv_flags = IFF_EBRIDGE;
 
-        dev->features = NETIF_F_SG | NETIF_F_FRAGLIST
-                | NETIF_F_HIGHDMA | NETIF_F_TSO | NETIF_F_NO_CSUM;
+        dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
+                        NETIF_F_TSO | NETIF_F_NO_CSUM | NETIF_F_GSO_ROBUST;
 }
diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index 07956ecf545e..f55ef682ef84 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -392,7 +392,8 @@ void br_features_recompute(struct net_bridge *br)
                 features &= feature;
         }
 
-        br->dev->features = features | checksum | NETIF_F_LLTX;
+        br->dev->features = features | checksum | NETIF_F_LLTX |
+                            NETIF_F_GSO_ROBUST;
 }
 
 /* called with RTNL */