[NET] gso: Fix up GSO packets with broken checksums

Certain subsystems in the stack (e.g., netfilter) can break the partial
checksum on GSO packets.  Until they're fixed, this patch allows this to
work by recomputing the partial checksums through the GSO mechanism.

Once they've all been converted to update the partial checksum instead of
clearing it, this workaround can be removed.

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

1 files changed, 5 insertions, 3 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 0359a6430018..76cc099c8580 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -549,6 +549,7 @@ struct packet_type {
                                          struct net_device *);
         struct sk_buff          *(*gso_segment)(struct sk_buff *skb,
                                                 int features);
+        int                     (*gso_send_check)(struct sk_buff *skb);
         void                    *af_packet_priv;
         struct list_head        list;
 };
@@ -1001,13 +1002,14 @@ static inline int net_gso_ok(int features, int gso_type)
 
 static inline int skb_gso_ok(struct sk_buff *skb, int features)
 {
-        return net_gso_ok(features, skb_is_gso(skb) ?
-                                    skb_shinfo(skb)->gso_type : 0);
+        return net_gso_ok(features, skb_shinfo(skb)->gso_type);
 }
 
 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
 {
-        return !skb_gso_ok(skb, dev->features);
+        return skb_is_gso(skb) &&
+               (!skb_gso_ok(skb, dev->features) ||
+                unlikely(skb->ip_summed != CHECKSUM_HW));
 }
 
 #endif /* __KERNEL__ */