4 files changed, 10 insertions, 3 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 37247901ebd2..1c19b2d55c2b 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1654,5 +1654,12 @@ static inline int skb_is_gso(const struct sk_buff *skb)
         return skb_shinfo(skb)->gso_size;
 }
 
+static inline void skb_forward_csum(struct sk_buff *skb)
+{
+        /* Unfortunately we don't support this one.  Any brave souls? */
+        if (skb->ip_summed == CHECKSUM_COMPLETE)
+                skb->ip_summed = CHECKSUM_NONE;
+}
+
 #endif  /* __KERNEL__ */
 #endif  /* _LINUX_SKBUFF_H */
diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c
index 3e45c1a1aa96..ada7f495445c 100644
--- a/net/bridge/br_forward.c
+++ b/net/bridge/br_forward.c
@@ -71,7 +71,7 @@ static void __br_forward(const struct net_bridge_port *to, struct sk_buff *skb)
 
         indev = skb->dev;
         skb->dev = to->dev;
-        skb->ip_summed = CHECKSUM_NONE;
+        skb_forward_csum(skb);
 
         NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, indev, skb->dev,
                         br_forward_finish);
diff --git a/net/ipv4/ip_forward.c b/net/ipv4/ip_forward.c
index 61b30d100676..9cb04df0054b 100644
--- a/net/ipv4/ip_forward.c
+++ b/net/ipv4/ip_forward.c
@@ -67,7 +67,7 @@ int ip_forward(struct sk_buff *skb)
         if (skb->pkt_type != PACKET_HOST)
                 goto drop;
 
-        skb->ip_summed = CHECKSUM_NONE;
+        skb_forward_csum(skb);
 
         /*
          *      According to the RFC, we must first decrease the TTL field. If
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index e2b8db6b9aef..be3f082a87ed 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -378,7 +378,7 @@ int ip6_forward(struct sk_buff *skb)
                 goto drop;
         }
 
-        skb->ip_summed = CHECKSUM_NONE;
+        skb_forward_csum(skb);
 
         /*
          *      We DO NOT make any processing on