gro: Fix COMPLETE checksum handling

On a brand new GRO skb, we cannot call ip_hdr since the header
may lie in the non-linear area.  This patch adds the helper
skb_gro_network_header to handle this.

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

1 files changed, 7 insertions, 0 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index c9ef41916071..fe20d171acf1 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1142,6 +1142,13 @@ static inline void *skb_gro_mac_header(struct sk_buff *skb)
                skb_shinfo(skb)->frags[0].page_offset;
 }
 
+static inline void *skb_gro_network_header(struct sk_buff *skb)
+{
+        return skb_headlen(skb) ? skb_network_header(skb) :
+               page_address(skb_shinfo(skb)->frags[0].page) +
+               skb_shinfo(skb)->frags[0].page_offset + skb_network_offset(skb);
+}
+
 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
                                   unsigned short type,
                                   const void *daddr, const void *saddr,