flow_keys: include thoff into flow_keys for later usage

In skb_flow_dissect(), we perform a dissection of a skbuff. Since we're doing the work here anyway, also store thoff for a later usage, e.g. in the BPF filter. Suggested-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
git-mirror · Mar 20, 2013 · 8ed7816 · 8ed7816
1 parent e0ebcb8
commit 8ed7816
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diff --git a/include/net/flow_keys.h b/include/net/flow_keys.h
@@ -9,6 +9,7 @@ struct flow_keys {
 		__be32 ports;
 		__be16 port16[2];
 	};
+	u16 thoff;
 	u8 ip_proto;
 };
 

diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
@@ -140,6 +140,8 @@ bool skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow)
 			flow->ports = *ports;
 	}
 
+	flow->thoff = (u16) nhoff;
+
 	return true;
 }
 EXPORT_SYMBOL(skb_flow_dissect);