[PATCH v3 net-next 1/4] flow_keys: include thoff into flow_keys for later usage

[Daniel Borkmann <dborkman@redhat.com>]

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>
---
 This patch also needs to go into the net tree, since Eric or Jason will
 post a bug fix on top of this one.

 include/net/flow_keys.h   | 1 +
 net/core/flow_dissector.c | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/include/net/flow_keys.h b/include/net/flow_keys.h
index 80461c1..bb8271d 100644
--- 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
index f8d9e03..f4be293 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -151,6 +151,8 @@ ipv6:
 			flow->ports = *ports;
 	}
 
+	flow->thoff = (u16) nhoff;
+
 	return true;
 }
 EXPORT_SYMBOL(skb_flow_dissect);
-- 
1.7.11.7