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>

diff --git a/include/net/flow_keys.h b/include/net/flow_keys.h
index 80461c1..bb8271d 100644 (file)
--- 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 9d4c720..e187bf0 100644 (file)
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -140,6 +140,8 @@ ipv6:
                        flow->ports = *ports;
        }
 
+       flow->thoff = (u16) nhoff;
+
        return true;
 }
 EXPORT_SYMBOL(skb_flow_dissect);