flow_dissector: Dissect tos and ttl from the tunnel info

Add dissection of the tos and ttl from the ip tunnel headers
fields in case a match is needed on them.
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/flow_dissector.h

@@ -207,7 +207,7 @@ enum flow_dissector_key_id {
 	FLOW_DISSECTOR_KEY_TCP, /* struct flow_dissector_key_tcp */
 	FLOW_DISSECTOR_KEY_IP, /* struct flow_dissector_key_ip */
 	FLOW_DISSECTOR_KEY_CVLAN, /* struct flow_dissector_key_flow_vlan */
-
+	FLOW_DISSECTOR_KEY_ENC_IP, /* struct flow_dissector_key_ip */
 	FLOW_DISSECTOR_KEY_MAX,
 };
 

net/core/flow_dissector.c

@@ -152,7 +152,9 @@ skb_flow_dissect_tunnel_info(const struct sk_buff *skb,
 	    !dissector_uses_key(flow_dissector,
 				FLOW_DISSECTOR_KEY_ENC_CONTROL) &&
 	    !dissector_uses_key(flow_dissector,
-				FLOW_DISSECTOR_KEY_ENC_PORTS))
+				FLOW_DISSECTOR_KEY_ENC_PORTS) &&
+	    !dissector_uses_key(flow_dissector,
+				FLOW_DISSECTOR_KEY_ENC_IP))
 		return;
 
 	info = skb_tunnel_info(skb);
@@ -212,6 +214,16 @@ skb_flow_dissect_tunnel_info(const struct sk_buff *skb,
 		tp->src = key->tp_src;
 		tp->dst = key->tp_dst;
 	}
+
+	if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_IP)) {
+		struct flow_dissector_key_ip *ip;
+
+		ip = skb_flow_dissector_target(flow_dissector,
+					       FLOW_DISSECTOR_KEY_ENC_IP,
+					       target_container);
+		ip->tos = key->tos;
+		ip->ttl = key->ttl;
+	}
 }
 EXPORT_SYMBOL(skb_flow_dissect_tunnel_info);