flow_dissector: add support for IPPROTO_IPV6

Support IPPROTO_IPV6 similar to IPPROTO_IPIP
Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/flow_dissector.c

@@ -141,6 +141,9 @@ bool skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow)
 	case IPPROTO_IPIP:
 		proto = htons(ETH_P_IP);
 		goto ip;
+	case IPPROTO_IPV6:
+		proto = htons(ETH_P_IPV6);
+		goto ipv6;
 	default:
 		break;
 	}