ipv4: support sport, dport and ip_proto in RTM_GETROUTE

This is a followup to fib rules sport, dport and ipproto
match support. Only supports tcp, udp and icmp for ipproto.
Used by fib rule self tests.

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/uapi/linux/rtnetlink.h

@@ -327,6 +327,9 @@ enum rtattr_type_t {
 	RTA_PAD,
 	RTA_UID,
 	RTA_TTL_PROPAGATE,
+	RTA_IP_PROTO,
+	RTA_SPORT,
+	RTA_DPORT,
 	__RTA_MAX
 };