update icmphdr struct following linux v4.8

add union field that is used in the kernel for SIT/GRE tunneling ICMPv4
messages. see linux commit 20e1954fe238dbe5f8d3a979e593fe352bd703cf

diff --git a/include/netinet/ip_icmp.h b/include/netinet/ip_icmp.h
index 2f4a86ddd4cf2c53c6fe111c30946f62083d5075..b9e0df8997e145726e1c0eef5768c52c5c69fb97 100644 (file)
--- a/include/netinet/ip_icmp.h
+++ b/include/netinet/ip_icmp.h
@@ -23,6 +23,7 @@ struct icmphdr {
                        uint16_t __unused;
                        uint16_t mtu;
                } frag;
+               uint8_t reserved[4];
        } un;
 };