geticmpcodebyname
if ((p = geticmpcodebyname($1-1, $3, AF_INET)) == NULL) {
if ((p = geticmpcodebyname($1-1, $3, AF_INET6)) == NULL) {
if ((p = geticmpcodebyname(icmptype, w, af)) == NULL) {
const struct icmpcodeent *geticmpcodebyname(u_long, char *, u_int8_t);