setkeymsg_add
static int setkeymsg_add(unsigned int, unsigned int,
status = setkeymsg_add(SADB_ADD, $5, $3, $4);
status = setkeymsg_add(SADB_UPDATE, $5, $3, $4);
status = setkeymsg_add(SADB_GETSPI, $5, $3, $4);