MAC_RULE_STRING_LEN
static char rule_string[MAC_RULE_STRING_LEN];
new_string = malloc(MAC_RULE_STRING_LEN, M_IPACL,
error = sysctl_handle_string(oidp, string, MAC_RULE_STRING_LEN, req);
static char rule_string[MAC_RULE_STRING_LEN];
new_string = malloc(MAC_RULE_STRING_LEN, M_PORTACL,
error = sysctl_handle_string(oidp, string, MAC_RULE_STRING_LEN, req);