#ifndef _LIBXTC_H#define _LIBXTC_H/* Library which manipulates filtering rules. */#include <libiptc/ipt_kernel_headers.h>#include <linux/netfilter/x_tables.h>#ifdef __cplusplusextern "C" {#endif#ifndef XT_MIN_ALIGN/* xt_entry has pointers and u_int64_t's in it, so if you align to   it, you'll also align to any crazy matches and targets someone   might write */#define XT_MIN_ALIGN (__alignof__(struct xt_entry))#endif#ifndef XT_ALIGN#define XT_ALIGN(s) (((s) + ((XT_MIN_ALIGN)-1)) & ~((XT_MIN_ALIGN)-1))#endiftypedef char xt_chainlabel[32];#define XTC_LABEL_ACCEPT  "ACCEPT"#define XTC_LABEL_DROP    "DROP"#define XTC_LABEL_QUEUE   "QUEUE"#define XTC_LABEL_RETURN  "RETURN"#ifdef __cplusplus}#endif#endif /* _LIBXTC_H */