enum {	IPaddrlen=	16,	IPv4addrlen=	4,	IPv4off=	12,}; uchar*	defmask(uchar*);void	maskip(uchar*, uchar*, uchar*);int	eipfmt(Fmt*);int	isv4(uchar*);vlong	parseip(uchar*, char*);vlong	parseipmask(uchar*, char*);char*	v4parseip(uchar*, char*);char*	v4parsecidr(uchar*, uchar*, char*); void	hnputv(void*, uvlong);void	hnputl(void*, uint);void	hnputs(void*, ushort);uvlong	nhgetv(void*);uint	nhgetl(void*);ushort	nhgets(void*); int	v6tov4(uchar*, uchar*);void	v4tov6(uchar*, uchar*); #define	ipcmp(x, y) memcmp(x, y, IPaddrlen)#define	ipmove(x, y) memmove(x, y, IPaddrlen) extern uchar IPv4bcast[IPaddrlen];extern uchar IPv4bcastobs[IPaddrlen];extern uchar IPv4allsys[IPaddrlen];extern uchar IPv4allrouter[IPaddrlen];extern uchar IPnoaddr[IPaddrlen];extern uchar v4prefix[IPaddrlen];extern uchar IPallbits[IPaddrlen]; #define CLASS(p) ((*(uchar*)(p))>>6)