#pragma	src	"/sys/src/libip"#pragma	lib	"libip.a" enum {	IPaddrlen=	16,	IPv4addrlen=	4,	IPv4off=	12,	IPllen=		4,}; /* *  for reading /net/ipifc */typedef struct Ipifc Ipifc;typedef struct Ipifcs Ipifcs; struct Ipifc{	char	dev[64];	uchar	ip[IPaddrlen];	uchar	mask[IPaddrlen];	uchar	net[IPaddrlen];		/* ip & mask */	Ipifc	*next;}; struct Ipifcs{	Ipifc *first;	Ipifc *last;}; /* *  user level udp headers */enum {	Udphdrsize=	36,	/* size of a Udphdr */}; typedef struct Udphdr Udphdr;struct Udphdr{	uchar	raddr[IPaddrlen];	/* remote address and port */	uchar	laddr[IPaddrlen];	/* local address and port */	uchar	rport[2];	uchar	lport[2];}; uchar*	defmask(uchar*);void	maskip(uchar*, uchar*, uchar*);int	eipconv(va_list*, Fconv*);ulong	parseip(uchar*, char*);ulong	parseipmask(uchar*, char*);int	parseether(uchar*, char*);int	myipaddr(uchar*, char*);int	myetheraddr(uchar*, char*); void	readipifc(char*, Ipifcs*); void	hnputl(void*, uint);void	hnputs(void*, ushort);uint	nhgetl(void*);ushort	nhgets(void*); #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)