/* * INET		An implementation of the TCP/IP protocol suite for the LINUX *		operating system.  INET is implemented using the  BSD Socket *		interface as the means of communication with the user level. * *		Definitions of the Internet Protocol. * * Version:	@(#)in.h	1.0.1	04/21/93 * * Authors:	Original taken from the GNU Project <netinet/in.h> file. *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> * *		This program is free software; you can redistribute it and/or *		modify it under the terms of the GNU General Public License *		as published by the Free Software Foundation; either version *		2 of the License, or (at your option) any later version. */#ifndef _LINUX_IN_H#define _LINUX_IN_H/* Standard well-defined IP protocols.  */enum {  IPPROTO_IP = 0,		/* Dummy protocol for TCP		*/  IPPROTO_ICMP = 1,		/* Internet Control Message Protocol	*/  IPPROTO_GGP = 2,		/* Gateway Protocol (deprecated)	*/  IPPROTO_TCP = 6,		/* Transmission Control Protocol	*/  IPPROTO_EGP = 8,		/* Exterior Gateway Protocol		*/  IPPROTO_PUP = 12,		/* PUP protocol				*/  IPPROTO_UDP = 17,		/* User Datagram Protocol		*/  IPPROTO_IDP = 22,		/* XNS IDP protocol			*/  IPPROTO_RAW = 255,		/* Raw IP packets			*/  IPPROTO_MAX};/* Internet address. */struct in_addr {	unsigned long int	s_addr;};/* Structure describing an Internet (IP) socket address. */#define __SOCK_SIZE__	16		/* sizeof(struct sockaddr)	*/struct sockaddr_in {  short int		sin_family;	/* Address family		*/  unsigned short int	sin_port;	/* Port number			*/  struct in_addr	sin_addr;	/* Internet address		*/  /* Pad to size of `struct sockaddr'. */  unsigned char		__pad[__SOCK_SIZE__ - sizeof(short int) -			sizeof(unsigned short int) - sizeof(struct in_addr)];};#define sin_zero	__pad		/* for BSD UNIX comp. -FvK	*//* * Definitions of the bits in an Internet address integer. * On subnets, host and network parts are found according * to the subnet mask, not these masks. */#define	IN_CLASSA(a)		((((long int) (a)) & 0x80000000) == 0)#define	IN_CLASSA_NET		0xff000000#define	IN_CLASSA_NSHIFT	24#define	IN_CLASSA_HOST		(0xffffffff & ~IN_CLASSA_NET)#define	IN_CLASSA_MAX		128#define	IN_CLASSB(a)		((((long int) (a)) & 0xc0000000) == 0x80000000)#define	IN_CLASSB_NET		0xffff0000#define	IN_CLASSB_NSHIFT	16#define	IN_CLASSB_HOST		(0xffffffff & ~IN_CLASSB_NET)#define	IN_CLASSB_MAX		65536#define	IN_CLASSC(a)		((((long int) (a)) & 0xc0000000) == 0xc0000000)#define	IN_CLASSC_NET		0xffffff00#define	IN_CLASSC_NSHIFT	8#define	IN_CLASSC_HOST		(0xffffffff & ~IN_CLASSC_NET)#define	IN_CLASSD(a)		((((long int) (a)) & 0xf0000000) == 0xe0000000)#define	IN_MULTICAST(a)		IN_CLASSD(a)#define	IN_EXPERIMENTAL(a)	((((long int) (a)) & 0xe0000000) == 0xe0000000)#define	IN_BADCLASS(a)		((((long int) (a)) & 0xf0000000) == 0xf0000000)/* Address to accept any incoming messages. */#define	INADDR_ANY		((unsigned long int) 0x00000000)/* Address to send to all hosts. */#define	INADDR_BROADCAST	((unsigned long int) 0xffffffff)/* Address indicating an error return. */#define	INADDR_NONE		0xffffffff/* Network number for local host loopback. */#define	IN_LOOPBACKNET		127/* Address to loopback in software to local host.  */#define	INADDR_LOOPBACK		0x7f000001	/* 127.0.0.1		*//* * Options for use with `getsockopt' and `setsockopt' at * the IP level.  LINUX does not yet have the IP_OPTIONS * option (grin), so we undefine it for now.- HJ && FvK */#if 0# define IP_OPTIONS	1		/* IP per-packet options	*/#endif#define IP_HDRINCL	2		/* raw packet header option	*//* Linux Internet number representation function declarations. */#undef ntohl#undef ntohs#undef htonl#undef htonsextern unsigned long int	ntohl(unsigned long int);extern unsigned short int	ntohs(unsigned short int);extern unsigned long int	htonl(unsigned long int);extern unsigned short int	htons(unsigned short int);static __inline__ unsigned long int__ntohl(unsigned long int x){	__asm__("xchgb %b0,%h0\n\t"	/* swap lower bytes	*/		"rorl $16,%0\n\t"	/* swap words		*/		"xchgb %b0,%h0"		/* swap higher bytes	*/		:"=q" (x)		: "0" (x));	return x;}static __inline__ unsigned long int__constant_ntohl(unsigned long int x){	return (((x & 0x000000ff) << 24) |		((x & 0x0000ff00) <<  8) |		((x & 0x00ff0000) >>  8) |		((x & 0xff000000) >> 24));}static __inline__ unsigned short int__ntohs(unsigned short int x){	__asm__("xchgb %b0,%h0"		/* swap bytes		*/		: "=q" (x)		:  "0" (x));	return x;}static __inline__ unsigned short int__constant_ntohs(unsigned short int x){	return (((x & 0x00ff) << 8) |		((x & 0xff00) >> 8));}#define __htonl(x) __ntohl(x)#define __htons(x) __ntohs(x)#define __constant_htonl(x) __constant_ntohl(x)#define __constant_htons(x) __constant_ntohs(x)#ifdef  __OPTIMIZE__#  define ntohl(x) \(__builtin_constant_p((x)) ? \ __constant_ntohl((x)) : \ __ntohl((x)))#  define ntohs(x) \(__builtin_constant_p((x)) ? \ __constant_ntohs((x)) : \ __ntohs((x)))#  define htonl(x) \(__builtin_constant_p((x)) ? \ __constant_htonl((x)) : \ __htonl((x)))#  define htons(x) \(__builtin_constant_p((x)) ? \ __constant_htons((x)) : \ __htons((x)))#endif#endif	/* _LINUX_IN_H */