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