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/*
* 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 for the IP protocol.
*
* Version: @(#)ip.h 1.0.2 04/28/93
*
* Authors: 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_IP_H
#define _LINUX_IP_H
#include <endian.h>
#include <byteswap.h>
#include <linux/types.h>
/* SOL_IP socket options */
#define IPTOS_TOS_MASK 0x1E
#define IPTOS_TOS(tos) ((tos)&IPTOS_TOS_MASK)
#define IPTOS_LOWDELAY 0x10
#define IPTOS_THROUGHPUT 0x08
#define IPTOS_RELIABILITY 0x04
#define IPTOS_MINCOST 0x02
#define IPTOS_PREC_MASK 0xE0
#define IPTOS_PREC(tos) ((tos)&IPTOS_PREC_MASK)
#define IPTOS_PREC_NETCONTROL 0xe0
#define IPTOS_PREC_INTERNETCONTROL 0xc0
#define IPTOS_PREC_CRITIC_ECP 0xa0
#define IPTOS_PREC_FLASHOVERRIDE 0x80
#define IPTOS_PREC_FLASH 0x60
#define IPTOS_PREC_IMMEDIATE 0x40
#define IPTOS_PREC_PRIORITY 0x20
#define IPTOS_PREC_ROUTINE 0x00
/* IP options */
#define IPOPT_COPY 0x80
#define IPOPT_CLASS_MASK 0x60
#define IPOPT_NUMBER_MASK 0x1f
#define IPOPT_COPIED(o) ((o)&IPOPT_COPY)
#define IPOPT_CLASS(o) ((o)&IPOPT_CLASS_MASK)
#define IPOPT_NUMBER(o) ((o)&IPOPT_NUMBER_MASK)
#define IPOPT_CONTROL 0x00
#define IPOPT_RESERVED1 0x20
#define IPOPT_MEASUREMENT 0x40
#define IPOPT_RESERVED2 0x60
#define IPOPT_END (0 |IPOPT_CONTROL)
#define IPOPT_NOOP (1 |IPOPT_CONTROL)
#define IPOPT_SEC (2 |IPOPT_CONTROL|IPOPT_COPY)
#define IPOPT_LSRR (3 |IPOPT_CONTROL|IPOPT_COPY)
#define IPOPT_TIMESTAMP (4 |IPOPT_MEASUREMENT)
#define IPOPT_RR (7 |IPOPT_CONTROL)
#define IPOPT_SID (8 |IPOPT_CONTROL|IPOPT_COPY)
#define IPOPT_SSRR (9 |IPOPT_CONTROL|IPOPT_COPY)
#define IPOPT_RA (20|IPOPT_CONTROL|IPOPT_COPY)
#define IPVERSION 4
#define MAXTTL 255
#define IPDEFTTL 64
/* struct timestamp, struct route and MAX_ROUTES are removed.
REASONS: it is clear that nobody used them because:
- MAX_ROUTES value was wrong.
- "struct route" was wrong.
- "struct timestamp" had fatally misaligned bitfields and was completely unusable.
*/
#define IPOPT_OPTVAL 0
#define IPOPT_OLEN 1
#define IPOPT_OFFSET 2
#define IPOPT_MINOFF 4
#define MAX_IPOPTLEN 40
#define IPOPT_NOP IPOPT_NOOP
#define IPOPT_EOL IPOPT_END
#define IPOPT_TS IPOPT_TIMESTAMP
#define IPOPT_TS_TSONLY 0 /* timestamps only */
#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
#define IPOPT_TS_PRESPEC 3 /* specified modules only */
struct iphdr {
#if __BYTE_ORDER == __LITTLE_ENDIAN
uint8_t ihl:4,
version:4;
#elif __BYTE_ORDER == __BIG_ENDIAN
uint8_t version:4,
ihl:4;
#endif
uint8_t tos;
uint16_t tot_len;
uint16_t id;
uint16_t frag_off;
uint8_t ttl;
uint8_t protocol;
uint16_t check;
uint32_t saddr;
uint32_t daddr;
/*The options start here. */
};
#endif /* _LINUX_IP_H */