ip.h

#ifndef _NETINET_IP_H
#define _NETINET_IP_H

#ifdef __cplusplus
extern "C" {
#endif

#include <stdint.h>
#include <netinet/in.h>
#include <endian.h>

struct timestamp {
	uint8_t len;
	uint8_t ptr;
#if __BYTE_ORDER == __LITTLE_ENDIAN
	unsigned int flags:4;
	unsigned int overflow:4;
#else
	unsigned int overflow:4;
	unsigned int flags:4;
#endif
	uint32_t data[9];
  };

struct iphdr {
#if __BYTE_ORDER == __LITTLE_ENDIAN
	unsigned int ihl:4;
	unsigned int version:4;
#else
	unsigned int version:4;
	unsigned int 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;
};

struct ip {
#if __BYTE_ORDER == __LITTLE_ENDIAN
	unsigned int ip_hl:4;
	unsigned int ip_v:4;
#else
	unsigned int ip_v:4;
	unsigned int ip_hl:4;
#endif
	uint8_t ip_tos;
	uint16_t ip_len;
	uint16_t ip_id;
	uint16_t ip_off;
	uint8_t ip_ttl;
	uint8_t ip_p;
	uint16_t ip_sum;
	struct in_addr ip_src, ip_dst;
};

#define	IP_RF 0x8000
#define	IP_DF 0x4000
#define	IP_MF 0x2000
#define	IP_OFFMASK 0x1fff

struct ip_timestamp {
	uint8_t ipt_code;
	uint8_t ipt_len;
	uint8_t ipt_ptr;
#if __BYTE_ORDER == __LITTLE_ENDIAN
	unsigned int ipt_flg:4;
	unsigned int ipt_oflw:4;
#else
	unsigned int ipt_oflw:4;
	unsigned int ipt_flg:4;
#endif
	uint32_t data[9];
};

#define	IPVERSION	4
#define	IP_MAXPACKET	65535

#define	IPTOS_ECN_MASK		0x03
#define	IPTOS_ECN(x)		((x) & IPTOS_ECN_MASK)
#define	IPTOS_ECN_NOT_ECT	0x00
#define	IPTOS_ECN_ECT1		0x01
#define	IPTOS_ECN_ECT0		0x02
#define	IPTOS_ECN_CE		0x03

#define	IPTOS_DSCP_MASK		0xfc
#define	IPTOS_DSCP(x)		((x) & IPTOS_DSCP_MASK)
#define	IPTOS_DSCP_AF11		0x28
#define	IPTOS_DSCP_AF12		0x30
#define	IPTOS_DSCP_AF13		0x38
#define	IPTOS_DSCP_AF21		0x48
#define	IPTOS_DSCP_AF22		0x50
#define	IPTOS_DSCP_AF23		0x58
#define	IPTOS_DSCP_AF31		0x68
#define	IPTOS_DSCP_AF32		0x70
#define	IPTOS_DSCP_AF33		0x78
#define	IPTOS_DSCP_AF41		0x88
#define	IPTOS_DSCP_AF42		0x90
#define	IPTOS_DSCP_AF43		0x98
#define	IPTOS_DSCP_EF		0xb8

#define	IPTOS_CLASS_MASK	0xe0
#define	IPTOS_CLASS(x)		((x) & IPTOS_CLASS_MASK)
#define	IPTOS_CLASS_CS0		0x00
#define	IPTOS_CLASS_CS1		0x20
#define	IPTOS_CLASS_CS2		0x40
#define	IPTOS_CLASS_CS3		0x60
#define	IPTOS_CLASS_CS4		0x80
#define	IPTOS_CLASS_CS5		0xa0
#define	IPTOS_CLASS_CS6		0xc0
#define	IPTOS_CLASS_CS7		0xe0
#define	IPTOS_CLASS_DEFAULT	IPTOS_CLASS_CS0

#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_LOWCOST		0x02
#define	IPTOS_MINCOST		IPTOS_LOWCOST

#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

#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_DEBMEAS		0x40
#define	IPOPT_MEASUREMENT       IPOPT_DEBMEAS
#define	IPOPT_RESERVED2		0x60

#define	IPOPT_EOL		0
#define	IPOPT_END		IPOPT_EOL
#define	IPOPT_NOP		1
#define	IPOPT_NOOP		IPOPT_NOP

#define	IPOPT_RR		7
#define	IPOPT_TS		68
#define	IPOPT_TIMESTAMP		IPOPT_TS
#define	IPOPT_SECURITY		130
#define	IPOPT_SEC		IPOPT_SECURITY
#define	IPOPT_LSRR		131
#define	IPOPT_SATID		136
#define	IPOPT_SID		IPOPT_SATID
#define	IPOPT_SSRR		137
#define	IPOPT_RA		148

#define	IPOPT_OPTVAL		0
#define	IPOPT_OLEN		1
#define	IPOPT_OFFSET		2
#define	IPOPT_MINOFF		4

#define	MAX_IPOPTLEN		40

#define	IPOPT_TS_TSONLY		0
#define	IPOPT_TS_TSANDADDR	1
#define	IPOPT_TS_PRESPEC	3

#define	IPOPT_SECUR_UNCLASS	0x0000
#define	IPOPT_SECUR_CONFID	0xf135
#define	IPOPT_SECUR_EFTO	0x789a
#define	IPOPT_SECUR_MMMM	0xbc4d
#define	IPOPT_SECUR_RESTR	0xaf13
#define	IPOPT_SECUR_SECRET	0xd788
#define	IPOPT_SECUR_TOPSECRET	0x6bc5

#define	MAXTTL		255
#define	IPDEFTTL	64
#define	IPFRAGTTL	60
#define	IPTTLDEC	1

#define	IP_MSS		576

#ifdef __cplusplus
}
#endif

#endif