1/*
2 * INET		An implementation of the TCP/IP protocol suite for the LINUX
3 *		operating system.  INET is implemented using the  BSD Socket
4 *		interface as the means of communication with the user level.
5 *
6 *		Definitions for the IP protocol.
7 *
8 * Version:	@(#)ip.h	1.0.2	04/28/93
9 *
10 * Authors:	Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
11 *
12 *		This program is free software; you can redistribute it and/or
13 *		modify it under the terms of the GNU General Public License
14 *		as published by the Free Software Foundation; either version
15 *		2 of the License, or (at your option) any later version.
16 */
17#ifndef _LINUX_IP_H
18#define _LINUX_IP_H
19#include <linux/types.h>
20#include <asm/byteorder.h>
21
22#define IPTOS_TOS_MASK		0x1E
23#define IPTOS_TOS(tos)		((tos)&IPTOS_TOS_MASK)
24#define	IPTOS_LOWDELAY		0x10
25#define	IPTOS_THROUGHPUT	0x08
26#define	IPTOS_RELIABILITY	0x04
27#define	IPTOS_MINCOST		0x02
28
29#define IPTOS_PREC_MASK		0xE0
30#define IPTOS_PREC(tos)		((tos)&IPTOS_PREC_MASK)
31#define IPTOS_PREC_NETCONTROL           0xe0
32#define IPTOS_PREC_INTERNETCONTROL      0xc0
33#define IPTOS_PREC_CRITIC_ECP           0xa0
34#define IPTOS_PREC_FLASHOVERRIDE        0x80
35#define IPTOS_PREC_FLASH                0x60
36#define IPTOS_PREC_IMMEDIATE            0x40
37#define IPTOS_PREC_PRIORITY             0x20
38#define IPTOS_PREC_ROUTINE              0x00
39
40
41/* IP options */
42#define IPOPT_COPY		0x80
43#define IPOPT_CLASS_MASK	0x60
44#define IPOPT_NUMBER_MASK	0x1f
45
46#define	IPOPT_COPIED(o)		((o)&IPOPT_COPY)
47#define	IPOPT_CLASS(o)		((o)&IPOPT_CLASS_MASK)
48#define	IPOPT_NUMBER(o)		((o)&IPOPT_NUMBER_MASK)
49
50#define	IPOPT_CONTROL		0x00
51#define	IPOPT_RESERVED1		0x20
52#define	IPOPT_MEASUREMENT	0x40
53#define	IPOPT_RESERVED2		0x60
54
55#define IPOPT_END	(0 |IPOPT_CONTROL)
56#define IPOPT_NOOP	(1 |IPOPT_CONTROL)
57#define IPOPT_SEC	(2 |IPOPT_CONTROL|IPOPT_COPY)
58#define IPOPT_LSRR	(3 |IPOPT_CONTROL|IPOPT_COPY)
59#define IPOPT_TIMESTAMP	(4 |IPOPT_MEASUREMENT)
60#define IPOPT_RR	(7 |IPOPT_CONTROL)
61#define IPOPT_SID	(8 |IPOPT_CONTROL|IPOPT_COPY)
62#define IPOPT_SSRR	(9 |IPOPT_CONTROL|IPOPT_COPY)
63#define IPOPT_RA	(20|IPOPT_CONTROL|IPOPT_COPY)
64
65#define IPVERSION	4
66#define MAXTTL		255
67#define IPDEFTTL	64
68
69#define IPOPT_OPTVAL 0
70#define IPOPT_OLEN   1
71#define IPOPT_OFFSET 2
72#define IPOPT_MINOFF 4
73#define MAX_IPOPTLEN 40
74#define IPOPT_NOP IPOPT_NOOP
75#define IPOPT_EOL IPOPT_END
76#define IPOPT_TS  IPOPT_TIMESTAMP
77
78#define	IPOPT_TS_TSONLY		0		/* timestamps only */
79#define	IPOPT_TS_TSANDADDR	1		/* timestamps and addresses */
80#define	IPOPT_TS_PRESPEC	3		/* specified modules only */
81
82struct iphdr {
83#if defined(__LITTLE_ENDIAN_BITFIELD)
84	__u8	ihl:4,
85		version:4;
86#elif defined (__BIG_ENDIAN_BITFIELD)
87	__u8	version:4,
88  		ihl:4;
89#else
90#error	"Please fix <asm/byteorder.h>"
91#endif
92	__u8	tos;
93	__be16	tot_len;
94	__be16	id;
95	__be16	frag_off;
96	__u8	ttl;
97	__u8	protocol;
98	__u16	check;
99	__be32	saddr;
100	__be32	daddr;
101	/*The options start here. */
102};
103
104struct ip_auth_hdr {
105	__u8  nexthdr;
106	__u8  hdrlen;		/* This one is measured in 32 bit units! */
107	__u16 reserved;
108	__u32 spi;
109	__u32 seq_no;		/* Sequence number */
110	__u8  auth_data[0];	/* Variable len but >=4. Mind the 64 bit alignment! */
111};
112
113struct ip_esp_hdr {
114	__u32 spi;
115	__u32 seq_no;		/* Sequence number */
116	__u8  enc_data[0];	/* Variable len but >=8. Mind the 64 bit alignment! */
117};
118
119struct ip_comp_hdr {
120	__u8 nexthdr;
121	__u8 flags;
122	__u16 cpi;
123};
124
125#endif	/* _LINUX_IP_H */
126