ip.h revision 6ea19f626488db5efcc757f2d8a2fd362d0567ce 
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 _UAPI_LINUX_IP_H
18#define _UAPI_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_CIPSO	(6 |IPOPT_CONTROL|IPOPT_COPY)
61#define IPOPT_RR	(7 |IPOPT_CONTROL)
62#define IPOPT_SID	(8 |IPOPT_CONTROL|IPOPT_COPY)
63#define IPOPT_SSRR	(9 |IPOPT_CONTROL|IPOPT_COPY)
64#define IPOPT_RA	(20|IPOPT_CONTROL|IPOPT_COPY)
65
66#define IPVERSION	4
67#define MAXTTL		255
68#define IPDEFTTL	64
69
70#define IPOPT_OPTVAL 0
71#define IPOPT_OLEN   1
72#define IPOPT_OFFSET 2
73#define IPOPT_MINOFF 4
74#define MAX_IPOPTLEN 40
75#define IPOPT_NOP IPOPT_NOOP
76#define IPOPT_EOL IPOPT_END
77#define IPOPT_TS  IPOPT_TIMESTAMP
78
79#define	IPOPT_TS_TSONLY		0		/* timestamps only */
80#define	IPOPT_TS_TSANDADDR	1		/* timestamps and addresses */
81#define	IPOPT_TS_PRESPEC	3		/* specified modules only */
82
83#define IPV4_BEET_PHMAXLEN 8
84
85struct iphdr {
86#if defined(__LITTLE_ENDIAN_BITFIELD)
87	__u8	ihl:4,
88		version:4;
89#elif defined (__BIG_ENDIAN_BITFIELD)
90	__u8	version:4,
91  		ihl:4;
92#else
93#error	"Please fix <asm/byteorder.h>"
94#endif
95	__u8	tos;
96	__be16	tot_len;
97	__be16	id;
98	__be16	frag_off;
99	__u8	ttl;
100	__u8	protocol;
101	__sum16	check;
102	__be32	saddr;
103	__be32	daddr;
104	/*The options start here. */
105};
106
107
108struct ip_auth_hdr {
109	__u8  nexthdr;
110	__u8  hdrlen;		/* This one is measured in 32 bit units! */
111	__be16 reserved;
112	__be32 spi;
113	__be32 seq_no;		/* Sequence number */
114	__u8  auth_data[0];	/* Variable len but >=4. Mind the 64 bit alignment! */
115};
116
117struct ip_esp_hdr {
118	__be32 spi;
119	__be32 seq_no;		/* Sequence number */
120	__u8  enc_data[0];	/* Variable len but >=8. Mind the 64 bit alignment! */
121};
122
123struct ip_comp_hdr {
124	__u8 nexthdr;
125	__u8 flags;
126	__be16 cpi;
127};
128
129struct ip_beet_phdr {
130	__u8 nexthdr;
131	__u8 hdrlen;
132	__u8 padlen;
133	__u8 reserved;
134};
135
136#endif /* _UAPI_LINUX_IP_H */
137