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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020019#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#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)
Paul Moore11a03f72006-08-03 16:46:20 -070060#define IPOPT_CIPSO (6 |IPOPT_CONTROL|IPOPT_COPY)
Linus Torvalds1da177e2005-04-16 15:20:36 -070061#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
Diego Beltrami0a694522006-10-03 23:47:05 -070083#define IPV4_BEET_PHMAXLEN 8
84
Linus Torvalds1da177e2005-04-16 15:20:36 -070085struct 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;
Alexey Dobriyan76ab6082006-01-06 13:24:29 -080096 __be16 tot_len;
97 __be16 id;
98 __be16 frag_off;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 __u8 ttl;
100 __u8 protocol;
Al Viro9981a0e2006-11-14 21:24:30 -0800101 __sum16 check;
Alexey Dobriyan76ab6082006-01-06 13:24:29 -0800102 __be32 saddr;
103 __be32 daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 /*The options start here. */
105};
106
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700107#ifdef __KERNEL__
108#include <linux/skbuff.h>
109
110static inline struct iphdr *ip_hdr(const struct sk_buff *skb)
111{
112 return (struct iphdr *)skb_network_header(skb);
113}
Arnaldo Carvalho de Melob0061ce2007-04-25 18:02:22 -0700114
115static inline struct iphdr *ipip_hdr(const struct sk_buff *skb)
116{
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700117 return (struct iphdr *)skb_transport_header(skb);
Arnaldo Carvalho de Melob0061ce2007-04-25 18:02:22 -0700118}
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700119#endif
120
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121struct ip_auth_hdr {
122 __u8 nexthdr;
123 __u8 hdrlen; /* This one is measured in 32 bit units! */
Al Viro046d0332006-09-26 21:24:24 -0700124 __be16 reserved;
125 __be32 spi;
126 __be32 seq_no; /* Sequence number */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 __u8 auth_data[0]; /* Variable len but >=4. Mind the 64 bit alignment! */
128};
129
130struct ip_esp_hdr {
Al Viro046d0332006-09-26 21:24:24 -0700131 __be32 spi;
132 __be32 seq_no; /* Sequence number */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 __u8 enc_data[0]; /* Variable len but >=8. Mind the 64 bit alignment! */
134};
135
136struct ip_comp_hdr {
137 __u8 nexthdr;
138 __u8 flags;
Al Viro046d0332006-09-26 21:24:24 -0700139 __be16 cpi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140};
141
Diego Beltrami0a694522006-10-03 23:47:05 -0700142struct ip_beet_phdr {
143 __u8 nexthdr;
144 __u8 hdrlen;
145 __u8 padlen;
146 __u8 reserved;
147};
148
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149#endif /* _LINUX_IP_H */