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1/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2/*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * Definitions for the IP protocol.
8 *
9 * Version: @(#)ip.h 1.0.2 04/28/93
10 *
11 * Authors: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
17 */
18#ifndef _UAPI_LINUX_IP_H
19#define _UAPI_LINUX_IP_H
20#include <linux/types.h>
21#include <asm/byteorder.h>
22
23#define IPTOS_TOS_MASK 0x1E
24#define IPTOS_TOS(tos) ((tos)&IPTOS_TOS_MASK)
25#define IPTOS_LOWDELAY 0x10
26#define IPTOS_THROUGHPUT 0x08
27#define IPTOS_RELIABILITY 0x04
28#define IPTOS_MINCOST 0x02
29
30#define IPTOS_PREC_MASK 0xE0
31#define IPTOS_PREC(tos) ((tos)&IPTOS_PREC_MASK)
32#define IPTOS_PREC_NETCONTROL 0xe0
33#define IPTOS_PREC_INTERNETCONTROL 0xc0
34#define IPTOS_PREC_CRITIC_ECP 0xa0
35#define IPTOS_PREC_FLASHOVERRIDE 0x80
36#define IPTOS_PREC_FLASH 0x60
37#define IPTOS_PREC_IMMEDIATE 0x40
38#define IPTOS_PREC_PRIORITY 0x20
39#define IPTOS_PREC_ROUTINE 0x00
40
41
42/* IP options */
43#define IPOPT_COPY 0x80
44#define IPOPT_CLASS_MASK 0x60
45#define IPOPT_NUMBER_MASK 0x1f
46
47#define IPOPT_COPIED(o) ((o)&IPOPT_COPY)
48#define IPOPT_CLASS(o) ((o)&IPOPT_CLASS_MASK)
49#define IPOPT_NUMBER(o) ((o)&IPOPT_NUMBER_MASK)
50
51#define IPOPT_CONTROL 0x00
52#define IPOPT_RESERVED1 0x20
53#define IPOPT_MEASUREMENT 0x40
54#define IPOPT_RESERVED2 0x60
55
56#define IPOPT_END (0 |IPOPT_CONTROL)
57#define IPOPT_NOOP (1 |IPOPT_CONTROL)
58#define IPOPT_SEC (2 |IPOPT_CONTROL|IPOPT_COPY)
59#define IPOPT_LSRR (3 |IPOPT_CONTROL|IPOPT_COPY)
60#define IPOPT_TIMESTAMP (4 |IPOPT_MEASUREMENT)
61#define IPOPT_CIPSO (6 |IPOPT_CONTROL|IPOPT_COPY)
62#define IPOPT_RR (7 |IPOPT_CONTROL)
63#define IPOPT_SID (8 |IPOPT_CONTROL|IPOPT_COPY)
64#define IPOPT_SSRR (9 |IPOPT_CONTROL|IPOPT_COPY)
65#define IPOPT_RA (20|IPOPT_CONTROL|IPOPT_COPY)
66
67#define IPVERSION 4
68#define MAXTTL 255
69#define IPDEFTTL 64
70
71#define IPOPT_OPTVAL 0
72#define IPOPT_OLEN 1
73#define IPOPT_OFFSET 2
74#define IPOPT_MINOFF 4
75#define MAX_IPOPTLEN 40
76#define IPOPT_NOP IPOPT_NOOP
77#define IPOPT_EOL IPOPT_END
78#define IPOPT_TS IPOPT_TIMESTAMP
79
80#define IPOPT_TS_TSONLY 0 /* timestamps only */
81#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
82#define IPOPT_TS_PRESPEC 3 /* specified modules only */
83
84#define IPV4_BEET_PHMAXLEN 8
85
86struct iphdr {
87#if defined(__LITTLE_ENDIAN_BITFIELD)
88 __u8 ihl:4,
89 version:4;
90#elif defined (__BIG_ENDIAN_BITFIELD)
91 __u8 version:4,
92 ihl:4;
93#else
94#error "Please fix <asm/byteorder.h>"
95#endif
96 __u8 tos;
97 __be16 tot_len;
98 __be16 id;
99 __be16 frag_off;
100 __u8 ttl;
101 __u8 protocol;
102 __sum16 check;
103 __struct_group(/* no tag */, addrs, /* no attrs */,
104 __be32 saddr;
105 __be32 daddr;
106 );
107 /*The options start here. */
108};
109
110
111struct ip_auth_hdr {
112 __u8 nexthdr;
113 __u8 hdrlen; /* This one is measured in 32 bit units! */
114 __be16 reserved;
115 __be32 spi;
116 __be32 seq_no; /* Sequence number */
117 __u8 auth_data[]; /* Variable len but >=4. Mind the 64 bit alignment! */
118};
119
120struct ip_esp_hdr {
121 __be32 spi;
122 __be32 seq_no; /* Sequence number */
123 __u8 enc_data[]; /* Variable len but >=8. Mind the 64 bit alignment! */
124};
125
126struct ip_comp_hdr {
127 __u8 nexthdr;
128 __u8 flags;
129 __be16 cpi;
130};
131
132struct ip_beet_phdr {
133 __u8 nexthdr;
134 __u8 hdrlen;
135 __u8 padlen;
136 __u8 reserved;
137};
138
139/* index values for the variables in ipv4_devconf */
140enum
141{
142 IPV4_DEVCONF_FORWARDING=1,
143 IPV4_DEVCONF_MC_FORWARDING,
144 IPV4_DEVCONF_PROXY_ARP,
145 IPV4_DEVCONF_ACCEPT_REDIRECTS,
146 IPV4_DEVCONF_SECURE_REDIRECTS,
147 IPV4_DEVCONF_SEND_REDIRECTS,
148 IPV4_DEVCONF_SHARED_MEDIA,
149 IPV4_DEVCONF_RP_FILTER,
150 IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE,
151 IPV4_DEVCONF_BOOTP_RELAY,
152 IPV4_DEVCONF_LOG_MARTIANS,
153 IPV4_DEVCONF_TAG,
154 IPV4_DEVCONF_ARPFILTER,
155 IPV4_DEVCONF_MEDIUM_ID,
156 IPV4_DEVCONF_NOXFRM,
157 IPV4_DEVCONF_NOPOLICY,
158 IPV4_DEVCONF_FORCE_IGMP_VERSION,
159 IPV4_DEVCONF_ARP_ANNOUNCE,
160 IPV4_DEVCONF_ARP_IGNORE,
161 IPV4_DEVCONF_PROMOTE_SECONDARIES,
162 IPV4_DEVCONF_ARP_ACCEPT,
163 IPV4_DEVCONF_ARP_NOTIFY,
164 IPV4_DEVCONF_ACCEPT_LOCAL,
165 IPV4_DEVCONF_SRC_VMARK,
166 IPV4_DEVCONF_PROXY_ARP_PVLAN,
167 IPV4_DEVCONF_ROUTE_LOCALNET,
168 IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL,
169 IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL,
170 IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN,
171 IPV4_DEVCONF_DROP_UNICAST_IN_L2_MULTICAST,
172 IPV4_DEVCONF_DROP_GRATUITOUS_ARP,
173 IPV4_DEVCONF_BC_FORWARDING,
174 IPV4_DEVCONF_ARP_EVICT_NOCARRIER,
175 __IPV4_DEVCONF_MAX
176};
177
178#define IPV4_DEVCONF_MAX (__IPV4_DEVCONF_MAX - 1)
179
180#endif /* _UAPI_LINUX_IP_H */