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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 _LINUX_IP_H
19#define _LINUX_IP_H
20#include <linux/types.h>
21#include <linux/stddef.h>
22#include <asm/byteorder.h>
23
24#define IPTOS_TOS_MASK 0x1E
25#define IPTOS_TOS(tos) ((tos)&IPTOS_TOS_MASK)
26#define IPTOS_LOWDELAY 0x10
27#define IPTOS_THROUGHPUT 0x08
28#define IPTOS_RELIABILITY 0x04
29#define IPTOS_MINCOST 0x02
30
31#define IPTOS_PREC_MASK 0xE0
32#define IPTOS_PREC(tos) ((tos)&IPTOS_PREC_MASK)
33#define IPTOS_PREC_NETCONTROL 0xe0
34#define IPTOS_PREC_INTERNETCONTROL 0xc0
35#define IPTOS_PREC_CRITIC_ECP 0xa0
36#define IPTOS_PREC_FLASHOVERRIDE 0x80
37#define IPTOS_PREC_FLASH 0x60
38#define IPTOS_PREC_IMMEDIATE 0x40
39#define IPTOS_PREC_PRIORITY 0x20
40#define IPTOS_PREC_ROUTINE 0x00
41
42
43/* IP options */
44#define IPOPT_COPY 0x80
45#define IPOPT_CLASS_MASK 0x60
46#define IPOPT_NUMBER_MASK 0x1f
47
48#define IPOPT_COPIED(o) ((o)&IPOPT_COPY)
49#define IPOPT_CLASS(o) ((o)&IPOPT_CLASS_MASK)
50#define IPOPT_NUMBER(o) ((o)&IPOPT_NUMBER_MASK)
51
52#define IPOPT_CONTROL 0x00
53#define IPOPT_RESERVED1 0x20
54#define IPOPT_MEASUREMENT 0x40
55#define IPOPT_RESERVED2 0x60
56
57#define IPOPT_END (0 |IPOPT_CONTROL)
58#define IPOPT_NOOP (1 |IPOPT_CONTROL)
59#define IPOPT_SEC (2 |IPOPT_CONTROL|IPOPT_COPY)
60#define IPOPT_LSRR (3 |IPOPT_CONTROL|IPOPT_COPY)
61#define IPOPT_TIMESTAMP (4 |IPOPT_MEASUREMENT)
62#define IPOPT_CIPSO (6 |IPOPT_CONTROL|IPOPT_COPY)
63#define IPOPT_RR (7 |IPOPT_CONTROL)
64#define IPOPT_SID (8 |IPOPT_CONTROL|IPOPT_COPY)
65#define IPOPT_SSRR (9 |IPOPT_CONTROL|IPOPT_COPY)
66#define IPOPT_RA (20|IPOPT_CONTROL|IPOPT_COPY)
67
68#define IPVERSION 4
69#define MAXTTL 255
70#define IPDEFTTL 64
71
72#define IPOPT_OPTVAL 0
73#define IPOPT_OLEN 1
74#define IPOPT_OFFSET 2
75#define IPOPT_MINOFF 4
76#define MAX_IPOPTLEN 40
77#define IPOPT_NOP IPOPT_NOOP
78#define IPOPT_EOL IPOPT_END
79#define IPOPT_TS IPOPT_TIMESTAMP
80
81#define IPOPT_TS_TSONLY 0 /* timestamps only */
82#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
83#define IPOPT_TS_PRESPEC 3 /* specified modules only */
84
85#define IPV4_BEET_PHMAXLEN 8
86
87struct iphdr {
88#if defined(__LITTLE_ENDIAN_BITFIELD)
89 __u8 ihl:4,
90 version:4;
91#elif defined (__BIG_ENDIAN_BITFIELD)
92 __u8 version:4,
93 ihl:4;
94#else
95#error "Please fix <asm/byteorder.h>"
96#endif
97 __u8 tos;
98 __be16 tot_len;
99 __be16 id;
100 __be16 frag_off;
101 __u8 ttl;
102 __u8 protocol;
103 __sum16 check;
104 __struct_group(/* no tag */, addrs, /* no attrs */,
105 __be32 saddr;
106 __be32 daddr;
107 );
108 /*The options start here. */
109};
110
111
112struct ip_auth_hdr {
113 __u8 nexthdr;
114 __u8 hdrlen; /* This one is measured in 32 bit units! */
115 __be16 reserved;
116 __be32 spi;
117 __be32 seq_no; /* Sequence number */
118 __u8 auth_data[]; /* Variable len but >=4. Mind the 64 bit alignment! */
119};
120
121struct ip_esp_hdr {
122 __be32 spi;
123 __be32 seq_no; /* Sequence number */
124 __u8 enc_data[]; /* Variable len but >=8. Mind the 64 bit alignment! */
125};
126
127struct ip_comp_hdr {
128 __u8 nexthdr;
129 __u8 flags;
130 __be16 cpi;
131};
132
133struct ip_beet_phdr {
134 __u8 nexthdr;
135 __u8 hdrlen;
136 __u8 padlen;
137 __u8 reserved;
138};
139
140struct ip_iptfs_hdr {
141 __u8 subtype; /* 0*: basic, 1: CC */
142 __u8 flags;
143 __be16 block_offset;
144};
145
146struct ip_iptfs_cc_hdr {
147 __u8 subtype; /* 0: basic, 1*: CC */
148 __u8 flags;
149 __be16 block_offset;
150 __be32 loss_rate;
151 __be64 rtt_adelay_xdelay;
152 __be32 tval;
153 __be32 techo;
154};
155
156/* index values for the variables in ipv4_devconf */
157enum
158{
159 IPV4_DEVCONF_FORWARDING=1,
160 IPV4_DEVCONF_MC_FORWARDING,
161 IPV4_DEVCONF_PROXY_ARP,
162 IPV4_DEVCONF_ACCEPT_REDIRECTS,
163 IPV4_DEVCONF_SECURE_REDIRECTS,
164 IPV4_DEVCONF_SEND_REDIRECTS,
165 IPV4_DEVCONF_SHARED_MEDIA,
166 IPV4_DEVCONF_RP_FILTER,
167 IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE,
168 IPV4_DEVCONF_BOOTP_RELAY,
169 IPV4_DEVCONF_LOG_MARTIANS,
170 IPV4_DEVCONF_TAG,
171 IPV4_DEVCONF_ARPFILTER,
172 IPV4_DEVCONF_MEDIUM_ID,
173 IPV4_DEVCONF_NOXFRM,
174 IPV4_DEVCONF_NOPOLICY,
175 IPV4_DEVCONF_FORCE_IGMP_VERSION,
176 IPV4_DEVCONF_ARP_ANNOUNCE,
177 IPV4_DEVCONF_ARP_IGNORE,
178 IPV4_DEVCONF_PROMOTE_SECONDARIES,
179 IPV4_DEVCONF_ARP_ACCEPT,
180 IPV4_DEVCONF_ARP_NOTIFY,
181 IPV4_DEVCONF_ACCEPT_LOCAL,
182 IPV4_DEVCONF_SRC_VMARK,
183 IPV4_DEVCONF_PROXY_ARP_PVLAN,
184 IPV4_DEVCONF_ROUTE_LOCALNET,
185 IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL,
186 IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL,
187 IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN,
188 IPV4_DEVCONF_DROP_UNICAST_IN_L2_MULTICAST,
189 IPV4_DEVCONF_DROP_GRATUITOUS_ARP,
190 IPV4_DEVCONF_BC_FORWARDING,
191 IPV4_DEVCONF_ARP_EVICT_NOCARRIER,
192 __IPV4_DEVCONF_MAX
193};
194
195#define IPV4_DEVCONF_MAX (__IPV4_DEVCONF_MAX - 1)
196
197#endif /* _LINUX_IP_H */