LXR linux/include/uapi/linux/ip.h

   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        __be32  saddr;
 104        __be32  daddr;
 105        /*The options start here. */
 106};
 107
 108
 109struct ip_auth_hdr {
 110        __u8  nexthdr;
 111        __u8  hdrlen;           /* This one is measured in 32 bit units! */
 112        __be16 reserved;
 113        __be32 spi;
 114        __be32 seq_no;          /* Sequence number */
 115        __u8  auth_data[0];     /* Variable len but >=4. Mind the 64 bit alignment! */
 116};
 117
 118struct ip_esp_hdr {
 119        __be32 spi;
 120        __be32 seq_no;          /* Sequence number */
 121        __u8  enc_data[0];      /* Variable len but >=8. Mind the 64 bit alignment! */
 122};
 123
 124struct ip_comp_hdr {
 125        __u8 nexthdr;
 126        __u8 flags;
 127        __be16 cpi;
 128};
 129
 130struct ip_beet_phdr {
 131        __u8 nexthdr;
 132        __u8 hdrlen;
 133        __u8 padlen;
 134        __u8 reserved;
 135};
 136
 137/* index values for the variables in ipv4_devconf */
 138enum
 139{
 140        IPV4_DEVCONF_FORWARDING=1,
 141        IPV4_DEVCONF_MC_FORWARDING,
 142        IPV4_DEVCONF_PROXY_ARP,
 143        IPV4_DEVCONF_ACCEPT_REDIRECTS,
 144        IPV4_DEVCONF_SECURE_REDIRECTS,
 145        IPV4_DEVCONF_SEND_REDIRECTS,
 146        IPV4_DEVCONF_SHARED_MEDIA,
 147        IPV4_DEVCONF_RP_FILTER,
 148        IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE,
 149        IPV4_DEVCONF_BOOTP_RELAY,
 150        IPV4_DEVCONF_LOG_MARTIANS,
 151        IPV4_DEVCONF_TAG,
 152        IPV4_DEVCONF_ARPFILTER,
 153        IPV4_DEVCONF_MEDIUM_ID,
 154        IPV4_DEVCONF_NOXFRM,
 155        IPV4_DEVCONF_NOPOLICY,
 156        IPV4_DEVCONF_FORCE_IGMP_VERSION,
 157        IPV4_DEVCONF_ARP_ANNOUNCE,
 158        IPV4_DEVCONF_ARP_IGNORE,
 159        IPV4_DEVCONF_PROMOTE_SECONDARIES,
 160        IPV4_DEVCONF_ARP_ACCEPT,
 161        IPV4_DEVCONF_ARP_NOTIFY,
 162        IPV4_DEVCONF_ACCEPT_LOCAL,
 163        IPV4_DEVCONF_SRC_VMARK,
 164        IPV4_DEVCONF_PROXY_ARP_PVLAN,
 165        IPV4_DEVCONF_ROUTE_LOCALNET,
 166        IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL,
 167        IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL,
 168        IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN,
 169        IPV4_DEVCONF_DROP_UNICAST_IN_L2_MULTICAST,
 170        IPV4_DEVCONF_DROP_GRATUITOUS_ARP,
 171        IPV4_DEVCONF_BC_FORWARDING,
 172        __IPV4_DEVCONF_MAX
 173};
 174
 175#define IPV4_DEVCONF_MAX (__IPV4_DEVCONF_MAX - 1)
 176
 177#endif /* _UAPI_LINUX_IP_H */
 178