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 <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
  87 struct 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
 112 struct 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
 121 struct 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
 127 struct ip_comp_hdr {
 128         __u8 nexthdr;
 129         __u8 flags;
 130         __be16 cpi;
 131 };
 132
 133 struct ip_beet_phdr {
 134         __u8 nexthdr;
 135         __u8 hdrlen;
 136         __u8 padlen;
 137         __u8 reserved;
 138 };
 139
 140 /* index values for the variables in ipv4_devconf */
 141 enum
 142 {
 143         IPV4_DEVCONF_FORWARDING=1,
 144         IPV4_DEVCONF_MC_FORWARDING,
 145         IPV4_DEVCONF_PROXY_ARP,
 146         IPV4_DEVCONF_ACCEPT_REDIRECTS,
 147         IPV4_DEVCONF_SECURE_REDIRECTS,
 148         IPV4_DEVCONF_SEND_REDIRECTS,
 149         IPV4_DEVCONF_SHARED_MEDIA,
 150         IPV4_DEVCONF_RP_FILTER,
 151         IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE,
 152         IPV4_DEVCONF_BOOTP_RELAY,
 153         IPV4_DEVCONF_LOG_MARTIANS,
 154         IPV4_DEVCONF_TAG,
 155         IPV4_DEVCONF_ARPFILTER,
 156         IPV4_DEVCONF_MEDIUM_ID,
 157         IPV4_DEVCONF_NOXFRM,
 158         IPV4_DEVCONF_NOPOLICY,
 159         IPV4_DEVCONF_FORCE_IGMP_VERSION,
 160         IPV4_DEVCONF_ARP_ANNOUNCE,
 161         IPV4_DEVCONF_ARP_IGNORE,
 162         IPV4_DEVCONF_PROMOTE_SECONDARIES,
 163         IPV4_DEVCONF_ARP_ACCEPT,
 164         IPV4_DEVCONF_ARP_NOTIFY,
 165         IPV4_DEVCONF_ACCEPT_LOCAL,
 166         IPV4_DEVCONF_SRC_VMARK,
 167         IPV4_DEVCONF_PROXY_ARP_PVLAN,
 168         IPV4_DEVCONF_ROUTE_LOCALNET,
 169         IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL,
 170         IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL,
 171         IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN,
 172         IPV4_DEVCONF_DROP_UNICAST_IN_L2_MULTICAST,
 173         IPV4_DEVCONF_DROP_GRATUITOUS_ARP,
 174         IPV4_DEVCONF_BC_FORWARDING,
 175         IPV4_DEVCONF_ARP_EVICT_NOCARRIER,
 176         __IPV4_DEVCONF_MAX
 177 };
 178
 179 #define IPV4_DEVCONF_MAX (__IPV4_DEVCONF_MAX - 1)
 180
 181 #endif /* _UAPI_LINUX_IP_H */