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 _LINUX_IP_H
  19 #define _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
  86 struct 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
 109 struct 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
 118 struct 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
 124 struct ip_comp_hdr {
 125         __u8 nexthdr;
 126         __u8 flags;
 127         __be16 cpi;
 128 };
 129
 130 struct 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 */
 138 enum
 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 /* _LINUX_IP_H */