/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */

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/*

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* INET An implementation of the TCP/IP protocol suite for the LINUX

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* operating system. INET is implemented using the BSD Socket

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* interface as the means of communication with the user level.

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*

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* Definitions for the IP protocol.

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*

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* Version: @(#)ip.h 1.0.2 04/28/93

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*

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* Authors: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>

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*

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* This program is free software; you can redistribute it and/or

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* modify it under the terms of the GNU General Public License

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* as published by the Free Software Foundation; either version

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* 2 of the License, or (at your option) any later version.

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*/

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#ifndef _LINUX_IP_H

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#define _LINUX_IP_H

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#include <linux/types.h>

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#include <asm/byteorder.h>

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#define IPTOS_TOS_MASK 0x1E

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#define IPTOS_TOS(tos) ((tos)&IPTOS_TOS_MASK)

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#define IPTOS_LOWDELAY 0x10

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#define IPTOS_THROUGHPUT 0x08

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#define IPTOS_RELIABILITY 0x04

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#define IPTOS_MINCOST 0x02

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#define IPTOS_PREC_MASK 0xE0

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#define IPTOS_PREC(tos) ((tos)&IPTOS_PREC_MASK)

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#define IPTOS_PREC_NETCONTROL 0xe0

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#define IPTOS_PREC_INTERNETCONTROL 0xc0

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#define IPTOS_PREC_CRITIC_ECP 0xa0

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#define IPTOS_PREC_FLASHOVERRIDE 0x80

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#define IPTOS_PREC_FLASH 0x60

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#define IPTOS_PREC_IMMEDIATE 0x40

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#define IPTOS_PREC_PRIORITY 0x20

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#define IPTOS_PREC_ROUTINE 0x00

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/* IP options */

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#define IPOPT_COPY 0x80

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#define IPOPT_CLASS_MASK 0x60

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#define IPOPT_NUMBER_MASK 0x1f

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#define IPOPT_COPIED(o) ((o)&IPOPT_COPY)

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#define IPOPT_CLASS(o) ((o)&IPOPT_CLASS_MASK)

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#define IPOPT_NUMBER(o) ((o)&IPOPT_NUMBER_MASK)

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#define IPOPT_CONTROL 0x00

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#define IPOPT_RESERVED1 0x20

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#define IPOPT_MEASUREMENT 0x40

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#define IPOPT_RESERVED2 0x60

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#define IPOPT_END (0 |IPOPT_CONTROL)

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#define IPOPT_NOOP (1 |IPOPT_CONTROL)

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#define IPOPT_SEC (2 |IPOPT_CONTROL|IPOPT_COPY)

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#define IPOPT_LSRR (3 |IPOPT_CONTROL|IPOPT_COPY)

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#define IPOPT_TIMESTAMP (4 |IPOPT_MEASUREMENT)

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#define IPOPT_CIPSO (6 |IPOPT_CONTROL|IPOPT_COPY)

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#define IPOPT_RR (7 |IPOPT_CONTROL)

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#define IPOPT_SID (8 |IPOPT_CONTROL|IPOPT_COPY)

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#define IPOPT_SSRR (9 |IPOPT_CONTROL|IPOPT_COPY)

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#define IPOPT_RA (20|IPOPT_CONTROL|IPOPT_COPY)

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#define IPVERSION 4

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#define MAXTTL 255

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#define IPDEFTTL 64

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#define IPOPT_OPTVAL 0

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#define IPOPT_OLEN 1

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#define IPOPT_OFFSET 2

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#define IPOPT_MINOFF 4

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#define MAX_IPOPTLEN 40

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#define IPOPT_NOP IPOPT_NOOP

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#define IPOPT_EOL IPOPT_END

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#define IPOPT_TS IPOPT_TIMESTAMP

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#define IPOPT_TS_TSONLY 0 /* timestamps only */

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#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */

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#define IPOPT_TS_PRESPEC 3 /* specified modules only */

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#define IPV4_BEET_PHMAXLEN 8

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struct iphdr {

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#if defined(__LITTLE_ENDIAN_BITFIELD)

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__u8 ihl:4,

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version:4;

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#elif defined (__BIG_ENDIAN_BITFIELD)

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__u8 version:4,

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ihl:4;

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#else

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#error "Please fix <asm/byteorder.h>"

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#endif

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__u8 tos;

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__be16 tot_len;

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__be16 id;

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__be16 frag_off;

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__u8 ttl;

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__u8 protocol;

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__sum16 check;

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__be32 saddr;

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__be32 daddr;

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/*The options start here. */

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};

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struct ip_auth_hdr {

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__u8 nexthdr;

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__u8 hdrlen; /* This one is measured in 32 bit units! */

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__be16 reserved;

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__be32 spi;

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__be32 seq_no; /* Sequence number */

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__u8 auth_data[0]; /* Variable len but >=4. Mind the 64 bit alignment! */

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};

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struct ip_esp_hdr {

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__be32 spi;

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__be32 seq_no; /* Sequence number */

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__u8 enc_data[0]; /* Variable len but >=8. Mind the 64 bit alignment! */

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};

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struct ip_comp_hdr {

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__u8 nexthdr;

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__u8 flags;

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__be16 cpi;

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};

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struct ip_beet_phdr {

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__u8 nexthdr;

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__u8 hdrlen;

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__u8 padlen;

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__u8 reserved;

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};

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/* index values for the variables in ipv4_devconf */

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enum

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{

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IPV4_DEVCONF_FORWARDING=1,

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IPV4_DEVCONF_MC_FORWARDING,

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IPV4_DEVCONF_PROXY_ARP,

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IPV4_DEVCONF_ACCEPT_REDIRECTS,

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IPV4_DEVCONF_SECURE_REDIRECTS,

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IPV4_DEVCONF_SEND_REDIRECTS,

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IPV4_DEVCONF_SHARED_MEDIA,

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IPV4_DEVCONF_RP_FILTER,

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IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE,

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IPV4_DEVCONF_BOOTP_RELAY,

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IPV4_DEVCONF_LOG_MARTIANS,

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IPV4_DEVCONF_TAG,

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IPV4_DEVCONF_ARPFILTER,

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IPV4_DEVCONF_MEDIUM_ID,

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IPV4_DEVCONF_NOXFRM,

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IPV4_DEVCONF_NOPOLICY,

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IPV4_DEVCONF_FORCE_IGMP_VERSION,

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IPV4_DEVCONF_ARP_ANNOUNCE,

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IPV4_DEVCONF_ARP_IGNORE,

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IPV4_DEVCONF_PROMOTE_SECONDARIES,

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IPV4_DEVCONF_ARP_ACCEPT,

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IPV4_DEVCONF_ARP_NOTIFY,

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IPV4_DEVCONF_ACCEPT_LOCAL,

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IPV4_DEVCONF_SRC_VMARK,

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IPV4_DEVCONF_PROXY_ARP_PVLAN,

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IPV4_DEVCONF_ROUTE_LOCALNET,

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IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL,

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IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL,

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IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN,

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IPV4_DEVCONF_DROP_UNICAST_IN_L2_MULTICAST,

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IPV4_DEVCONF_DROP_GRATUITOUS_ARP,

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IPV4_DEVCONF_BC_FORWARDING,

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__IPV4_DEVCONF_MAX

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};

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#define IPV4_DEVCONF_MAX (__IPV4_DEVCONF_MAX - 1)

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#endif /* _LINUX_IP_H */

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