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

/*

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

 *		operating system.  INET is implemented using the  BSD Socket

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

 *

 *		Definitions for the IP protocol.

 *

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

 *

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

 *

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

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

 *		as published by the Free Software Foundation; either version

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

 */

#ifndef _LINUX_IP_H

#define _LINUX_IP_H

#include <linux/types.h>

#include <asm/byteorder.h>

#define IPTOS_TOS_MASK		0x1E

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

#define	IPTOS_LOWDELAY		0x10

#define	IPTOS_THROUGHPUT	0x08

#define	IPTOS_RELIABILITY	0x04

#define	IPTOS_MINCOST		0x02

#define IPTOS_PREC_MASK		0xE0

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

#define IPTOS_PREC_NETCONTROL           0xe0

#define IPTOS_PREC_INTERNETCONTROL      0xc0

#define IPTOS_PREC_CRITIC_ECP           0xa0

#define IPTOS_PREC_FLASHOVERRIDE        0x80

#define IPTOS_PREC_FLASH                0x60

#define IPTOS_PREC_IMMEDIATE            0x40

#define IPTOS_PREC_PRIORITY             0x20

#define IPTOS_PREC_ROUTINE              0x00

/* IP options */

#define IPOPT_COPY		0x80

#define IPOPT_CLASS_MASK	0x60

#define IPOPT_NUMBER_MASK	0x1f

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

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

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

#define	IPOPT_CONTROL		0x00

#define	IPOPT_RESERVED1		0x20

#define	IPOPT_MEASUREMENT	0x40

#define	IPOPT_RESERVED2		0x60

#define IPOPT_END	(0 |IPOPT_CONTROL)

#define IPOPT_NOOP	(1 |IPOPT_CONTROL)

#define IPOPT_SEC	(2 |IPOPT_CONTROL|IPOPT_COPY)

#define IPOPT_LSRR	(3 |IPOPT_CONTROL|IPOPT_COPY)

#define IPOPT_TIMESTAMP	(4 |IPOPT_MEASUREMENT)

#define IPOPT_CIPSO	(6 |IPOPT_CONTROL|IPOPT_COPY)

#define IPOPT_RR	(7 |IPOPT_CONTROL)

#define IPOPT_SID	(8 |IPOPT_CONTROL|IPOPT_COPY)

#define IPOPT_SSRR	(9 |IPOPT_CONTROL|IPOPT_COPY)

#define IPOPT_RA	(20|IPOPT_CONTROL|IPOPT_COPY)

#define IPVERSION	4

#define MAXTTL		255

#define IPDEFTTL	64

#define IPOPT_OPTVAL 0

#define IPOPT_OLEN   1

#define IPOPT_OFFSET 2

#define IPOPT_MINOFF 4

#define MAX_IPOPTLEN 40

#define IPOPT_NOP IPOPT_NOOP

#define IPOPT_EOL IPOPT_END

#define IPOPT_TS  IPOPT_TIMESTAMP

#define	IPOPT_TS_TSONLY		0		/* timestamps only */

#define	IPOPT_TS_TSANDADDR	1		/* timestamps and addresses */

#define	IPOPT_TS_PRESPEC	3		/* specified modules only */

#define IPV4_BEET_PHMAXLEN 8

struct iphdr {

#if defined(__LITTLE_ENDIAN_BITFIELD)

	__u8	ihl:4,

		version:4;

#elif defined (__BIG_ENDIAN_BITFIELD)

	__u8	version:4,

  		ihl:4;

#else

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

#endif

	__u8	tos;

	__be16	tot_len;

	__be16	id;

	__be16	frag_off;

	__u8	ttl;

	__u8	protocol;

	__sum16	check;

	__be32	saddr;

	__be32	daddr;

	/*The options start here. */

};

struct ip_auth_hdr {

	__u8  nexthdr;

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

	__be16 reserved;

	__be32 spi;

	__be32 seq_no;		/* Sequence number */

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

};

struct ip_esp_hdr {

	__be32 spi;

	__be32 seq_no;		/* Sequence number */

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

};

struct ip_comp_hdr {

	__u8 nexthdr;

	__u8 flags;

	__be16 cpi;

};

struct ip_beet_phdr {

	__u8 nexthdr;

	__u8 hdrlen;

	__u8 padlen;

	__u8 reserved;

};

/* index values for the variables in ipv4_devconf */

enum

{

	IPV4_DEVCONF_FORWARDING=1,

	IPV4_DEVCONF_MC_FORWARDING,

	IPV4_DEVCONF_PROXY_ARP,

	IPV4_DEVCONF_ACCEPT_REDIRECTS,

	IPV4_DEVCONF_SECURE_REDIRECTS,

	IPV4_DEVCONF_SEND_REDIRECTS,

	IPV4_DEVCONF_SHARED_MEDIA,

	IPV4_DEVCONF_RP_FILTER,

	IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE,

	IPV4_DEVCONF_BOOTP_RELAY,

	IPV4_DEVCONF_LOG_MARTIANS,

	IPV4_DEVCONF_TAG,

	IPV4_DEVCONF_ARPFILTER,

	IPV4_DEVCONF_MEDIUM_ID,

	IPV4_DEVCONF_NOXFRM,

	IPV4_DEVCONF_NOPOLICY,

	IPV4_DEVCONF_FORCE_IGMP_VERSION,

	IPV4_DEVCONF_ARP_ANNOUNCE,

	IPV4_DEVCONF_ARP_IGNORE,

	IPV4_DEVCONF_PROMOTE_SECONDARIES,

	IPV4_DEVCONF_ARP_ACCEPT,

	IPV4_DEVCONF_ARP_NOTIFY,

	IPV4_DEVCONF_ACCEPT_LOCAL,

	IPV4_DEVCONF_SRC_VMARK,

	IPV4_DEVCONF_PROXY_ARP_PVLAN,

	IPV4_DEVCONF_ROUTE_LOCALNET,

	IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL,

	IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL,

	IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN,

	IPV4_DEVCONF_DROP_UNICAST_IN_L2_MULTICAST,

	IPV4_DEVCONF_DROP_GRATUITOUS_ARP,

	IPV4_DEVCONF_BC_FORWARDING,

	__IPV4_DEVCONF_MAX

};

#define IPV4_DEVCONF_MAX (__IPV4_DEVCONF_MAX - 1)

#endif /* _LINUX_IP_H */