1/*
  2 * INET		An implementation of the TCP/IP protocol suite for the LINUX
  3 *		operating system.  INET is implemented using the  BSD Socket
  4 *		interface as the means of communication with the user level.
  5 *
  6 *		Definitions for the IP protocol.
  7 *
  8 * Version:	@(#)ip.h	1.0.2	04/28/93
  9 *
 10 * Authors:	Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 11 *
 12 *		This program is free software; you can redistribute it and/or
 13 *		modify it under the terms of the GNU General Public License
 14 *		as published by the Free Software Foundation; either version
 15 *		2 of the License, or (at your option) any later version.
 16 */
 17#ifndef _LINUX_IP_H
 18#define _LINUX_IP_H
 19
 20#include "rtl871x_byteorder.h"
 21
 22/* SOL_IP socket options */
 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/* 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_RR	(7 | IPOPT_CONTROL)
 62#define IPOPT_SID	(8 | IPOPT_CONTROL | IPOPT_COPY)
 63#define IPOPT_SSRR	(9 | IPOPT_CONTROL | IPOPT_COPY)
 64#define IPOPT_RA	(20 | IPOPT_CONTROL | IPOPT_COPY)
 65
 66#define IPVERSION	4
 67#define MAXTTL		255
 68#define IPDEFTTL	64
 69
 70/* struct timestamp, struct route and MAX_ROUTES are removed.
 71 *
 72 * REASONS: it is clear that nobody used them because:
 73 * - MAX_ROUTES value was wrong.
 74 * - "struct route" was wrong.
 75 * - "struct timestamp" had fatally misaligned bitfields and was completely
 76 *   unusable.
 77 */
 78
 79#define IPOPT_OPTVAL 0
 80#define IPOPT_OLEN   1
 81#define IPOPT_OFFSET 2
 82#define IPOPT_MINOFF 4
 83#define MAX_IPOPTLEN 40
 84#define IPOPT_NOP IPOPT_NOOP
 85#define IPOPT_EOL IPOPT_END
 86#define IPOPT_TS  IPOPT_TIMESTAMP
 87
 88#define	IPOPT_TS_TSONLY		0		/* timestamps only */
 89#define	IPOPT_TS_TSANDADDR	1		/* timestamps and addresses */
 90#define	IPOPT_TS_PRESPEC	3		/* specified modules only */
 91
 92struct ip_options {
 93	__u32		faddr;			/* Saved first hop address */
 94	unsigned char	optlen;
 95	unsigned char srr;
 96	unsigned char rr;
 97	unsigned char ts;
 98	unsigned char is_setbyuser:1,	/* Set by setsockopt?		      */
 99		      is_data:1,	/* Options in __data, rather than skb */
100		      is_strictroute:1, /* Strict source route		      */
101		      srr_is_hit:1,	/* Packet destination addr was our one*/
102		      is_changed:1,	/* IP checksum more not valid	      */
103		      rr_needaddr:1,	/* Need to record addr of outgoing dev*/
104		      ts_needtime:1,	/* Need to record timestamp	      */
105		      ts_needaddr:1;	/* Need to record addr of outgoing dev*/
106	unsigned char router_alert;
107	unsigned char __pad1;
108	unsigned char __pad2;
109	unsigned char __data[0];
110};
111
112#define optlength(opt) (sizeof(struct ip_options) + opt->optlen)
113
114struct iphdr {
115#if defined(__LITTLE_ENDIAN_BITFIELD)
116	__u8	ihl:4,
117		version:4;
118#elif defined(__BIG_ENDIAN_BITFIELD)
119	__u8	version:4,
120		ihl:4;
121#else
122#error	"Please fix <asm/byteorder.h>"
123#endif
124	__u8	tos;
125	__u16	tot_len;
126	__u16	id;
127	__u16	frag_off;
128	__u8	ttl;
129	__u8	protocol;
130	__u16	check;
131	__u32	saddr;
132	__u32	daddr;
133	/*The options start here. */
134};
135
136#endif	/* _LINUX_IP_H */
137