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 */ 137 138