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 #include <asm/byteorder.h> 20 21 /* SOL_IP socket options */ 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_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 unusable. 76 */ 77 78 #define IPOPT_OPTVAL 0 79 #define IPOPT_OLEN 1 80 #define IPOPT_OFFSET 2 81 #define IPOPT_MINOFF 4 82 #define MAX_IPOPTLEN 40 83 #define IPOPT_NOP IPOPT_NOOP 84 #define IPOPT_EOL IPOPT_END 85 #define IPOPT_TS IPOPT_TIMESTAMP 86 87 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 88 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 89 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 90 91 #ifdef __KERNEL__ 92 93 struct ip_options { 94 __u32 faddr; /* Saved first hop address */ 95 unsigned char optlen; 96 unsigned char srr; 97 unsigned char rr; 98 unsigned char ts; 99 unsigned char is_setbyuser:1, /* Set by setsockopt? */ 100 is_data:1, /* Options in __data, rather than skb */ 101 is_strictroute:1, /* Strict source route */ 102 srr_is_hit:1, /* Packet destination addr was our one */ 103 is_changed:1, /* IP checksum more not valid */ 104 rr_needaddr:1, /* Need to record addr of outgoing dev */ 105 ts_needtime:1, /* Need to record timestamp */ 106 ts_needaddr:1; /* Need to record addr of outgoing dev */ 107 unsigned char router_alert; 108 unsigned char __pad1; 109 unsigned char __pad2; 110 unsigned char __data[0]; 111 }; 112 113 #define optlength(opt) (sizeof(struct ip_options) + opt->optlen) 114 #endif 115 116 struct iphdr { 117 #if defined(__LITTLE_ENDIAN_BITFIELD) 118 __u8 ihl:4, 119 version:4; 120 #elif defined (__BIG_ENDIAN_BITFIELD) 121 __u8 version:4, 122 ihl:4; 123 #else 124 #error "Please fix <asm/byteorder.h>" 125 #endif 126 __u8 tos; 127 __u16 tot_len; 128 __u16 id; 129 __u16 frag_off; 130 __u8 ttl; 131 __u8 protocol; 132 __u16 check; 133 __u32 saddr; 134 __u32 daddr; 135 /*The options start here. */ 136 }; 137 138 #endif /* _LINUX_IP_H */ 139