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 (at) 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 <linux/types.h> 20 #include <asm/byteorder.h> 21 22 #define IPTOS_TOS_MASK 0x1E 23 #define IPTOS_TOS(tos) ((tos)&IPTOS_TOS_MASK) 24 #define IPTOS_LOWDELAY 0x10 25 #define IPTOS_THROUGHPUT 0x08 26 #define IPTOS_RELIABILITY 0x04 27 #define IPTOS_MINCOST 0x02 28 29 #define IPTOS_PREC_MASK 0xE0 30 #define IPTOS_PREC(tos) ((tos)&IPTOS_PREC_MASK) 31 #define IPTOS_PREC_NETCONTROL 0xe0 32 #define IPTOS_PREC_INTERNETCONTROL 0xc0 33 #define IPTOS_PREC_CRITIC_ECP 0xa0 34 #define IPTOS_PREC_FLASHOVERRIDE 0x80 35 #define IPTOS_PREC_FLASH 0x60 36 #define IPTOS_PREC_IMMEDIATE 0x40 37 #define IPTOS_PREC_PRIORITY 0x20 38 #define IPTOS_PREC_ROUTINE 0x00 39 40 41 /* IP options */ 42 #define IPOPT_COPY 0x80 43 #define IPOPT_CLASS_MASK 0x60 44 #define IPOPT_NUMBER_MASK 0x1f 45 46 #define IPOPT_COPIED(o) ((o)&IPOPT_COPY) 47 #define IPOPT_CLASS(o) ((o)&IPOPT_CLASS_MASK) 48 #define IPOPT_NUMBER(o) ((o)&IPOPT_NUMBER_MASK) 49 50 #define IPOPT_CONTROL 0x00 51 #define IPOPT_RESERVED1 0x20 52 #define IPOPT_MEASUREMENT 0x40 53 #define IPOPT_RESERVED2 0x60 54 55 #define IPOPT_END (0 |IPOPT_CONTROL) 56 #define IPOPT_NOOP (1 |IPOPT_CONTROL) 57 #define IPOPT_SEC (2 |IPOPT_CONTROL|IPOPT_COPY) 58 #define IPOPT_LSRR (3 |IPOPT_CONTROL|IPOPT_COPY) 59 #define IPOPT_TIMESTAMP (4 |IPOPT_MEASUREMENT) 60 #define IPOPT_RR (7 |IPOPT_CONTROL) 61 #define IPOPT_SID (8 |IPOPT_CONTROL|IPOPT_COPY) 62 #define IPOPT_SSRR (9 |IPOPT_CONTROL|IPOPT_COPY) 63 #define IPOPT_RA (20|IPOPT_CONTROL|IPOPT_COPY) 64 65 #define IPVERSION 4 66 #define MAXTTL 255 67 #define IPDEFTTL 64 68 69 #define IPOPT_OPTVAL 0 70 #define IPOPT_OLEN 1 71 #define IPOPT_OFFSET 2 72 #define IPOPT_MINOFF 4 73 #define MAX_IPOPTLEN 40 74 #define IPOPT_NOP IPOPT_NOOP 75 #define IPOPT_EOL IPOPT_END 76 #define IPOPT_TS IPOPT_TIMESTAMP 77 78 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 79 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 80 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 81 82 struct iphdr { 83 #if defined(__LITTLE_ENDIAN_BITFIELD) 84 __u8 ihl:4, 85 version:4; 86 #elif defined (__BIG_ENDIAN_BITFIELD) 87 __u8 version:4, 88 ihl:4; 89 #else 90 #error "Please fix <asm/byteorder.h>" 91 #endif 92 __u8 tos; 93 __be16 tot_len; 94 __be16 id; 95 __be16 frag_off; 96 __u8 ttl; 97 __u8 protocol; 98 __u16 check; 99 __be32 saddr; 100 __be32 daddr; 101 /*The options start here. */ 102 }; 103 104 struct ip_auth_hdr { 105 __u8 nexthdr; 106 __u8 hdrlen; /* This one is measured in 32 bit units! */ 107 __u16 reserved; 108 __u32 spi; 109 __u32 seq_no; /* Sequence number */ 110 __u8 auth_data[0]; /* Variable len but >=4. Mind the 64 bit alignment! */ 111 }; 112 113 struct ip_esp_hdr { 114 __u32 spi; 115 __u32 seq_no; /* Sequence number */ 116 __u8 enc_data[0]; /* Variable len but >=8. Mind the 64 bit alignment! */ 117 }; 118 119 struct ip_comp_hdr { 120 __u8 nexthdr; 121 __u8 flags; 122 __u16 cpi; 123 }; 124 125 #endif /* _LINUX_IP_H */ 126
