| 1 | /* |
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| 2 | * Copyright (c) 1982, 1986, 1993 |
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| 3 | * The Regents of the University of California. All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * 1. Redistributions of source code must retain the above copyright |
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| 9 | * notice, this list of conditions and the following disclaimer. |
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 11 | * notice, this list of conditions and the following disclaimer in the |
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| 12 | * documentation and/or other materials provided with the distribution. |
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| 13 | * 4. Neither the name of the University nor the names of its contributors |
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| 14 | * may be used to endorse or promote products derived from this software |
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| 15 | * without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 27 | * SUCH DAMAGE. |
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| 28 | * |
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| 29 | * @(#)ip.h 8.2 (Berkeley) 6/1/94 |
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| 30 | * $FreeBSD: src/sys/netinet/ip.h,v 1.29 2005/01/07 01:45:44 imp Exp $ |
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| 31 | */ |
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| 32 | |
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| 33 | /* |
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| 34 | * $Id$ |
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| 35 | */ |
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| 36 | |
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| 37 | #ifndef _NETINET_IP_H_ |
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| 38 | #define _NETINET_IP_H_ |
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| 39 | |
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| 40 | #include <sys/cdefs.h> |
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| 41 | |
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| 42 | /* |
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| 43 | * Definitions for internet protocol version 4. |
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| 44 | * Per RFC 791, September 1981. |
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| 45 | */ |
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| 46 | #define IPVERSION 4 |
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| 47 | |
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| 48 | #ifndef __packed |
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| 49 | #if defined(__GNUC__) |
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| 50 | #define __packed __attribute__((packed)) |
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| 51 | #define __aligned(x) __attribute__((aligned(x))) |
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| 52 | #else |
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| 53 | #define __packed |
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| 54 | #define __aligned(x) |
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| 55 | #endif |
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| 56 | #endif |
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| 57 | |
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| 58 | /* |
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| 59 | * Structure of an internet header, naked of options. |
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| 60 | */ |
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| 61 | struct ip { |
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| 62 | #ifdef _IP_VHL |
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| 63 | u_char ip_vhl; /* version << 4 | header length >> 2 */ |
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| 64 | #else |
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| 65 | #if BYTE_ORDER == LITTLE_ENDIAN |
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| 66 | u_int ip_hl:4, /* header length */ |
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| 67 | ip_v:4; /* version */ |
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| 68 | #endif |
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| 69 | #if BYTE_ORDER == BIG_ENDIAN |
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| 70 | u_int ip_v:4, /* version */ |
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| 71 | ip_hl:4; /* header length */ |
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| 72 | #endif |
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| 73 | #endif /* not _IP_VHL */ |
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| 74 | u_char ip_tos; /* type of service */ |
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| 75 | u_short ip_len; /* total length */ |
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| 76 | u_short ip_id; /* identification */ |
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| 77 | u_short ip_off; /* fragment offset field */ |
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| 78 | #define IP_RF 0x8000 /* reserved fragment flag */ |
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| 79 | #define IP_DF 0x4000 /* dont fragment flag */ |
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| 80 | #define IP_MF 0x2000 /* more fragments flag */ |
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| 81 | #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ |
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| 82 | u_char ip_ttl; /* time to live */ |
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| 83 | u_char ip_p; /* protocol */ |
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| 84 | u_short ip_sum; /* checksum */ |
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| 85 | struct in_addr ip_src,ip_dst; /* source and dest address */ |
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| 86 | } __packed __aligned(4); |
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| 87 | |
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| 88 | #ifdef _IP_VHL |
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| 89 | #define IP_MAKE_VHL(v, hl) ((v) << 4 | (hl)) |
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| 90 | #define IP_VHL_HL(vhl) ((vhl) & 0x0f) |
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| 91 | #define IP_VHL_V(vhl) ((vhl) >> 4) |
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| 92 | #define IP_VHL_BORING 0x45 |
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| 93 | #endif |
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| 94 | |
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| 95 | #ifdef CTASSERT |
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| 96 | CTASSERT(sizeof (struct ip) == 20); |
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| 97 | #endif |
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| 98 | |
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| 99 | #define IP_MAXPACKET 65535L /* maximum packet size */ |
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| 100 | |
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| 101 | /* |
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| 102 | * Definitions for IP type of service (ip_tos) |
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| 103 | */ |
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| 104 | #define IPTOS_LOWDELAY 0x10 |
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| 105 | #define IPTOS_THROUGHPUT 0x08 |
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| 106 | #define IPTOS_RELIABILITY 0x04 |
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| 107 | #define IPTOS_MINCOST 0x02 |
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| 108 | #if 1 |
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| 109 | /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */ |
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| 110 | #define IPTOS_CE 0x01 |
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| 111 | #define IPTOS_ECT 0x02 |
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| 112 | #endif |
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| 113 | |
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| 114 | /* |
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| 115 | * Definitions for IP precedence (also in ip_tos) (hopefully unused) |
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| 116 | */ |
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| 117 | #define IPTOS_PREC_NETCONTROL 0xe0 |
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| 118 | #define IPTOS_PREC_INTERNETCONTROL 0xc0 |
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| 119 | #define IPTOS_PREC_CRITIC_ECP 0xa0 |
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| 120 | #define IPTOS_PREC_FLASHOVERRIDE 0x80 |
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| 121 | #define IPTOS_PREC_FLASH 0x60 |
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| 122 | #define IPTOS_PREC_IMMEDIATE 0x40 |
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| 123 | #define IPTOS_PREC_PRIORITY 0x20 |
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| 124 | #define IPTOS_PREC_ROUTINE 0x00 |
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| 125 | |
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| 126 | /* |
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| 127 | * ECN (Explicit Congestion Notification) codepoints in RFC3168 |
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| 128 | * mapped to the lower 2 bits of the TOS field. |
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| 129 | */ |
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| 130 | #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */ |
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| 131 | #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */ |
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| 132 | #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */ |
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| 133 | #define IPTOS_ECN_CE 0x03 /* congestion experienced */ |
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| 134 | #define IPTOS_ECN_MASK 0x03 /* ECN field mask */ |
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| 135 | |
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| 136 | /* |
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| 137 | * Definitions for options. |
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| 138 | */ |
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| 139 | #define IPOPT_COPIED(o) ((o)&0x80) |
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| 140 | #define IPOPT_CLASS(o) ((o)&0x60) |
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| 141 | #define IPOPT_NUMBER(o) ((o)&0x1f) |
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| 142 | |
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| 143 | #define IPOPT_CONTROL 0x00 |
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| 144 | #define IPOPT_RESERVED1 0x20 |
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| 145 | #define IPOPT_DEBMEAS 0x40 |
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| 146 | #define IPOPT_RESERVED2 0x60 |
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| 147 | |
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| 148 | #define IPOPT_EOL 0 /* end of option list */ |
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| 149 | #define IPOPT_NOP 1 /* no operation */ |
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| 150 | |
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| 151 | #define IPOPT_RR 7 /* record packet route */ |
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| 152 | #define IPOPT_TS 68 /* timestamp */ |
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| 153 | #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ |
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| 154 | #define IPOPT_LSRR 131 /* loose source route */ |
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| 155 | #define IPOPT_ESO 133 /* extended security */ |
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| 156 | #define IPOPT_CIPSO 134 /* commerical security */ |
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| 157 | #define IPOPT_SATID 136 /* satnet id */ |
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| 158 | #define IPOPT_SSRR 137 /* strict source route */ |
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| 159 | #define IPOPT_RA 148 /* router alert */ |
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| 160 | |
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| 161 | /* |
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| 162 | * Offsets to fields in options other than EOL and NOP. |
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| 163 | */ |
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| 164 | #define IPOPT_OPTVAL 0 /* option ID */ |
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| 165 | #define IPOPT_OLEN 1 /* option length */ |
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| 166 | #define IPOPT_OFFSET 2 /* offset within option */ |
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| 167 | #define IPOPT_MINOFF 4 /* min value of above */ |
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| 168 | |
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| 169 | /* |
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| 170 | * Time stamp option structure. |
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| 171 | */ |
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| 172 | struct ip_timestamp { |
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| 173 | u_char ipt_code; /* IPOPT_TS */ |
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| 174 | u_char ipt_len; /* size of structure (variable) */ |
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| 175 | u_char ipt_ptr; /* index of current entry */ |
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| 176 | #if BYTE_ORDER == LITTLE_ENDIAN |
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| 177 | u_int ipt_flg:4, /* flags, see below */ |
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| 178 | ipt_oflw:4; /* overflow counter */ |
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| 179 | #endif |
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| 180 | #if BYTE_ORDER == BIG_ENDIAN |
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| 181 | u_int ipt_oflw:4, /* overflow counter */ |
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| 182 | ipt_flg:4; /* flags, see below */ |
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| 183 | #endif |
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| 184 | union ipt_timestamp { |
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| 185 | n_long ipt_time[1]; |
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| 186 | struct ipt_ta { |
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| 187 | struct in_addr ipt_addr; |
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| 188 | n_long ipt_time; |
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| 189 | } ipt_ta[1]; |
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| 190 | } ipt_timestamp; |
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| 191 | }; |
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| 192 | |
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| 193 | #include <machine/in_cksum.h> |
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| 194 | |
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| 195 | /* flag bits for ipt_flg */ |
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| 196 | #define IPOPT_TS_TSONLY 0 /* timestamps only */ |
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| 197 | #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ |
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| 198 | #define IPOPT_TS_PRESPEC 3 /* specified modules only */ |
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| 199 | |
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| 200 | /* bits for security (not byte swapped) */ |
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| 201 | #define IPOPT_SECUR_UNCLASS 0x0000 |
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| 202 | #define IPOPT_SECUR_CONFID 0xf135 |
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| 203 | #define IPOPT_SECUR_EFTO 0x789a |
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| 204 | #define IPOPT_SECUR_MMMM 0xbc4d |
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| 205 | #define IPOPT_SECUR_RESTR 0xaf13 |
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| 206 | #define IPOPT_SECUR_SECRET 0xd788 |
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| 207 | #define IPOPT_SECUR_TOPSECRET 0x6bc5 |
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| 208 | |
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| 209 | /* |
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| 210 | * Internet implementation parameters. |
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| 211 | */ |
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| 212 | #define MAXTTL 255 /* maximum time to live (seconds) */ |
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| 213 | #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ |
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| 214 | #define IPFRAGTTL 60 /* time to live for frags, slowhz */ |
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| 215 | #define IPTTLDEC 1 /* subtracted when forwarding */ |
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| 216 | |
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| 217 | #define IP_MSS 576 /* default maximum segment size */ |
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| 218 | |
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| 219 | /* |
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| 220 | * This is the real IPv4 pseudo header, used for computing the TCP and UDP |
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| 221 | * checksums. For the Internet checksum, struct ipovly can be used instead. |
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| 222 | * For stronger checksums, the real thing must be used. |
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| 223 | */ |
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| 224 | struct ippseudo { |
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| 225 | struct in_addr ippseudo_src; /* source internet address */ |
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| 226 | struct in_addr ippseudo_dst; /* destination internet address */ |
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| 227 | u_char ippseudo_pad; /* pad, must be zero */ |
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| 228 | u_char ippseudo_p; /* protocol */ |
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| 229 | u_short ippseudo_len; /* protocol length */ |
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| 230 | }; |
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| 231 | #endif |
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