| 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 | * 3. All advertising materials mentioning features or use of this software
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| 14 | * must display the following acknowledgement:
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| 15 | * This product includes software developed by the University of
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| 16 | * California, Berkeley and its contributors.
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| 17 | * 4. Neither the name of the University nor the names of its contributors
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| 18 | * may be used to endorse or promote products derived from this software
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| 19 | * without specific prior written permission.
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| 20 | *
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| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 31 | * SUCH DAMAGE.
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| 32 | *
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| 33 | * @(#)ip.h 8.1 (Berkeley) 6/10/93
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| 34 | * ip.h,v 1.3 1994/08/21 05:27:30 paul Exp
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| 35 | */
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| 36 |
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| 37 | #ifndef _IP_H_
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| 38 | #define _IP_H_
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| 39 |
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| 40 | #ifdef VBOX_WITH_BSD_REASS
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| 41 | # include "queue.h"
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| 42 | #endif
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| 43 |
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| 44 | #ifdef WORDS_BIGENDIAN
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| 45 | # ifndef NTOHL
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| 46 | # define NTOHL(d)
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| 47 | # endif
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| 48 | # ifndef NTOHS
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| 49 | # define NTOHS(d)
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| 50 | # endif
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| 51 | # ifndef HTONL
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| 52 | # define HTONL(d)
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| 53 | # endif
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| 54 | # ifndef HTONS
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| 55 | # define HTONS(d)
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| 56 | # endif
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| 57 | #else
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| 58 | # ifndef NTOHL
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| 59 | # define NTOHL(d) ((d) = ntohl((d)))
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| 60 | # endif
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| 61 | # ifndef NTOHS
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| 62 | # define NTOHS(d) ((d) = ntohs((u_int16_t)(d)))
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| 63 | # endif
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| 64 | # ifndef HTONL
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| 65 | # define HTONL(d) ((d) = htonl((d)))
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| 66 | # endif
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| 67 | # ifndef HTONS
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| 68 | # define HTONS(d) ((d) = htons((u_int16_t)(d)))
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| 69 | # endif
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| 70 | #endif
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| 71 |
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| 72 | typedef u_int32_t n_long; /* long as received from the net */
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| 73 |
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| 74 | /*
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| 75 | * Definitions for internet protocol version 4.
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| 76 | * Per RFC 791, September 1981.
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| 77 | */
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| 78 | #define IPVERSION 4
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| 79 |
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| 80 | /*
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| 81 | * Structure of an internet header, naked of options.
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| 82 | */
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| 83 | struct ip {
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| 84 | /*
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| 85 | * bitfield types must be u_int8_t for MSVC, otherwise it will use a full dword (for u_int)
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| 86 | */
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| 87 | #ifdef WORDS_BIGENDIAN
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| 88 | u_int ip_v:4, /* version */
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| 89 | ip_hl:4; /* header length */
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| 90 | #else
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| 91 | #ifdef _MSC_VER
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| 92 | u_int8_t ip_hl:4, /* header length */
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| 93 | #else
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| 94 | u_int ip_hl:4, /* header length */
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| 95 | #endif
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| 96 | ip_v:4; /* version */
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| 97 | #endif
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| 98 | u_int8_t ip_tos; /* type of service */
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| 99 | u_int16_t ip_len; /* total length */
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| 100 | u_int16_t ip_id; /* identification */
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| 101 | u_int16_t ip_off; /* fragment offset field */
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| 102 | #define IP_DF 0x4000 /* don't fragment flag */
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| 103 | #define IP_MF 0x2000 /* more fragments flag */
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| 104 | #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
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| 105 | u_int8_t ip_ttl; /* time to live */
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| 106 | u_int8_t ip_p; /* protocol */
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| 107 | u_int16_t ip_sum; /* checksum */
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| 108 | struct in_addr ip_src,ip_dst; /* source and dest address */
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| 109 | };
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| 110 |
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| 111 | #define IP_MAXPACKET 65535 /* maximum packet size */
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| 112 |
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| 113 | /*
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| 114 | * Definitions for IP type of service (ip_tos)
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| 115 | */
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| 116 | #define IPTOS_LOWDELAY 0x10
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| 117 | #define IPTOS_THROUGHPUT 0x08
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| 118 | #define IPTOS_RELIABILITY 0x04
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| 119 |
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| 120 | /*
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| 121 | * Definitions for options.
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| 122 | */
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| 123 | #define IPOPT_COPIED(o) ((o)&0x80)
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| 124 | #define IPOPT_CLASS(o) ((o)&0x60)
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| 125 | #define IPOPT_NUMBER(o) ((o)&0x1f)
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| 126 |
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| 127 | #define IPOPT_CONTROL 0x00
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| 128 | #define IPOPT_RESERVED1 0x20
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| 129 | #define IPOPT_DEBMEAS 0x40
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| 130 | #define IPOPT_RESERVED2 0x60
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| 131 |
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| 132 | #define IPOPT_EOL 0 /* end of option list */
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| 133 | #define IPOPT_NOP 1 /* no operation */
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| 134 |
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| 135 | #define IPOPT_RR 7 /* record packet route */
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| 136 | #define IPOPT_TS 68 /* timestamp */
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| 137 | #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
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| 138 | #define IPOPT_LSRR 131 /* loose source route */
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| 139 | #define IPOPT_SATID 136 /* satnet id */
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| 140 | #define IPOPT_SSRR 137 /* strict source route */
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| 141 |
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| 142 | /*
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| 143 | * Offsets to fields in options other than EOL and NOP.
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| 144 | */
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| 145 | #define IPOPT_OPTVAL 0 /* option ID */
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| 146 | #define IPOPT_OLEN 1 /* option length */
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| 147 | #define IPOPT_OFFSET 2 /* offset within option */
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| 148 | #define IPOPT_MINOFF 4 /* min value of above */
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| 149 |
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| 150 | /*
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| 151 | * Time stamp option structure.
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| 152 | */
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| 153 | struct ip_timestamp {
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| 154 | u_int8_t ipt_code; /* IPOPT_TS */
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| 155 | u_int8_t ipt_len; /* size of structure (variable) */
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| 156 | u_int8_t ipt_ptr; /* index of current entry */
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| 157 | /*
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| 158 | * bitfield types must be u_int8_t for MSVC, otherwise it will use a full dword (for u_int)
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| 159 | */
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| 160 | #ifdef WORDS_BIGENDIAN
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| 161 | u_int ipt_oflw:4, /* overflow counter */
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| 162 | ipt_flg:4; /* flags, see below */
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| 163 | #else
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| 164 | #ifdef _MSC_VER
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| 165 | u_int8_t ipt_flg:4, /* flags, see below */
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| 166 | #else
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| 167 | u_int ipt_flg:4, /* flags, see below */
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| 168 | #endif
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| 169 | ipt_oflw:4; /* overflow counter */
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| 170 | #endif
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| 171 | union ipt_timestamp {
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| 172 | n_long ipt_time[1];
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| 173 | struct ipt_ta {
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| 174 | struct in_addr ipt_addr;
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| 175 | n_long ipt_time;
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| 176 | } ipt_ta[1];
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| 177 | } ipt_timestamp;
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| 178 | };
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| 179 |
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| 180 | /* flag bits for ipt_flg */
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| 181 | #define IPOPT_TS_TSONLY 0 /* timestamps only */
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| 182 | #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
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| 183 | #define IPOPT_TS_PRESPEC 3 /* specified modules only */
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| 184 |
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| 185 | /* bits for security (not byte swapped) */
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| 186 | #define IPOPT_SECUR_UNCLASS 0x0000
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| 187 | #define IPOPT_SECUR_CONFID 0xf135
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| 188 | #define IPOPT_SECUR_EFTO 0x789a
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| 189 | #define IPOPT_SECUR_MMMM 0xbc4d
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| 190 | #define IPOPT_SECUR_RESTR 0xaf13
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| 191 | #define IPOPT_SECUR_SECRET 0xd788
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| 192 | #define IPOPT_SECUR_TOPSECRET 0x6bc5
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| 193 |
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| 194 | /*
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| 195 | * Internet implementation parameters.
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| 196 | */
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| 197 | #define MAXTTL 255 /* maximum time to live (seconds) */
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| 198 | #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
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| 199 | #define IPFRAGTTL 60 /* time to live for frags, slowhz */
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| 200 | #define IPTTLDEC 1 /* subtracted when forwarding */
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| 201 |
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| 202 | #define IP_MSS 576 /* default maximum segment size */
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| 203 |
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| 204 | #ifdef HAVE_SYS_TYPES32_H /* Overcome some Solaris 2.x junk */
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| 205 | # include <sys/types32.h>
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| 206 | #else
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| 207 | # if SIZEOF_CHAR_P == 4
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| 208 | typedef caddr_t caddr32_t;
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| 209 | # else
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| 210 | # if !defined(VBOX_WITH_BSD_REASS)
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| 211 | typedef u_int32_t caddr32_t;
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| 212 | # else /* VBOX_WITH_BSD_REASS */
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| 213 | typedef caddr_t caddr32_t;
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| 214 | # endif /* VBOX_WITH_BSD_REASS */
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| 215 | # endif
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| 216 | #endif
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| 217 |
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| 218 | #if SIZEOF_CHAR_P == 4
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| 219 | typedef struct ipq_t *ipqp_32;
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| 220 | typedef struct ipasfrag *ipasfragp_32;
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| 221 | #else
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| 222 | typedef caddr32_t ipqp_32;
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| 223 | typedef caddr32_t ipasfragp_32;
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| 224 | #endif
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| 225 |
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| 226 | /*
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| 227 | * Overlay for ip header used by other protocols (tcp, udp).
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| 228 | */
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| 229 | struct ipovly {
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| 230 | #if !defined(VBOX_WITH_BSD_REASS)
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| 231 | caddr32_t ih_next, ih_prev; /* for protocol sequence q's */
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| 232 | u_int8_t ih_x1; /* (unused) */
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| 233 | #else /* VBOX_WITH_BSD_REASS */
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| 234 | u_int8_t ih_x1[9]; /* (unused) */
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| 235 | #endif /* VBOX_WITH_BSD_REASS */
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| 236 | u_int8_t ih_pr; /* protocol */
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| 237 | u_int16_t ih_len; /* protocol length */
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| 238 | struct in_addr ih_src; /* source internet address */
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| 239 | struct in_addr ih_dst; /* destination internet address */
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| 240 | };
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| 241 |
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| 242 | /*
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| 243 | * Ip reassembly queue structure. Each fragment
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| 244 | * being reassembled is attached to one of these structures.
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| 245 | * They are timed out after ipq_ttl drops to 0, and may also
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| 246 | * be reclaimed if memory becomes tight.
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| 247 | * size 28 bytes
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| 248 | */
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| 249 | struct ipq_t {
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| 250 | #ifndef VBOX_WITH_BSD_REASS
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| 251 | ipqp_32 next,prev; /* to other reass headers */
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| 252 | #else /* VBOX_WITH_BSD_REASS */
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| 253 | TAILQ_ENTRY(ipq_t) ipq_list;
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| 254 | #endif /* VBOX_WITH_BSD_REASS */
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| 255 | u_int8_t ipq_ttl; /* time for reass q to live */
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| 256 | u_int8_t ipq_p; /* protocol of this fragment */
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| 257 | u_int16_t ipq_id; /* sequence id for reassembly */
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| 258 | #ifndef VBOX_WITH_BSD_REASS
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| 259 | ipasfragp_32 ipq_next,ipq_prev; /* to ip headers of fragments */
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| 260 | #else /* VBOX_WITH_BSD_REASS */
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| 261 | u_int8_t ipq_nfrags; /* # of fragments in this packet */
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| 262 | struct mbuf *ipq_frags; /* to ip headers of fragments */
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| 263 | #endif /* VBOX_WITH_BSD_REASS */
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| 264 |
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| 265 | struct in_addr ipq_src,ipq_dst;
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| 266 | };
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| 267 |
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| 268 | #ifdef VBOX_WITH_BSD_REASS
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| 269 | /*
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| 270 | * IP datagram reassembly.
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| 271 | */
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| 272 | #define IPREASS_NHASH_LOG2 6
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| 273 | #define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2)
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| 274 | #define IPREASS_HMASK (IPREASS_NHASH - 1)
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| 275 | #define IPREASS_HASH(x,y) \
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| 276 | (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
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| 277 | TAILQ_HEAD(ipqhead,ipq_t);
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| 278 | #endif /* VBOX_WITH_BSD_REASS */
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| 279 |
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| 280 | /*
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| 281 | * Ip header, when holding a fragment.
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| 282 | *
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| 283 | * Note: ipf_next must be at same offset as ipq_next above
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| 284 | */
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| 285 | struct ipasfrag {
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| 286 | #ifdef WORDS_BIGENDIAN
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| 287 | u_int ip_v:4,
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| 288 | ip_hl:4;
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| 289 | #else
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| 290 | #ifdef _MSC_VER
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| 291 | u_int8_t ip_hl:4,
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| 292 | #else
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| 293 | u_int ip_hl:4,
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| 294 | #endif
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| 295 | ip_v:4;
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| 296 | #endif
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| 297 | /* BUG : u_int changed to u_int8_t.
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| 298 | * sizeof(u_int)==4 on linux 2.0
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| 299 | */
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| 300 | u_int8_t ipf_mff; /* XXX overlays ip_tos: use low bit
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| 301 | * to avoid destroying tos (PPPDTRuu);
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| 302 | * copied from (ip_off&IP_MF) */
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| 303 | u_int16_t ip_len;
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| 304 | u_int16_t ip_id;
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| 305 | u_int16_t ip_off;
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| 306 | u_int8_t ip_ttl;
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| 307 | u_int8_t ip_p;
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| 308 | u_int16_t ip_sum;
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| 309 | ipasfragp_32 ipf_next; /* next fragment */
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| 310 | ipasfragp_32 ipf_prev; /* previous fragment */
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| 311 | };
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| 312 |
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| 313 | /*
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| 314 | * Structure stored in mbuf in inpcb.ip_options
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| 315 | * and passed to ip_output when ip options are in use.
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| 316 | * The actual length of the options (including ipopt_dst)
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| 317 | * is in m_len.
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| 318 | */
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| 319 | #define MAX_IPOPTLEN 40
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| 320 |
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| 321 | struct ipoption {
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| 322 | struct in_addr ipopt_dst; /* first-hop dst if source routed */
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| 323 | int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */
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| 324 | };
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| 325 |
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| 326 | /*
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| 327 | * Structure attached to inpcb.ip_moptions and
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| 328 | * passed to ip_output when IP multicast options are in use.
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| 329 | */
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| 330 |
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| 331 | struct ipstat_t {
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| 332 | u_long ips_total; /* total packets received */
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| 333 | u_long ips_badsum; /* checksum bad */
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| 334 | u_long ips_tooshort; /* packet too short */
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| 335 | u_long ips_toosmall; /* not enough data */
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| 336 | u_long ips_badhlen; /* ip header length < data size */
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| 337 | u_long ips_badlen; /* ip length < ip header length */
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| 338 | u_long ips_fragments; /* fragments received */
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| 339 | u_long ips_fragdropped; /* frags dropped (dups, out of space) */
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| 340 | u_long ips_fragtimeout; /* fragments timed out */
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| 341 | u_long ips_forward; /* packets forwarded */
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| 342 | u_long ips_cantforward; /* packets rcvd for unreachable dest */
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| 343 | u_long ips_redirectsent; /* packets forwarded on same net */
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| 344 | u_long ips_noproto; /* unknown or unsupported protocol */
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| 345 | u_long ips_delivered; /* datagrams delivered to upper level*/
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| 346 | u_long ips_localout; /* total ip packets generated here */
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| 347 | u_long ips_odropped; /* lost packets due to nobufs, etc. */
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| 348 | u_long ips_reassembled; /* total packets reassembled ok */
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| 349 | u_long ips_fragmented; /* datagrams successfully fragmented */
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| 350 | u_long ips_ofragments; /* output fragments created */
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| 351 | u_long ips_cantfrag; /* don't fragment flag was set, etc. */
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| 352 | u_long ips_badoptions; /* error in option processing */
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| 353 | u_long ips_noroute; /* packets discarded due to no route */
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| 354 | u_long ips_badvers; /* ip version != 4 */
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| 355 | u_long ips_rawout; /* total raw ip packets generated */
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| 356 | u_long ips_unaligned; /* times the ip packet was not aligned */
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| 357 | };
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| 358 |
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| 359 |
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| 360 | #endif
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