sys/netinet/ip.h

   1 /*
   2  * Copyright (c) 1982, 1986, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)ip.h        8.2 (Berkeley) 6/1/94
  34  * $FreeBSD: src/sys/netinet/ip.h,v 1.17 1999/12/22 19:13:20 shin Exp $
  35  */
  36
  37 #ifndef _NETINET_IP_H_
  38 #define _NETINET_IP_H_
  39
  40 #ifndef _SYS_TYPES_H_
  41 #include <sys/types.h>
  42 #endif
  43 #ifndef _NETINET_IN_H_
  44 #include <netinet/in.h>
  45 #endif
  46 #ifndef _NETINET_IN_SYSTM_H_
  47 #include <netinet/in_systm.h>
  48 #endif
  49 #include <machine/endian.h>
  50
  51 /*
  52  * Definitions for internet protocol version 4.
  53  * Per RFC 791, September 1981.
  54  */
  55 #define IPVERSION       4
  56
  57 /*
  58  * Structure of an internet header, naked of options.
  59  */
  60 struct ip {
  61 #ifdef _IP_VHL
  62         u_char  ip_vhl;                 /* version << 4 | header length >> 2 */
  63 #elif _BYTE_ORDER == _LITTLE_ENDIAN
  64         u_int   ip_hl:4,                /* header length */
  65                 ip_v:4;                 /* version */
  66 #elif _BYTE_ORDER == _BIG_ENDIAN
  67         u_int   ip_v:4,                 /* version */
  68                 ip_hl:4;                /* header length */
  69 #else
  70 #error "Byte order not implemented"
  71 #endif
  72         u_char  ip_tos;                 /* type of service */
  73         u_short ip_len;                 /* total length */
  74         u_short ip_id;                  /* identification */
  75         u_short ip_off;                 /* fragment offset field */
  76 #define IP_RF 0x8000                    /* reserved fragment flag */
  77 #define IP_DF 0x4000                    /* dont fragment flag */
  78 #define IP_MF 0x2000                    /* more fragments flag */
  79 #define IP_OFFMASK 0x1fff               /* mask for fragmenting bits */
  80         u_char  ip_ttl;                 /* time to live */
  81         u_char  ip_p;                   /* protocol */
  82         u_short ip_sum;                 /* checksum */
  83         struct  in_addr ip_src,ip_dst;  /* source and dest address */
  84 };
  85
  86 #ifdef _IP_VHL
  87 #define IP_MAKE_VHL(v, hl)      ((v) << 4 | (hl))
  88 #define IP_VHL_HL(vhl)          ((vhl) & 0x0f)
  89 #define IP_VHL_V(vhl)           ((vhl) >> 4)
  90 #define IP_VHL_BORING           0x45
  91 #endif
  92
  93 #define IP_MAXPACKET    65535           /* maximum packet size */
  94
  95 /*
  96  * Definitions for IP type of service (ip_tos)
  97  */
  98 #define IPTOS_LOWDELAY          0x10
  99 #define IPTOS_THROUGHPUT        0x08
 100 #define IPTOS_RELIABILITY       0x04
 101 #define IPTOS_MINCOST           0x02
 102 #if 1
 103 /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */
 104 #define IPTOS_CE                0x01    /* congestion experienced */
 105 #define IPTOS_ECT               0x02    /* ECN-capable transport */
 106 #endif
 107
 108
 109 /*
 110  * Definitions for IP precedence (also in ip_tos) (hopefully unused)
 111  */
 112 #define IPTOS_PREC_NETCONTROL           0xe0
 113 #define IPTOS_PREC_INTERNETCONTROL      0xc0
 114 #define IPTOS_PREC_CRITIC_ECP           0xa0
 115 #define IPTOS_PREC_FLASHOVERRIDE        0x80
 116 #define IPTOS_PREC_FLASH                0x60
 117 #define IPTOS_PREC_IMMEDIATE            0x40
 118 #define IPTOS_PREC_PRIORITY             0x20
 119 #define IPTOS_PREC_ROUTINE              0x00
 120
 121 /*
 122  * ECN (Explicit Congestion Notification) codepoints in RFC3168
 123  * mapped to the lower 2 bits of the TOS field.
 124  */
 125 #define IPTOS_ECN_NOTECT        0x00    /* not-ECT */
 126 #define IPTOS_ECN_ECT1          0x01    /* ECN-capable transport (1) */
 127 #define IPTOS_ECN_ECT0          0x02    /* ECN-capable transport (0) */
 128 #define IPTOS_ECN_CE            0x03    /* congestion experienced */
 129 #define IPTOS_ECN_MASK          0x03    /* ECN field mask */
 130
 131 /*
 132  * Definitions for options.
 133  */
 134 #define IPOPT_COPIED(o)         ((o)&0x80)
 135 #define IPOPT_CLASS(o)          ((o)&0x60)
 136 #define IPOPT_NUMBER(o)         ((o)&0x1f)
 137
 138 #define IPOPT_CONTROL           0x00
 139 #define IPOPT_RESERVED1         0x20
 140 #define IPOPT_DEBMEAS           0x40
 141 #define IPOPT_RESERVED2         0x60
 142
 143 #define IPOPT_EOL               0               /* end of option list */
 144 #define IPOPT_NOP               1               /* no operation */
 145
 146 #define IPOPT_RR                7               /* record packet route */
 147 #define IPOPT_TS                68              /* timestamp */
 148 #define IPOPT_SECURITY          130             /* provide s,c,h,tcc */
 149 #define IPOPT_LSRR              131             /* loose source route */
 150 #define IPOPT_SATID             136             /* satnet id */
 151 #define IPOPT_SSRR              137             /* strict source route */
 152 #define IPOPT_RA                148             /* router alert */
 153
 154 /*
 155  * Offsets to fields in options other than EOL and NOP.
 156  */
 157 #define IPOPT_OPTVAL            0               /* option ID */
 158 #define IPOPT_OLEN              1               /* option length */
 159 #define IPOPT_OFFSET            2               /* offset within option */
 160 #define IPOPT_MINOFF            4               /* min value of above */
 161
 162 /*
 163  * Time stamp option structure.
 164  */
 165 struct  ip_timestamp {
 166         u_char  ipt_code;               /* IPOPT_TS */
 167         u_char  ipt_len;                /* size of structure (variable) */
 168         u_char  ipt_ptr;                /* index of current entry */
 169 #if _BYTE_ORDER == _LITTLE_ENDIAN
 170         u_int   ipt_flg:4,              /* flags, see below */
 171                 ipt_oflw:4;             /* overflow counter */
 172 #elif _BYTE_ORDER == _BIG_ENDIAN
 173         u_int   ipt_oflw:4,             /* overflow counter */
 174                 ipt_flg:4;              /* flags, see below */
 175 #else
 176 #error "Byte order not implemented"
 177 #endif
 178         union ipt_timestamp {
 179                 n_long  ipt_time[1];
 180                 struct  ipt_ta {
 181                         struct in_addr ipt_addr;
 182                         n_long ipt_time;
 183                 } ipt_ta[1];
 184         } ipt_timestamp;
 185 };
 186
 187 /* flag bits for ipt_flg */
 188 #define IPOPT_TS_TSONLY         0               /* timestamps only */
 189 #define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
 190 #define IPOPT_TS_PRESPEC        3               /* specified modules only */
 191
 192 /* bits for security (not byte swapped) */
 193 #define IPOPT_SECUR_UNCLASS     0x0000
 194 #define IPOPT_SECUR_CONFID      0xf135
 195 #define IPOPT_SECUR_EFTO        0x789a
 196 #define IPOPT_SECUR_MMMM        0xbc4d
 197 #define IPOPT_SECUR_RESTR       0xaf13
 198 #define IPOPT_SECUR_SECRET      0xd788
 199 #define IPOPT_SECUR_TOPSECRET   0x6bc5
 200
 201 /*
 202  * Internet implementation parameters.
 203  */
 204 #define MAXTTL          255             /* maximum time to live (seconds) */
 205 #define IPDEFTTL        64              /* default ttl, from RFC 1340 */
 206 #define IPFRAGTTL       60              /* time to live for frags, slowhz */
 207 #define IPTTLDEC        1               /* subtracted when forwarding */
 208
 209 #define IP_MSS          576             /* default maximum segment size */
 210
 211 /*
 212  * This is the real IPv4 pseudo header, used for computing the TCP and UDP
 213  * checksums. For the Internet checksum, struct ipovly can be used instead.
 214  * For stronger checksums, the real thing must be used.
 215  */
 216 struct ippseudo {
 217         struct  in_addr ippseudo_src;   /* source internet address */
 218         struct  in_addr ippseudo_dst;   /* destination internet address */
 219         u_int8_t        ippseudo_pad;   /* pad, must be zero */
 220         u_int8_t        ippseudo_p;     /* protocol */
 221         u_int16_t       ippseudo_len;   /* protocol length */
 222 } __packed;
 223 #endif