usr/src/boot/include/netinet/ip.h

   1 /*-
   2  * Copyright (c) 1982, 1986, 1993
   3  *      The Regents of the University of California.
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 4. Neither the name of the University nor the names of its contributors
  15  *    may be used to endorse or promote products derived from this software
  16  *    without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  *
  30  *      @(#)ip.h        8.2 (Berkeley) 6/1/94
  31  * $FreeBSD$
  32  */
  33
  34 #ifndef _NETINET_IP_H_
  35 #define _NETINET_IP_H_
  36
  37 #include <sys/cdefs.h>
  38
  39 /*
  40  * Definitions for internet protocol version 4.
  41  *
  42  * Per RFC 791, September 1981.
  43  */
  44 #define IPVERSION       4
  45
  46 /*
  47  * Structure of an internet header, naked of options.
  48  */
  49 struct ip {
  50 #if BYTE_ORDER == LITTLE_ENDIAN
  51         u_char  ip_hl:4,                /* header length */
  52                 ip_v:4;                 /* version */
  53 #endif
  54 #if BYTE_ORDER == BIG_ENDIAN
  55         u_char  ip_v:4,                 /* version */
  56                 ip_hl:4;                /* header length */
  57 #endif
  58         u_char  ip_tos;                 /* type of service */
  59         u_short ip_len;                 /* total length */
  60         u_short ip_id;                  /* identification */
  61         u_short ip_off;                 /* fragment offset field */
  62 #define IP_RF 0x8000                    /* reserved fragment flag */
  63 #define IP_DF 0x4000                    /* dont fragment flag */
  64 #define IP_MF 0x2000                    /* more fragments flag */
  65 #define IP_OFFMASK 0x1fff               /* mask for fragmenting bits */
  66         u_char  ip_ttl;                 /* time to live */
  67         u_char  ip_p;                   /* protocol */
  68         u_short ip_sum;                 /* checksum */
  69         struct  in_addr ip_src,ip_dst;  /* source and dest address */
  70 } __packed __aligned(2);
  71
  72 #define IP_MAXPACKET    65535           /* maximum packet size */
  73
  74 /*
  75  * Definitions for IP type of service (ip_tos).
  76  */
  77 #define IPTOS_LOWDELAY          0x10
  78 #define IPTOS_THROUGHPUT        0x08
  79 #define IPTOS_RELIABILITY       0x04
  80 #define IPTOS_MINCOST           0x02
  81
  82 /*
  83  * Definitions for IP precedence (also in ip_tos) (deprecated).
  84  */
  85 #define IPTOS_PREC_NETCONTROL           IPTOS_DSCP_CS7
  86 #define IPTOS_PREC_INTERNETCONTROL      IPTOS_DSCP_CS6
  87 #define IPTOS_PREC_CRITIC_ECP           IPTOS_DSCP_CS5
  88 #define IPTOS_PREC_FLASHOVERRIDE        IPTOS_DSCP_CS4
  89 #define IPTOS_PREC_FLASH                IPTOS_DSCP_CS3
  90 #define IPTOS_PREC_IMMEDIATE            IPTOS_DSCP_CS2
  91 #define IPTOS_PREC_PRIORITY             IPTOS_DSCP_CS1
  92 #define IPTOS_PREC_ROUTINE              IPTOS_DSCP_CS0
  93
  94 /*
  95  * Definitions for DiffServ Codepoints as per RFC2474 and RFC5865.
  96  */
  97 #define IPTOS_DSCP_CS0          0x00
  98 #define IPTOS_DSCP_CS1          0x20
  99 #define IPTOS_DSCP_AF11         0x28
 100 #define IPTOS_DSCP_AF12         0x30
 101 #define IPTOS_DSCP_AF13         0x38
 102 #define IPTOS_DSCP_CS2          0x40
 103 #define IPTOS_DSCP_AF21         0x48
 104 #define IPTOS_DSCP_AF22         0x50
 105 #define IPTOS_DSCP_AF23         0x58
 106 #define IPTOS_DSCP_CS3          0x60
 107 #define IPTOS_DSCP_AF31         0x68
 108 #define IPTOS_DSCP_AF32         0x70
 109 #define IPTOS_DSCP_AF33         0x78
 110 #define IPTOS_DSCP_CS4          0x80
 111 #define IPTOS_DSCP_AF41         0x88
 112 #define IPTOS_DSCP_AF42         0x90
 113 #define IPTOS_DSCP_AF43         0x98
 114 #define IPTOS_DSCP_CS5          0xa0
 115 #define IPTOS_DSCP_VA           0xb0
 116 #define IPTOS_DSCP_EF           0xb8
 117 #define IPTOS_DSCP_CS6          0xc0
 118 #define IPTOS_DSCP_CS7          0xe0
 119
 120 /*
 121  * ECN (Explicit Congestion Notification) codepoints in RFC3168 mapped to the
 122  * lower 2 bits of the TOS field.
 123  */
 124 #define IPTOS_ECN_NOTECT        0x00    /* not-ECT */
 125 #define IPTOS_ECN_ECT1          0x01    /* ECN-capable transport (1) */
 126 #define IPTOS_ECN_ECT0          0x02    /* ECN-capable transport (0) */
 127 #define IPTOS_ECN_CE            0x03    /* congestion experienced */
 128 #define IPTOS_ECN_MASK          0x03    /* ECN field mask */
 129
 130 /*
 131  * Definitions for options.
 132  */
 133 #define IPOPT_COPIED(o)         ((o)&0x80)
 134 #define IPOPT_CLASS(o)          ((o)&0x60)
 135 #define IPOPT_NUMBER(o)         ((o)&0x1f)
 136
 137 #define IPOPT_CONTROL           0x00
 138 #define IPOPT_RESERVED1         0x20
 139 #define IPOPT_DEBMEAS           0x40
 140 #define IPOPT_RESERVED2         0x60
 141
 142 #define IPOPT_EOL               0               /* end of option list */
 143 #define IPOPT_NOP               1               /* no operation */
 144
 145 #define IPOPT_RR                7               /* record packet route */
 146 #define IPOPT_TS                68              /* timestamp */
 147 #define IPOPT_SECURITY          130             /* provide s,c,h,tcc */
 148 #define IPOPT_LSRR              131             /* loose source route */
 149 #define IPOPT_ESO               133             /* extended security */
 150 #define IPOPT_CIPSO             134             /* commerical security */
 151 #define IPOPT_SATID             136             /* satnet id */
 152 #define IPOPT_SSRR              137             /* strict source route */
 153 #define IPOPT_RA                148             /* router alert */
 154
 155 /*
 156  * Offsets to fields in options other than EOL and NOP.
 157  */
 158 #define IPOPT_OPTVAL            0               /* option ID */
 159 #define IPOPT_OLEN              1               /* option length */
 160 #define IPOPT_OFFSET            2               /* offset within option */
 161 #define IPOPT_MINOFF            4               /* min value of above */
 162
 163 /*
 164  * Time stamp option structure.
 165  */
 166 struct  ip_timestamp {
 167         u_char  ipt_code;               /* IPOPT_TS */
 168         u_char  ipt_len;                /* size of structure (variable) */
 169         u_char  ipt_ptr;                /* index of current entry */
 170 #if BYTE_ORDER == LITTLE_ENDIAN
 171         u_char  ipt_flg:4,              /* flags, see below */
 172                 ipt_oflw:4;             /* overflow counter */
 173 #endif
 174 #if BYTE_ORDER == BIG_ENDIAN
 175         u_char  ipt_oflw:4,             /* overflow counter */
 176                 ipt_flg:4;              /* flags, see below */
 177 #endif
 178         union ipt_timestamp {
 179                 uint32_t        ipt_time[1];    /* network format */
 180                 struct  ipt_ta {
 181                         struct in_addr ipt_addr;
 182                         uint32_t ipt_time;      /* network format */
 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 #define IP_MSS          576             /* default maximum segment size */
 209
 210 /*
 211  * This is the real IPv4 pseudo header, used for computing the TCP and UDP
 212  * checksums. For the Internet checksum, struct ipovly can be used instead.
 213  * For stronger checksums, the real thing must be used.
 214  */
 215 struct ippseudo {
 216         struct  in_addr ippseudo_src;   /* source internet address */
 217         struct  in_addr ippseudo_dst;   /* destination internet address */
 218         u_char          ippseudo_pad;   /* pad, must be zero */
 219         u_char          ippseudo_p;     /* protocol */
 220         u_short         ippseudo_len;   /* protocol length */
 221 };
 222 #endif