vde-2/src/slirpvde/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        8.1 (Berkeley) 6/10/93
  34  * ip.h,v 1.3 1994/08/21 05:27:30 paul Exp
  35  */
  36
  37 #ifndef _IP_H_
  38 #define _IP_H_
  39
  40 #ifndef __BYTE_ORDER
  41 #if defined(VDE_DARWIN) || defined(VDE_FREEBSD)
  42 #include <machine/endian.h>
  43 #define __BYTE_ORDER _BYTE_ORDER
  44 #define __BIG_ENDIAN __BIG_ENDIAN
  45 #define __LITTLE_ENDIAN _LITTLE_ENDIAN
  46 #endif
  47 #endif
  48
  49 #if __BYTE_ORDER == __BIG_ENDIAN
  50 # ifndef NTOHL
  51 #  define NTOHL(d)
  52 # endif
  53 # ifndef NTOHS
  54 #  define NTOHS(d)
  55 # endif
  56 # ifndef HTONL
  57 #  define HTONL(d)
  58 # endif
  59 # ifndef HTONS
  60 #  define HTONS(d)
  61 # endif
  62 #else
  63 # ifndef NTOHL
  64 #  define NTOHL(d) ((d) = ntohl((d)))
  65 # endif
  66 # ifndef NTOHS
  67 #  define NTOHS(d) ((d) = ntohs((u_int16_t)(d)))
  68 # endif
  69 # ifndef HTONL
  70 #  define HTONL(d) ((d) = htonl((d)))
  71 # endif
  72 # ifndef HTONS
  73 #  define HTONS(d) ((d) = htons((u_int16_t)(d)))
  74 # endif
  75 #endif
  76
  77 typedef u_int32_t n_long;                 /* long as received from the net */
  78
  79 /*
  80  * Definitions for internet protocol version 4.
  81  * Per RFC 791, September 1981.
  82  */
  83 #define IPVERSION       4
  84
  85 /*
  86  * Structure of an internet header, naked of options.
  87  *
  88  * We declare ip_len and ip_off to be short, rather than u_short
  89  * pragmatically since otherwise unsigned comparisons can result
  90  * against negative integers quite easily, and fail in subtle ways.
  91  */
  92 struct ip {
  93 #if __BYTE_ORDER == __BIG_ENDIAN
  94         u_int ip_v:4,                   /* version */
  95                 ip_hl:4;                /* header length */
  96 #else
  97         u_int ip_hl:4,          /* header length */
  98                 ip_v:4;                 /* version */
  99 #endif
 100         u_int8_t ip_tos;                        /* type of service */
 101         int16_t ip_len;                 /* total length */
 102         u_int16_t       ip_id;                  /* identification */
 103         int16_t ip_off;                 /* fragment offset field */
 104 #define IP_DF 0x4000                    /* don't fragment flag */
 105 #define IP_MF 0x2000                    /* more fragments flag */
 106 #define IP_OFFMASK 0x1fff               /* mask for fragmenting bits */
 107         u_int8_t ip_ttl;                        /* time to live */
 108         u_int8_t ip_p;                  /* protocol */
 109         u_int16_t       ip_sum;                 /* checksum */
 110         struct  in_addr ip_src,ip_dst;  /* source and dest address */
 111 };
 112
 113 #define IP_MAXPACKET    65535           /* maximum packet size */
 114
 115 /*
 116  * Definitions for IP type of service (ip_tos)
 117  */
 118 #define IPTOS_LOWDELAY          0x10
 119 #define IPTOS_THROUGHPUT        0x08
 120 #define IPTOS_RELIABILITY       0x04
 121
 122 /*
 123  * Definitions for options.
 124  */
 125 #define IPOPT_COPIED(o)         ((o)&0x80)
 126 #define IPOPT_CLASS(o)          ((o)&0x60)
 127 #define IPOPT_NUMBER(o)         ((o)&0x1f)
 128
 129 #define IPOPT_CONTROL           0x00
 130 #define IPOPT_RESERVED1         0x20
 131 #define IPOPT_DEBMEAS           0x40
 132 #define IPOPT_RESERVED2         0x60
 133
 134 #define IPOPT_EOL               0               /* end of option list */
 135 #define IPOPT_NOP               1               /* no operation */
 136
 137 #define IPOPT_RR                7               /* record packet route */
 138 #define IPOPT_TS                68              /* timestamp */
 139 #define IPOPT_SECURITY          130             /* provide s,c,h,tcc */
 140 #define IPOPT_LSRR              131             /* loose source route */
 141 #define IPOPT_SATID             136             /* satnet id */
 142 #define IPOPT_SSRR              137             /* strict source route */
 143
 144 /*
 145  * Offsets to fields in options other than EOL and NOP.
 146  */
 147 #define IPOPT_OPTVAL            0               /* option ID */
 148 #define IPOPT_OLEN              1               /* option length */
 149 #define IPOPT_OFFSET            2               /* offset within option */
 150 #define IPOPT_MINOFF            4               /* min value of above */
 151
 152 /*
 153  * Time stamp option structure.
 154  */
 155 struct  ip_timestamp {
 156         u_int8_t        ipt_code;               /* IPOPT_TS */
 157         u_int8_t        ipt_len;                /* size of structure (variable) */
 158         u_int8_t        ipt_ptr;                /* index of current entry */
 159 #if __BYTE_ORDER == __BIG_ENDIAN
 160         u_int   ipt_oflw:4,             /* overflow counter */
 161                 ipt_flg:4;              /* flags, see below */
 162 #else
 163         u_int   ipt_flg:4,              /* flags, see below */
 164                 ipt_oflw:4;             /* overflow counter */
 165 #endif
 166         union ipt_timestamp {
 167                 n_long  ipt_time[1];
 168                 struct  ipt_ta {
 169                         struct in_addr ipt_addr;
 170                         n_long ipt_time;
 171                 } ipt_ta[1];
 172         } ipt_timestamp;
 173 };
 174
 175 /* flag bits for ipt_flg */
 176 #define IPOPT_TS_TSONLY         0               /* timestamps only */
 177 #define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
 178 #define IPOPT_TS_PRESPEC        3               /* specified modules only */
 179
 180 /* bits for security (not byte swapped) */
 181 #define IPOPT_SECUR_UNCLASS     0x0000
 182 #define IPOPT_SECUR_CONFID      0xf135
 183 #define IPOPT_SECUR_EFTO        0x789a
 184 #define IPOPT_SECUR_MMMM        0xbc4d
 185 #define IPOPT_SECUR_RESTR       0xaf13
 186 #define IPOPT_SECUR_SECRET      0xd788
 187 #define IPOPT_SECUR_TOPSECRET   0x6bc5
 188
 189 /*
 190  * Internet implementation parameters.
 191  */
 192 #define MAXTTL          255             /* maximum time to live (seconds) */
 193 #define IPDEFTTL        64              /* default ttl, from RFC 1340 */
 194 #define IPFRAGTTL       60              /* time to live for frags, slowhz */
 195 #define IPTTLDEC        1               /* subtracted when forwarding */
 196
 197 #define IP_MSS          576             /* default maximum segment size */
 198
 199 #ifdef HAVE_SYS_TYPES32_H  /* Overcome some Solaris 2.x junk */
 200 #include <sys/types32.h>
 201 #else
 202 #if SIZEOF_CHAR_P == 4
 203 typedef caddr_t caddr32_t;
 204 #else
 205 typedef u_int32_t caddr32_t;
 206 #endif
 207 #endif
 208
 209 #if SIZEOF_CHAR_P == 4
 210 typedef struct ipq *ipqp_32;
 211 typedef struct ipasfrag *ipasfragp_32;
 212 #else
 213 typedef caddr32_t ipqp_32;
 214 typedef caddr32_t ipasfragp_32;
 215 #endif
 216
 217 /*
 218  * Overlay for ip header used by other protocols (tcp, udp).
 219  */
 220 struct ipovly {
 221         caddr32_t       ih_next, ih_prev;       /* for protocol sequence q's */
 222         u_int8_t        ih_x1;                  /* (unused) */
 223         u_int8_t        ih_pr;                  /* protocol */
 224         int16_t ih_len;                 /* protocol length */
 225         struct  in_addr ih_src;         /* source internet address */
 226         struct  in_addr ih_dst;         /* destination internet address */
 227 };
 228
 229 /*
 230  * Ip reassembly queue structure.  Each fragment
 231  * being reassembled is attached to one of these structures.
 232  * They are timed out after ipq_ttl drops to 0, and may also
 233  * be reclaimed if memory becomes tight.
 234  * size 28 bytes
 235  */
 236 struct ipq {
 237         ipqp_32 next,prev;      /* to other reass headers */
 238         u_int8_t        ipq_ttl;                /* time for reass q to live */
 239         u_int8_t        ipq_p;                  /* protocol of this fragment */
 240         u_int16_t       ipq_id;                 /* sequence id for reassembly */
 241         ipasfragp_32 ipq_next,ipq_prev;
 242                                         /* to ip headers of fragments */
 243         struct  in_addr ipq_src,ipq_dst;
 244 };
 245
 246 /*
 247  * Ip header, when holding a fragment.
 248  *
 249  * Note: ipf_next must be at same offset as ipq_next above
 250  */
 251 struct  ipasfrag {
 252 #if      __BYTE_ORDER == __BIG_ENDIAN
 253         u_int   ip_v:4,
 254                 ip_hl:4;
 255 #else
 256         u_int   ip_hl:4,
 257                 ip_v:4;
 258 #endif
 259                                         /* BUG : u_int changed to u_int8_t.
 260                                          * sizeof(u_int)==4 on linux 2.0
 261                                          */
 262         u_int8_t ipf_mff;               /* XXX overlays ip_tos: use low bit
 263                                          * to avoid destroying tos (PPPDTRuu);
 264                                          * copied from (ip_off&IP_MF) */
 265         int16_t ip_len;
 266         u_int16_t       ip_id;
 267         int16_t ip_off;
 268         u_int8_t        ip_ttl;
 269         u_int8_t        ip_p;
 270         u_int16_t       ip_sum;
 271         ipasfragp_32 ipf_next;          /* next fragment */
 272         ipasfragp_32 ipf_prev;          /* previous fragment */
 273 };
 274
 275 /*
 276  * Structure stored in mbuf in inpcb.ip_options
 277  * and passed to ip_output when ip options are in use.
 278  * The actual length of the options (including ipopt_dst)
 279  * is in m_len.
 280  */
 281 #define MAX_IPOPTLEN    40
 282
 283 struct ipoption {
 284         struct  in_addr ipopt_dst;      /* first-hop dst if source routed */
 285         int8_t  ipopt_list[MAX_IPOPTLEN];       /* options proper */
 286 };
 287
 288 /*
 289  * Structure attached to inpcb.ip_moptions and
 290  * passed to ip_output when IP multicast options are in use.
 291  */
 292
 293 struct  ipstat {
 294         u_long  ips_total;              /* total packets received */
 295         u_long  ips_badsum;             /* checksum bad */
 296         u_long  ips_tooshort;           /* packet too short */
 297         u_long  ips_toosmall;           /* not enough data */
 298         u_long  ips_badhlen;            /* ip header length < data size */
 299         u_long  ips_badlen;             /* ip length < ip header length */
 300         u_long  ips_fragments;          /* fragments received */
 301         u_long  ips_fragdropped;        /* frags dropped (dups, out of space) */
 302         u_long  ips_fragtimeout;        /* fragments timed out */
 303         u_long  ips_forward;            /* packets forwarded */
 304         u_long  ips_cantforward;        /* packets rcvd for unreachable dest */
 305         u_long  ips_redirectsent;       /* packets forwarded on same net */
 306         u_long  ips_noproto;            /* unknown or unsupported protocol */
 307         u_long  ips_delivered;          /* datagrams delivered to upper level*/
 308         u_long  ips_localout;           /* total ip packets generated here */
 309         u_long  ips_odropped;           /* lost packets due to nobufs, etc. */
 310         u_long  ips_reassembled;        /* total packets reassembled ok */
 311         u_long  ips_fragmented;         /* datagrams successfully fragmented */
 312         u_long  ips_ofragments;         /* output fragments created */
 313         u_long  ips_cantfrag;           /* don't fragment flag was set, etc. */
 314         u_long  ips_badoptions;         /* error in option processing */
 315         u_long  ips_noroute;            /* packets discarded due to no route */
 316         u_long  ips_badvers;            /* ip version != 4 */
 317         u_long  ips_rawout;             /* total raw ip packets generated */
 318         u_long  ips_unaligned;          /* times the ip packet was not aligned */
 319 };
 320
 321 extern struct   ipstat  ipstat;
 322 extern struct   ipq     ipq;                    /* ip reass. queue */
 323 extern u_int16_t        ip_id;                          /* ip packet ctr, for ids */
 324 extern int      ip_defttl;                      /* default IP ttl */
 325
 326 #endif