slirp/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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)ip.h        8.1 (Berkeley) 6/10/93
  30  * ip.h,v 1.3 1994/08/21 05:27:30 paul Exp
  31  */
  32
  33 #ifndef _IP_H_
  34 #define _IP_H_
  35
  36 #ifdef HOST_WORDS_BIGENDIAN
  37 # undef NTOHL
  38 # undef NTOHS
  39 # undef HTONL
  40 # undef HTONS
  41 # define NTOHL(d)
  42 # define NTOHS(d)
  43 # define HTONL(d)
  44 # define HTONS(d)
  45 #else
  46 # ifndef NTOHL
  47 #  define NTOHL(d) ((d) = ntohl((d)))
  48 # endif
  49 # ifndef NTOHS
  50 #  define NTOHS(d) ((d) = ntohs((uint16_t)(d)))
  51 # endif
  52 # ifndef HTONL
  53 #  define HTONL(d) ((d) = htonl((d)))
  54 # endif
  55 # ifndef HTONS
  56 #  define HTONS(d) ((d) = htons((uint16_t)(d)))
  57 # endif
  58 #endif
  59
  60 typedef uint32_t n_long;                 /* long as received from the net */
  61
  62 /*
  63  * Definitions for internet protocol version 4.
  64  * Per RFC 791, September 1981.
  65  */
  66 #define IPVERSION       4
  67
  68 /*
  69  * Structure of an internet header, naked of options.
  70  */
  71 struct ip {
  72 #ifdef HOST_WORDS_BIGENDIAN
  73         uint8_t ip_v:4,                 /* version */
  74                 ip_hl:4;                /* header length */
  75 #else
  76         uint8_t ip_hl:4,                /* header length */
  77                 ip_v:4;                 /* version */
  78 #endif
  79         uint8_t         ip_tos;                 /* type of service */
  80         uint16_t        ip_len;                 /* total length */
  81         uint16_t        ip_id;                  /* identification */
  82         uint16_t        ip_off;                 /* fragment offset field */
  83 #define IP_DF 0x4000                    /* don't fragment flag */
  84 #define IP_MF 0x2000                    /* more fragments flag */
  85 #define IP_OFFMASK 0x1fff               /* mask for fragmenting bits */
  86         uint8_t ip_ttl;                 /* time to live */
  87         uint8_t ip_p;                   /* protocol */
  88         uint16_t        ip_sum;                 /* checksum */
  89         struct  in_addr ip_src,ip_dst;  /* source and dest address */
  90 } QEMU_PACKED;
  91
  92 #define IP_MAXPACKET    65535           /* maximum packet size */
  93
  94 /*
  95  * Definitions for IP type of service (ip_tos)
  96  */
  97 #define IPTOS_LOWDELAY          0x10
  98 #define IPTOS_THROUGHPUT        0x08
  99 #define IPTOS_RELIABILITY       0x04
 100
 101 /*
 102  * Definitions for options.
 103  */
 104 #define IPOPT_COPIED(o)         ((o)&0x80)
 105 #define IPOPT_CLASS(o)          ((o)&0x60)
 106 #define IPOPT_NUMBER(o)         ((o)&0x1f)
 107
 108 #define IPOPT_CONTROL           0x00
 109 #define IPOPT_RESERVED1         0x20
 110 #define IPOPT_DEBMEAS           0x40
 111 #define IPOPT_RESERVED2         0x60
 112
 113 #define IPOPT_EOL               0               /* end of option list */
 114 #define IPOPT_NOP               1               /* no operation */
 115
 116 #define IPOPT_RR                7               /* record packet route */
 117 #define IPOPT_TS                68              /* timestamp */
 118 #define IPOPT_SECURITY          130             /* provide s,c,h,tcc */
 119 #define IPOPT_LSRR              131             /* loose source route */
 120 #define IPOPT_SATID             136             /* satnet id */
 121 #define IPOPT_SSRR              137             /* strict source route */
 122
 123 /*
 124  * Offsets to fields in options other than EOL and NOP.
 125  */
 126 #define IPOPT_OPTVAL            0               /* option ID */
 127 #define IPOPT_OLEN              1               /* option length */
 128 #define IPOPT_OFFSET            2               /* offset within option */
 129 #define IPOPT_MINOFF            4               /* min value of above */
 130
 131 /*
 132  * Time stamp option structure.
 133  */
 134 struct  ip_timestamp {
 135         uint8_t ipt_code;               /* IPOPT_TS */
 136         uint8_t ipt_len;                /* size of structure (variable) */
 137         uint8_t ipt_ptr;                /* index of current entry */
 138 #ifdef HOST_WORDS_BIGENDIAN
 139         uint8_t ipt_oflw:4,             /* overflow counter */
 140                 ipt_flg:4;              /* flags, see below */
 141 #else
 142         uint8_t ipt_flg:4,              /* flags, see below */
 143                 ipt_oflw:4;             /* overflow counter */
 144 #endif
 145         union ipt_timestamp {
 146                 n_long  ipt_time[1];
 147                 struct  ipt_ta {
 148                         struct in_addr ipt_addr;
 149                         n_long ipt_time;
 150                 } ipt_ta[1];
 151         } ipt_timestamp;
 152 } QEMU_PACKED;
 153
 154 /* flag bits for ipt_flg */
 155 #define IPOPT_TS_TSONLY         0               /* timestamps only */
 156 #define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
 157 #define IPOPT_TS_PRESPEC        3               /* specified modules only */
 158
 159 /* bits for security (not byte swapped) */
 160 #define IPOPT_SECUR_UNCLASS     0x0000
 161 #define IPOPT_SECUR_CONFID      0xf135
 162 #define IPOPT_SECUR_EFTO        0x789a
 163 #define IPOPT_SECUR_MMMM        0xbc4d
 164 #define IPOPT_SECUR_RESTR       0xaf13
 165 #define IPOPT_SECUR_SECRET      0xd788
 166 #define IPOPT_SECUR_TOPSECRET   0x6bc5
 167
 168 /*
 169  * Internet implementation parameters.
 170  */
 171 #define MAXTTL          255             /* maximum time to live (seconds) */
 172 #define IPDEFTTL        64              /* default ttl, from RFC 1340 */
 173 #define IPFRAGTTL       60              /* time to live for frags, slowhz */
 174 #define IPTTLDEC        1               /* subtracted when forwarding */
 175
 176 #define IP_MSS          576             /* default maximum segment size */
 177
 178 #if SIZEOF_CHAR_P == 4
 179 struct mbuf_ptr {
 180         struct mbuf *mptr;
 181         uint32_t dummy;
 182 } QEMU_PACKED;
 183 #else
 184 struct mbuf_ptr {
 185         struct mbuf *mptr;
 186 } QEMU_PACKED;
 187 #endif
 188 struct qlink {
 189         void *next, *prev;
 190 };
 191
 192 /*
 193  * Overlay for ip header used by other protocols (tcp, udp).
 194  */
 195 struct ipovly {
 196         struct mbuf_ptr ih_mbuf;        /* backpointer to mbuf */
 197         uint8_t ih_x1;                  /* (unused) */
 198         uint8_t ih_pr;                  /* protocol */
 199         uint16_t        ih_len;                 /* protocol length */
 200         struct  in_addr ih_src;         /* source internet address */
 201         struct  in_addr ih_dst;         /* destination internet address */
 202 } QEMU_PACKED;
 203
 204 /*
 205  * Ip reassembly queue structure.  Each fragment
 206  * being reassembled is attached to one of these structures.
 207  * They are timed out after ipq_ttl drops to 0, and may also
 208  * be reclaimed if memory becomes tight.
 209  * size 28 bytes
 210  */
 211 struct ipq {
 212         struct qlink frag_link;                 /* to ip headers of fragments */
 213         struct qlink ip_link;                           /* to other reass headers */
 214         uint8_t ipq_ttl;                /* time for reass q to live */
 215         uint8_t ipq_p;                  /* protocol of this fragment */
 216         uint16_t        ipq_id;                 /* sequence id for reassembly */
 217         struct  in_addr ipq_src,ipq_dst;
 218 } QEMU_PACKED;
 219
 220 /*
 221  * Ip header, when holding a fragment.
 222  *
 223  * Note: ipf_link must be at same offset as frag_link above
 224  */
 225 struct  ipasfrag {
 226         struct qlink ipf_link;
 227         struct ip ipf_ip;
 228 } QEMU_PACKED;
 229
 230 #define ipf_off      ipf_ip.ip_off
 231 #define ipf_tos      ipf_ip.ip_tos
 232 #define ipf_len      ipf_ip.ip_len
 233 #define ipf_next     ipf_link.next
 234 #define ipf_prev     ipf_link.prev
 235
 236 /*
 237  * Structure stored in mbuf in inpcb.ip_options
 238  * and passed to ip_output when ip options are in use.
 239  * The actual length of the options (including ipopt_dst)
 240  * is in m_len.
 241  */
 242 #define MAX_IPOPTLEN    40
 243
 244 struct ipoption {
 245         struct  in_addr ipopt_dst;      /* first-hop dst if source routed */
 246         int8_t  ipopt_list[MAX_IPOPTLEN];       /* options proper */
 247 } QEMU_PACKED;
 248
 249 #endif