ext/dnet/ip.h

   1 /*
   2  * ip.h
   3  *
   4  * Internet Protocol (RFC 791).
   5  *
   6  * Copyright (c) 2000 Dug Song <dugsong@monkey.org>
   7  *
   8  * $Id: ip.h,v 1.23 2003/03/16 17:39:17 dugsong Exp $
   9  */
  10
  11 #ifndef DNET_IP_H
  12 #define DNET_IP_H
  13
  14 #define IP_ADDR_LEN     4               /* IP address length */
  15 #define IP_ADDR_BITS    32              /* IP address bits */
  16
  17 #define IP_HDR_LEN      20              /* base IP header length */
  18 #define IP_OPT_LEN      2               /* base IP option length */
  19 #define IP_OPT_LEN_MAX  40
  20 #define IP_HDR_LEN_MAX  (IP_HDR_LEN + IP_OPT_LEN_MAX)
  21
  22 #define IP_LEN_MAX      65535
  23 #define IP_LEN_MIN      IP_HDR_LEN
  24
  25 typedef uint32_t        ip_addr_t;
  26
  27 #ifndef __GNUC__
  28 # define __attribute__(x)
  29 # pragma pack(1)
  30 #endif
  31
  32 /*
  33  * IP header, without options
  34  */
  35 struct ip_hdr {
  36 #if DNET_BYTESEX == DNET_BIG_ENDIAN
  37         uint8_t         ip_v:4,         /* version */
  38                         ip_hl:4;        /* header length (incl any options) */
  39 #elif DNET_BYTESEX == DNET_LIL_ENDIAN
  40         uint8_t         ip_hl:4,
  41                         ip_v:4;
  42 #else
  43 # error "need to include <dnet.h>"
  44 #endif
  45         uint8_t         ip_tos;         /* type of service */
  46         uint16_t        ip_len;         /* total length (incl header) */
  47         uint16_t        ip_id;          /* identification */
  48         uint16_t        ip_off;         /* fragment offset and flags */
  49         uint8_t         ip_ttl;         /* time to live */
  50         uint8_t         ip_p;           /* protocol */
  51         uint16_t        ip_sum;         /* checksum */
  52         ip_addr_t       ip_src;         /* source address */
  53         ip_addr_t       ip_dst;         /* destination address */
  54 };
  55
  56 /*
  57  * Type of service (ip_tos), RFC 1349 ("obsoleted by RFC 2474")
  58  */
  59 #define IP_TOS_DEFAULT          0x00    /* default */
  60 #define IP_TOS_LOWDELAY         0x10    /* low delay */
  61 #define IP_TOS_THROUGHPUT       0x08    /* high throughput */
  62 #define IP_TOS_RELIABILITY      0x04    /* high reliability */
  63 #define IP_TOS_LOWCOST          0x02    /* low monetary cost - XXX */
  64 #define IP_TOS_ECT              0x02    /* ECN-capable transport */
  65 #define IP_TOS_CE               0x01    /* congestion experienced */
  66
  67 /*
  68  * IP precedence (high 3 bits of ip_tos), hopefully unused
  69  */
  70 #define IP_TOS_PREC_ROUTINE             0x00
  71 #define IP_TOS_PREC_PRIORITY            0x20
  72 #define IP_TOS_PREC_IMMEDIATE           0x40
  73 #define IP_TOS_PREC_FLASH               0x60
  74 #define IP_TOS_PREC_FLASHOVERRIDE       0x80
  75 #define IP_TOS_PREC_CRITIC_ECP          0xa0
  76 #define IP_TOS_PREC_INTERNETCONTROL     0xc0
  77 #define IP_TOS_PREC_NETCONTROL          0xe0
  78
  79 /*
  80  * Fragmentation flags (ip_off)
  81  */
  82 #define IP_RF           0x8000          /* reserved */
  83 #define IP_DF           0x4000          /* don't fragment */
  84 #define IP_MF           0x2000          /* more fragments (not last frag) */
  85 #define IP_OFFMASK      0x1fff          /* mask for fragment offset */
  86
  87 /*
  88  * Time-to-live (ip_ttl), seconds
  89  */
  90 #define IP_TTL_DEFAULT  64              /* default ttl, RFC 1122, RFC 1340 */
  91 #define IP_TTL_MAX      255             /* maximum ttl */
  92
  93 /*
  94  * Protocol (ip_p) - http://www.iana.org/assignments/protocol-numbers
  95  */
  96 #define IP_PROTO_IP             0               /* dummy for IP */
  97 #define IP_PROTO_HOPOPTS        IP_PROTO_IP     /* IPv6 hop-by-hop options */
  98 #define IP_PROTO_ICMP           1               /* ICMP */
  99 #define IP_PROTO_IGMP           2               /* IGMP */
 100 #define IP_PROTO_GGP            3               /* gateway-gateway protocol */
 101 #define IP_PROTO_IPIP           4               /* IP in IP */
 102 #define IP_PROTO_ST             5               /* ST datagram mode */
 103 #define IP_PROTO_TCP            6               /* TCP */
 104 #define IP_PROTO_CBT            7               /* CBT */
 105 #define IP_PROTO_EGP            8               /* exterior gateway protocol */
 106 #define IP_PROTO_IGP            9               /* interior gateway protocol */
 107 #define IP_PROTO_BBNRCC         10              /* BBN RCC monitoring */
 108 #define IP_PROTO_NVP            11              /* Network Voice Protocol */
 109 #define IP_PROTO_PUP            12              /* PARC universal packet */
 110 #define IP_PROTO_ARGUS          13              /* ARGUS */
 111 #define IP_PROTO_EMCON          14              /* EMCON */
 112 #define IP_PROTO_XNET           15              /* Cross Net Debugger */
 113 #define IP_PROTO_CHAOS          16              /* Chaos */
 114 #define IP_PROTO_UDP            17              /* UDP */
 115 #define IP_PROTO_MUX            18              /* multiplexing */
 116 #define IP_PROTO_DCNMEAS        19              /* DCN measurement */
 117 #define IP_PROTO_HMP            20              /* Host Monitoring Protocol */
 118 #define IP_PROTO_PRM            21              /* Packet Radio Measurement */
 119 #define IP_PROTO_IDP            22              /* Xerox NS IDP */
 120 #define IP_PROTO_TRUNK1         23              /* Trunk-1 */
 121 #define IP_PROTO_TRUNK2         24              /* Trunk-2 */
 122 #define IP_PROTO_LEAF1          25              /* Leaf-1 */
 123 #define IP_PROTO_LEAF2          26              /* Leaf-2 */
 124 #define IP_PROTO_RDP            27              /* "Reliable Datagram" proto */
 125 #define IP_PROTO_IRTP           28              /* Inet Reliable Transaction */
 126 #define IP_PROTO_TP             29              /* ISO TP class 4 */
 127 #define IP_PROTO_NETBLT         30              /* Bulk Data Transfer */
 128 #define IP_PROTO_MFPNSP         31              /* MFE Network Services */
 129 #define IP_PROTO_MERITINP       32              /* Merit Internodal Protocol */
 130 #define IP_PROTO_SEP            33              /* Sequential Exchange proto */
 131 #define IP_PROTO_3PC            34              /* Third Party Connect proto */
 132 #define IP_PROTO_IDPR           35              /* Interdomain Policy Route */
 133 #define IP_PROTO_XTP            36              /* Xpress Transfer Protocol */
 134 #define IP_PROTO_DDP            37              /* Datagram Delivery Proto */
 135 #define IP_PROTO_CMTP           38              /* IDPR Ctrl Message Trans */
 136 #define IP_PROTO_TPPP           39              /* TP++ Transport Protocol */
 137 #define IP_PROTO_IL             40              /* IL Transport Protocol */
 138 #define IP_PROTO_IPV6           41              /* IPv6 */
 139 #define IP_PROTO_SDRP           42              /* Source Demand Routing */
 140 #define IP_PROTO_ROUTING        43              /* IPv6 routing header */
 141 #define IP_PROTO_FRAGMENT       44              /* IPv6 fragmentation header */
 142 #define IP_PROTO_RSVP           46              /* Reservation protocol */
 143 #define IP_PROTO_GRE            47              /* General Routing Encap */
 144 #define IP_PROTO_MHRP           48              /* Mobile Host Routing */
 145 #define IP_PROTO_ENA            49              /* ENA */
 146 #define IP_PROTO_ESP            50              /* Encap Security Payload */
 147 #define IP_PROTO_AH             51              /* Authentication Header */
 148 #define IP_PROTO_INLSP          52              /* Integated Net Layer Sec */
 149 #define IP_PROTO_SWIPE          53              /* SWIPE */
 150 #define IP_PROTO_NARP           54              /* NBMA Address Resolution */
 151 #define IP_PROTO_MOBILE         55              /* Mobile IP, RFC 2004 */
 152 #define IP_PROTO_TLSP           56              /* Transport Layer Security */
 153 #define IP_PROTO_SKIP           57              /* SKIP */
 154 #define IP_PROTO_ICMPV6         58              /* ICMP for IPv6 */
 155 #define IP_PROTO_NONE           59              /* IPv6 no next header */
 156 #define IP_PROTO_DSTOPTS        60              /* IPv6 destination options */
 157 #define IP_PROTO_ANYHOST        61              /* any host internal proto */
 158 #define IP_PROTO_CFTP           62              /* CFTP */
 159 #define IP_PROTO_ANYNET         63              /* any local network */
 160 #define IP_PROTO_EXPAK          64              /* SATNET and Backroom EXPAK */
 161 #define IP_PROTO_KRYPTOLAN      65              /* Kryptolan */
 162 #define IP_PROTO_RVD            66              /* MIT Remote Virtual Disk */
 163 #define IP_PROTO_IPPC           67              /* Inet Pluribus Packet Core */
 164 #define IP_PROTO_DISTFS         68              /* any distributed fs */
 165 #define IP_PROTO_SATMON         69              /* SATNET Monitoring */
 166 #define IP_PROTO_VISA           70              /* VISA Protocol */
 167 #define IP_PROTO_IPCV           71              /* Inet Packet Core Utility */
 168 #define IP_PROTO_CPNX           72              /* Comp Proto Net Executive */
 169 #define IP_PROTO_CPHB           73              /* Comp Protocol Heart Beat */
 170 #define IP_PROTO_WSN            74              /* Wang Span Network */
 171 #define IP_PROTO_PVP            75              /* Packet Video Protocol */
 172 #define IP_PROTO_BRSATMON       76              /* Backroom SATNET Monitor */
 173 #define IP_PROTO_SUNND          77              /* SUN ND Protocol */
 174 #define IP_PROTO_WBMON          78              /* WIDEBAND Monitoring */
 175 #define IP_PROTO_WBEXPAK        79              /* WIDEBAND EXPAK */
 176 #define IP_PROTO_EON            80              /* ISO CNLP */
 177 #define IP_PROTO_VMTP           81              /* Versatile Msg Transport*/
 178 #define IP_PROTO_SVMTP          82              /* Secure VMTP */
 179 #define IP_PROTO_VINES          83              /* VINES */
 180 #define IP_PROTO_TTP            84              /* TTP */
 181 #define IP_PROTO_NSFIGP         85              /* NSFNET-IGP */
 182 #define IP_PROTO_DGP            86              /* Dissimilar Gateway Proto */
 183 #define IP_PROTO_TCF            87              /* TCF */
 184 #define IP_PROTO_EIGRP          88              /* EIGRP */
 185 #define IP_PROTO_OSPF           89              /* Open Shortest Path First */
 186 #define IP_PROTO_SPRITERPC      90              /* Sprite RPC Protocol */
 187 #define IP_PROTO_LARP           91              /* Locus Address Resolution */
 188 #define IP_PROTO_MTP            92              /* Multicast Transport Proto */
 189 #define IP_PROTO_AX25           93              /* AX.25 Frames */
 190 #define IP_PROTO_IPIPENCAP      94              /* yet-another IP encap */
 191 #define IP_PROTO_MICP           95              /* Mobile Internet Ctrl */
 192 #define IP_PROTO_SCCSP          96              /* Semaphore Comm Sec Proto */
 193 #define IP_PROTO_ETHERIP        97              /* Ethernet in IPv4 */
 194 #define IP_PROTO_ENCAP          98              /* encapsulation header */
 195 #define IP_PROTO_ANYENC         99              /* private encryption scheme */
 196 #define IP_PROTO_GMTP           100             /* GMTP */
 197 #define IP_PROTO_IFMP           101             /* Ipsilon Flow Mgmt Proto */
 198 #define IP_PROTO_PNNI           102             /* PNNI over IP */
 199 #define IP_PROTO_PIM            103             /* Protocol Indep Multicast */
 200 #define IP_PROTO_ARIS           104             /* ARIS */
 201 #define IP_PROTO_SCPS           105             /* SCPS */
 202 #define IP_PROTO_QNX            106             /* QNX */
 203 #define IP_PROTO_AN             107             /* Active Networks */
 204 #define IP_PROTO_IPCOMP         108             /* IP Payload Compression */
 205 #define IP_PROTO_SNP            109             /* Sitara Networks Protocol */
 206 #define IP_PROTO_COMPAQPEER     110             /* Compaq Peer Protocol */
 207 #define IP_PROTO_IPXIP          111             /* IPX in IP */
 208 #define IP_PROTO_VRRP           112             /* Virtual Router Redundancy */
 209 #define IP_PROTO_PGM            113             /* PGM Reliable Transport */
 210 #define IP_PROTO_ANY0HOP        114             /* 0-hop protocol */
 211 #define IP_PROTO_L2TP           115             /* Layer 2 Tunneling Proto */
 212 #define IP_PROTO_DDX            116             /* D-II Data Exchange (DDX) */
 213 #define IP_PROTO_IATP           117             /* Interactive Agent Xfer */
 214 #define IP_PROTO_STP            118             /* Schedule Transfer Proto */
 215 #define IP_PROTO_SRP            119             /* SpectraLink Radio Proto */
 216 #define IP_PROTO_UTI            120             /* UTI */
 217 #define IP_PROTO_SMP            121             /* Simple Message Protocol */
 218 #define IP_PROTO_SM             122             /* SM */
 219 #define IP_PROTO_PTP            123             /* Performance Transparency */
 220 #define IP_PROTO_ISIS           124             /* ISIS over IPv4 */
 221 #define IP_PROTO_FIRE           125             /* FIRE */
 222 #define IP_PROTO_CRTP           126             /* Combat Radio Transport */
 223 #define IP_PROTO_CRUDP          127             /* Combat Radio UDP */
 224 #define IP_PROTO_SSCOPMCE       128             /* SSCOPMCE */
 225 #define IP_PROTO_IPLT           129             /* IPLT */
 226 #define IP_PROTO_SPS            130             /* Secure Packet Shield */
 227 #define IP_PROTO_PIPE           131             /* Private IP Encap in IP */
 228 #define IP_PROTO_SCTP           132             /* Stream Ctrl Transmission */
 229 #define IP_PROTO_FC             133             /* Fibre Channel */
 230 #define IP_PROTO_RSVPIGN        134             /* RSVP-E2E-IGNORE */
 231 #define IP_PROTO_RAW            255             /* Raw IP packets */
 232 #define IP_PROTO_RESERVED       IP_PROTO_RAW    /* Reserved */
 233 #define IP_PROTO_MAX            255
 234
 235 /*
 236  * Option types (opt_type) - http://www.iana.org/assignments/ip-parameters
 237  */
 238 #define IP_OPT_CONTROL          0x00            /* control */
 239 #define IP_OPT_DEBMEAS          0x40            /* debugging & measurement */
 240 #define IP_OPT_COPY             0x80            /* copy into all fragments */
 241 #define IP_OPT_RESERVED1        0x20
 242 #define IP_OPT_RESERVED2        0x60
 243
 244 #define IP_OPT_EOL        0                     /* end of option list */
 245 #define IP_OPT_NOP        1                     /* no operation */
 246 #define IP_OPT_SEC       (2|IP_OPT_COPY)        /* DoD basic security */
 247 #define IP_OPT_LSRR      (3|IP_OPT_COPY)        /* loose source route */
 248 #define IP_OPT_TS        (4|IP_OPT_DEBMEAS)     /* timestamp */
 249 #define IP_OPT_ESEC      (5|IP_OPT_COPY)        /* DoD extended security */
 250 #define IP_OPT_CIPSO     (6|IP_OPT_COPY)        /* commercial security */
 251 #define IP_OPT_RR         7                     /* record route */
 252 #define IP_OPT_SATID     (8|IP_OPT_COPY)        /* stream ID (obsolete) */
 253 #define IP_OPT_SSRR      (9|IP_OPT_COPY)        /* strict source route */
 254 #define IP_OPT_ZSU       10                     /* experimental measurement */
 255 #define IP_OPT_MTUP      11                     /* MTU probe */
 256 #define IP_OPT_MTUR      12                     /* MTU reply */
 257 #define IP_OPT_FINN     (13|IP_OPT_COPY|IP_OPT_DEBMEAS) /* exp flow control */
 258 #define IP_OPT_VISA     (14|IP_OPT_COPY)        /* exp access control */
 259 #define IP_OPT_ENCODE    15                     /* ??? */
 260 #define IP_OPT_IMITD    (16|IP_OPT_COPY)        /* IMI traffic descriptor */
 261 #define IP_OPT_EIP      (17|IP_OPT_COPY)        /* extended IP, RFC 1385 */
 262 #define IP_OPT_TR       (18|IP_OPT_DEBMEAS)     /* traceroute */
 263 #define IP_OPT_ADDEXT   (19|IP_OPT_COPY)        /* IPv7 ext addr, RFC 1475 */
 264 #define IP_OPT_RTRALT   (20|IP_OPT_COPY)        /* router alert, RFC 2113 */
 265 #define IP_OPT_SDB      (21|IP_OPT_COPY)        /* directed bcast, RFC 1770 */
 266 #define IP_OPT_NSAPA    (22|IP_OPT_COPY)        /* NSAP addresses */
 267 #define IP_OPT_DPS      (23|IP_OPT_COPY)        /* dynamic packet state */
 268 #define IP_OPT_UMP      (24|IP_OPT_COPY)        /* upstream multicast */
 269 #define IP_OPT_MAX       25
 270
 271 #define IP_OPT_COPIED(o)        ((o) & 0x80)
 272 #define IP_OPT_CLASS(o)         ((o) & 0x60)
 273 #define IP_OPT_NUMBER(o)        ((o) & 0x1f)
 274 #define IP_OPT_TYPEONLY(o)      ((o) == IP_OPT_EOL || (o) == IP_OPT_NOP)
 275
 276 /*
 277  * Security option data - RFC 791, 3.1
 278  */
 279 struct ip_opt_data_sec {
 280         uint16_t        s;              /* security */
 281         uint16_t        c;              /* compartments */
 282         uint16_t        h;              /* handling restrictions */
 283         uint8_t         tcc[3];         /* transmission control code */
 284 } __attribute__((__packed__));
 285
 286 #define IP_OPT_SEC_UNCLASS      0x0000  /* unclassified */
 287 #define IP_OPT_SEC_CONFID       0xf135  /* confidential */
 288 #define IP_OPT_SEC_EFTO         0x789a  /* EFTO */
 289 #define IP_OPT_SEC_MMMM         0xbc4d  /* MMMM */
 290 #define IP_OPT_SEC_PROG         0x5e26  /* PROG */
 291 #define IP_OPT_SEC_RESTR        0xaf13  /* restricted */
 292 #define IP_OPT_SEC_SECRET       0xd788  /* secret */
 293 #define IP_OPT_SEC_TOPSECRET    0x6bc5  /* top secret */
 294
 295 /*
 296  * {Loose Source, Record, Strict Source} Route option data - RFC 791, 3.1
 297  */
 298 struct ip_opt_data_rr {
 299         uint8_t         ptr;            /* from start of option, >= 4 */
 300         uint32_t        iplist __flexarr; /* list of IP addresses */
 301 } __attribute__((__packed__));
 302
 303 /*
 304  * Timestamp option data - RFC 791, 3.1
 305  */
 306 struct ip_opt_data_ts {
 307         uint8_t         ptr;            /* from start of option, >= 5 */
 308 #if DNET_BYTESEX == DNET_BIG_ENDIAN
 309         uint8_t         oflw:4,         /* number of IPs skipped */
 310                         flg:4;          /* address[ / timestamp] flag */
 311 #elif DNET_BYTESEX == DNET_LIL_ENDIAN
 312         uint8_t         flg:4,
 313                         oflw:4;
 314 #endif
 315         uint32_t        ipts __flexarr; /* IP address [/ timestamp] pairs */
 316 } __attribute__((__packed__));
 317
 318 #define IP_OPT_TS_TSONLY        0       /* timestamps only */
 319 #define IP_OPT_TS_TSADDR        1       /* IP address / timestamp pairs */
 320 #define IP_OPT_TS_PRESPEC       3       /* IP address / zero timestamp pairs */
 321
 322 /*
 323  * Traceroute option data - RFC 1393, 2.2
 324  */
 325 struct ip_opt_data_tr {
 326         uint16_t        id;             /* ID number */
 327         uint16_t        ohc;            /* outbound hop count */
 328         uint16_t        rhc;            /* return hop count */
 329         uint32_t        origip;         /* originator IP address */
 330 } __attribute__((__packed__));
 331
 332 /*
 333  * IP option (following IP header)
 334  */
 335 struct ip_opt {
 336         uint8_t         opt_type;       /* option type */
 337         uint8_t         opt_len;        /* option length >= IP_OPT_LEN */
 338         union ip_opt_data {
 339                 struct ip_opt_data_sec  sec;       /* IP_OPT_SEC */
 340                 struct ip_opt_data_rr   rr;        /* IP_OPT_{L,S}RR */
 341                 struct ip_opt_data_ts   ts;        /* IP_OPT_TS */
 342                 uint16_t                satid;     /* IP_OPT_SATID */
 343                 uint16_t                mtu;       /* IP_OPT_MTU{P,R} */
 344                 struct ip_opt_data_tr   tr;        /* IP_OPT_TR */
 345                 uint32_t                addext[2]; /* IP_OPT_ADDEXT */
 346                 uint16_t                rtralt;    /* IP_OPT_RTRALT */
 347                 uint32_t                sdb[9];    /* IP_OPT_SDB */
 348                 uint8_t                 data8[IP_OPT_LEN_MAX - IP_OPT_LEN];
 349         } opt_data;
 350 } __attribute__((__packed__));
 351
 352 #ifndef __GNUC__
 353 # pragma pack()
 354 #endif
 355
 356 /*
 357  * Classful addressing
 358  */
 359 #define IP_CLASSA(i)            (((uint32_t)(i) & htonl(0x80000000)) == \
 360                                  htonl(0x00000000))
 361 #define IP_CLASSA_NET           (htonl(0xff000000))
 362 #define IP_CLASSA_NSHIFT        24
 363 #define IP_CLASSA_HOST          (htonl(0x00ffffff))
 364 #define IP_CLASSA_MAX           128
 365
 366 #define IP_CLASSB(i)            (((uint32_t)(i) & htonl(0xc0000000)) == \
 367                                  htonl(0x80000000))
 368 #define IP_CLASSB_NET           (htonl(0xffff0000))
 369 #define IP_CLASSB_NSHIFT        16
 370 #define IP_CLASSB_HOST          (htonl(0x0000ffff))
 371 #define IP_CLASSB_MAX           65536
 372
 373 #define IP_CLASSC(i)            (((uint32_t)(i) & htonl(0xe0000000)) == \
 374                                  htonl(0xc0000000))
 375 #define IP_CLASSC_NET           (htonl(0xffffff00))
 376 #define IP_CLASSC_NSHIFT        8
 377 #define IP_CLASSC_HOST          (htonl(0x000000ff))
 378
 379 #define IP_CLASSD(i)            (((uint32_t)(i) & htonl(0xf0000000)) == \
 380                                  htonl(0xe0000000))
 381 /* These ones aren't really net and host fields, but routing needn't know. */
 382 #define IP_CLASSD_NET           (htonl(0xf0000000))
 383 #define IP_CLASSD_NSHIFT        28
 384 #define IP_CLASSD_HOST          (htonl(0x0fffffff))
 385 #define IP_MULTICAST(i)         IP_CLASSD(i)
 386
 387 #define IP_EXPERIMENTAL(i)      (((uint32_t)(i) & htonl(0xf0000000)) == \
 388                                  htonl(0xf0000000))
 389 #define IP_BADCLASS(i)          (((uint32_t)(i) & htonl(0xf0000000)) == \
 390                                  htonl(0xf0000000))
 391 #define IP_LOCAL_GROUP(i)       (((uint32_t)(i) & htonl(0xffffff00)) == \
 392                                  htonl(0xe0000000))
 393 /*
 394  * Reserved addresses
 395  */
 396 #define IP_ADDR_ANY             (htonl(0x00000000))     /* 0.0.0.0 */
 397 #define IP_ADDR_BROADCAST       (htonl(0xffffffff))     /* 255.255.255.255 */
 398 #define IP_ADDR_LOOPBACK        (htonl(0x7f000001))     /* 127.0.0.1 */
 399 #define IP_ADDR_MCAST_ALL       (htonl(0xe0000001))     /* 224.0.0.1 */
 400 #define IP_ADDR_MCAST_LOCAL     (htonl(0xe00000ff))     /* 224.0.0.225 */
 401
 402 #define ip_pack_hdr(hdr, tos, len, id, off, ttl, p, src, dst) do {      \
 403         struct ip_hdr *ip_pack_p = (struct ip_hdr *)(hdr);              \
 404         ip_pack_p->ip_v = 4; ip_pack_p->ip_hl = 5;                      \
 405         ip_pack_p->ip_tos = tos; ip_pack_p->ip_len = htons(len);        \
 406         ip_pack_p->ip_id = htons(id); ip_pack_p->ip_off = htons(off);   \
 407         ip_pack_p->ip_ttl = ttl; ip_pack_p->ip_p = p;                   \
 408         ip_pack_p->ip_src = src; ip_pack_p->ip_dst = dst;               \
 409 } while (0)
 410
 411 typedef struct ip_handle ip_t;
 412
 413 __BEGIN_DECLS
 414 ip_t    *ip_open(void);
 415 size_t   ip_send(ip_t *i, const void *buf, size_t len);
 416 ip_t    *ip_close(ip_t *i);
 417
 418 char    *ip_ntop(const ip_addr_t *ip, char *dst, size_t len);
 419 int      ip_pton(const char *src, ip_addr_t *dst);
 420 char    *ip_ntoa(const ip_addr_t *ip);
 421 #define  ip_aton ip_pton
 422
 423 size_t   ip_add_option(void *buf, size_t len,
 424             int proto, const void *optbuf, size_t optlen);
 425 void     ip_checksum(void *buf, size_t len);
 426
 427 inline int
 428 ip_cksum_add(const void *buf, size_t len, int cksum)
 429 {
 430         uint16_t *sp = (uint16_t *)buf;
 431         int sn;
 432
 433         sn = len / 2;
 434
 435         do {
 436             cksum += *sp++;
 437         } while (--sn > 0);
 438         if (len & 1)
 439                 cksum += htons(*(u_char *)sp << 8);
 440
 441         return (cksum);
 442 }
 443
 444 inline uint16_t
 445 ip_cksum_carry(int x)
 446 {
 447         x = (x >> 16) + (x & 0xffff);
 448         return ~(x + (x >> 16)) & 0xffff;
 449 }
 450
 451 __END_DECLS
 452
 453 #endif /* DNET_IP_H */