usr/src/sys/netinet/in.h

/*
 * Copyright (c) 1982, 1986, 1990 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)in.h        7.11 (Berkeley) 4/20/91
 */

/*
 * Constants and structures defined by the internet system,
 * Per RFC 790, September 1981.
 */

/*
 * Protocols
 */
#define IPPROTO_IP              0               /* dummy for IP */
#define IPPROTO_ICMP            1               /* control message protocol */
#define IPPROTO_GGP             3               /* gateway^2 (deprecated) */
#define IPPROTO_TCP             6               /* tcp */
#define IPPROTO_EGP             8               /* exterior gateway protocol */
#define IPPROTO_PUP             12              /* pup */
#define IPPROTO_UDP             17              /* user datagram protocol */
#define IPPROTO_IDP             22              /* xns idp */
#define IPPROTO_TP              29              /* tp-4 w/ class negotiation */
#define IPPROTO_EON             80              /* ISO cnlp */

#define IPPROTO_RAW             255             /* raw IP packet */
#define IPPROTO_MAX             256


/*
 * Local port number conventions:
 * Ports < IPPORT_RESERVED are reserved for
 * privileged processes (e.g. root).
 * Ports > IPPORT_USERRESERVED are reserved
 * for servers, not necessarily privileged.
 */
#define IPPORT_RESERVED         1024
#define IPPORT_USERRESERVED     5000

/*
 * Internet address (a structure for historical reasons)
 */
struct in_addr {
        u_long s_addr;
};

/*
 * Definitions of bits in internet address integers.
 * On subnets, the decomposition of addresses to host and net parts
 * is done according to subnet mask, not the masks here.
 */
#define IN_CLASSA(i)            (((long)(i) & 0x80000000) == 0)
#define IN_CLASSA_NET           0xff000000
#define IN_CLASSA_NSHIFT        24
#define IN_CLASSA_HOST          0x00ffffff
#define IN_CLASSA_MAX           128

#define IN_CLASSB(i)            (((long)(i) & 0xc0000000) == 0x80000000)
#define IN_CLASSB_NET           0xffff0000
#define IN_CLASSB_NSHIFT        16
#define IN_CLASSB_HOST          0x0000ffff
#define IN_CLASSB_MAX           65536

#define IN_CLASSC(i)            (((long)(i) & 0xe0000000) == 0xc0000000)
#define IN_CLASSC_NET           0xffffff00
#define IN_CLASSC_NSHIFT        8
#define IN_CLASSC_HOST          0x000000ff

#define IN_CLASSD(i)            (((long)(i) & 0xf0000000) == 0xe0000000)
#define IN_MULTICAST(i)         IN_CLASSD(i)

#define IN_EXPERIMENTAL(i)      (((long)(i) & 0xe0000000) == 0xe0000000)
#define IN_BADCLASS(i)          (((long)(i) & 0xf0000000) == 0xf0000000)

#define INADDR_ANY              (u_long)0x00000000
#define INADDR_BROADCAST        (u_long)0xffffffff      /* must be masked */
#ifndef KERNEL
#define INADDR_NONE             0xffffffff              /* -1 return */
#endif

#define IN_LOOPBACKNET          127                     /* official! */

/*
 * Socket address, internet style.
 */
struct sockaddr_in {
        u_char  sin_len;
        u_char  sin_family;
        u_short sin_port;
        struct  in_addr sin_addr;
        char    sin_zero[8];
};

/*
 * Structure used to describe IP options.
 * Used to store options internally, to pass them to a process,
 * or to restore options retrieved earlier.
 * The ip_dst is used for the first-hop gateway when using a source route
 * (this gets put into the header proper).
 */
struct ip_opts {
        struct  in_addr ip_dst;         /* first hop, 0 w/o src rt */
        char    ip_opts[40];            /* actually variable in size */
};

/*
 * Options for use with [gs]etsockopt at the IP level.
 * First word of comment is data type; bool is stored in int.
 */
#define IP_OPTIONS      1       /* buf/ip_opts; set/get IP per-packet options */
#define IP_HDRINCL      2       /* int; header is included with data (raw) */
#define IP_TOS          3       /* int; IP type of service and precedence */
#define IP_TTL          4       /* int; IP time to live */
#define IP_RECVOPTS     5       /* bool; receive all IP options w/datagram */
#define IP_RECVRETOPTS  6       /* bool; receive IP options for response */
#define IP_RECVDSTADDR  7       /* bool; receive IP dst addr w/datagram */
#define IP_RETOPTS      8       /* ip_opts; set/get IP per-packet options */

#ifdef KERNEL
struct  in_addr in_makeaddr();
u_long  in_netof(), in_lnaof();
#endif