usr/src/sys/netinet/in.h

/*
 * Copyright (c) 1982, 1986, 1990 Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)in.h        7.13 (Berkeley) %G%
 */

/*
 * 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_IGMP            2               /* group mgmt 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_ENCAP           98              /* encapsulation header */

#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_CLASSD_NET           0xf0000000      /* These ones aren't really */
#define IN_CLASSD_NSHIFT        28              /* net and host fields, but */
#define IN_CLASSD_HOST          0x0fffffff      /* routing needn't know.    */
#define IN_MULTICAST(i)         IN_CLASSD(i)

#define IN_EXPERIMENTAL(i)      (((long)(i) & 0xf0000000) == 0xf0000000)
#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 INADDR_UNSPEC_GROUP     (u_long)0xe0000000      /* 224.0.0.0   */
#define INADDR_ALLHOSTS_GROUP   (u_long)0xe0000001      /* 224.0.0.1   */
#define INADDR_MAX_LOCAL_GROUP  (u_long)0xe00000ff      /* 224.0.0.255 */

#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_MULTICAST_IF         2 /* in_addr; set/get IP multicast interface */
#define IP_MULTICAST_TTL        3 /* u_char; set/get IP multicast timetolive */
#define IP_MULTICAST_LOOP       4 /* u_char; set/get IP multicast loopback */
#define IP_ADD_MEMBERSHIP       5 /* ip_mreq; add an IP group membership */
#define IP_DROP_MEMBERSHIP      6 /* ip_mreq; drop an IP group membership */


#define IP_HDRINCL      7       /* int; header is included with data (raw) */
#define IP_TOS          8       /* int; IP type of service and precedence */
#define IP_TTL          9       /* int; IP time to live */
#define IP_RECVOPTS     10      /* bool; receive all IP options w/datagram */
#define IP_RECVRETOPTS  11      /* bool; receive IP options for response */
#define IP_RECVDSTADDR  12      /* bool; receive IP dst addr w/datagram */
#define IP_RETOPTS      13      /* ip_opts; set/get IP per-packet options */

#define IP_DEFAULT_MULTICAST_TTL 1      /* normally limit m'casts to 1 hop */
#define IP_DEFAULT_MULTICAST_LOOP 1     /* normally hear sends if a member */
#define IP_MAX_MEMBERSHIPS      20      /* per socket */

/*
 * Argument structure for IP_ADD_MEMBERSHIP and IP_DROP_MEMBERSHIP.
 */
struct ip_mreq {
        struct in_addr  imr_multiaddr;  /* IP multicast address of group */
        struct in_addr  imr_interface;  /* local IP address of interface */
};

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