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/*!\file netinet/in.h

 * IP address, options and definitions.

 */

/*

 * Copyright (c) 1982, 1986, 1990, 1993

 *      The 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        8.3 (Berkeley) 1/3/94

 * $Id: in.h,v 1.22.2.1 1996/11/11 23:40:37 phk Exp $

 */

#ifndef __NETINET_IN_H

#define __NETINET_IN_H

#ifndef __SYS_SOCKET_H

#include <sys/socket.h>

#endif

/*

 * Constants and structures defined by the internet system,

 * Per RFC 790, September 1981, and numerous additions.

 */

/*

 * 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_IPIP            4               /* IP encapsulation in IP */

#define IPPROTO_TCP             6               /* tcp */

#define IPPROTO_EGP             8               /* exterior gateway protocol */

#define IPPROTO_IGRP            9               /* interior gw routing 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_XTP             36              /* eXpress Transfer Protocol */

#define IPPROTO_RSVP            46              /* resource reservation */

#define IPPROTO_ESP             50

#define IPPROTO_AH              51              /* authenticate header */

#define IPPROTO_ICMPV6          58              /* ICMP v6 */

#define IPPROTO_NONE            59

#define IPPROTO_EON             80              /* ISO cnlp */

#define IPPROTO_ENCAP           98              /* encapsulation header */

#define IPPROTO_PIM             103

#define IPPROTO_VRRP            112

#define IPPROTO_SCTP            132

#define IPPROTO_DIVERT          254             /* divert pseudo-protocol */

#define IPPROTO_RAW             255             /* raw IP packet */

#define IPPROTO_MAX             256

/*

 * Local port number conventions:

 *

 * When a user does a bind(2) or connect(2) with a port number of zero,

 * a non-conflicting local port address is chosen.

 * The default range is IPPORT_RESERVED through

 * IPPORT_USERRESERVED, although that is settable by sysctl.

 *

 * A user may set the IPPROTO_IP option IP_PORTRANGE to change this

 * default assignment range.

 *

 * The value IP_PORTRANGE_DEFAULT causes the default behavior.

 *

 * The value IP_PORTRANGE_HIGH changes the range of candidate port numbers

 * into the "high" range.  These are reserved for client outbound connections

 * which do not want to be filtered by any firewalls.

 *

 * The value IP_PORTRANGE_LOW changes the range to the "low" are

 * that is (by convention) restricted to privileged processes.  This

 * convention is based on "vouchsafe" principles only.  It is only secure

 * if you trust the remote host to restrict these ports.

 *

 * The default range of ports and the high range can be changed by

 * sysctl(3).  (net.inet.ip.port{hi,low}{first,last}_auto)

 *

 * Changing those values has bad security implications if you are

 * using a a stateless firewall that is allowing packets outside of that

 * range in order to allow transparent outgoing connections.

 *

 * Such a firewall configuration will generally depend on the use of these

 * default values.  If you change them, you may find your Security

 * Administrator looking for you with a heavy object.

 */

/*

 * Ports < IPPORT_RESERVED are reserved for

 * privileged processes (e.g. root).         (IP_PORTRANGE_LOW)

 * Ports > IPPORT_USERRESERVED are reserved

 * for servers, not necessarily privileged.  (IP_PORTRANGE_DEFAULT)

 */

#define IPPORT_RESERVED         1024

#define IPPORT_USERRESERVED     5000

/*

 * Default local port range to use by setting IP_PORTRANGE_HIGH

 */

#define IPPORT_HIFIRSTAUTO      40000

#define IPPORT_HILASTAUTO       44999

/*

 * Scanning for a free reserved port return a value below IPPORT_RESERVED,

 * but higher than IPPORT_RESERVEDSTART.  Traditionally the start value was

 * 512, but that conflicts with some well-known-services that firewalls may

 * have a fit if we use.

 */

#define IPPORT_RESERVEDSTART    600

/*

 * Internet address (a structure for historical reasons)

 */

struct in_addr {

       u_long s_addr;

     };

/*

 *  For IPv6 from RFC2133

 */

struct in6_addr {

       u_int8_t  s6_addr[16];

     };

/*

 * 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 */

#define INADDR_LOOPBACK         (u_long)0x7F000001      /* 127.0.0.1 */

#define INADDR_NONE             0xFFFFFFFF              /* -1 return */

#define INADDR_UNSPEC_GROUP     (u_long)0xE0000000      /* 224.0.0.0 */

#define INADDR_ALLHOSTS_GROUP   (u_long)0xE0000001      /* 224.0.0.1 */

#define INADDR_ALLRTRS_GROUP    (u_long)0xE0000002      /* 224.0.0.2 */

#define INADDR_MAX_LOCAL_GROUP  (u_long)0xE00000FF      /* 224.0.0.255 */

#define IN_LOOPBACKNET          127                     /* official! */

W32_DATA const struct in6_addr in6addr_any;             /* :: */

W32_DATA const struct in6_addr in6addr_loopback;        /* ::1 */

#define IN6ADDR_ANY_INIT      { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } } }

#define IN6ADDR_LOOPBACK_INIT { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 } } }

#define INET_ADDRSTRLEN       16

#define INET6_ADDRSTRLEN      46

/*

 * Socket address, internet style.

 */

struct sockaddr_in {

       u_short        sin_family;

       u_short        sin_port;

       struct in_addr sin_addr;

       char           sin_zero[8];

     };

struct sockaddr_in6 {

       u_int16_t       sin6_family;

       u_int16_t       sin6_port;

       u_int32_t       sin6_flowinfo;

       struct in6_addr sin6_addr;

       u_int32_t       sin6_scope_id; /* IPv6 scope-id */

     };

/*

 * Stolen from winsock2.h (hope this is portable)

 * Portable IPv6/IPv4 version of sockaddr.

 * Uses padding to force 8 byte alignment

 * and maximum size of 128 bytes

 */

struct sockaddr_storage {

       u_short  ss_family;

       u_short  ss_len;        /* !! added for BSD progs, gv Nov-2003 */

       char   __ss_pad1[6];              /* pad to 8 */

       long   __ss_align1, __ssalign2;   /* force alignment */

       char   __ss_pad2[110];            /* pad to 128 */

     };

/* IPv6 multicast request. */

struct ipv6_mreq {

       /* IPv6 multicast address of group */

       struct in6_addr ipv6mr_multiaddr;

       /* local interface */

       unsigned long ipv6mr_interface;

     };

/*

 * 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 options */

#define IP_HDRINCL              2    /* int; header is included with data */

#define IP_TOS                  3    /* int; IP type of service and preced. */

#define IP_TTL                  4    /* int; IP time to live */

#define IP_RECVOPTS             5    /* bool; receive all IP opts w/dgram */

#define IP_RECVRETOPTS          6    /* bool; receive IP opts for response */

#define IP_RECVDSTADDR          7    /* bool; receive IP dst addr w/dgram */

#define IP_RETOPTS              8    /* ip_opts; set/get IP options */

#define IP_MULTICAST_IF         9    /* u_char; set/get IP multicast i/f  */

#define IP_MULTICAST_TTL        10   /* u_char; set/get IP multicast ttl */

#define IP_MULTICAST_LOOP       11   /* u_char; set/get IP multicast loopback */

#define IP_ADD_MEMBERSHIP       12   /* ip_mreq; add an IP group membership */

#define IP_DROP_MEMBERSHIP      13   /* ip_mreq; drop an IP group membership */

#define IP_MULTICAST_VIF        14   /* set/get IP mcast virt. iface */

#define IP_RSVP_ON              15   /* enable RSVP in kernel */

#define IP_RSVP_OFF             16   /* disable RSVP in kernel */

#define IP_RSVP_VIF_ON          17   /* set RSVP per-vif socket */

#define IP_RSVP_VIF_OFF         18   /* unset RSVP per-vif socket */

#define IP_PORTRANGE            19   /* int; range to choose for unspec port */

#define IP_RECVIF               20   /* bool; receive reception if w/dgram */

#define IP_FW_ADD               50   /* add a firewall rule to chain */

#define IP_FW_DEL               51   /* delete a firewall rule from chain */

#define IP_FW_FLUSH             52   /* flush firewall rule chain */

#define IP_FW_ZERO              53   /* clear single/all firewall counter(s) */

#define IP_FW_GET               54   /* get entire firewall rule chain */

#define IP_NAT                  55   /* set/get NAT opts */

/*

 * Defaults and limits for 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 */

};

/*

 * Argument for IP_PORTRANGE:

 * - which range to search when port is unspecified at bind() or connect()

 */

#define IP_PORTRANGE_DEFAULT    0       /* default range */

#define IP_PORTRANGE_HIGH       1       /* "high" - request firewall bypass */

#define IP_PORTRANGE_LOW        2       /* "low" - vouchsafe security */

/*

 * Definitions for inet sysctl operations.

 *

 * Third level is protocol number.

 * Fourth level is desired variable within that protocol.

 */

#define IPPROTO_MAXID   (IPPROTO_IDP + 1)       /* don't list to IPPROTO_MAX */

#define CTL_IPPROTO_NAMES { \

        { "ip", CTLTYPE_NODE }, \

        { "icmp", CTLTYPE_NODE }, \

        { "igmp", CTLTYPE_NODE }, \

        { "ggp", CTLTYPE_NODE }, \

        { 0, 0 }, \

        { 0, 0 }, \

        { "tcp", CTLTYPE_NODE }, \

        { 0, 0 }, \

        { "egp", CTLTYPE_NODE }, \

        { 0, 0 }, \

        { 0, 0 }, \

        { 0, 0 }, \

        { "pup", CTLTYPE_NODE }, \

        { 0, 0 }, \

        { 0, 0 }, \

        { 0, 0 }, \

        { 0, 0 }, \

        { "udp", CTLTYPE_NODE }, \

        { 0, 0 }, \

        { 0, 0 }, \

        { 0, 0 }, \

        { 0, 0 }, \

        { "idp", CTLTYPE_NODE }, \

}

/*

 * Names for IP sysctl objects

 */

#define IPCTL_FORWARDING        1       /* act as router */

#define IPCTL_SENDREDIRECTS     2       /* may send redirects when forwarding */

#define IPCTL_DEFTTL            3       /* default TTL */

#define IPCTL_DEFMTU            4       /* default MTU */

#define IPCTL_RTEXPIRE          5       /* cloned route expiration time */

#define IPCTL_RTMINEXPIRE       6       /* min value for expiration time */

#define IPCTL_RTMAXCACHE        7       /* trigger level for dynamic expire */

#define IPCTL_SOURCEROUTE       8       /* may perform source routes */

#define IPCTL_DIRECTEDBROADCAST 9       /* may re-broadcast received packets */

#define IPCTL_INTRQMAXLEN       10      /* max length of netisr queue */

#define IPCTL_INTRQDROPS        11      /* number of netisr q drops */

#define IPCTL_MAXID             12

#define IPCTL_NAMES { \

        { 0, 0 }, \

        { "forwarding", CTLTYPE_INT }, \

        { "redirect", CTLTYPE_INT }, \

        { "ttl", CTLTYPE_INT }, \

        { "mtu", CTLTYPE_INT }, \

        { "rtexpire", CTLTYPE_INT }, \

        { "rtminexpire", CTLTYPE_INT }, \

        { "rtmaxcache", CTLTYPE_INT }, \

        { "sourceroute", CTLTYPE_INT }, \

        { "directed-broadcast", CTLTYPE_INT }, \

        { "intr-queue-maxlen", CTLTYPE_INT }, \

        { "intr-queue-drops", CTLTYPE_INT }, \

}

/*

 * IPv6 address macros

 */

#define IN6_IS_ADDR_UNSPECIFIED(a)        \

           (((u_int32_t*)(a))[0] == 0   \

         && ((u_int32_t*)(a))[1] == 0   \

         && ((u_int32_t*)(a))[2] == 0   \

         && ((u_int32_t*)(a))[3] == 0)

#define IN6_IS_ADDR_LOOPBACK(a)           \

           (((u_int32_t*)(a))[0] == 0   \

         && ((u_int32_t*)(a))[1] == 0   \

         && ((u_int32_t*)(a))[2] == 0   \

         && ((u_int32_t*)(a))[3] == htonl (1))

#define IN6_IS_ADDR_MULTICAST(a) (((u_int8_t*) (a))[0] == 0xff)

#define IN6_IS_ADDR_LINKLOCAL(a) \

        ((((u_int32_t*)(a))[0] & htonl(0xffc00000)) == htonl(0xfe800000))

#define IN6_IS_ADDR_SITELOCAL(a) \

        ((((u_int32_t*)(a))[0] & htonl(0xffc00000)) == htonl(0xfec00000))

#define IN6_IS_ADDR_V4MAPPED(a)         \

           ((((u_int32_t*)(a))[0] == 0) \

         && (((u_int32_t*)(a))[1] == 0) \

         && (((u_int32_t*)(a))[2] == htonl(0xffff)))

#define IN6_IS_ADDR_V4COMPAT(a)         \

           ((((u_int32_t*)(a))[0] == 0) \

         && (((u_int32_t*)(a))[1] == 0) \

         && (((u_int32_t*)(a))[2] == 0) \

         && (ntohl(((u_int32_t*)(a))[3]) > 1))

#define IN6_ARE_ADDR_EQUAL(a,b) \

           ((((u_int32_t*)(a))[0] == ((u_int32_t*)(b))[0])  \

         && (((u_int32_t*)(a))[1] == ((u_int32_t*)(b))[1])  \

         && (((u_int32_t*)(a))[2] == ((u_int32_t*)(b))[2])  \

         && (((u_int32_t*)(a))[3] == ((u_int32_t*)(b))[3]))

#define IN6_IS_ADDR_MC_NODELOCAL(a) \

        (IN6_IS_ADDR_MULTICAST(a) && ((((u_int8_t*)(a))[1] & 0xf) == 0x1))

#define IN6_IS_ADDR_MC_LINKLOCAL(a) \

        (IN6_IS_ADDR_MULTICAST(a) && ((((u_int8_t*)(a))[1] & 0xf) == 0x2))

#define IN6_IS_ADDR_MC_SITELOCAL(a) \

        (IN6_IS_ADDR_MULTICAST(a) && ((((u_int8_t*)(a))[1] & 0xf) == 0x5))

#define IN6_IS_ADDR_MC_ORGLOCAL(a)  \

        (IN6_IS_ADDR_MULTICAST(a) && ((((u_int8_t*)(a))[1] & 0xf) == 0x8))

#define IN6_IS_ADDR_MC_GLOBAL(a)    \

        (IN6_IS_ADDR_MULTICAST(a) && ((((u_int8_t*)(a))[1] & 0xf) == 0xe))

#endif /* __NETINET_IN_H */