text: /*
   * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   *
   * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   * 
   * This file contains Original Code and/or Modifications of Original Code
   * as defined in and that are subject to the Apple Public Source License
   * Version 2.0 (the 'License'). You may not use this file except in
   * compliance with the License. The rights granted to you under the License
   * may not be used to create, or enable the creation or redistribution of,
   * unlawful or unlicensed copies of an Apple operating system, or to
   * circumvent, violate, or enable the circumvention or violation of, any
   * terms of an Apple operating system software license agreement.
   * 
   * Please obtain a copy of the License at
   * http://www.opensource.apple.com/apsl/ and read it before using this file.
   * 
   * The Original Code and all software distributed under the License are
   * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
   * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
   * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
   * Please see the License for the specific language governing rights and
   * limitations under the License.
   * 
   * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
   */
  /*
   * 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
   * $FreeBSD: src/sys/netinet/in.h,v 1.48.2.2 2001/04/21 14:53:06 ume Exp $
   */
  
  #ifndef _NETINET_IN_H_
  #define _NETINET_IN_H_
  #include <sys/appleapiopts.h>
  #include <sys/_types.h>
  #include <stdint.h>		/* uint(8|16|32)_t */
  
  #ifndef _IN_ADDR_T
  #define _IN_ADDR_T
  typedef	__uint32_t	in_addr_t;	/* base type for internet address */
  #endif
  
  #ifndef _IN_PORT_T
  #define _IN_PORT_T
  typedef	__uint16_t	in_port_t;
  #endif
  
  /*
   * POSIX 1003.1-2003
   * "Inclusion of the <netinet/in.h> header may also make visible all
   *  symbols from <inttypes.h> and <sys/socket.h>".
   */
  #include <sys/socket.h>
  
  /*
   * The following two #includes insure htonl and family are defined
   */
  #include <machine/endian.h>
  #include <sys/_endian.h>
  
  /*
   * Constants and structures defined by the internet system,
   * Per RFC 790, September 1981, and numerous additions.
   */
  
  /*
   * Protocols (RFC 1700)
   */
  #define	IPPROTO_IP		0		/* dummy for IP */
  #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
  #define	IPPROTO_HOPOPTS	0		/* IP6 hop-by-hop options */
  #endif	/* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
  #define	IPPROTO_ICMP		1		/* control message protocol */
  #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
  #define	IPPROTO_IGMP		2		/* group mgmt protocol */
  #define	IPPROTO_GGP		3		/* gateway^2 (deprecated) */
  #define IPPROTO_IPV4		4 		/* IPv4 encapsulation */
  #define IPPROTO_IPIP		IPPROTO_IPV4	/* for compatibility */
  #endif	/* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
  #define	IPPROTO_TCP		6		/* tcp */
  #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
  #define	IPPROTO_ST		7		/* Stream protocol II */
  #define	IPPROTO_EGP		8		/* exterior gateway protocol */
  #define	IPPROTO_PIGP		9		/* private interior gateway */
  #define	IPPROTO_RCCMON		10		/* BBN RCC Monitoring */
  #define	IPPROTO_NVPII		11		/* network voice protocol*/
  #define	IPPROTO_PUP		12		/* pup */
  #define	IPPROTO_ARGUS		13		/* Argus */
  #define	IPPROTO_EMCON		14		/* EMCON */
  #define	IPPROTO_XNET		15		/* Cross Net Debugger */
  #define	IPPROTO_CHAOS		16		/* Chaos*/
  #endif	/* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
  #define	IPPROTO_UDP		17		/* user datagram protocol */
  #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
  #define	IPPROTO_MUX		18		/* Multiplexing */
  #define	IPPROTO_MEAS		19		/* DCN Measurement Subsystems */
  #define	IPPROTO_HMP		20		/* Host Monitoring */
  #define	IPPROTO_PRM		21		/* Packet Radio Measurement */
  #define	IPPROTO_IDP		22		/* xns idp */
  #define	IPPROTO_TRUNK1		23		/* Trunk-1 */
  #define	IPPROTO_TRUNK2		24		/* Trunk-2 */
  #define	IPPROTO_LEAF1		25		/* Leaf-1 */
  #define	IPPROTO_LEAF2		26		/* Leaf-2 */
  #define	IPPROTO_RDP		27		/* Reliable Data */
  #define	IPPROTO_IRTP		28		/* Reliable Transaction */
  #define	IPPROTO_TP		29 		/* tp-4 w/ class negotiation */
  #define	IPPROTO_BLT		30		/* Bulk Data Transfer */
  #define	IPPROTO_NSP		31		/* Network Services */
  #define	IPPROTO_INP		32		/* Merit Internodal */
  #define	IPPROTO_SEP		33		/* Sequential Exchange */
  #define	IPPROTO_3PC		34		/* Third Party Connect */
  #define	IPPROTO_IDPR		35		/* InterDomain Policy Routing */
  #define	IPPROTO_XTP		36		/* XTP */
  #define	IPPROTO_DDP		37		/* Datagram Delivery */
  #define	IPPROTO_CMTP		38		/* Control Message Transport */
  #define	IPPROTO_TPXX		39		/* TP++ Transport */
  #define	IPPROTO_IL		40		/* IL transport protocol */
  #endif	/* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
  #define 	IPPROTO_IPV6		41		/* IP6 header */
  #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
  #define	IPPROTO_SDRP		42		/* Source Demand Routing */
  #define 	IPPROTO_ROUTING	43		/* IP6 routing header */
  #define 	IPPROTO_FRAGMENT	44		/* IP6 fragmentation header */
  #define	IPPROTO_IDRP		45		/* InterDomain Routing*/
  #define 	IPPROTO_RSVP		46 		/* resource reservation */
  #define	IPPROTO_GRE		47		/* General Routing Encap. */
  #define	IPPROTO_MHRP		48		/* Mobile Host Routing */
  #define	IPPROTO_BHA		49		/* BHA */
  #define	IPPROTO_ESP		50		/* IP6 Encap Sec. Payload */
  #define	IPPROTO_AH		51		/* IP6 Auth Header */
  #define	IPPROTO_INLSP		52		/* Integ. Net Layer Security */
  #define	IPPROTO_SWIPE		53		/* IP with encryption */
  #define	IPPROTO_NHRP		54		/* Next Hop Resolution */
  /* 55-57: Unassigned */
  #define 	IPPROTO_ICMPV6	58		/* ICMP6 */
  #define 	IPPROTO_NONE		59		/* IP6 no next header */
  #define 	IPPROTO_DSTOPTS	60		/* IP6 destination option */
  #define	IPPROTO_AHIP		61		/* any host internal protocol */
  #define	IPPROTO_CFTP		62		/* CFTP */
  #define	IPPROTO_HELLO		63		/* "hello" routing protocol */
  #define	IPPROTO_SATEXPAK	64		/* SATNET/Backroom EXPAK */
  #define	IPPROTO_KRYPTOLAN	65		/* Kryptolan */
  #define	IPPROTO_RVD		66		/* Remote Virtual Disk */
  #define	IPPROTO_IPPC		67		/* Pluribus Packet Core */
  #define	IPPROTO_ADFS		68		/* Any distributed FS */
  #define	IPPROTO_SATMON		69		/* Satnet Monitoring */
  #define	IPPROTO_VISA		70		/* VISA Protocol */
  #define	IPPROTO_IPCV		71		/* Packet Core Utility */
  #define	IPPROTO_CPNX		72		/* Comp. Prot. Net. Executive */
  #define	IPPROTO_CPHB		73		/* Comp. Prot. HeartBeat */
  #define	IPPROTO_WSN		74		/* Wang Span Network */
  #define	IPPROTO_PVP		75		/* Packet Video Protocol */
  #define	IPPROTO_BRSATMON	76		/* BackRoom SATNET Monitoring */
  #define	IPPROTO_ND		77		/* Sun net disk proto (temp.) */
  #define	IPPROTO_WBMON		78		/* WIDEBAND Monitoring */
  #define	IPPROTO_WBEXPAK		79		/* WIDEBAND EXPAK */
  #define	IPPROTO_EON		80		/* ISO cnlp */
  #define	IPPROTO_VMTP		81		/* VMTP */
  #define	IPPROTO_SVMTP		82		/* Secure VMTP */
  #define	IPPROTO_VINES		83		/* Banyon VINES */
  #define	IPPROTO_TTP		84		/* TTP */
  #define	IPPROTO_IGP		85		/* NSFNET-IGP */
  #define	IPPROTO_DGP		86		/* dissimilar gateway prot. */
  #define	IPPROTO_TCF		87		/* TCF */
  #define	IPPROTO_IGRP		88		/* Cisco/GXS IGRP */
  #define	IPPROTO_OSPFIGP		89		/* OSPFIGP */
  #define	IPPROTO_SRPC		90		/* Strite RPC protocol */
  #define	IPPROTO_LARP		91		/* Locus Address Resoloution */
  #define	IPPROTO_MTP		92		/* Multicast Transport */
  #define	IPPROTO_AX25		93		/* AX.25 Frames */
  #define	IPPROTO_IPEIP		94		/* IP encapsulated in IP */
  #define	IPPROTO_MICP		95		/* Mobile Int.ing control */
  #define	IPPROTO_SCCSP		96		/* Semaphore Comm. security */
  #define	IPPROTO_ETHERIP		97		/* Ethernet IP encapsulation */
  #define	IPPROTO_ENCAP		98		/* encapsulation header */
  #define	IPPROTO_APES		99		/* any private encr. scheme */
  #define	IPPROTO_GMTP		100		/* GMTP*/
  #define	IPPROTO_IPCOMP	108		/* payload compression (IPComp) */
  /* 101-254: Partly Unassigned */
  #define	IPPROTO_PIM		103		/* Protocol Independent Mcast */
  #define	IPPROTO_PGM		113		/* PGM */
  /* 255: Reserved */
  /* BSD Private, local use, namespace incursion */
  #define	IPPROTO_DIVERT		254		/* divert pseudo-protocol */
  #endif	/* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
  #define	IPPROTO_RAW		255		/* raw IP packet */
  
  #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
  #define	IPPROTO_MAX		256
  
  /* last return value of *_input(), meaning "all job for this pkt is done".  */
  #define	IPPROTO_DONE		257
  #endif /* (_POSIX_C_SOURCE && !_DARWIN_C_SOURCE) */
  
  /*
   * 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.
   *
   * For a slightly more orthodox text view on this:
   *
   *            ftp://ftp.isi.edu/in-notes/iana/assignments/port-numbers
   *
   *    port numbers are divided into three ranges:
   *
   *                0 -  1023 Well Known Ports
   *             1024 - 49151 Registered Ports
   *            49152 - 65535 Dynamic and/or Private Ports
   *
   */
  
  #define	__DARWIN_IPPORT_RESERVED	1024
  
  #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
  /*
   * 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)
   */
  #ifndef IPPORT_RESERVED
  #define	IPPORT_RESERVED		__DARWIN_IPPORT_RESERVED
  #endif
  #define	IPPORT_USERRESERVED	5000
  
  /*
   * Default local port range to use by setting IP_PORTRANGE_HIGH
   */
  #define	IPPORT_HIFIRSTAUTO	49152
  #define	IPPORT_HILASTAUTO	65535
  
  /*
   * 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
  #endif	/* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
  
  /*
   * Internet address (a structure for historical reasons)
   */
  struct in_addr {
  	in_addr_t 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	INADDR_ANY		(u_int32_t)0x00000000
  #define	INADDR_BROADCAST	(u_int32_t)0xffffffff	/* must be masked */
  
  #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
  #define	IN_CLASSA(i)		(((u_int32_t)(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)		(((u_int32_t)(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)		(((u_int32_t)(i) & 0xe0000000) == 0xc0000000)
  #define	IN_CLASSC_NET		0xffffff00
  #define	IN_CLASSC_NSHIFT	8
  #define	IN_CLASSC_HOST		0x000000ff
  
  #define	IN_CLASSD(i)		(((u_int32_t)(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)	(((u_int32_t)(i) & 0xf0000000) == 0xf0000000)
  #define	IN_BADCLASS(i)		(((u_int32_t)(i) & 0xf0000000) == 0xf0000000)
  
  #define	INADDR_LOOPBACK		(u_int32_t)0x7f000001
  
  #define	INADDR_UNSPEC_GROUP	(u_int32_t)0xe0000000	/* 224.0.0.0 */
  #define	INADDR_ALLHOSTS_GROUP	(u_int32_t)0xe0000001	/* 224.0.0.1 */
  #define	INADDR_ALLRTRS_GROUP	(u_int32_t)0xe0000002	/* 224.0.0.2 */
  #define	INADDR_MAX_LOCAL_GROUP	(u_int32_t)0xe00000ff	/* 224.0.0.255 */
  
  #ifdef __APPLE__
  #define IN_LINKLOCALNETNUM	(u_int32_t)0xA9FE0000 /* 169.254.0.0 */
  #define IN_LINKLOCAL(i)		(((u_int32_t)(i) & IN_CLASSB_NET) == IN_LINKLOCALNETNUM)
  #endif
  
  #define	IN_LOOPBACKNET		127			/* official! */
  #endif	/* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
  
  /*
   * Socket address, internet style.
   */
  struct sockaddr_in {
  	__uint8_t	sin_len;
  	sa_family_t	sin_family;
  	in_port_t	sin_port;
  	struct	in_addr sin_addr;
  	char		sin_zero[8];		/* XXX bwg2001-004 */
  };
  
  #define INET_ADDRSTRLEN                 16
  
  #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
  /*
   * 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 */
  /* for IPSEC */
  #define	IP_IPSEC_POLICY		21   /* int; set/get security policy */
  #define	IP_FAITH		22   /* bool; accept FAITH'ed connections */
  #ifdef __APPLE__
  #define IP_STRIPHDR      	23   /* bool: drop receive of raw IP header */
  #endif
  #define IP_RECVTTL			24	/* bool; receive reception TTL w/dgram */
  
  
  #define	IP_FW_ADD     		40   /* add a firewall rule to chain */
  #define	IP_FW_DEL    		41   /* delete a firewall rule from chain */
  #define	IP_FW_FLUSH   		42   /* flush firewall rule chain */
  #define	IP_FW_ZERO    		43   /* clear single/all firewall counter(s) */
  #define	IP_FW_GET     		44   /* get entire firewall rule chain */
  #define	IP_FW_RESETLOG		45   /* reset logging counters */
  
  /* These older firewall socket option codes are maintained for backward compatibility. */
  #define	IP_OLD_FW_ADD     	50   /* add a firewall rule to chain */
  #define	IP_OLD_FW_DEL    	51   /* delete a firewall rule from chain */
  #define	IP_OLD_FW_FLUSH   	52   /* flush firewall rule chain */
  #define	IP_OLD_FW_ZERO    	53   /* clear single/all firewall counter(s) */
  #define	IP_OLD_FW_GET     	54   /* get entire firewall rule chain */
  #define IP_NAT__XXX			55   /* set/get NAT opts XXX Deprecated, do not use */
  #define	IP_OLD_FW_RESETLOG	56   /* reset logging counters */
  
  #define	IP_DUMMYNET_CONFIGURE	60   /* add/configure a dummynet pipe */
  #define	IP_DUMMYNET_DEL		61   /* delete a dummynet pipe from chain */
  #define	IP_DUMMYNET_FLUSH	62   /* flush dummynet */
  #define	IP_DUMMYNET_GET		64   /* get entire dummynet pipes */
  
  #define	IP_TRAFFIC_MGT_BACKGROUND	65   /* int*; get background IO flags; set background IO */
  
  #if CONFIG_FORCE_OUT_IFP
  /* This is a hack, this is only a hack. */
  #define	IP_FORCE_OUT_IFP	69	/* char ifname[] - send traffic on this interface */
  #endif
  
  /* Background socket configuration flags */
  #ifdef __APPLE_API_UNSTABLE
  #define TRAFFIC_MGT_SO_BACKGROUND	0x0001
  #define TRAFFIC_MGT_SO_BG_SUPPRESSED	0x0002
  #endif /* __APPLE_API_UNSTABLE */
  
  /*
   * 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_AH + 1)	/* don't list to IPPROTO_MAX */
  
  
  /*
   * 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 */
  #ifdef notyet
  #define	IPCTL_DEFMTU		4	/* default MTU */
  #endif
  #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_STATS		12	/* ipstat structure */
  #define	IPCTL_ACCEPTSOURCEROUTE	13	/* may accept source routed packets */
  #define	IPCTL_FASTFORWARDING	14	/* use fast IP forwarding code */
  #define	IPCTL_KEEPFAITH		15	/* FAITH IPv4->IPv6 translater ctl */
  #define	IPCTL_GIF_TTL		16	/* default TTL for gif encap packet */
  #define	IPCTL_MAXID		17
  
  
  #endif	/* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
  
  
  /* INET6 stuff */
  #define __KAME_NETINET_IN_H_INCLUDED_
  #include <netinet6/in6.h>
  #undef __KAME_NETINET_IN_H_INCLUDED_
  
  #define MAX_IPv4_STR_LEN	16
  #define MAX_IPv6_STR_LEN	64
  
  extern const char *inet_ntop(int, const void *, char *, socklen_t); /* in libkern */
  
  #endif /* _NETINET_IN_H_ */
  