in.h

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struct sockaddr_in {
	u_int8_t    sin_len;
	sa_family_t sin_family;
	in_port_t   sin_port;
	struct	    in_addr sin_addr;
	int8_t	    sin_zero[8];
};

#if 0	/*NRL IPv6*/
/*
 * IP Version 6 socket address.
 */
#define SIN6_LEN 1
struct sockaddr_in6 {
	u_int8_t	sin6_len;
	sa_family_t	sin6_family;
	in_port_t	sin6_port;
	u_int32_t	sin6_flowinfo;
	struct in6_addr	sin6_addr;
	u_int32_t	sin6_scope_id;
};
#endif

#define INET_ADDRSTRLEN                 16

/*
 * 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 */
#if defined(__cplusplus)
	int8_t		Ip_opts[40];	/* cannot have same name as class */
#else
	int8_t		ip_opts[40];	/* actually variable in size */
#endif
};

/*
 * 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    /* in_addr; 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 */

/* 14-17 left empty for future compatibility with FreeBSD */

#define IP_PORTRANGE		19   /* int; range to choose for unspec port */
#define IP_AUTH_LEVEL		20   /* u_char; authentication used */
#define IP_ESP_TRANS_LEVEL	21   /* u_char; transport encryption */
#define IP_ESP_NETWORK_LEVEL	22   /* u_char; full-packet encryption */

#if 0 /* NRL IPv6 */
#define IPV6_MULTICAST_IF	23   /* u_int; set/get multicast interface */
#define IPV6_MULTICAST_HOPS	24   /* int; set/get multicast hop limit */
#define IPV6_MULTICAST_LOOP	25   /* u_int; set/get multicast loopback */
#define IPV6_JOIN_GROUP		26   /* ipv6_mreq; join multicast group */
#define IPV6_ADD_MEMBERSHIP	IPV6_JOIN_GROUP /* XXX - for compatibility */
#define IPV6_LEAVE_GROUP	27   /* ipv6_mreq: leave multicast group */
#define IPV6_DROP_MEMBERSHIP	IPV6_LEAVE_GROUP /* XXX - for compatibility */
#define IPV6_ADDRFORM		28   /* int; get/set form of returned addrs */
#define IPV6_UNICAST_HOPS	29   /* int; get/set unicast hop limit */
#define IPV6_PKTINFO		30   /* int; receive in6_pktinfo as cmsg */
#define IPV6_HOPLIMIT		31   /* int; receive int hoplimit as cmsg */
#define IPV6_NEXTHOP		32   /* int; receive sockaddr_in6 as cmsg */
#define IPV6_HOPOPTS		33   /* int; receive hop options as cmsg */
#define IPV6_DSTOPTS		34   /* int; receive dst options as cmsg */
#define IPV6_RTHDR		35   /* int; receive routing header as cmsg */
#define IPV6_PKTOPTIONS		36   /* int; send/receive cmsgs for TCP */
#define IPV6_CHECKSUM		37   /* int; offset to place send checksum */
#define ICMPV6_FILTER		38   /* struct icmpv6_filter; get/set filter */
#define ICMP6_FILTER		ICMP6_FILTER
#endif

#define IPSEC_OUTSA		39   /* set the outbound SA for a socket */

#if 0 /*KAME IPSEC*/
#define IP_IPSEC_POLICY		?? /* struct; get/set security policy */
#endif

/*
 * Security levels - IPsec, not IPSO
 */

#define IPSEC_LEVEL_BYPASS      0x00    /* Bypass policy altogether */
#define IPSEC_LEVEL_NONE        0x00    /* Send clear, accept any */
#define IPSEC_LEVEL_AVAIL       0x01    /* Send secure if SA available */
#define IPSEC_LEVEL_USE         0x02    /* Send secure, accept any */
#define IPSEC_LEVEL_REQUIRE     0x03    /* Require secure inbound, also use */
#define IPSEC_LEVEL_UNIQUE      0x04    /* Use outbound SA that is unique */
#define IPSEC_LEVEL_DEFAULT     IPSEC_LEVEL_AVAIL

#define IPSEC_AUTH_LEVEL_DEFAULT IPSEC_LEVEL_DEFAULT
#define IPSEC_ESP_TRANS_LEVEL_DEFAULT IPSEC_LEVEL_DEFAULT
#define IPSEC_ESP_NETWORK_LEVEL_DEFAULT IPSEC_LEVEL_DEFAULT

#if 0 /* NRL IPv6 */
/*
 * IPv6 Routing header types
 */
#define IPV6_RTHDR_TYPE_0	0 /* IPv6 Routing header type 0 */   

#define IPV6_RTHDR_LOOSE	0 /* this hop need not be a neighbor */
#define IPV6_RTHDR_STRICT	1 /* this hop must be a neighbor */
#endif

/*
 * 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; must fit in one mbuf */

/*
 * 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 */
};

#if 0 /* NRL IPv6 */
/*
 * Argument structure for IPV6_ADD_MEMBERSHIP and IPV6_DROP_MEMBERSHIP.
 */
struct ipv6_mreq {
	struct	in6_addr	ipv6mr_multiaddr; /* IPv6 multicast addr */
	unsigned int		ipv6mr_interface; /* Interface index */
};

/*
 * Argument structure for IPV6_PKTINFO control messages
 */
struct in6_pktinfo {
	struct in6_addr ipi6_addr;
	unsigned int ipi6_ifindex;
};
#endif

/*
 * 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 */

/*
 * Buffer lengths for strings containing printable IP addresses
 */
#define INET_ADDRSTRLEN		16
#if 0 /* NRL IPv6 */
#define INET6_ADDRSTRLEN	46
#endif

/*
 * 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 */

#define	CTL_IPPROTO_NAMES { \
	{ "ip", CTLTYPE_NODE }, \
	{ "icmp", CTLTYPE_NODE }, \
	{ "igmp", CTLTYPE_NODE }, \
	{ "ggp", CTLTYPE_NODE }, \
	{ "ip4", CTLTYPE_NODE }, \
	{ 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 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ "esp", CTLTYPE_NODE }, \
	{ "ah", CTLTYPE_NODE }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ "etherip", 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 */
#ifdef notyet
#define	IPCTL_DEFMTU		4	/* default MTU */
#endif
#define	IPCTL_SOURCEROUTE	5	/* may perform source routes */
#define	IPCTL_DIRECTEDBCAST	6	/* default broadcast behavior */
#define IPCTL_IPPORT_FIRSTAUTO	7
#define IPCTL_IPPORT_LASTAUTO	8
#define IPCTL_IPPORT_HIFIRSTAUTO 9
#define IPCTL_IPPORT_HILASTAUTO	10
#define	IPCTL_IPPORT_MAXQUEUE	11
#define	IPCTL_ENCDEBUG		12
#define IPCTL_GIF_TTL		13	/* default TTL for gif encap packet */
#define	IPCTL_MAXID		14

#define	IPCTL_NAMES { \
	{ 0, 0 }, \
	{ "forwarding", CTLTYPE_INT }, \
	{ "redirect", CTLTYPE_INT }, \
	{ "ttl", CTLTYPE_INT }, \
	/* { "mtu", CTLTYPE_INT }, */ { 0, 0 }, \
	{ "sourceroute", CTLTYPE_INT }, \
	{ "directed-broadcast", CTLTYPE_INT }, \
	{ "portfirst", CTLTYPE_INT }, \
	{ "portlast", CTLTYPE_INT }, \
	{ "porthifirst", CTLTYPE_INT }, \
	{ "porthilast", CTLTYPE_INT }, \
	{ "maxqueue", CTLTYPE_INT }, \
	{ "encdebug", CTLTYPE_INT }, \
	{ "gifttl", CTLTYPE_INT }, \
}

/* INET6 stuff */
#include <netinet6/in6.h>

#ifndef _KERNEL

#include <sys/cdefs.h>

__BEGIN_DECLS
int	   bindresvport __P((int, struct sockaddr_in *));
int	   bindresvport_af __P((int, struct sockaddr *, int af));
__END_DECLS

#else
int	   in_broadcast __P((struct in_addr, struct ifnet *));
int	   in_canforward __P((struct in_addr));
int	   in_cksum __P((struct mbuf *, int));
int	   in_localaddr __P((struct in_addr));
void	   in_socktrim __P((struct sockaddr_in *));
char	  *inet_ntoa __P((struct in_addr));
char 	  *inet_ntoa_r __P((struct in_addr, char *));

#define	satosin(sa)	((struct sockaddr_in *)(sa))
#define	sintosa(sin)	((struct sockaddr *)(sin))
#define	ifatoia(ifa)	((struct in_ifaddr *)(ifa))
#endif
#endif /* !_NETINET_IN_H_ */