newlib/newlib/libc/sys/linux/include/netinet6/ip6_var.h - native_client/nacl-toolchain - Git at Google

 /*	$FreeBSD: src/sys/netinet6/ip6_var.h,v 1.8 2001/09/12 08:37:55 julian Exp $	*/
 /*	$KAME: ip6_var.h,v 1.62 2001/05/03 14:51:48 itojun Exp $	*/

 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
  * 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. Neither the name of the project 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 PROJECT 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 PROJECT 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.
  */

 /*
  * Copyright (c) 1982, 1986, 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.
  *
  *	@(#)ip_var.h	8.1 (Berkeley) 6/10/93
  */

 #ifndef _NETINET6_IP6_VAR_H_
 #define _NETINET6_IP6_VAR_H_

 /*
  * IP6 reassembly queue structure.  Each fragment
  * being reassembled is attached to one of these structures.
  */
 struct	ip6q {
 	u_int32_t	ip6q_head;
 	u_int16_t	ip6q_len;
 	u_int8_t	ip6q_nxt;	/* ip6f_nxt in first fragment */
 	u_int8_t	ip6q_hlim;
 	struct ip6asfrag *ip6q_down;
 	struct ip6asfrag *ip6q_up;
 	u_int32_t	ip6q_ident;
 	u_int8_t	ip6q_arrive;
 	u_int8_t	ip6q_ttl;
 	struct in6_addr	ip6q_src, ip6q_dst;
 	struct ip6q	*ip6q_next;
 	struct ip6q	*ip6q_prev;
 	int		ip6q_unfrglen;	/* len of unfragmentable part */
 #ifdef notyet
 	u_char		*ip6q_nxtp;
 #endif
 };

 struct	ip6asfrag {
 	u_int32_t	ip6af_head;
 	u_int16_t	ip6af_len;
 	u_int8_t	ip6af_nxt;
 	u_int8_t	ip6af_hlim;
 	/* must not override the above members during reassembling */
 	struct ip6asfrag *ip6af_down;
 	struct ip6asfrag *ip6af_up;
 	struct mbuf	*ip6af_m;
 	int		ip6af_offset;	/* offset in ip6af_m to next header */
 	int		ip6af_frglen;	/* fragmentable part length */
 	int		ip6af_off;	/* fragment offset */
 	u_int16_t	ip6af_mff;	/* more fragment bit in frag off */
 };

 #define IP6_REASS_MBUF(ip6af) (*(struct mbuf **)&((ip6af)->ip6af_m))

 struct	ip6_moptions {
 	struct	ifnet *im6o_multicast_ifp; /* ifp for outgoing multicasts */
 	u_char	im6o_multicast_hlim;	/* hoplimit for outgoing multicasts */
 	u_char	im6o_multicast_loop;	/* 1 >= hear sends if a member */
 	LIST_HEAD(, in6_multi_mship) im6o_memberships;
 };

 /*
  * Control options for outgoing packets
  */

 /* Routing header related info */
 struct	ip6po_rhinfo {
 	struct	ip6_rthdr *ip6po_rhi_rthdr; /* Routing header */
 	struct	route_in6 ip6po_rhi_route; /* Route to the 1st hop */
 };
 #define ip6po_rthdr	ip6po_rhinfo.ip6po_rhi_rthdr
 #define ip6po_route	ip6po_rhinfo.ip6po_rhi_route

 struct	ip6_pktopts {
 	struct	mbuf *ip6po_m;	/* Pointer to mbuf storing the data */
 	int	ip6po_hlim;	/* Hoplimit for outgoing packets */

 	/* Outgoing IF/address information */
 	struct	in6_pktinfo *ip6po_pktinfo;

 	struct	sockaddr *ip6po_nexthop; /* Next-hop address */

 	struct	ip6_hbh *ip6po_hbh; /* Hop-by-Hop options header */

 	/* Destination options header (before a routing header) */
 	struct	ip6_dest *ip6po_dest1;

 	/* Routing header related info. */
 	struct	ip6po_rhinfo ip6po_rhinfo;

 	/* Destination options header (after a routing header) */
 	struct	ip6_dest *ip6po_dest2;
 };

 /*
  * Control options for incoming packets
  */

 struct	ip6stat {
 	u_quad_t ip6s_total;		/* total packets received */
 	u_quad_t ip6s_tooshort;		/* packet too short */
 	u_quad_t ip6s_toosmall;		/* not enough data */
 	u_quad_t ip6s_fragments;	/* fragments received */
 	u_quad_t ip6s_fragdropped;	/* frags dropped(dups, out of space) */
 	u_quad_t ip6s_fragtimeout;	/* fragments timed out */
 	u_quad_t ip6s_fragoverflow;	/* fragments that exceeded limit */
 	u_quad_t ip6s_forward;		/* packets forwarded */
 	u_quad_t ip6s_cantforward;	/* packets rcvd for unreachable dest */
 	u_quad_t ip6s_redirectsent;	/* packets forwarded on same net */
 	u_quad_t ip6s_delivered;	/* datagrams delivered to upper level*/
 	u_quad_t ip6s_localout;		/* total ip packets generated here */
 	u_quad_t ip6s_odropped;		/* lost packets due to nobufs, etc. */
 	u_quad_t ip6s_reassembled;	/* total packets reassembled ok */
 	u_quad_t ip6s_fragmented;	/* datagrams sucessfully fragmented */
 	u_quad_t ip6s_ofragments;	/* output fragments created */
 	u_quad_t ip6s_cantfrag;		/* don't fragment flag was set, etc. */
 	u_quad_t ip6s_badoptions;	/* error in option processing */
 	u_quad_t ip6s_noroute;		/* packets discarded due to no route */
 	u_quad_t ip6s_badvers;		/* ip6 version != 6 */
 	u_quad_t ip6s_rawout;		/* total raw ip packets generated */
 	u_quad_t ip6s_badscope;		/* scope error */
 	u_quad_t ip6s_notmember;	/* don't join this multicast group */
 	u_quad_t ip6s_nxthist[256];	/* next header history */
 	u_quad_t ip6s_m1;		/* one mbuf */
 	u_quad_t ip6s_m2m[32];		/* two or more mbuf */
 	u_quad_t ip6s_mext1;		/* one ext mbuf */
 	u_quad_t ip6s_mext2m;		/* two or more ext mbuf */
 	u_quad_t ip6s_exthdrtoolong;	/* ext hdr are not continuous */
 	u_quad_t ip6s_nogif;		/* no match gif found */
 	u_quad_t ip6s_toomanyhdr;	/* discarded due to too many headers */

 	/*
 	 * statistics for improvement of the source address selection
 	 * algorithm:
 	 * XXX: hardcoded 16 = # of ip6 multicast scope types + 1
 	 */
 	/* number of times that address selection fails */
 	u_quad_t ip6s_sources_none;
 	/* number of times that an address on the outgoing I/F is chosen */
 	u_quad_t ip6s_sources_sameif[16];
 	/* number of times that an address on a non-outgoing I/F is chosen */
 	u_quad_t ip6s_sources_otherif[16];
 	/*
 	 * number of times that an address that has the same scope
 	 * from the destination is chosen.
 	 */
 	u_quad_t ip6s_sources_samescope[16];
 	/*
 	 * number of times that an address that has a different scope
 	 * from the destination is chosen.
 	 */
 	u_quad_t ip6s_sources_otherscope[16];
 	/* number of times that an deprecated address is chosen */
 	u_quad_t ip6s_sources_deprecated[16];

 	u_quad_t ip6s_forward_cachehit;
 	u_quad_t ip6s_forward_cachemiss;
 };

 #ifdef _KERNEL
 /*
  * IPv6 onion peeling state.
  * it will be initialized when we come into ip6_input().
  * XXX do not make it a kitchen sink!
  */
 struct ip6aux {
 	u_int32_t ip6a_flags;
 #define IP6A_SWAP	0x01		/* swapped home/care-of on packet */
 #define IP6A_HASEEN	0x02		/* HA was present */
 #define IP6A_BRUID	0x04		/* BR Unique Identifier was present */
 #define IP6A_RTALERTSEEN 0x08		/* rtalert present */

 	/* ip6.ip6_src */
 	struct in6_addr ip6a_careof;	/* care-of address of the peer */
 	struct in6_addr ip6a_home;	/* home address of the peer */
 	u_int16_t	ip6a_bruid;	/* BR unique identifier */

 	/* ip6.ip6_dst */
 	struct in6_ifaddr *ip6a_dstia6;	/* my ifaddr that matches ip6_dst */

 	/* rtalert */
 	u_int16_t ip6a_rtalert;		/* rtalert option value */

 	/*
 	 * decapsulation history will be here.
 	 * with IPsec it may not be accurate.
 	 */
 };
 #endif

 #ifdef _KERNEL
 /* flags passed to ip6_output as last parameter */
 #define	IPV6_DADOUTPUT		0x01	/* DAD */
 #define	IPV6_FORWARDING		0x02	/* most of IPv6 header exists */
 #define	IPV6_MINMTU		0x04	/* use minimum MTU (IPV6_USE_MIN_MTU) */

 extern struct	ip6stat ip6stat;	/* statistics */
 extern u_int32_t ip6_id;		/* fragment identifier */
 extern int	ip6_defhlim;		/* default hop limit */
 extern int	ip6_defmcasthlim;	/* default multicast hop limit */
 extern int	ip6_forwarding;		/* act as router? */
 extern int	ip6_forward_srcrt;	/* forward src-routed? */
 extern int	ip6_gif_hlim;		/* Hop limit for gif encap packet */
 extern int	ip6_use_deprecated;	/* allow deprecated addr as source */
 extern int	ip6_rr_prune;		/* router renumbering prefix
 					 * walk list every 5 sec.    */
 #define ip6_mapped_addr_on	(!ip6_v6only)
 extern int	ip6_v6only;

 extern struct socket *ip6_mrouter; 	/* multicast routing daemon */
 extern int	ip6_sendredirects;	/* send IP redirects when forwarding? */
 extern int	ip6_maxfragpackets; /* Maximum packets in reassembly queue */
 extern int	ip6_sourcecheck;	/* Verify source interface */
 extern int	ip6_sourcecheck_interval; /* Interval between log messages */
 extern int	ip6_accept_rtadv;	/* Acts as a host not a router */
 extern int	ip6_keepfaith;		/* Firewall Aided Internet Translator */
 extern int	ip6_log_interval;
 extern time_t	ip6_log_time;
 extern int	ip6_hdrnestlimit; /* upper limit of # of extension headers */
 extern int	ip6_dad_count;		/* DupAddrDetectionTransmits */

 extern u_int32_t ip6_flow_seq;
 extern int ip6_auto_flowlabel;
 extern int ip6_auto_linklocal;

 extern int   ip6_anonportmin;		/* minimum ephemeral port */
 extern int   ip6_anonportmax;		/* maximum ephemeral port */
 extern int   ip6_lowportmin;		/* minimum reserved port */
 extern int   ip6_lowportmax;		/* maximum reserved port */

 extern int	ip6_use_tempaddr; /* whether to use temporary addresses. */

 extern struct	pr_usrreqs rip6_usrreqs;
 struct sockopt;

 struct inpcb;

 int	icmp6_ctloutput __P((struct socket *, struct sockopt *sopt));

 struct in6_ifaddr;
 void	ip6_init __P((void));
 void	ip6intr __P((void));
 void	ip6_input __P((struct mbuf *));
 struct in6_ifaddr *ip6_getdstifaddr __P((struct mbuf *));
 void	ip6_freepcbopts __P((struct ip6_pktopts *));
 void	ip6_freemoptions __P((struct ip6_moptions *));
 int	ip6_unknown_opt __P((u_int8_t *, struct mbuf *, int));
 char *	ip6_get_prevhdr __P((struct mbuf *, int));
 int	ip6_nexthdr __P((struct mbuf *, int, int, int *));
 int	ip6_lasthdr __P((struct mbuf *, int, int, int *));

 struct mbuf *ip6_addaux __P((struct mbuf *));
 struct mbuf *ip6_findaux __P((struct mbuf *));
 void	ip6_delaux __P((struct mbuf *));

 int	ip6_mforward __P((struct ip6_hdr *, struct ifnet *, struct mbuf *));
 int	ip6_process_hopopts __P((struct mbuf *, u_int8_t *, int, u_int32_t *,
 				 u_int32_t *));
 void	ip6_savecontrol __P((struct inpcb *, struct mbuf **, struct ip6_hdr *,
 			     struct mbuf *));
 void	ip6_notify_pmtu __P((struct inpcb *, struct sockaddr_in6 *,
 			     u_int32_t *));
 int	ip6_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));

 void	ip6_forward __P((struct mbuf *, int));

 void	ip6_mloopback __P((struct ifnet *, struct mbuf *, struct sockaddr_in6 *));
 int	ip6_output __P((struct mbuf *, struct ip6_pktopts *,
 			struct route_in6 *,
 			int,
 			struct ip6_moptions *, struct ifnet **));
 int	ip6_ctloutput __P((struct socket *, struct sockopt *sopt));
 void	init_ip6pktopts __P((struct ip6_pktopts *));
 int	ip6_setpktoptions __P((struct mbuf *, struct ip6_pktopts *, int, int));
 void	ip6_clearpktopts __P((struct ip6_pktopts *, int, int));
 struct ip6_pktopts *ip6_copypktopts __P((struct ip6_pktopts *, int));
 int	ip6_optlen __P((struct inpcb *));

 int	route6_input __P((struct mbuf **, int *, int));

 void	frag6_init __P((void));
 int	frag6_input __P((struct mbuf **, int *, int));
 void	frag6_slowtimo __P((void));
 void	frag6_drain __P((void));

 void	rip6_init __P((void));
 int	rip6_input __P((struct mbuf **mp, int *offp, int proto));
 void	rip6_ctlinput __P((int, struct sockaddr *, void *));
 int	rip6_ctloutput __P((struct socket *so, struct sockopt *sopt));
 int	rip6_output __P((struct mbuf *, ...));
 int	rip6_usrreq __P((struct socket *,
 	    int, struct mbuf *, struct mbuf *, struct mbuf *, struct thread *));

 int	dest6_input __P((struct mbuf **, int *, int));
 int	none_input __P((struct mbuf **, int *, int));
 #endif /* _KERNEL */

 #endif /* !_NETINET6_IP6_VAR_H_ */
	/* $FreeBSD: src/sys/netinet6/ip6_var.h,v 1.8 2001/09/12 08:37:55 julian Exp $ */
	/* $KAME: ip6_var.h,v 1.62 2001/05/03 14:51:48 itojun Exp $ */

	/*
	* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
	* 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. Neither the name of the project 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 PROJECT 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 PROJECT 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.
	*/

	/*
	* Copyright (c) 1982, 1986, 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.
	*
	* @(#)ip_var.h 8.1 (Berkeley) 6/10/93
	*/

	#ifndef _NETINET6_IP6_VAR_H_
	#define _NETINET6_IP6_VAR_H_

	/*
	* IP6 reassembly queue structure. Each fragment
	* being reassembled is attached to one of these structures.
	*/
	struct ip6q {
	u_int32_t ip6q_head;
	u_int16_t ip6q_len;
	u_int8_t ip6q_nxt; /* ip6f_nxt in first fragment */
	u_int8_t ip6q_hlim;
	struct ip6asfrag *ip6q_down;
	struct ip6asfrag *ip6q_up;
	u_int32_t ip6q_ident;
	u_int8_t ip6q_arrive;
	u_int8_t ip6q_ttl;
	struct in6_addr ip6q_src, ip6q_dst;
	struct ip6q *ip6q_next;
	struct ip6q *ip6q_prev;
	int ip6q_unfrglen; /* len of unfragmentable part */
	#ifdef notyet
	u_char *ip6q_nxtp;
	#endif
	};

	struct ip6asfrag {
	u_int32_t ip6af_head;
	u_int16_t ip6af_len;
	u_int8_t ip6af_nxt;
	u_int8_t ip6af_hlim;
	/* must not override the above members during reassembling */
	struct ip6asfrag *ip6af_down;
	struct ip6asfrag *ip6af_up;
	struct mbuf *ip6af_m;
	int ip6af_offset; /* offset in ip6af_m to next header */
	int ip6af_frglen; /* fragmentable part length */
	int ip6af_off; /* fragment offset */
	u_int16_t ip6af_mff; /* more fragment bit in frag off */
	};

	#define IP6_REASS_MBUF(ip6af) ((struct mbuf *)&((ip6af)->ip6af_m))

	struct ip6_moptions {
	struct ifnet im6o_multicast_ifp; / ifp for outgoing multicasts */
	u_char im6o_multicast_hlim; /* hoplimit for outgoing multicasts */
	u_char im6o_multicast_loop; /* 1 >= hear sends if a member */
	LIST_HEAD(, in6_multi_mship) im6o_memberships;
	};

	/*
	* Control options for outgoing packets
	*/

	/* Routing header related info */
	struct ip6po_rhinfo {
	struct ip6_rthdr ip6po_rhi_rthdr; / Routing header */
	struct route_in6 ip6po_rhi_route; /* Route to the 1st hop */
	};
	#define ip6po_rthdr ip6po_rhinfo.ip6po_rhi_rthdr
	#define ip6po_route ip6po_rhinfo.ip6po_rhi_route

	struct ip6_pktopts {
	struct mbuf ip6po_m; / Pointer to mbuf storing the data */
	int ip6po_hlim; /* Hoplimit for outgoing packets */

	/* Outgoing IF/address information */
	struct in6_pktinfo *ip6po_pktinfo;

	struct sockaddr ip6po_nexthop; / Next-hop address */

	struct ip6_hbh ip6po_hbh; / Hop-by-Hop options header */

	/* Destination options header (before a routing header) */
	struct ip6_dest *ip6po_dest1;

	/* Routing header related info. */
	struct ip6po_rhinfo ip6po_rhinfo;

	/* Destination options header (after a routing header) */
	struct ip6_dest *ip6po_dest2;
	};

	/*
	* Control options for incoming packets
	*/

	struct ip6stat {
	u_quad_t ip6s_total; /* total packets received */
	u_quad_t ip6s_tooshort; /* packet too short */
	u_quad_t ip6s_toosmall; /* not enough data */
	u_quad_t ip6s_fragments; /* fragments received */
	u_quad_t ip6s_fragdropped; /* frags dropped(dups, out of space) */
	u_quad_t ip6s_fragtimeout; /* fragments timed out */
	u_quad_t ip6s_fragoverflow; /* fragments that exceeded limit */
	u_quad_t ip6s_forward; /* packets forwarded */
	u_quad_t ip6s_cantforward; /* packets rcvd for unreachable dest */
	u_quad_t ip6s_redirectsent; /* packets forwarded on same net */
	u_quad_t ip6s_delivered; /* datagrams delivered to upper level*/
	u_quad_t ip6s_localout; /* total ip packets generated here */
	u_quad_t ip6s_odropped; /* lost packets due to nobufs, etc. */
	u_quad_t ip6s_reassembled; /* total packets reassembled ok */
	u_quad_t ip6s_fragmented; /* datagrams sucessfully fragmented */
	u_quad_t ip6s_ofragments; /* output fragments created */
	u_quad_t ip6s_cantfrag; /* don't fragment flag was set, etc. */
	u_quad_t ip6s_badoptions; /* error in option processing */
	u_quad_t ip6s_noroute; /* packets discarded due to no route */
	u_quad_t ip6s_badvers; /* ip6 version != 6 */
	u_quad_t ip6s_rawout; /* total raw ip packets generated */
	u_quad_t ip6s_badscope; /* scope error */
	u_quad_t ip6s_notmember; /* don't join this multicast group */
	u_quad_t ip6s_nxthist[256]; /* next header history */
	u_quad_t ip6s_m1; /* one mbuf */
	u_quad_t ip6s_m2m[32]; /* two or more mbuf */
	u_quad_t ip6s_mext1; /* one ext mbuf */
	u_quad_t ip6s_mext2m; /* two or more ext mbuf */
	u_quad_t ip6s_exthdrtoolong; /* ext hdr are not continuous */
	u_quad_t ip6s_nogif; /* no match gif found */
	u_quad_t ip6s_toomanyhdr; /* discarded due to too many headers */

	/*
	* statistics for improvement of the source address selection
	* algorithm:
	* XXX: hardcoded 16 = # of ip6 multicast scope types + 1
	*/
	/* number of times that address selection fails */
	u_quad_t ip6s_sources_none;
	/* number of times that an address on the outgoing I/F is chosen */
	u_quad_t ip6s_sources_sameif[16];
	/* number of times that an address on a non-outgoing I/F is chosen */
	u_quad_t ip6s_sources_otherif[16];
	/*
	* number of times that an address that has the same scope
	* from the destination is chosen.
	*/
	u_quad_t ip6s_sources_samescope[16];
	/*
	* number of times that an address that has a different scope
	* from the destination is chosen.
	*/
	u_quad_t ip6s_sources_otherscope[16];
	/* number of times that an deprecated address is chosen */
	u_quad_t ip6s_sources_deprecated[16];

	u_quad_t ip6s_forward_cachehit;
	u_quad_t ip6s_forward_cachemiss;
	};

	#ifdef _KERNEL
	/*
	* IPv6 onion peeling state.
	* it will be initialized when we come into ip6_input().
	* XXX do not make it a kitchen sink!
	*/
	struct ip6aux {
	u_int32_t ip6a_flags;
	#define IP6A_SWAP 0x01 /* swapped home/care-of on packet */
	#define IP6A_HASEEN 0x02 /* HA was present */
	#define IP6A_BRUID 0x04 /* BR Unique Identifier was present */
	#define IP6A_RTALERTSEEN 0x08 /* rtalert present */

	/* ip6.ip6_src */
	struct in6_addr ip6a_careof; /* care-of address of the peer */
	struct in6_addr ip6a_home; /* home address of the peer */
	u_int16_t ip6a_bruid; /* BR unique identifier */

	/* ip6.ip6_dst */
	struct in6_ifaddr ip6a_dstia6; / my ifaddr that matches ip6_dst */

	/* rtalert */
	u_int16_t ip6a_rtalert; /* rtalert option value */

	/*
	* decapsulation history will be here.
	* with IPsec it may not be accurate.
	*/
	};
	#endif

	#ifdef _KERNEL
	/* flags passed to ip6_output as last parameter */
	#define IPV6_DADOUTPUT 0x01 /* DAD */
	#define IPV6_FORWARDING 0x02 /* most of IPv6 header exists */
	#define IPV6_MINMTU 0x04 /* use minimum MTU (IPV6_USE_MIN_MTU) */

	extern struct ip6stat ip6stat; /* statistics */
	extern u_int32_t ip6_id; /* fragment identifier */
	extern int ip6_defhlim; /* default hop limit */
	extern int ip6_defmcasthlim; /* default multicast hop limit */
	extern int ip6_forwarding; /* act as router? */
	extern int ip6_forward_srcrt; /* forward src-routed? */
	extern int ip6_gif_hlim; /* Hop limit for gif encap packet */
	extern int ip6_use_deprecated; /* allow deprecated addr as source */
	extern int ip6_rr_prune; /* router renumbering prefix
	* walk list every 5 sec. */
	#define ip6_mapped_addr_on (!ip6_v6only)
	extern int ip6_v6only;

	extern struct socket ip6_mrouter; / multicast routing daemon */
	extern int ip6_sendredirects; /* send IP redirects when forwarding? */
	extern int ip6_maxfragpackets; /* Maximum packets in reassembly queue */
	extern int ip6_sourcecheck; /* Verify source interface */
	extern int ip6_sourcecheck_interval; /* Interval between log messages */
	extern int ip6_accept_rtadv; /* Acts as a host not a router */
	extern int ip6_keepfaith; /* Firewall Aided Internet Translator */
	extern int ip6_log_interval;
	extern time_t ip6_log_time;
	extern int ip6_hdrnestlimit; /* upper limit of # of extension headers */
	extern int ip6_dad_count; /* DupAddrDetectionTransmits */

	extern u_int32_t ip6_flow_seq;
	extern int ip6_auto_flowlabel;
	extern int ip6_auto_linklocal;

	extern int ip6_anonportmin; /* minimum ephemeral port */
	extern int ip6_anonportmax; /* maximum ephemeral port */
	extern int ip6_lowportmin; /* minimum reserved port */
	extern int ip6_lowportmax; /* maximum reserved port */

	extern int ip6_use_tempaddr; /* whether to use temporary addresses. */

	extern struct pr_usrreqs rip6_usrreqs;
	struct sockopt;

	struct inpcb;

	int icmp6_ctloutput __P((struct socket , struct sockopt sopt));

	struct in6_ifaddr;
	void ip6_init __P((void));
	void ip6intr __P((void));
	void ip6_input __P((struct mbuf *));
	struct in6_ifaddr ip6_getdstifaddr __P((struct mbuf ));
	void ip6_freepcbopts __P((struct ip6_pktopts *));
	void ip6_freemoptions __P((struct ip6_moptions *));
	int ip6_unknown_opt __P((u_int8_t , struct mbuf , int));
	char * ip6_get_prevhdr __P((struct mbuf *, int));
	int ip6_nexthdr __P((struct mbuf , int, int, int ));
	int ip6_lasthdr __P((struct mbuf , int, int, int ));

	struct mbuf ip6_addaux __P((struct mbuf ));
	struct mbuf ip6_findaux __P((struct mbuf ));
	void ip6_delaux __P((struct mbuf *));

	int ip6_mforward __P((struct ip6_hdr , struct ifnet , struct mbuf *));
	int ip6_process_hopopts __P((struct mbuf , u_int8_t , int, u_int32_t *,
	u_int32_t *));
	void ip6_savecontrol __P((struct inpcb , struct mbuf , struct ip6_hdr ,
	struct mbuf *));
	void ip6_notify_pmtu __P((struct inpcb , struct sockaddr_in6 ,
	u_int32_t *));
	int ip6_sysctl __P((int , u_int, void , size_t , void , size_t));

	void ip6_forward __P((struct mbuf *, int));

	void ip6_mloopback __P((struct ifnet , struct mbuf , struct sockaddr_in6 *));
	int ip6_output __P((struct mbuf , struct ip6_pktopts ,
	struct route_in6 *,
	int,
	struct ip6_moptions , struct ifnet *));
	int ip6_ctloutput __P((struct socket , struct sockopt sopt));
	void init_ip6pktopts __P((struct ip6_pktopts *));
	int ip6_setpktoptions __P((struct mbuf , struct ip6_pktopts , int, int));
	void ip6_clearpktopts __P((struct ip6_pktopts *, int, int));
	struct ip6_pktopts ip6_copypktopts __P((struct ip6_pktopts , int));
	int ip6_optlen __P((struct inpcb *));

	int route6_input __P((struct mbuf *, int , int));

	void frag6_init __P((void));
	int frag6_input __P((struct mbuf *, int , int));
	void frag6_slowtimo __P((void));
	void frag6_drain __P((void));

	void rip6_init __P((void));
	int rip6_input __P((struct mbuf *mp, int offp, int proto));
	void rip6_ctlinput __P((int, struct sockaddr , void ));
	int rip6_ctloutput __P((struct socket so, struct sockopt sopt));
	int rip6_output __P((struct mbuf *, ...));
	int rip6_usrreq __P((struct socket *,
	int, struct mbuf , struct mbuf , struct mbuf , struct thread ));

	int dest6_input __P((struct mbuf *, int , int));
	int none_input __P((struct mbuf *, int , int));
	#endif /* _KERNEL */

	#endif /* !_NETINET6_IP6_VAR_H_ */