text: /*	$FreeBSD: src/sys/netinet6/ip6_var.h,v 1.2.2.4 2003/01/23 21:06:47 sam Exp $	*/
  /*	$DragonFly: src/sys/netinet6/ip6_var.h,v 1.13 2008/09/04 09:08:22 hasso 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_
  
  #ifndef _SYS_TYPES_H_
  #include <sys/types.h>
  #endif
  #ifndef _SYS_QUEUE_H_
  #include <sys/queue.h>
  #endif
  #ifndef _NETINET_IN_H_
  #include <netinet/in.h>
  #endif
  
  /*
   * 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
  
  /* Nexthop related info */
  struct	ip6po_nhinfo {
  	struct	sockaddr *ip6po_nhi_nexthop;
  	struct	route_in6 ip6po_nhi_route; /* Route to the nexthop */
  };
  #define ip6po_nexthop	ip6po_nhinfo.ip6po_nhi_nexthop
  #define ip6po_nextroute	ip6po_nhinfo.ip6po_nhi_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;
  
  	/* Next-hop address information */
  	struct	ip6po_nhinfo ip6po_nhinfo;
  	
  	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;
  	/*
  	 * below fields are introduced in RFC3542
  	 */
  	int	ip6po_tclass;	/* traffic class */
  	int	ip6po_minmtu;  /* fragment vs PMTU discovery policy */
  #define IP6PO_MINMTU_MCASTONLY	-1 /* default; send at min MTU for multicast*/
  #define IP6PO_MINMTU_DISABLE	 0 /* always perform pmtu disc */
  #define IP6PO_MINMTU_ALL	 1 /* always send at min MTU */
  	int	ip6po_prefer_tempaddr;  /* whether temporary addresses are
  					   preferred as source address */
  #define IP6PO_TEMPADDR_SYSTEM	-1 /* follow the system default */
  #define IP6PO_TEMPADDR_NOTPREFER 0 /* not prefer temporary address */
  #define IP6PO_TEMPADDR_PREFER	 1 /* prefer temporary address */
  
  	int ip6po_flags;
  #if 0	/* Parameters in this block are obsolete. Do not reuse the values. */
  #define IP6PO_REACHCONF	0x01	/* upper-layer reachability confirmation. */
  #define IP6PO_MINMTU	0x02	/* use minimum MTU (IPV6_USE_MIN_MTU) */
  #endif
  #define IP6PO_DONTFRAG	0x04	/* disable fragmentation (IPV6_DONTFRAG) */
  #define IP6PO_USECOA	0x08	/* use care of address */
  };
  
  /*
   * 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 successfully 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) */
  
  /* direction passed to ip_hashfn as last parameter */
  #define IP6_MPORT_IN		0 /* Find lwkt port for incoming packets */
  #define IP6_MPORT_OUT		1 /* Find lwkt port for outgoing packets */
  
  extern struct	ip6stat ip6stat;	/* statistics */
  extern u_int32_t ip6_id;		/* fragment identifier */
  extern int	ip6_minhlim;		/* minimum hop limit */
  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.    */
  
  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 pfil_head inet6_pfil_hook;
  
  extern struct	pr_usrreqs rip6_usrreqs;
  
  struct proc;
  struct inpcb;
  struct sockopt;
  struct in6_ifaddr;
  struct ip6_hdr;
  union netmsg;
  
  void	icmp6_ctloutput (union netmsg *);
  
  void	ip6_init (void);
  void	ip6intr (void);
  struct in6_ifaddr *ip6_getdstifaddr (struct mbuf *);
  void	ip6_freepcbopts (struct ip6_pktopts *);
  void	ip6_freemoptions (struct ip6_moptions *);
  int	ip6_unknown_opt (u_int8_t *, struct mbuf *, int);
  char *	ip6_get_prevhdr (struct mbuf *, int);
  int	ip6_nexthdr (struct mbuf *, int, int, int *);
  int	ip6_lasthdr (struct mbuf *, int, int, int *);
  
  struct ip6aux *ip6_addaux (struct mbuf *);
  struct ip6aux *ip6_findaux (struct mbuf *);
  void	ip6_delaux (struct mbuf *);
  
  int	ip6_mforward (struct ip6_hdr *, struct ifnet *, struct mbuf *);
  int	ip6_process_hopopts (struct mbuf *, u_int8_t *, int, u_int32_t *,
  				 u_int32_t *);
  void	ip6_savecontrol (struct inpcb *, struct mbuf **, struct ip6_hdr *,
  			     struct mbuf *);
  void	ip6_notify_pmtu (struct inpcb *, struct sockaddr_in6 *,
  			     u_int32_t *);
  int	ip6_sysctl (int *, u_int, void *, size_t *, void *, size_t);
  
  void	ip6_forward (struct mbuf *, int);
  
  void	ip6_mloopback (struct ifnet *, struct mbuf *, struct sockaddr_in6 *);
  int	ip6_output (struct mbuf *, struct ip6_pktopts *,
  			struct route_in6 *,
  			int,
  			struct ip6_moptions *, struct ifnet **,
  			struct inpcb *);
  void	ip6_ctloutput_dispatch(netmsg_t msg);
  int	ip6_ctloutput (struct socket *, struct sockopt *sopt);
  int	ip6_raw_ctloutput (struct socket *, struct sockopt *);
  void	init_ip6pktopts (struct ip6_pktopts *);
  int
  ip6_setpktoptions(struct mbuf *, struct ip6_pktopts *,
      struct ip6_pktopts *, int , int);
  void	ip6_clearpktopts (struct ip6_pktopts *, int);
  struct ip6_pktopts *ip6_copypktopts (struct ip6_pktopts *, int);
  int	ip6_optlen (struct inpcb *);
  
  int	route6_input (struct mbuf **, int *, int);
  
  void	frag6_init (void);
  int	frag6_input (struct mbuf **, int *, int);
  void	frag6_slowtimo (void);
  void	frag6_drain (void);
  
  void	rip6_init (void);
  int	rip6_input (struct mbuf **mp, int *offp, int proto);
  void	rip6_ctlinput (union netmsg *);
  void	rip6_ctloutput (union netmsg *);
  int	rip6_output (struct mbuf *, struct socket *, ...);
  int	rip6_usrreq (struct socket *,
  	    int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *);
  
  int	dest6_input (struct mbuf **, int *, int);
  int	none_input (struct mbuf **, int *, int);
  #endif /* _KERNEL */
  
  #endif /* !_NETINET6_IP6_VAR_H_ */
  