text: /*-
   * 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.
   *
   *	$KAME: ip6_var.h,v 1.62 2001/05/03 14:51:48 itojun Exp $
   */
  
  /*-
   * 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.
   * 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
   * $FreeBSD: soc2013/dpl/head/sys/netinet6/ip6_var.h 250753 2013-04-16 16:59:29Z tijl $
   */
  
  #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 {
  	struct ip6asfrag *ip6q_down;
  	struct ip6asfrag *ip6q_up;
  	u_int32_t	ip6q_ident;
  	u_int8_t	ip6q_nxt;
  	u_int8_t	ip6q_ecn;
  	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
  	int		ip6q_nfrag;	/* # of fragments */
  	struct label	*ip6q_label;
  };
  
  struct	ip6asfrag {
  	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))
  
  /*
   * Structure attached to inpcb.in6p_moptions and
   * passed to ip6_output when IPv6 multicast options are in use.
   * This structure is lazy-allocated.
   */
  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 */
  	u_short	im6o_num_memberships;	/* no. memberships this socket */
  	u_short	im6o_max_memberships;	/* max memberships this socket */
  	struct	in6_multi **im6o_membership;	/* group memberships */
  	struct	in6_mfilter *im6o_mfilters;	/* source filters */
  };
  
  /*
   * 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;
  
  	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 is 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 */
  #define	IP6S_HDRCNT		256	/* headers count */
  	u_quad_t ip6s_nxthist[IP6S_HDRCNT]; /* next header history */
  	u_quad_t ip6s_m1;		/* one mbuf */
  #define	IP6S_M2MMAX		32
  	u_quad_t ip6s_m2m[IP6S_M2MMAX];	/* 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 contiguous */
  	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
  	 */
  #define	IP6S_RULESMAX		16
  #define	IP6S_SCOPECNT		16
  	/* 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[IP6S_SCOPECNT];
  	/* number of times that an address on a non-outgoing I/F is chosen */
  	u_quad_t ip6s_sources_otherif[IP6S_SCOPECNT];
  	/*
  	 * number of times that an address that has the same scope
  	 * from the destination is chosen.
  	 */
  	u_quad_t ip6s_sources_samescope[IP6S_SCOPECNT];
  	/*
  	 * number of times that an address that has a different scope
  	 * from the destination is chosen.
  	 */
  	u_quad_t ip6s_sources_otherscope[IP6S_SCOPECNT];
  	/* number of times that a deprecated address is chosen */
  	u_quad_t ip6s_sources_deprecated[IP6S_SCOPECNT];
  
  	/* number of times that each rule of source selection is applied. */
  	u_quad_t ip6s_sources_rule[IP6S_RULESMAX];
  };
  
  #ifdef _KERNEL
  #define	IP6STAT_ADD(name, val)	V_ip6stat.name += (val)
  #define	IP6STAT_SUB(name, val)	V_ip6stat.name -= (val)
  #define	IP6STAT_INC(name)	IP6STAT_ADD(name, 1)
  #define	IP6STAT_DEC(name)	IP6STAT_SUB(name, 1)
  #endif
  
  #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_UNSPECSRC		0x01	/* allow :: as the source address */
  #define	IPV6_FORWARDING		0x02	/* most of IPv6 header exists */
  #define	IPV6_MINMTU		0x04	/* use minimum MTU (IPV6_USE_MIN_MTU) */
  
  #define	M_IP6_NEXTHOP		M_PROTO7	/* explicit ip nexthop */
  
  #ifdef __NO_STRICT_ALIGNMENT
  #define IP6_HDR_ALIGNED_P(ip)	1
  #else
  #define IP6_HDR_ALIGNED_P(ip)	((((intptr_t) (ip)) & 3) == 0)
  #endif
  
  VNET_DECLARE(struct ip6stat, ip6stat);	/* statistics */
  VNET_DECLARE(int, ip6_defhlim);		/* default hop limit */
  VNET_DECLARE(int, ip6_defmcasthlim);	/* default multicast hop limit */
  VNET_DECLARE(int, ip6_forwarding);	/* act as router? */
  VNET_DECLARE(int, ip6_use_deprecated);	/* allow deprecated addr as source */
  VNET_DECLARE(int, ip6_rr_prune);	/* router renumbering prefix
  					 * walk list every 5 sec.    */
  VNET_DECLARE(int, ip6_mcast_pmtu);	/* enable pMTU discovery for multicast? */
  VNET_DECLARE(int, ip6_v6only);
  #define	V_ip6stat			VNET(ip6stat)
  #define	V_ip6_defhlim			VNET(ip6_defhlim)
  #define	V_ip6_defmcasthlim		VNET(ip6_defmcasthlim)
  #define	V_ip6_forwarding		VNET(ip6_forwarding)
  #define	V_ip6_use_deprecated		VNET(ip6_use_deprecated)
  #define	V_ip6_rr_prune			VNET(ip6_rr_prune)
  #define	V_ip6_mcast_pmtu		VNET(ip6_mcast_pmtu)
  #define	V_ip6_v6only			VNET(ip6_v6only)
  
  VNET_DECLARE(struct socket *, ip6_mrouter);	/* multicast routing daemon */
  VNET_DECLARE(int, ip6_sendredirects);	/* send IP redirects when forwarding? */
  VNET_DECLARE(int, ip6_maxfragpackets);	/* Maximum packets in reassembly
  					 * queue */
  VNET_DECLARE(int, ip6_maxfrags);	/* Maximum fragments in reassembly
  					 * queue */
  VNET_DECLARE(int, ip6_accept_rtadv);	/* Acts as a host not a router */
  VNET_DECLARE(int, ip6_no_radr);		/* No defroute from RA */
  VNET_DECLARE(int, ip6_norbit_raif);	/* Disable R-bit in NA on RA
  					 * receiving IF. */
  VNET_DECLARE(int, ip6_rfc6204w3);	/* Accept defroute from RA even when
  					   forwarding enabled */
  VNET_DECLARE(int, ip6_keepfaith);	/* Firewall Aided Internet Translator */
  VNET_DECLARE(int, ip6_log_interval);
  VNET_DECLARE(time_t, ip6_log_time);
  VNET_DECLARE(int, ip6_hdrnestlimit);	/* upper limit of # of extension
  					 * headers */
  VNET_DECLARE(int, ip6_dad_count);	/* DupAddrDetectionTransmits */
  #define	V_ip6_mrouter			VNET(ip6_mrouter)
  #define	V_ip6_sendredirects		VNET(ip6_sendredirects)
  #define	V_ip6_maxfragpackets		VNET(ip6_maxfragpackets)
  #define	V_ip6_maxfrags			VNET(ip6_maxfrags)
  #define	V_ip6_accept_rtadv		VNET(ip6_accept_rtadv)
  #define	V_ip6_no_radr			VNET(ip6_no_radr)
  #define	V_ip6_norbit_raif		VNET(ip6_norbit_raif)
  #define	V_ip6_rfc6204w3			VNET(ip6_rfc6204w3)
  #define	V_ip6_keepfaith			VNET(ip6_keepfaith)
  #define	V_ip6_log_interval		VNET(ip6_log_interval)
  #define	V_ip6_log_time			VNET(ip6_log_time)
  #define	V_ip6_hdrnestlimit		VNET(ip6_hdrnestlimit)
  #define	V_ip6_dad_count			VNET(ip6_dad_count)
  
  VNET_DECLARE(int, ip6_auto_flowlabel);
  VNET_DECLARE(int, ip6_auto_linklocal);
  #define	V_ip6_auto_flowlabel		VNET(ip6_auto_flowlabel)
  #define	V_ip6_auto_linklocal		VNET(ip6_auto_linklocal)
  
  VNET_DECLARE(int, ip6_use_tempaddr);	/* Whether to use temporary addresses */
  VNET_DECLARE(int, ip6_prefer_tempaddr);	/* Whether to prefer temporary
  					 * addresses in the source address
  					 * selection */
  #define	V_ip6_use_tempaddr		VNET(ip6_use_tempaddr)
  #define	V_ip6_prefer_tempaddr		VNET(ip6_prefer_tempaddr)
  
  VNET_DECLARE(int, ip6_use_defzone);	/* Whether to use the default scope
  					 * zone when unspecified */
  #define	V_ip6_use_defzone		VNET(ip6_use_defzone)
  
  VNET_DECLARE (struct pfil_head, inet6_pfil_hook);	/* packet filter hooks */
  #define	V_inet6_pfil_hook	VNET(inet6_pfil_hook)
  #ifdef IPSTEALTH
  VNET_DECLARE(int, ip6stealth);
  #define	V_ip6stealth			VNET(ip6stealth)
  #endif
  
  extern struct	pr_usrreqs rip6_usrreqs;
  struct sockopt;
  
  struct inpcb;
  
  int	icmp6_ctloutput(struct socket *, struct sockopt *sopt);
  
  struct in6_ifaddr;
  void	ip6_init(void);
  #ifdef VIMAGE
  void	ip6_destroy(void);
  #endif
  int	ip6proto_register(short);
  int	ip6proto_unregister(short);
  
  void	ip6_input(struct mbuf *);
  struct in6_ifaddr *ip6_getdstifaddr(struct mbuf *);
  void	ip6_freepcbopts(struct ip6_pktopts *);
  
  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 *);
  
  #ifdef __notyet__
  struct ip6aux *ip6_findaux(struct mbuf *);
  #endif
  
  extern 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 *);
  struct mbuf	**ip6_savecontrol_v4(struct inpcb *, struct mbuf *,
  	    struct mbuf **, int *);
  void	ip6_savecontrol(struct inpcb *, struct mbuf *, 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 *);
  int	ip6_ctloutput(struct socket *, struct sockopt *);
  int	ip6_raw_ctloutput(struct socket *, struct sockopt *);
  void	ip6_initpktopts(struct ip6_pktopts *);
  int	ip6_setpktopts(struct mbuf *, struct ip6_pktopts *,
  	struct ip6_pktopts *, struct ucred *, 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 **, int *, int);
  void	rip6_ctlinput(int, struct sockaddr *, void *);
  int	rip6_ctloutput(struct socket *, struct sockopt *);
  int	rip6_output(struct mbuf *, ...);
  int	rip6_usrreq(struct socket *,
  	    int, struct mbuf *, struct mbuf *, struct mbuf *, struct thread *);
  
  int	dest6_input(struct mbuf **, int *, int);
  int	none_input(struct mbuf **, int *, int);
  
  int	in6_selectsrc(struct sockaddr_in6 *, struct ip6_pktopts *,
  	struct inpcb *inp, struct route_in6 *, struct ucred *cred,
  	struct ifnet **, struct in6_addr *);
  int in6_selectroute(struct sockaddr_in6 *, struct ip6_pktopts *,
  	struct ip6_moptions *, struct route_in6 *, struct ifnet **,
  	struct rtentry **);
  int	in6_selectroute_fib(struct sockaddr_in6 *, struct ip6_pktopts *,
  	    struct ip6_moptions *, struct route_in6 *, struct ifnet **,
  	    struct rtentry **, u_int);
  u_int32_t ip6_randomid(void);
  u_int32_t ip6_randomflowlabel(void);
  #endif /* _KERNEL */
  
  #endif /* !_NETINET6_IP6_VAR_H_ */
  