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/*!\file netinet6/ip6_var.h
 *
 */

/*      $FreeBSD: src/sys/netinet6/ip6_var.h,v 1.9 2002/07/25 17:40:45 ume 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_

#include <sys/queue.h>

#if !defined(__BORLANDC__) /* stop warnings for undefined structs */
/*
 * 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(dummy, in6_multi_mship) im6o_memberships;
};
#endif   /* __BORLANDC__ */

#ifndef _NETINET6_IN6_H_
struct  route_in6 {
        struct  rtentry *ro_rt;
        struct  sockaddr_in6 ro_dst;
};
#endif


/*
 * Control options for outgoing packets
 */

/* Routing header related info */
#if !defined(__BORLANDC__)
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;
};
#endif   /* __BORLANDC__ */

/*
 * 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.    */
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_ */