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/*

 * 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    8.2 (Berkeley) 1/9/95

 *      $Id: ip_var.h,v 1.2 2001-09-27 12:01:56 chris Exp $

 */

#ifndef _NETINET_IP_VAR_H_

#define _NETINET_IP_VAR_H_

/*

 * Overlay for ip header used by other protocols (tcp, udp).

 */

struct ipovly {

        caddr_t ih_next, ih_prev;       /* for protocol sequence q's */

        u_char  ih_x1;                  /* (unused) */

        u_char  ih_pr;                  /* protocol */

        u_short ih_len;                 /* protocol length */

        struct  in_addr ih_src;         /* source internet address */

        struct  in_addr ih_dst;         /* destination internet address */

};

/*

 * Ip reassembly queue structure.  Each fragment

 * being reassembled is attached to one of these structures.

 * They are timed out after ipq_ttl drops to 0, and may also

 * be reclaimed if memory becomes tight.

 */

struct ipq {

        struct  ipq *next,*prev;        /* to other reass headers */

        u_char  ipq_ttl;                /* time for reass q to live */

        u_char  ipq_p;                  /* protocol of this fragment */

        u_short ipq_id;                 /* sequence id for reassembly */

        struct  ipasfrag *ipq_next,*ipq_prev;

                                        /* to ip headers of fragments */

        struct  in_addr ipq_src,ipq_dst;

#ifdef IPDIVERT

        u_short ipq_divert;             /* divert protocol port */

#endif

};

/*

 * Ip header, when holding a fragment.

 *

 * Note: ipf_next must be at same offset as ipq_next above

 */

struct  ipasfrag {

#if BYTE_ORDER == LITTLE_ENDIAN 

        u_char  ip_hl:4,

                ip_v:4;

#endif

#if BYTE_ORDER == BIG_ENDIAN 

        u_char  ip_v:4,

                ip_hl:4;

#endif

        u_char  ipf_mff;                /* XXX overlays ip_tos: use low bit

                                         * to avoid destroying tos;

                                         * copied from (ip_off&IP_MF) */

        u_short ip_len;

        u_short ip_id;

        u_short ip_off;

        u_char  ip_ttl;

        u_char  ip_p;

        u_short ip_sum;

        struct  ipasfrag *ipf_next;     /* next fragment */

        struct  ipasfrag *ipf_prev;     /* previous fragment */

};

/*

 * Structure stored in mbuf in inpcb.ip_options

 * and passed to ip_output when ip options are in use.

 * The actual length of the options (including ipopt_dst)

 * is in m_len.

 */

#define MAX_IPOPTLEN    40

struct ipoption {

        struct  in_addr ipopt_dst;      /* first-hop dst if source routed */

        char    ipopt_list[MAX_IPOPTLEN];       /* options proper */

};

/*

 * Structure attached to inpcb.ip_moptions and

 * passed to ip_output when IP multicast options are in use.

 */

struct ip_moptions {

        struct  ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */

        u_char  imo_multicast_ttl;      /* TTL for outgoing multicasts */

        u_char  imo_multicast_loop;     /* 1 => hear sends if a member */

        u_short imo_num_memberships;    /* no. memberships this socket */

        struct  in_multi *imo_membership[IP_MAX_MEMBERSHIPS];

        u_long  imo_multicast_vif;      /* vif num outgoing multicasts */

};

struct  ipstat {

        u_long  ips_total;              /* total packets received */

        u_long  ips_badsum;             /* checksum bad */

        u_long  ips_tooshort;           /* packet too short */

        u_long  ips_toosmall;           /* not enough data */

        u_long  ips_badhlen;            /* ip header length < data size */

        u_long  ips_badlen;             /* ip length < ip header length */

        u_long  ips_fragments;          /* fragments received */

        u_long  ips_fragdropped;        /* frags dropped (dups, out of space) */

        u_long  ips_fragtimeout;        /* fragments timed out */

        u_long  ips_forward;            /* packets forwarded */

        u_long  ips_cantforward;        /* packets rcvd for unreachable dest */

        u_long  ips_redirectsent;       /* packets forwarded on same net */

        u_long  ips_noproto;            /* unknown or unsupported protocol */

        u_long  ips_delivered;          /* datagrams delivered to upper level*/

        u_long  ips_localout;           /* total ip packets generated here */

        u_long  ips_odropped;           /* lost packets due to nobufs, etc. */

        u_long  ips_reassembled;        /* total packets reassembled ok */

        u_long  ips_fragmented;         /* datagrams successfully fragmented */

        u_long  ips_ofragments;         /* output fragments created */

        u_long  ips_cantfrag;           /* don't fragment flag was set, etc. */

        u_long  ips_badoptions;         /* error in option processing */

        u_long  ips_noroute;            /* packets discarded due to no route */

        u_long  ips_badvers;            /* ip version != 4 */

        u_long  ips_rawout;             /* total raw ip packets generated */

        u_long  ips_toolong;            /* ip length > max ip packet size */

};

#ifdef KERNEL

/* flags passed to ip_output as last parameter */

#define IP_FORWARDING           0x1             /* most of ip header exists */

#define IP_RAWOUTPUT            0x2             /* raw ip header exists */

#define IP_ROUTETOIF            SO_DONTROUTE    /* bypass routing tables */

#define IP_ALLOWBROADCAST       SO_BROADCAST    /* can send broadcast packets */

struct inpcb;

struct route;

extern struct   ipstat  ipstat;

extern u_short  ip_id;                          /* ip packet ctr, for ids */

extern int      ip_defttl;                      /* default IP ttl */

extern u_char   ip_protox[];

extern struct socket *ip_rsvpd; /* reservation protocol daemon */

extern struct socket *ip_mrouter; /* multicast routing daemon */

extern int      (*legal_vif_num) __P((int));

extern u_long   (*ip_mcast_src) __P((int));

extern int rsvp_on;

int      ip_ctloutput __P((int, struct socket *, int, int, struct mbuf **));

void     ip_drain __P((void));

void     ip_freemoptions __P((struct ip_moptions *));

void     ip_init __P((void));

extern int       (*ip_mforward) __P((struct ip *, struct ifnet *, struct mbuf *,

                          struct ip_moptions *));

int      ip_output __P((struct mbuf *,

            struct mbuf *, struct route *, int, struct ip_moptions *));

void     ip_savecontrol __P((struct inpcb *, struct mbuf **, struct ip *,

                struct mbuf *));

void     ip_slowtimo __P((void));

struct mbuf *

         ip_srcroute __P((void));

void     ip_stripoptions __P((struct mbuf *, struct mbuf *));

int      rip_ctloutput __P((int, struct socket *, int, int, struct mbuf **));

void     rip_init __P((void));

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

int      rip_output __P((struct mbuf *, struct socket *, u_long));

int      rip_usrreq __P((struct socket *,

            int, struct mbuf *, struct mbuf *, struct mbuf *));

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

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

int     ip_rsvp_init __P((struct socket *));

int     ip_rsvp_done __P((void));

int     ip_rsvp_vif_init __P((struct socket *, struct mbuf *));

int     ip_rsvp_vif_done __P((struct socket *, struct mbuf *));

void    ip_rsvp_force_done __P((struct socket *));

#ifdef IPDIVERT

void    div_init __P((void));

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

int     div_usrreq __P((struct socket *,

                int, struct mbuf *, struct mbuf *, struct mbuf *));

extern u_short ip_divert_port;

extern u_short ip_divert_ignore;

#endif /* IPDIVERT */

#endif /* KERNEL */

#endif /* _NETINET_IP_VAR_H_ */