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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

 * $FreeBSD: src/sys/netinet/ip_var.h,v 1.60 2002/03/19 21:25:46 alfred Exp $

 */

#ifndef _NETINET_IP_VAR_H_

#define _NETINET_IP_VAR_H_

#include <sys/queue.h>

/*

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

 */

struct ipovly {

        u_char  ih_x1[9];               /* (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 {

        TAILQ_ENTRY(ipq) ipq_list;      /* 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 mbuf *ipq_frags;         /* to ip headers of fragments */

        struct  in_addr ipq_src,ipq_dst;

#ifdef IPDIVERT

        u_int32_t ipq_div_info;         /* ipfw divert port & flags */

        u_int16_t ipq_div_cookie;       /* ipfw divert cookie */

#endif

};

/*

 * 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 */

        struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */

        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_fastforward;        /* packets fast 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 */

        u_long  ips_notmember;          /* multicasts for unregistered grps */

        u_long  ips_nogif;              /* no match gif found */

        u_long  ips_badaddr;            /* invalid address on header */

};

#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 ip;

struct inpcb;

struct route;

struct sockopt;

extern struct   ipstat  ipstat;

#ifndef RANDOM_IP_ID

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

#endif

extern int      ip_defttl;                      /* default IP ttl */

extern int      ipforwarding;                   /* ip forwarding */

extern struct route ipforward_rt;               /* ip forwarding cached route */

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)(int);

extern u_long   (*ip_mcast_src)(int);

extern int rsvp_on;

extern struct   pr_usrreqs rip_usrreqs;

int      ip_ctloutput(struct socket *, struct sockopt *sopt);

void     ip_drain(void);

void     ip_freemoptions(struct ip_moptions *);

void     ip_init(void);

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

                          struct ip_moptions *);

int      ip_output(struct mbuf *,

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

struct in_ifaddr *

         ip_rtaddr(struct in_addr, struct route *);

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

                struct mbuf *);

void     ip_slowtimo(void);

struct mbuf *

         ip_srcroute(void);

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

#ifdef RANDOM_IP_ID

u_int16_t

         ip_randomid(void);

#endif

int      rip_ctloutput(struct socket *, struct sockopt *);

void     rip_ctlinput(int, struct sockaddr *, void *);

void     rip_init(void);

void     rip_input(struct mbuf *, int);

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

void    ipip_input(struct mbuf *, int);

void    rsvp_input(struct mbuf *, int);

int     ip_rsvp_init(struct socket *);

int     ip_rsvp_done(void);

int     ip_rsvp_vif_init(struct socket *, struct sockopt *);

int     ip_rsvp_vif_done(struct socket *, struct sockopt *);

void    ip_rsvp_force_done(struct socket *);

#ifdef IPDIVERT

void    div_init(void);

void    div_input(struct mbuf *, int);

void    divert_packet(struct mbuf *, int, int);

extern struct pr_usrreqs div_usrreqs;

extern u_int16_t ip_divert_cookie;

#endif

extern struct sockaddr_in *ip_fw_fwd_addr;

void    in_delayed_cksum(struct mbuf *m);

#endif /* _KERNEL */

#endif /* !_NETINET_IP_VAR_H_ */