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//==========================================================================

//

//      include/netinet/ip_var.h

//

//      

//

//==========================================================================

//####BSDCOPYRIGHTBEGIN####

//

// -------------------------------------------

//

// Portions of this software may have been derived from OpenBSD or other sources,

// and are covered by the appropriate copyright disclaimers included herein.

//

// -------------------------------------------

//

//####BSDCOPYRIGHTEND####

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    gthomas

// Contributors: gthomas

// Date:         2000-01-10

// Purpose:      

// Description:  

//              

//

//####DESCRIPTIONEND####

//

//==========================================================================

/*      $OpenBSD: ip_var.h,v 1.12 1999/12/08 06:50:20 itojun Exp $      */

/*      $NetBSD: ip_var.h,v 1.16 1996/02/13 23:43:20 christos 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.

 * 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 _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_int8_t  ih_x1[9];             /* (unused) */

        u_int8_t  ih_pr;                /* protocol */

        u_int16_t ih_len;               /* protocol length */

        struct    in_addr ih_src;       /* source internet address */

        struct    in_addr ih_dst;       /* destination internet address */

};

/*

 * Ip (reassembly or sequence) queue structures.

 *

 * XXX -- The following explains why the ipqe_m field is here, for TCP's use:

 * We want to avoid doing m_pullup on incoming packets but that

 * means avoiding dtom on the tcp reassembly code.  That in turn means

 * keeping an mbuf pointer in the reassembly queue (since we might

 * have a cluster).  As a quick hack, the source & destination

 * port numbers (which are no longer needed once we've located the

 * tcpcb) are overlayed with an mbuf pointer.

 */

LIST_HEAD(ipqehead, ipqent);

struct ipqent {

        LIST_ENTRY(ipqent) ipqe_q;

        union {

                struct ip       *_ip;

                struct tcphdr   *_tcp;

        } _ipqe_u1;

        union {

                u_int8_t        _mff;   /* for IP fragmentation */

                struct mbuf     *_m;    /* XXX for TCP; see above */

        } _ipqe_u2;

};

#define ipqe_ip         _ipqe_u1._ip

#define ipqe_tcp        _ipqe_u1._tcp

#define ipqe_mff        _ipqe_u2._mff

#define ipqe_m          _ipqe_u2._m

/*

 * 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 {

        LIST_ENTRY(ipq) ipq_q;          /* to other reass headers */

        u_int8_t  ipq_ttl;              /* time for reass q to live */

        u_int8_t  ipq_p;                /* protocol of this fragment */

        u_int16_t ipq_id;               /* sequence id for reassembly */

        struct    ipqehead ipq_fragq;   /* to ip fragment queue */

        struct    in_addr ipq_src, ipq_dst;

};

/*

 * 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 */

        int8_t  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_int8_t  imo_multicast_ttl;    /* TTL for outgoing multicasts */

        u_int8_t  imo_multicast_loop;   /* 1 => hear sends if a member */

        u_int16_t imo_num_memberships;  /* no. memberships this socket */

        struct    in_multi *imo_membership[IP_MAX_MEMBERSHIPS];

};

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 sucessfully 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_badfrags;           /* malformed fragments (bad length) */

        u_long  ips_rcvmemdrop;         /* frags dropped for lack of memory */

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

        u_long  ips_nogif;              /* no match gif found */

};

#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 */

#ifdef IPSEC

#define IP_ENCAPSULATED         0x0800          /* encapsulated already */

#endif

extern struct     ipstat ipstat;

#ifndef RANDOM_IP_ID

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

#endif

LIST_HEAD(ipqhead, ipq) ipq;            /* ip reass. queue */

extern int ip_defttl;                   /* default IP ttl */

extern int ipforwarding;                /* IPforwarding state */

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

int      ip_dooptions __P((struct mbuf *));

void     ip_drain __P((void));

void     ip_flush __P((void));

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

void     ip_freef __P((struct ipq *));

void     ip_freemoptions __P((struct ip_moptions *));

int      ip_getmoptions __P((int, struct ip_moptions *, struct mbuf **));

void     ip_init __P((void));

int      ip_mforward __P((struct mbuf *, struct ifnet *));

int      ip_optcopy __P((struct ip *, struct ip *));

int      ip_output __P((struct mbuf *, ...));

int      ip_pcbopts __P((struct mbuf **, struct mbuf *));

struct ip *

         ip_reass __P((struct ipqent *, struct ipq *));

struct in_ifaddr *

         in_iawithaddr __P((struct in_addr, struct mbuf *));

struct in_ifaddr *

         ip_rtaddr __P((struct in_addr));

u_int16_t

         ip_randomid __P((void));

int      ip_setmoptions __P((int, struct ip_moptions **, struct mbuf *));

void     ip_slowtimo __P((void));

struct mbuf *

         ip_srcroute __P((void));

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

int      ip_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));

void     ipintr __P((void));

void     ipv4_input __P((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      rip_output __P((struct mbuf *, ...));

int      rip_usrreq __P((struct socket *,

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

#endif

#endif // _NETINET_IP_VAR_H_