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/*

 * Copyright (c) 1985, 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.

 *

 *      @(#)in_var.h    8.2 (Berkeley) 1/9/95

 *      $Id: in_var.h,v 1.2 2001-09-27 12:01:55 chris Exp $

 */

#ifndef _NETINET_IN_VAR_H_

#define _NETINET_IN_VAR_H_

#include <sys/queue.h>

/*

 * Interface address, Internet version.  One of these structures

 * is allocated for each interface with an Internet address.

 * The ifaddr structure contains the protocol-independent part

 * of the structure and is assumed to be first.

 */

struct in_ifaddr {

        struct  ifaddr ia_ifa;          /* protocol-independent info */

#define ia_ifp          ia_ifa.ifa_ifp

#define ia_flags        ia_ifa.ifa_flags

                                        /* ia_{,sub}net{,mask} in host order */

        u_long  ia_net;                 /* network number of interface */

        u_long  ia_netmask;             /* mask of net part */

        u_long  ia_subnet;              /* subnet number, including net */

        u_long  ia_subnetmask;          /* mask of subnet part */

        struct  in_addr ia_netbroadcast; /* to recognize net broadcasts */

        struct  in_ifaddr *ia_next;     /* next in list of internet addresses */

        struct  sockaddr_in ia_addr;    /* reserve space for interface name */

        struct  sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */

#define ia_broadaddr    ia_dstaddr

        struct  sockaddr_in ia_sockmask; /* reserve space for general netmask */

        LIST_HEAD(in_multihead, in_multi) ia_multiaddrs;

                                        /* list of multicast addresses */

};

struct  in_aliasreq {

        char    ifra_name[IFNAMSIZ];            /* if name, e.g. "en0" */

        struct  sockaddr_in ifra_addr;

        struct  sockaddr_in ifra_broadaddr;

#define ifra_dstaddr ifra_broadaddr

        struct  sockaddr_in ifra_mask;

};

/*

 * Given a pointer to an in_ifaddr (ifaddr),

 * return a pointer to the addr as a sockaddr_in.

 */

#define IA_SIN(ia)    (&(((struct in_ifaddr *)(ia))->ia_addr))

#define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr))

#define IN_LNAOF(in, ifa) \

        ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask))

#ifdef  KERNEL

extern  struct  in_ifaddr *in_ifaddr;

extern  struct  ifqueue ipintrq;                /* ip packet input queue */

extern  struct  in_addr zeroin_addr;

extern  u_char  inetctlerrmap[];

extern  int rtq_reallyold;      /* XXX */

extern  int rtq_minreallyold;   /* XXX */

extern  int rtq_toomany;        /* XXX */

/*

 * Macro for finding the interface (ifnet structure) corresponding to one

 * of our IP addresses.

 */

#define INADDR_TO_IFP(addr, ifp) \

        /* struct in_addr addr; */ \

        /* struct ifnet *ifp; */ \

{ \

        register struct in_ifaddr *ia; \

\

        for (ia = in_ifaddr; \

            ia != NULL && ((ia->ia_ifp->if_flags & IFF_POINTOPOINT)? \

                IA_DSTSIN(ia):IA_SIN(ia))->sin_addr.s_addr != (addr).s_addr; \

            ia = ia->ia_next) \

                 continue; \

        if (ia == NULL) \

            for (ia = in_ifaddr; \

                ia != NULL; \

                ia = ia->ia_next) \

                    if (ia->ia_ifp->if_flags & IFF_POINTOPOINT && \

                        IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) \

                            break; \

        (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \

}

/*

 * Macro for finding the internet address structure (in_ifaddr) corresponding

 * to a given interface (ifnet structure).

 */

#define IFP_TO_IA(ifp, ia) \

        /* struct ifnet *ifp; */ \

        /* struct in_ifaddr *ia; */ \

{ \

        for ((ia) = in_ifaddr; \

            (ia) != NULL && (ia)->ia_ifp != (ifp); \

            (ia) = (ia)->ia_next) \

                continue; \

}

#endif

/*

 * This information should be part of the ifnet structure but we don't wish

 * to change that - as it might break a number of things

 */

struct router_info {

        struct ifnet *rti_ifp;

        int    rti_type; /* type of router which is querier on this interface */

        int    rti_time; /* # of slow timeouts since last old query */

        struct router_info *rti_next;

};

/*

 * Internet multicast address structure.  There is one of these for each IP

 * multicast group to which this host belongs on a given network interface.

 * They are kept in a linked list, rooted in the interface's in_ifaddr

 * structure.

 */

struct in_multi {

        LIST_ENTRY(in_multi) inm_entry; /* list glue */

        struct  in_addr inm_addr;       /* IP multicast address */

        struct  ifnet *inm_ifp;         /* back pointer to ifnet */

        struct  in_ifaddr *inm_ia;      /* back pointer to in_ifaddr */

        u_int   inm_refcount;           /* no. membership claims by sockets */

        u_int   inm_timer;              /* IGMP membership report timer */

        u_int   inm_state;              /*  state of the membership */

        struct  router_info *inm_rti;   /* router info*/

};

#ifdef KERNEL

/*

 * Structure used by macros below to remember position when stepping through

 * all of the in_multi records.

 */

struct in_multistep {

        struct in_ifaddr *i_ia;

        struct in_multi *i_inm;

};

/*

 * Macro for looking up the in_multi record for a given IP multicast address

 * on a given interface.  If no matching record is found, "inm" returns NULL.

 */

#define IN_LOOKUP_MULTI(addr, ifp, inm) \

        /* struct in_addr addr; */ \

        /* struct ifnet *ifp; */ \

        /* struct in_multi *inm; */ \

{ \

        register struct in_ifaddr *ia; \

\

        IFP_TO_IA((ifp), ia); \

        if (ia == NULL) \

                (inm) = NULL; \

        else \

                for ((inm) = ia->ia_multiaddrs.lh_first; \

                    (inm) != NULL && (inm)->inm_addr.s_addr != (addr).s_addr; \

                     (inm) = inm->inm_entry.le_next) \

                         continue; \

}

/*

 * Macro to step through all of the in_multi records, one at a time.

 * The current position is remembered in "step", which the caller must

 * provide.  IN_FIRST_MULTI(), below, must be called to initialize "step"

 * and get the first record.  Both macros return a NULL "inm" when there

 * are no remaining records.

 */

#define IN_NEXT_MULTI(step, inm) \

        /* struct in_multistep  step; */ \

        /* struct in_multi *inm; */ \

{ \

        if (((inm) = (step).i_inm) != NULL) \

                (step).i_inm = (inm)->inm_entry.le_next; \

        else \

                while ((step).i_ia != NULL) { \

                        (inm) = (step).i_ia->ia_multiaddrs.lh_first; \

                        (step).i_ia = (step).i_ia->ia_next; \

                        if ((inm) != NULL) { \

                                (step).i_inm = (inm)->inm_entry.le_next; \

                                break; \

                        } \

                } \

}

#define IN_FIRST_MULTI(step, inm) \

        /* struct in_multistep step; */ \

        /* struct in_multi *inm; */ \

{ \

        (step).i_ia = in_ifaddr; \

        (step).i_inm = NULL; \

        IN_NEXT_MULTI((step), (inm)); \

}

struct  in_multi *in_addmulti __P((struct in_addr *, struct ifnet *));

void    in_delmulti __P((struct in_multi *));

int     in_control __P((struct socket *, u_long, caddr_t, struct ifnet *));

void    in_rtqdrain __P((void));

void    ip_input __P((struct mbuf *));

#endif /* KERNEL */

#endif /* _NETINET_IN_VAR_H_ */