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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

 * $FreeBSD: src/sys/netinet/in_var.h,v 1.45 2002/03/24 10:19:10 bde Exp $

 */

#ifndef _NETINET_IN_VAR_H_

#define _NETINET_IN_VAR_H_

#include <sys/queue.h>

#include <sys/fnv_hash.h>

/*

 * Interface address, Internet version.  One of these structures

 * is allocated for each Internet address on an interface.

 * 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 */

        LIST_ENTRY(in_ifaddr) ia_hash;  /* entry in bucket of inet addresses */

        TAILQ_ENTRY(in_ifaddr) ia_link; /* 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 */

};

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  ifqueue ipintrq;                /* ip packet input queue */

extern  struct  in_addr zeroin_addr;

extern  u_char  inetctlerrmap[];

/*

 * Hash table for IP addresses.

 */

extern  LIST_HEAD(in_ifaddrhashhead, in_ifaddr) *in_ifaddrhashtbl;

extern  TAILQ_HEAD(in_ifaddrhead, in_ifaddr) in_ifaddrhead;

extern  u_long in_ifaddrhmask;                  /* mask for hash table */

#define INADDR_NHASH_LOG2       9

#define INADDR_NHASH            (1 << INADDR_NHASH_LOG2)

#define INADDR_HASHVAL(x)       fnv_32_buf((&(x)), sizeof(x), FNV1_32_INIT)

#define INADDR_HASH(x) \

        (&in_ifaddrhashtbl[INADDR_HASHVAL(x) & in_ifaddrhmask])

/*

 * 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; */ \

{ \

        struct in_ifaddr *ia; \

\

        LIST_FOREACH(ia, INADDR_HASH((addr).s_addr), ia_hash) \

                if (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) = TAILQ_FIRST(&in_ifaddrhead); \

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

            (ia) = TAILQ_NEXT((ia), ia_link)) \

                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.

 * For every entry on the interface's if_multiaddrs list which represents

 * an IP multicast group, there is one of these structures.  They are also

 * kept on a system-wide list to make it easier to keep our legacy IGMP code

 * compatible with the rest of the world (see IN_FIRST_MULTI et al, below).

 */

struct in_multi {

        LIST_ENTRY(in_multi) inm_link;  /* queue macro glue */

        struct  in_addr inm_addr;       /* IP multicast address, convenience */

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

        struct  ifmultiaddr *inm_ifma;  /* back pointer to ifmultiaddr */

        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

#ifdef SYSCTL_DECL

SYSCTL_DECL(_net_inet_ip);

SYSCTL_DECL(_net_inet_raw);

#endif

extern LIST_HEAD(in_multihead, in_multi) in_multihead;

/*

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

 * all of the in_multi records.

 */

struct in_multistep {

        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" is set null.

 */

#define IN_LOOKUP_MULTI(addr, ifp, inm) \

        /* struct in_addr addr; */ \

        /* struct ifnet *ifp; */ \

        /* struct in_multi *inm; */ \

do { \

        struct ifmultiaddr *ifma; \

\

        TAILQ_FOREACH(ifma, &((ifp)->if_multiaddrs), ifma_link) { \

                if (ifma->ifma_addr->sa_family == AF_INET \

                    && ((struct sockaddr_in *)ifma->ifma_addr)->sin_addr.s_addr == \

                    (addr).s_addr) \

                        break; \

        } \

        (inm) = ifma ? ifma->ifma_protospec : 0; \

} while(0)

/*

 * 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; */ \

do { \

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

                (step).i_inm = LIST_NEXT((step).i_inm, inm_link); \

} while(0)

#define IN_FIRST_MULTI(step, inm) \

        /* struct in_multistep step; */ \

        /* struct in_multi *inm; */ \

do { \

        (step).i_inm = LIST_FIRST(&in_multihead); \

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

} while(0)

struct  route;

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

void    in_delmulti(struct in_multi *);

int     in_control(struct socket *, u_long, caddr_t, struct ifnet *,

            struct thread *);

void    in_rtqdrain(void);

void    ip_input(struct mbuf *);

int     in_ifadown(struct ifaddr *ifa, int);

void    in_ifscrub(struct ifnet *, struct in_ifaddr *);

int     ipflow_fastforward(struct mbuf *);

void    ipflow_create(const struct route *, struct mbuf *);

void    ipflow_slowtimo(void);

#endif /* _KERNEL */

/* INET6 stuff */

#include <netinet6/in6_var.h>

#endif /* _NETINET_IN_VAR_H_ */