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

//

//      include/net/if_var.h

//

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

//####BSDCOPYRIGHTBEGIN####

//

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

//

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

// FreeBSD or other sources, and are covered by the appropriate

// copyright disclaimers included herein.

//

// Portions created by Red Hat are

// Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.

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

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//####BSDCOPYRIGHTEND####

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

/*

 * Copyright (c) 1982, 1986, 1989, 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.

 *

 *      From: @(#)if.h  8.1 (Berkeley) 6/10/93

 * $FreeBSD: src/sys/net/if_var.h,v 1.18.2.7 2001/07/24 19:10:18 brooks Exp $

 */

#ifndef _NET_IF_VAR_H_

#define _NET_IF_VAR_H_

/*

 * Structures defining a network interface, providing a packet

 * transport mechanism (ala level 0 of the PUP protocols).

 *

 * Each interface accepts output datagrams of a specified maximum

 * length, and provides higher level routines with input datagrams

 * received from its medium.

 *

 * Output occurs when the routine if_output is called, with three parameters:

 *      (*ifp->if_output)(ifp, m, dst, rt)

 * Here m is the mbuf chain to be sent and dst is the destination address.

 * The output routine encapsulates the supplied datagram if necessary,

 * and then transmits it on its medium.

 *

 * On input, each interface unwraps the data received by it, and either

 * places it on the input queue of a internetwork datagram routine

 * and posts the associated software interrupt, or passes the datagram to a raw

 * packet input routine.

 *

 * Routines exist for locating interfaces by their addresses

 * or for locating a interface on a certain network, as well as more general

 * routing and gateway routines maintaining information used to locate

 * interfaces.  These routines live in the files if.c and route.c

 */

#ifdef __STDC__

/*

 * Forward structure declarations for function prototypes [sic].

 */

struct  mbuf;

struct  proc;

struct  rtentry;

struct  socket;

struct  ether_header;

#endif

#include <sys/queue.h>          /* get TAILQ macros */

TAILQ_HEAD(ifnethead, ifnet);   /* we use TAILQs so that the order of */

TAILQ_HEAD(ifaddrhead, ifaddr); /* instantiation is preserved in the list */

TAILQ_HEAD(ifprefixhead, ifprefix);

LIST_HEAD(ifmultihead, ifmultiaddr);

/*

 * Structure defining a queue for a network interface.

 */

struct  ifqueue {

        struct  mbuf *ifq_head;

        struct  mbuf *ifq_tail;

        int     ifq_len;

        int     ifq_maxlen;

        int     ifq_drops;

};

/*

 * Structure defining a network interface.

 *

 * (Would like to call this struct ``if'', but C isn't PL/1.)

 */

struct ifnet {

        void    *if_softc;              /* pointer to driver state */

        char    *if_name;               /* name, e.g. ``en'' or ``lo'' */

        TAILQ_ENTRY(ifnet) if_link;     /* all struct ifnets are chained */

        struct  ifaddrhead if_addrhead; /* linked list of addresses per if */

        char    if_xname[IFNAMSIZ];     /* external name (name + unit) */

        int     if_pcount;              /* number of promiscuous listeners */

        struct  bpf_if *if_bpf;         /* packet filter structure */

        u_short if_index;               /* numeric abbreviation for this if  */

        short   if_unit;                /* sub-unit for lower level driver */

        short   if_timer;               /* time 'til if_watchdog called */

        short   if_flags;               /* up/down, broadcast, etc. */

        int     if_ipending;            /* interrupts pending */

        void    *if_linkmib;            /* link-type-specific MIB data */

        size_t  if_linkmiblen;          /* length of above data */

        struct  if_data if_data;

        struct  ifmultihead if_multiaddrs; /* multicast addresses configured */

        int     if_amcount;             /* number of all-multicast requests */

/* procedure handles */

        int     (*if_output)            /* output routine (enqueue) */

                __P((struct ifnet *, struct mbuf *, struct sockaddr *,

                     struct rtentry *));

        void    (*if_start)             /* initiate output routine */

                __P((struct ifnet *));

        int     (*if_done)              /* output complete routine */

                __P((struct ifnet *));  /* (XXX not used; fake prototype) */

        int     (*if_ioctl)             /* ioctl routine */

                __P((struct ifnet *, u_long, caddr_t));

        void    (*if_watchdog)          /* timer routine */

                __P((struct ifnet *));

        int     (*if_poll_recv)         /* polled receive routine */

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

        int     (*if_poll_xmit)         /* polled transmit routine */

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

        void    (*if_poll_intren)       /* polled interrupt reenable routine */

                __P((struct ifnet *));

        void    (*if_poll_slowinput)    /* input routine for slow devices */

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

        void    (*if_init)              /* Init routine */

                __P((void *));

        int     (*if_resolvemulti)      /* validate/resolve multicast */

                __P((struct ifnet *, struct sockaddr **, struct sockaddr *));

        struct  ifqueue if_snd;         /* output queue */

        struct  ifqueue *if_poll_slowq; /* input queue for slow devices */

        struct  ifprefixhead if_prefixhead; /* list of prefixes per if */

};

typedef void if_init_f_t __P((void *));

#define if_mtu          if_data.ifi_mtu

#define if_type         if_data.ifi_type

#define if_physical     if_data.ifi_physical

#define if_addrlen      if_data.ifi_addrlen

#define if_hdrlen       if_data.ifi_hdrlen

#define if_metric       if_data.ifi_metric

#define if_baudrate     if_data.ifi_baudrate

#define if_hwassist     if_data.ifi_hwassist

#define if_ipackets     if_data.ifi_ipackets

#define if_ierrors      if_data.ifi_ierrors

#define if_opackets     if_data.ifi_opackets

#define if_oerrors      if_data.ifi_oerrors

#define if_collisions   if_data.ifi_collisions

#define if_ibytes       if_data.ifi_ibytes

#define if_obytes       if_data.ifi_obytes

#define if_imcasts      if_data.ifi_imcasts

#define if_omcasts      if_data.ifi_omcasts

#define if_iqdrops      if_data.ifi_iqdrops

#define if_noproto      if_data.ifi_noproto

#define if_lastchange   if_data.ifi_lastchange

#define if_recvquota    if_data.ifi_recvquota

#define if_xmitquota    if_data.ifi_xmitquota

#define if_rawoutput(if, m, sa) if_output(if, m, sa, (struct rtentry *)0)

/* for compatibility with other BSDs */

#define if_addrlist     if_addrhead

#define if_list         if_link

static __inline__ char *

if_name(struct ifnet *ifp)

{

    return ifp->if_xname;

}

/*

 * Bit values in if_ipending

 */

#define IFI_RECV        1       /* I want to receive */

#define IFI_XMIT        2       /* I want to transmit */

/*

 * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq)

 * are queues of messages stored on ifqueue structures

 * (defined above).  Entries are added to and deleted from these structures

 * by these macros, which should be called with ipl raised to splimp().

 */

#define IF_QFULL(ifq)           ((ifq)->ifq_len >= (ifq)->ifq_maxlen)

#define IF_DROP(ifq)            ((ifq)->ifq_drops++)

#define IF_ENQUEUE(ifq, m) { \

        (m)->m_nextpkt = 0; \

        if ((ifq)->ifq_tail == 0) \

                (ifq)->ifq_head = m; \

        else \

                (ifq)->ifq_tail->m_nextpkt = m; \

        (ifq)->ifq_tail = m; \

        (ifq)->ifq_len++; \

}

#define IF_PREPEND(ifq, m) { \

        (m)->m_nextpkt = (ifq)->ifq_head; \

        if ((ifq)->ifq_tail == 0) \

                (ifq)->ifq_tail = (m); \

        (ifq)->ifq_head = (m); \

        (ifq)->ifq_len++; \

}

#define IF_DEQUEUE(ifq, m) { \

        (m) = (ifq)->ifq_head; \

        if (m) { \

                if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) \

                        (ifq)->ifq_tail = 0; \

                (m)->m_nextpkt = 0; \

                (ifq)->ifq_len--; \

        } \

}

#define IF_POLL(ifq, m)         ((m) = (ifq)->ifq_head)

#define IF_PURGE(ifq)                                                   \

while (1) {                                                             \

        struct mbuf *m0;                                                \

        IF_DEQUEUE((ifq), m0);                                          \

        if (m0 == NULL)                                                 \

                break;                                                  \

        else                                                            \

                m_freem(m0);                                            \

}

#define IF_IS_EMPTY(ifq)        ((ifq)->ifq_len == 0)

#ifdef _KERNEL

#define IF_ENQ_DROP(ifq, m)     if_enq_drop(ifq, m)

#if defined(__GNUC__) && defined(MT_HEADER)

static __inline int

if_queue_drop(struct ifqueue *ifq, struct mbuf *m)

{

        IF_DROP(ifq);

        return 0;

}

static __inline int

if_enq_drop(struct ifqueue *ifq, struct mbuf *m)

{

        if (IF_QFULL(ifq) &&

            !if_queue_drop(ifq, m))

                return 0;

        IF_ENQUEUE(ifq, m);

        return 1;

}

#else

#ifdef MT_HEADER

int     if_enq_drop __P((struct ifqueue *, struct mbuf *));

#endif

#endif

/*

 * 72 was chosen below because it is the size of a TCP/IP

 * header (40) + the minimum mss (32).

 */

#define IF_MINMTU       72

#define IF_MAXMTU       65535

#endif /* _KERNEL */

#ifdef _KERNEL

#define IFQ_ENQUEUE(ifq, m, err)                                        \

do {                                                                    \

        if (IF_QFULL((ifq))) {                                          \

                m_freem((m));                                           \

                (err) = ENOBUFS;                                        \

        } else {                                                        \

                IF_ENQUEUE((ifq), (m));                                 \

                (err) = 0;                                               \

        }                                                               \

        if ((err))                                                      \

                (ifq)->ifq_drops++;                                     \

} while (0)

#define IFQ_DEQUEUE(ifq, m)     IF_DEQUEUE((ifq), (m))

#define IFQ_POLL(ifq, m)        IF_POLL((ifq), (m))

#define IFQ_PURGE(ifq)                                                  \

while (1) {                                                             \

        struct mbuf *m0;                                                \

        IF_DEQUEUE((ifq), m0);                                          \

        if (m0 == NULL)                                                 \

                break;                                                  \

        else                                                            \

                m_freem(m0);                                            \

}

#define IFQ_SET_READY(ifq)              ((void)0)

#define IFQ_CLASSIFY(ifq, m, af, pa)    ((void)0)

#define IFQ_IS_EMPTY(ifq)               ((ifq)->ifq_len == 0)

#define IFQ_INC_LEN(ifq)                ((ifq)->ifq_len++)

#define IFQ_DEC_LEN(ifq)                (--(ifq)->ifq_len)

#define IFQ_INC_DROPS(ifq)              ((ifq)->ifq_drops++)

#define IFQ_SET_MAXLEN(ifq, len)        ((ifq)->ifq_maxlen = (len))

#endif /* _KERNEL */

/*

 * The ifaddr structure contains information about one address

 * of an interface.  They are maintained by the different address families,

 * are allocated and attached when an address is set, and are linked

 * together so all addresses for an interface can be located.

 */

struct ifaddr {

        struct  sockaddr *ifa_addr;     /* address of interface */

        struct  sockaddr *ifa_dstaddr;  /* other end of p-to-p link */

#define ifa_broadaddr   ifa_dstaddr     /* broadcast address interface */

        struct  sockaddr *ifa_netmask;  /* used to determine subnet */

        struct  if_data if_data;        /* not all members are meaningful */

        struct  ifnet *ifa_ifp;         /* back-pointer to interface */

        TAILQ_ENTRY(ifaddr) ifa_link;   /* queue macro glue */

        void    (*ifa_rtrequest)        /* check or clean routes (+ or -)'d */

                __P((int, struct rtentry *, struct sockaddr *));

        u_short ifa_flags;              /* mostly rt_flags for cloning */

        u_int   ifa_refcnt;             /* references to this structure */

        int     ifa_metric;             /* cost of going out this interface */

#ifdef notdef

        struct  rtentry *ifa_rt;        /* XXXX for ROUTETOIF ????? */

#endif

        int (*ifa_claim_addr)           /* check if an addr goes to this if */

                __P((struct ifaddr *, struct sockaddr *));

};

#define IFA_ROUTE       RTF_UP          /* route installed */

#define IFAREF(ifa)     do { ++(ifa)->ifa_refcnt; } while (0)

/* for compatibility with other BSDs */

#define ifa_list        ifa_link

/*

 * The prefix structure contains information about one prefix

 * of an interface.  They are maintained by the different address families,

 * are allocated and attached when an prefix or an address is set,

 * and are linked together so all prefixes for an interface can be located.

 */

struct ifprefix {

        struct  sockaddr *ifpr_prefix;  /* prefix of interface */

        struct  ifnet *ifpr_ifp;        /* back-pointer to interface */

        TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */

        u_char  ifpr_plen;              /* prefix length in bits */

        u_char  ifpr_type;              /* protocol dependent prefix type */

};

/*

 * Multicast address structure.  This is analogous to the ifaddr

 * structure except that it keeps track of multicast addresses.

 * Also, the reference count here is a count of requests for this

 * address, not a count of pointers to this structure.

 */

struct ifmultiaddr {

        LIST_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */

        struct  sockaddr *ifma_addr;    /* address this membership is for */

        struct  sockaddr *ifma_lladdr;  /* link-layer translation, if any */

        struct  ifnet *ifma_ifp;        /* back-pointer to interface */

        u_int   ifma_refcount;          /* reference count */

        void    *ifma_protospec;        /* protocol-specific state, if any */

};

#ifdef _KERNEL

#define IFAFREE(ifa) \

        do { \

                if ((ifa)->ifa_refcnt <= 0) \

                        ifafree(ifa); \

                else \

                        (ifa)->ifa_refcnt--; \

        } while (0)

extern  struct ifnethead ifnet;

extern  struct ifnet    **ifindex2ifnet;

extern  int ifqmaxlen;

extern  struct ifnet loif[];

extern  int if_index;

extern  struct ifaddr **ifnet_addrs;

void    ether_ifattach __P((struct ifnet *, int));

void    ether_ifdetach __P((struct ifnet *, int));

void    ether_input __P((struct ifnet *, struct ether_header *, struct mbuf *));

void    ether_demux __P((struct ifnet *, struct ether_header *, struct mbuf *));

int     ether_output __P((struct ifnet *,

           struct mbuf *, struct sockaddr *, struct rtentry *));

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

int     ether_ioctl __P((struct ifnet *, int, caddr_t));

int     if_addmulti __P((struct ifnet *, struct sockaddr *,

                         struct ifmultiaddr **));

int     if_allmulti __P((struct ifnet *, int));

void    if_attach __P((struct ifnet *));

int     if_delmulti __P((struct ifnet *, struct sockaddr *));

void    if_detach __P((struct ifnet *));

void    if_down __P((struct ifnet *));

void    if_route __P((struct ifnet *, int flag, int fam));

int     if_setlladdr __P((struct ifnet *, const u_char *, int));

void    if_unroute __P((struct ifnet *, int flag, int fam));

void    if_up __P((struct ifnet *));

/*void  ifinit __P((void));*/ /* declared in systm.h for main() */

int     ifioctl __P((struct socket *, u_long, caddr_t, struct proc *));

int     ifpromisc __P((struct ifnet *, int));

struct  ifnet *ifunit __P((const char *));

struct  ifnet *if_withname __P((struct sockaddr *));

int     if_poll_recv_slow __P((struct ifnet *ifp, int *quotap));

void    if_poll_xmit_slow __P((struct ifnet *ifp, int *quotap));

void    if_poll_throttle __P((void));

void    if_poll_unthrottle __P((void *));

void    if_poll_init __P((void));

void    if_poll __P((void));

struct  ifaddr *ifa_ifwithaddr __P((struct sockaddr *));

struct  ifaddr *ifa_ifwithdstaddr __P((struct sockaddr *));

struct  ifaddr *ifa_ifwithnet __P((struct sockaddr *));

struct  ifaddr *ifa_ifwithroute __P((int, struct sockaddr *,

                                        struct sockaddr *));

struct  ifaddr *ifaof_ifpforaddr __P((struct sockaddr *, struct ifnet *));

void    ifafree __P((struct ifaddr *));

struct  ifmultiaddr *ifmaof_ifpforaddr __P((struct sockaddr *,

                                            struct ifnet *));

int     if_simloop __P((struct ifnet *ifp, struct mbuf *m, int af, int hlen));

void    if_clone_attach __P((struct if_clone *));

void    if_clone_detach __P((struct if_clone *));

int     if_clone_create __P((char *, int));

int     if_clone_destroy __P((const char *));

#endif /* _KERNEL */

#endif /* !_NET_IF_VAR_H_ */