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/*

 * 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.

 *

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

 * $Id: if.h,v 1.1.1.1 2001-07-10 09:58:26 chris Exp $

 */

#ifndef _NET_IF_H_

#define _NET_IF_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

 */

#ifndef _TIME_ /*  XXX fast fix for SNMP, going away soon */

#include <sys/time.h>

#endif

#ifdef __STDC__

/*

 * Forward structure declarations for function prototypes [sic].

 */

struct  mbuf;

struct  proc;

struct  rtentry;

struct  socket;

struct  ether_header;

#endif

/*

 * Structure describing information about an interface

 * which may be of interest to management entities.

 */

struct if_data {

        /* generic interface information */

        u_char  ifi_type;               /* ethernet, tokenring, etc */

        u_char  ifi_physical;           /* e.g., AUI, Thinnet, 10base-T, etc */

        u_char  ifi_addrlen;            /* media address length */

        u_char  ifi_hdrlen;             /* media header length */

        u_char  ifi_recvquota;          /* polling quota for receive intrs */

        u_char  ifi_xmitquota;          /* polling quota for xmit intrs */

        u_long  ifi_mtu;                /* maximum transmission unit */

        u_long  ifi_metric;             /* routing metric (external only) */

        u_long  ifi_baudrate;           /* linespeed */

        /* volatile statistics */

        u_long  ifi_ipackets;           /* packets received on interface */

        u_long  ifi_ierrors;            /* input errors on interface */

        u_long  ifi_opackets;           /* packets sent on interface */

        u_long  ifi_oerrors;            /* output errors on interface */

        u_long  ifi_collisions;         /* collisions on csma interfaces */

        u_long  ifi_ibytes;             /* total number of octets received */

        u_long  ifi_obytes;             /* total number of octets sent */

        u_long  ifi_imcasts;            /* packets received via multicast */

        u_long  ifi_omcasts;            /* packets sent via multicast */

        u_long  ifi_iqdrops;            /* dropped on input, this interface */

        u_long  ifi_noproto;            /* destined for unsupported protocol */

        u_long  ifi_recvtiming;         /* usec spent receiving when timing */

        u_long  ifi_xmittiming;         /* usec spent xmitting when timing */

        struct  timeval ifi_lastchange; /* time of last administrative change */

};

/*

 * 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'' */

        struct  ifnet *if_next;         /* all struct ifnets are chained */

        struct  ifaddr *if_addrlist;    /* linked list of addresses per if */

        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;

/* 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 *, int, 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_tap)               /* Packet filter routine */

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

        struct  ifqueue if_snd;         /* output queue */

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

};

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_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)

#define IFF_UP          0x1             /* interface is up */

#define IFF_BROADCAST   0x2             /* broadcast address valid */

#define IFF_DEBUG       0x4             /* turn on debugging */

#define IFF_LOOPBACK    0x8             /* is a loopback net */

#define IFF_POINTOPOINT 0x10            /* interface is point-to-point link */

/*#define IFF_NOTRAILERS 0x20            * obsolete: avoid use of trailers */

#define IFF_RUNNING     0x40            /* resources allocated */

#define IFF_NOARP       0x80            /* no address resolution protocol */

#define IFF_PROMISC     0x100           /* receive all packets */

#define IFF_ALLMULTI    0x200           /* receive all multicast packets */

#define IFF_OACTIVE     0x400           /* transmission in progress */

#define IFF_SIMPLEX     0x800           /* can't hear own transmissions */

#define IFF_LINK0       0x1000          /* per link layer defined bit */

#define IFF_LINK1       0x2000          /* per link layer defined bit */

#define IFF_LINK2       0x4000          /* per link layer defined bit */

#define IFF_ALTPHYS     IFF_LINK2       /* use alternate physical connection */

#define IFF_MULTICAST   0x8000          /* supports multicast */

/* flags set internally only: */

#define IFF_CANTCHANGE \

        (IFF_BROADCAST|IFF_POINTOPOINT|IFF_RUNNING|IFF_OACTIVE|\

            IFF_SIMPLEX|IFF_MULTICAST|IFF_ALLMULTI)

/*

 * These really don't belong here, but there's no other obviously appropriate

 * location.

 */

#define IFP_AUI         0

#define IFP_10BASE2     1

#define IFP_10BASET     2

/* etc. */

/*

 * 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) { \

/* printf(" IF_ENQUEUE: %p %p\n", 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) { \

/* printf(" IF_PREPEND: %p %p\n", 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) { \

/* printf(" IF_DEQUEUE: %p %p\n", ifq, m ); */ \

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

                        (ifq)->ifq_tail = 0; \

                (m)->m_nextpkt = 0; \

                (ifq)->ifq_len--; \

        } \

}

#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

#endif /* KERNEL */

#define IFQ_MAXLEN      50

#define IFNET_SLOWHZ    1               /* granularity is 1 second */

/*

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

        struct  ifaddr *ifa_next;       /* next address for interface */

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

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

        u_short ifa_flags;              /* mostly rt_flags for cloning */

        short   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 */

/*

 * Message format for use in obtaining information about interfaces

 * from getkerninfo and the routing socket

 */

struct if_msghdr {

        u_short ifm_msglen;     /* to skip over non-understood messages */

        u_char  ifm_version;    /* future binary compatability */

        u_char  ifm_type;       /* message type */

        int     ifm_addrs;      /* like rtm_addrs */

        int     ifm_flags;      /* value of if_flags */

        u_short ifm_index;      /* index for associated ifp */

        struct  if_data ifm_data;/* statistics and other data about if */

};

/*

 * Message format for use in obtaining information about interface addresses

 * from getkerninfo and the routing socket

 */

struct ifa_msghdr {

        u_short ifam_msglen;    /* to skip over non-understood messages */

        u_char  ifam_version;   /* future binary compatability */

        u_char  ifam_type;      /* message type */

        int     ifam_addrs;     /* like rtm_addrs */

        int     ifam_flags;     /* value of ifa_flags */

        u_short ifam_index;     /* index for associated ifp */

        int     ifam_metric;    /* value of ifa_metric */

};

/*

 * Interface request structure used for socket

 * ioctl's.  All interface ioctl's must have parameter

 * definitions which begin with ifr_name.  The

 * remainder may be interface specific.

 */

struct  ifreq {

#define IFNAMSIZ        16

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

        union {

                struct  sockaddr ifru_addr;

                struct  sockaddr ifru_dstaddr;

                struct  sockaddr ifru_broadaddr;

                short   ifru_flags;

                int     ifru_metric;

                int     ifru_mtu;

                int     ifru_phys;

                int     ifru_media;

                caddr_t ifru_data;

                int     (*ifru_tap)(struct ifnet *, struct ether_header *, struct mbuf *);

        } ifr_ifru;

#define ifr_addr        ifr_ifru.ifru_addr      /* address */

#define ifr_dstaddr     ifr_ifru.ifru_dstaddr   /* other end of p-to-p link */

#define ifr_broadaddr   ifr_ifru.ifru_broadaddr /* broadcast address */

#define ifr_flags       ifr_ifru.ifru_flags     /* flags */

#define ifr_metric      ifr_ifru.ifru_metric    /* metric */

#define ifr_mtu         ifr_ifru.ifru_mtu       /* mtu */

#define ifr_phys        ifr_ifru.ifru_phys      /* physical wire */

#define ifr_media       ifr_ifru.ifru_media     /* physical media */

#define ifr_data        ifr_ifru.ifru_data      /* for use by interface */

#define ifr_tap         ifr_ifru.ifru_tap       /* tap function */

};

struct ifaliasreq {

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

        struct  sockaddr ifra_addr;

        struct  sockaddr ifra_broadaddr;

        struct  sockaddr ifra_mask;

};

struct ifmediareq {

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

        int     ifm_current;            /* current media options */

        int     ifm_mask;               /* don't care mask */

        int     ifm_status;             /* media status */

        int     ifm_active;             /* active options */

        int     ifm_count;              /* # entries in ifm_ulist array */

        int     *ifm_ulist;             /* media words */

};

/*

 * Structure used in SIOCGIFCONF request.

 * Used to retrieve interface configuration

 * for machine (useful for programs which

 * must know all networks accessible).

 */

struct  ifconf {

        int     ifc_len;                /* size of associated buffer */

        union {

                caddr_t ifcu_buf;

                struct  ifreq *ifcu_req;

        } ifc_ifcu;

#define ifc_buf ifc_ifcu.ifcu_buf       /* buffer address */

#define ifc_req ifc_ifcu.ifcu_req       /* array of structures returned */

};

#include <net/if_arp.h>

#ifdef KERNEL

#define IFAFREE(ifa) \

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

                ifafree(ifa); \

        else \

                (ifa)->ifa_refcnt--;

extern struct   ifnet   *ifnet;

extern int      ifqmaxlen;

extern struct   ifnet   loif[];

extern int      if_index;

extern struct   ifaddr  **ifnet_addrs;

void    ether_ifattach __P((struct ifnet *));

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

int     ether_output __P((struct ifnet *,

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

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

void    if_attach __P((struct ifnet *));

void    if_down __P((struct ifnet *));

void    if_up __P((struct ifnet *));

#ifdef vax

void    ifubareset __P((int));

#endif

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

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

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

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

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 *));

int     looutput __P((struct ifnet *,

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

#endif /* KERNEL */

#endif /* !_NET_IF_H_ */