FreeBSD/Linux Kernel Cross Reference
sys/net/bridge.h

     /*
      * Copyright (c) 1998-2002 Luigi Rizzo
      *
      * Work partly supported by: Cisco Systems, Inc. - NSITE lab, RTP, NC
      *
      * 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.
     *
     * 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.
     *
     * $FreeBSD: releng/5.1/sys/net/bridge.h 106939 2002-11-15 00:00:15Z sam $
     */
    
    extern int do_bridge;
    
    /*
     * We need additional per-interface info for the bridge, which is
     * stored in a struct bdg_softc. The ifp2sc[] array provides a pointer
     * to this struct using the if_index as a mapping key.
     * bdg_softc has a backpointer to the struct ifnet, the bridge
     * flags, and a cluster (bridging occurs only between port of the
     * same cluster).
     */
    
    struct cluster_softc;   /* opaque here, defined in bridge.c */
    
    struct bdg_softc {
        struct ifnet *ifp ;
        /* also ((struct arpcom *)ifp)->ac_enaddr is the eth. addr */
        int flags ;
    #define IFF_BDG_PROMISC 0x0001  /* set promisc mode on this if. */
    #define IFF_MUTE        0x0002  /* mute this if for bridging.   */
    #define IFF_USED        0x0004  /* use this if for bridging.    */
        struct cluster_softc *cluster;
    } ;
    
    extern struct bdg_softc *ifp2sc;
    
    #define BDG_USED(ifp) (ifp2sc[ifp->if_index].flags & IFF_USED)
    /*
     * BDG_ACTIVE(ifp) does all checks to see if bridging is enabled, loaded,
     * and used on a given interface.
     */
    #define BDG_ACTIVE(ifp) (do_bridge && BDG_LOADED && BDG_USED(ifp))
    
    /*
     * The following constants are not legal ifnet pointers, and are used
     * as return values from the classifier, bridge_dst_lookup().
     * The same values are used as index in the statistics arrays,
     * with BDG_FORWARD replacing specifically forwarded packets.
     *
     * These constants are here because they are used in 'netstat'
     * to show bridge statistics.
     */
    #define BDG_BCAST       ( (struct ifnet *)1 )
    #define BDG_MCAST       ( (struct ifnet *)2 )
    #define BDG_LOCAL       ( (struct ifnet *)3 )
    #define BDG_DROP        ( (struct ifnet *)4 )
    #define BDG_UNKNOWN     ( (struct ifnet *)5 )
    #define BDG_IN          ( (struct ifnet *)7 )
    #define BDG_OUT         ( (struct ifnet *)8 )
    #define BDG_FORWARD     ( (struct ifnet *)9 )
    
    /*
     * Statistics are passed up with the sysctl interface, "netstat -p bdg"
     * reads them. PF_BDG defines the 'bridge' protocol family.
     */
    
    #define PF_BDG 3 /* XXX superhack */
    
    #define STAT_MAX (int)BDG_FORWARD
    struct bdg_port_stat {
        char name[16];
        u_long collisions;
        u_long p_in[STAT_MAX+1];
    } ;
    
    /* XXX this should be made dynamic */
    #define BDG_MAX_PORTS 128
    struct bdg_stats {
        struct bdg_port_stat s[BDG_MAX_PORTS];
    } ;
    
   
   #define BDG_STAT(ifp, type) bdg_stats.s[ifp->if_index].p_in[(uintptr_t)type]++ 
    
   #ifdef _KERNEL
   typedef struct ifnet *bridge_in_t(struct ifnet *, struct ether_header *);
   /* bdg_forward frees the mbuf if necessary, returning null */
   typedef struct mbuf *bdg_forward_t(struct mbuf *, struct ifnet *);
   typedef void bdgtakeifaces_t(void);
   extern  bridge_in_t *bridge_in_ptr;
   extern  bdg_forward_t *bdg_forward_ptr;
   extern  bdgtakeifaces_t *bdgtakeifaces_ptr;
   
   #define BDG_LOADED      (bdgtakeifaces_ptr != NULL)
   #endif /* KERNEL */

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