150 lines
5.2 KiB
C
150 lines
5.2 KiB
C
/*
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* Copyright (c) 1998-2000 Luigi Rizzo
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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extern int do_bridge;
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/*
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* the hash table for bridge
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*/
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typedef struct hash_table {
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struct ifnet *name ;
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unsigned char etheraddr[6] ;
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unsigned short used ;
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} bdg_hash_table ;
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extern bdg_hash_table *bdg_table ;
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/*
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* We need additional info for the bridge. The bdg_ifp2sc[] array
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* provides a pointer to this struct using the if_index.
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* bdg_softc has a backpointer to the struct ifnet, the bridge
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* flags, and a cluster (bridging occurs only between port of the
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* same cluster).
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*/
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struct bdg_softc {
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struct ifnet *ifp ;
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/* also ((struct arpcom *)ifp)->ac_enaddr is the eth. addr */
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int flags ;
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#define IFF_BDG_PROMISC 0x0001 /* set promisc mode on this if. */
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#define IFF_MUTE 0x0002 /* mute this if for bridging. */
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#define IFF_USED 0x0004 /* use this if for bridging. */
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short cluster_id ; /* in network format */
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u_long magic;
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} ;
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extern struct bdg_softc *ifp2sc;
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#define BDG_USED(ifp) (ifp2sc[ifp->if_index].flags & IFF_USED)
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#define BDG_MUTED(ifp) (ifp2sc[ifp->if_index].flags & IFF_MUTE)
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#define BDG_MUTE(ifp) ifp2sc[ifp->if_index].flags |= IFF_MUTE
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#define BDG_UNMUTE(ifp) ifp2sc[ifp->if_index].flags &= ~IFF_MUTE
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#define BDG_CLUSTER(ifp) (ifp2sc[ifp->if_index].cluster_id)
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#define BDG_EH(ifp) ((struct arpcom *)ifp)->ac_enaddr
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#define BDG_SAMECLUSTER(ifp,src) \
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(src == NULL || BDG_CLUSTER(ifp) == BDG_CLUSTER(src) )
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/*
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* BDG_ACTIVE(ifp) does all checks to see if bridging is loaded,
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* activated and used on a given interface.
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*/
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#define BDG_ACTIVE(ifp) (do_bridge && BDG_LOADED && BDG_USED(ifp))
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#define BDG_MAX_PORTS 128
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typedef struct _bdg_addr {
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unsigned char etheraddr[6] ;
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short cluster_id ;
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} bdg_addr ;
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extern bdg_addr bdg_addresses[BDG_MAX_PORTS];
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extern int bdg_ports ;
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/*
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* out of the 6 bytes, the last ones are more "variable". Since
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* we are on a little endian machine, we have to do some gimmick...
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*/
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#define HASH_SIZE 8192 /* must be a power of 2 */
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#define HASH_FN(addr) ( \
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ntohs( ((short *)addr)[1] ^ ((short *)addr)[2] ) & (HASH_SIZE -1))
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#ifdef __i386__
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#define BDG_MATCH(a,b) ( \
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((unsigned short *)(a))[2] == ((unsigned short *)(b))[2] && \
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*((unsigned int *)(a)) == *((unsigned int *)(b)) )
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#define IS_ETHER_BROADCAST(a) ( \
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*((unsigned int *)(a)) == 0xffffffff && \
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((unsigned short *)(a))[2] == 0xffff )
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#else
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/* for machines that do not support unaligned access */
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#define BDG_MATCH(a,b) (!bcmp(a, b, ETHER_ADDR_LEN) )
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#define IS_ETHER_BROADCAST(a) (!bcmp(a, "\377\377\377\377\377\377", 6))
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#endif
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/*
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* The following constants are not legal ifnet pointers, and are used
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* as return values from the classifier, bridge_dst_lookup()
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* The same values are used as index in the statistics arrays,
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* with BDG_FORWARD replacing specifically forwarded packets.
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*/
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#define BDG_BCAST ( (struct ifnet *)1 )
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#define BDG_MCAST ( (struct ifnet *)2 )
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#define BDG_LOCAL ( (struct ifnet *)3 )
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#define BDG_DROP ( (struct ifnet *)4 )
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#define BDG_UNKNOWN ( (struct ifnet *)5 )
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#define BDG_IN ( (struct ifnet *)7 )
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#define BDG_OUT ( (struct ifnet *)8 )
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#define BDG_FORWARD ( (struct ifnet *)9 )
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#define PF_BDG 3 /* XXX superhack */
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/*
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* statistics, passed up with sysctl interface and ns -p bdg
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*/
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#define STAT_MAX (int)BDG_FORWARD
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struct bdg_port_stat {
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char name[16];
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u_long collisions;
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u_long p_in[STAT_MAX+1];
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} ;
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struct bdg_stats {
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struct bdg_port_stat s[16];
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} ;
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#define BDG_STAT(ifp, type) bdg_stats.s[ifp->if_index].p_in[(long)type]++
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#ifdef _KERNEL
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typedef struct ifnet *bridge_in_t(struct ifnet *, struct ether_header *);
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/* bdg_forward frees the mbuf if necessary, returning null */
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typedef struct mbuf *bdg_forward_t(struct mbuf *, struct ether_header *const,
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struct ifnet *);
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typedef void bdgtakeifaces_t(void);
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extern bridge_in_t *bridge_in_ptr;
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extern bdg_forward_t *bdg_forward_ptr;
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extern bdgtakeifaces_t *bdgtakeifaces_ptr;
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#define BDG_LOADED (bdgtakeifaces_ptr != NULL)
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#endif /* KERNEL */
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