143 lines
4.5 KiB
C
143 lines
4.5 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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#define BDG_MAX_PORTS 128
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extern unsigned char bdg_addresses[6*BDG_MAX_PORTS];
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extern int bdg_ports ;
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extern void bdgtakeifaces(void);
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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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struct ifnet *bridge_in(struct ifnet *ifp, struct ether_header *eh);
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/* bdg_forward frees the mbuf if necessary, returning null */
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int bdg_forward(struct mbuf **m0, struct ether_header *eh, struct ifnet *dst);
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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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#warning... must complete these for the alpha etc.
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#define BDG_MATCH(a,b) (!bcmp(a, b, ETHER_ADDR_LEN) )
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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[(int)type]++
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#ifdef _KERNEL
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/*
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* Find the right pkt destination:
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* BDG_BCAST is a broadcast
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* BDG_MCAST is a multicast
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* BDG_LOCAL is for a local address
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* BDG_DROP must be dropped
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* other ifp of the dest. interface (incl.self)
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*/
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static __inline
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struct ifnet *
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bridge_dst_lookup(struct ether_header *eh)
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{
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struct ifnet *dst ;
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int index ;
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u_char *eth_addr = bdg_addresses ;
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if (IS_ETHER_BROADCAST(eh->ether_dhost))
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return BDG_BCAST ;
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if (eh->ether_dhost[0] & 1)
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return BDG_MCAST ;
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/*
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* Lookup local addresses in case one matches.
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*/
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for (index = bdg_ports, eth_addr = bdg_addresses ;
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index ; index--, eth_addr += 6 )
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if (BDG_MATCH(eth_addr, eh->ether_dhost) )
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return BDG_LOCAL ;
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/*
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* Look for a possible destination in table
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*/
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index= HASH_FN( eh->ether_dhost );
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dst = bdg_table[index].name;
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if ( dst && BDG_MATCH( bdg_table[index].etheraddr, eh->ether_dhost) )
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return dst ;
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else
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return BDG_UNKNOWN ;
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}
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#endif /* KERNEL */
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