664a31e496
is an application space macro and the applications are supposed to be free to use it as they please (but cannot). This is consistant with the other BSD's who made this change quite some time ago. More commits to come.
144 lines
4.5 KiB
C
144 lines
4.5 KiB
C
/*
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* Copyright (c) 1998 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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/*
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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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#define IFF_MUTE IFF_LINK2 /* will need a separate flag... */
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struct ifnet *bridge_in(struct mbuf *m);
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/* bdg_forward frees the mbuf if necessary, returning null */
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int bdg_forward (struct mbuf **m, 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 mbuf *m)
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{
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struct ether_header *eh = mtod(m, struct ether_header *);
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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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