mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-15 10:17:20 +00:00
143 lines
4.5 KiB
C
143 lines
4.5 KiB
C
/*
|
|
* Copyright (c) 1998 Luigi Rizzo
|
|
*
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
extern int do_bridge;
|
|
/*
|
|
* the hash table for bridge
|
|
*/
|
|
typedef struct hash_table {
|
|
struct ifnet *name ;
|
|
unsigned char etheraddr[6] ;
|
|
unsigned short used ;
|
|
} bdg_hash_table ;
|
|
|
|
extern bdg_hash_table *bdg_table ;
|
|
|
|
#define BDG_MAX_PORTS 128
|
|
extern unsigned char bdg_addresses[6*BDG_MAX_PORTS];
|
|
extern int bdg_ports ;
|
|
|
|
/*
|
|
* out of the 6 bytes, the last ones are more "variable". Since
|
|
* we are on a little endian machine, we have to do some gimmick...
|
|
*/
|
|
#define HASH_SIZE 8192 /* must be a power of 2 */
|
|
#define HASH_FN(addr) ( \
|
|
ntohs( ((short *)addr)[1] ^ ((short *)addr)[2] ) & (HASH_SIZE -1))
|
|
|
|
#define IFF_MUTE IFF_LINK2 /* will need a separate flag... */
|
|
|
|
struct ifnet *bridge_in(struct mbuf *m);
|
|
/* bdg_forward frees the mbuf if necessary, returning null */
|
|
int bdg_forward (struct mbuf **m, struct ifnet *dst);
|
|
|
|
#ifdef __i386__
|
|
#define BDG_MATCH(a,b) ( \
|
|
((unsigned short *)(a))[2] == ((unsigned short *)(b))[2] && \
|
|
*((unsigned int *)(a)) == *((unsigned int *)(b)) )
|
|
#define IS_ETHER_BROADCAST(a) ( \
|
|
*((unsigned int *)(a)) == 0xffffffff && \
|
|
((unsigned short *)(a))[2] == 0xffff )
|
|
#else
|
|
#warning... must complete these for the alpha etc.
|
|
#define BDG_MATCH(a,b) (!bcmp(a, b, ETHER_ADDR_LEN) )
|
|
#endif
|
|
/*
|
|
* 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.
|
|
*/
|
|
#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 )
|
|
|
|
#define PF_BDG 3 /* XXX superhack */
|
|
/*
|
|
* statistics, passed up with sysctl interface and ns -p bdg
|
|
*/
|
|
|
|
#define STAT_MAX (int)BDG_FORWARD
|
|
struct bdg_port_stat {
|
|
char name[16];
|
|
u_long collisions;
|
|
u_long p_in[STAT_MAX+1];
|
|
} ;
|
|
|
|
struct bdg_stats {
|
|
struct bdg_port_stat s[16];
|
|
} ;
|
|
|
|
|
|
#define BDG_STAT(ifp, type) bdg_stats.s[ifp->if_index].p_in[(int)type]++
|
|
|
|
#ifdef KERNEL
|
|
/*
|
|
* Find the right pkt destination:
|
|
* BDG_BCAST is a broadcast
|
|
* BDG_MCAST is a multicast
|
|
* BDG_LOCAL is for a local address
|
|
* BDG_DROP must be dropped
|
|
* other ifp of the dest. interface (incl.self)
|
|
*/
|
|
static __inline
|
|
struct ifnet *
|
|
bridge_dst_lookup(struct mbuf *m)
|
|
{
|
|
struct ether_header *eh = mtod(m, struct ether_header *);
|
|
struct ifnet *dst ;
|
|
int index ;
|
|
u_char *eth_addr = bdg_addresses ;
|
|
|
|
if (IS_ETHER_BROADCAST(eh->ether_dhost))
|
|
return BDG_BCAST ;
|
|
if (eh->ether_dhost[0] & 1)
|
|
return BDG_MCAST ;
|
|
/*
|
|
* Lookup local addresses in case one matches.
|
|
*/
|
|
for (index = bdg_ports, eth_addr = bdg_addresses ;
|
|
index ; index--, eth_addr += 6 )
|
|
if (BDG_MATCH(eth_addr, eh->ether_dhost) )
|
|
return BDG_LOCAL ;
|
|
/*
|
|
* Look for a possible destination in table
|
|
*/
|
|
index= HASH_FN( eh->ether_dhost );
|
|
dst = bdg_table[index].name;
|
|
if ( dst && BDG_MATCH( bdg_table[index].etheraddr, eh->ether_dhost) )
|
|
return dst ;
|
|
else
|
|
return BDG_UNKNOWN ;
|
|
}
|
|
|
|
#endif /* KERNEL */
|