bsd/net/bridge.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  * Copyright (c) 1998 Luigi Rizzo
  25  *
  26  * Redistribution and use in source and binary forms, with or without
  27  * modification, are permitted provided that the following conditions
  28  * are met:
  29  * 1. Redistributions of source code must retain the above copyright
  30  *    notice, this list of conditions and the following disclaimer.
  31  * 2. Redistributions in binary form must reproduce the above copyright
  32  *    notice, this list of conditions and the following disclaimer in the
  33  *    documentation and/or other materials provided with the distribution.
  34  *
  35  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  36  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  37  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  38  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  39  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  40  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  41  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  42  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  43  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  44  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  45  * SUCH DAMAGE.
  46  *
  47  */
  48 #ifndef _NET_BRIDGE_H_
  49 #define _NET_BRIDGE_H_
  50 #include <sys/appleapiopts.h>
  51
  52 #warning This is not used by Darwin, do not include
  53
  54 extern int do_bridge;
  55 /*
  56  * the hash table for bridge
  57  */
  58 typedef struct hash_table {
  59     struct ifnet *name ;
  60     unsigned char etheraddr[6] ;
  61     unsigned short used ;
  62 } bdg_hash_table ;
  63
  64 extern bdg_hash_table *bdg_table ;
  65
  66 /*
  67  * We need additional info for the bridge. The bdg_ifp2sc[] array
  68  * provides a pointer to this struct using the if_index.
  69  * bdg_softc has a backpointer to the struct ifnet, the bridge
  70  * flags, and a cluster (bridging occurs only between port of the
  71  * same cluster).
  72  */
  73 struct bdg_softc {
  74     struct ifnet *ifp ;
  75     /* also ((struct arpcom *)ifp)->ac_enaddr is the eth. addr */
  76     int flags ;
  77 #define IFF_BDG_PROMISC 0x0001  /* set promisc mode on this if.  */
  78 #define IFF_MUTE        0x0002  /* mute this if for bridging.   */
  79 #define IFF_USED        0x0004  /* use this if for bridging.    */
  80     short cluster_id ; /* in network format */
  81     u_long magic;
  82 } ;
  83
  84 extern struct bdg_softc *ifp2sc;
  85
  86 #define BDG_USED(ifp) (ifp2sc[ifp->if_index].flags & IFF_USED)
  87 #define BDG_MUTED(ifp) (ifp2sc[ifp->if_index].flags & IFF_MUTE)
  88 #define BDG_MUTE(ifp) ifp2sc[ifp->if_index].flags |= IFF_MUTE
  89 #define BDG_UNMUTE(ifp) ifp2sc[ifp->if_index].flags &= ~IFF_MUTE
  90 #define BDG_CLUSTER(ifp) (ifp2sc[ifp->if_index].cluster_id)
  91
  92 #define BDG_SAMECLUSTER(ifp,src) \
  93         (src == NULL || BDG_CLUSTER(ifp) == BDG_CLUSTER(src) )
  94
  95
  96 #define BDG_MAX_PORTS 128
  97 typedef struct _bdg_addr {
  98     unsigned char etheraddr[6] ;
  99     short cluster_id ;
 100 } bdg_addr ;
 101 extern bdg_addr bdg_addresses[BDG_MAX_PORTS];
 102 extern int bdg_ports ;
 103
 104 /*
 105  * out of the 6 bytes, the last ones are more "variable". Since
 106  * we are on a little endian machine, we have to do some gimmick...
 107  */
 108 #define HASH_SIZE 8192  /* must be a power of 2 */
 109 #define HASH_FN(addr)   (       \
 110         ntohs( ((short *)addr)[1] ^ ((short *)addr)[2] ) & (HASH_SIZE -1))
 111
 112 #define IFF_MUTE        IFF_LINK2       /* will need a separate flag... */
 113
 114 struct ifnet *bridge_in(struct ifnet *ifp, struct ether_header *eh);
 115 /* bdg_forward frees the mbuf if necessary, returning null */
 116 struct mbuf *bdg_forward(struct mbuf *m0, struct ether_header *eh, struct ifnet *dst);
 117
 118 #ifdef __i386__
 119 #define BDG_MATCH(a,b) ( \
 120     ((unsigned short *)(a))[2] == ((unsigned short *)(b))[2] && \
 121     *((unsigned int *)(a)) == *((unsigned int *)(b)) )
 122 #define IS_ETHER_BROADCAST(a) ( \
 123         *((unsigned int *)(a)) == 0xffffffff && \
 124         ((unsigned short *)(a))[2] == 0xffff )
 125 #else
 126 #warning... must complete these for the alpha etc.
 127 #define BDG_MATCH(a,b) (!bcmp(a, b, ETHER_ADDR_LEN) )
 128 #endif
 129 /*
 130  * The following constants are not legal ifnet pointers, and are used
 131  * as return values from the classifier, bridge_dst_lookup()
 132  * The same values are used as index in the statistics arrays,
 133  * with BDG_FORWARD replacing specifically forwarded packets.
 134  */
 135 #define BDG_BCAST       ( (struct ifnet *)1 )
 136 #define BDG_MCAST       ( (struct ifnet *)2 )
 137 #define BDG_LOCAL       ( (struct ifnet *)3 )
 138 #define BDG_DROP        ( (struct ifnet *)4 )
 139 #define BDG_UNKNOWN     ( (struct ifnet *)5 )
 140 #define BDG_IN          ( (struct ifnet *)7 )
 141 #define BDG_OUT         ( (struct ifnet *)8 )
 142 #define BDG_FORWARD     ( (struct ifnet *)9 )
 143
 144 #define PF_BDG 3 /* XXX superhack */
 145 /*
 146  * statistics, passed up with sysctl interface and ns -p bdg
 147  */
 148
 149 #define STAT_MAX (int)BDG_FORWARD
 150 struct bdg_port_stat {
 151     char name[16];
 152     u_long collisions;
 153     u_long p_in[STAT_MAX+1];
 154 } ;
 155
 156 struct bdg_stats {
 157     struct bdg_port_stat s[16];
 158 } ;
 159
 160
 161 #define BDG_STAT(ifp, type) bdg_stats.s[ifp->if_index].p_in[(int)type]++
 162
 163 #ifdef KERNEL
 164 /*
 165  * Find the right pkt destination:
 166  *      BDG_BCAST       is a broadcast
 167  *      BDG_MCAST       is a multicast
 168  *      BDG_LOCAL       is for a local address
 169  *      BDG_DROP        must be dropped
 170  *      other           ifp of the dest. interface (incl.self)
 171  *
 172  * We assume this is only called for interfaces for which bridging
 173  * is enabled, i.e. BDG_USED(ifp) is true.
 174  */
 175 static __inline
 176 struct ifnet *
 177 bridge_dst_lookup(struct ether_header *eh)
 178 {
 179     struct ifnet *dst ;
 180     int index ;
 181     bdg_addr *p ;
 182
 183     if (IS_ETHER_BROADCAST(eh->ether_dhost))
 184         return BDG_BCAST ;
 185     if (eh->ether_dhost[0] & 1)
 186         return BDG_MCAST ;
 187     /*
 188      * Lookup local addresses in case one matches.
 189      */
 190     for (index = bdg_ports, p = bdg_addresses ; index ; index--, p++ )
 191         if (BDG_MATCH(p->etheraddr, eh->ether_dhost) )
 192             return BDG_LOCAL ;
 193     /*
 194      * Look for a possible destination in table
 195      */
 196     index= HASH_FN( eh->ether_dhost );
 197     dst = bdg_table[index].name;
 198     if ( dst && BDG_MATCH( bdg_table[index].etheraddr, eh->ether_dhost) )
 199         return dst ;
 200     else
 201         return BDG_UNKNOWN ;
 202 }
 203
 204 #endif /* KERNEL */
 205
 206 #endif /* _NET_BRIDGE_H_ */