bsd/net/bridge.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1998 Luigi Rizzo
  24  *
  25  * Redistribution and use in source and binary forms, with or without
  26  * modification, are permitted provided that the following conditions
  27  * are met:
  28  * 1. Redistributions of source code must retain the above copyright
  29  *    notice, this list of conditions and the following disclaimer.
  30  * 2. Redistributions in binary form must reproduce the above copyright
  31  *    notice, this list of conditions and the following disclaimer in the
  32  *    documentation and/or other materials provided with the distribution.
  33  *
  34  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  35  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  36  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  37  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  38  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  39  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  40  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  41  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  42  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  43  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  44  * SUCH DAMAGE.
  45  *
  46  */
  47 #ifndef _NET_BRIDGE_H_
  48 #define _NET_BRIDGE_H_
  49 #include <sys/appleapiopts.h>
  50
  51 #warning This is not used by Darwin, do not include
  52
  53 extern int do_bridge;
  54 /*
  55  * the hash table for bridge
  56  */
  57 typedef struct hash_table {
  58     struct ifnet *name ;
  59     unsigned char etheraddr[6] ;
  60     unsigned short used ;
  61 } bdg_hash_table ;
  62
  63 extern bdg_hash_table *bdg_table ;
  64
  65 /*
  66  * We need additional info for the bridge. The bdg_ifp2sc[] array
  67  * provides a pointer to this struct using the if_index.
  68  * bdg_softc has a backpointer to the struct ifnet, the bridge
  69  * flags, and a cluster (bridging occurs only between port of the
  70  * same cluster).
  71  */
  72 struct bdg_softc {
  73     struct ifnet *ifp ;
  74     /* also ((struct arpcom *)ifp)->ac_enaddr is the eth. addr */
  75     int flags ;
  76 #define IFF_BDG_PROMISC 0x0001  /* set promisc mode on this if.  */
  77 #define IFF_MUTE        0x0002  /* mute this if for bridging.   */
  78 #define IFF_USED        0x0004  /* use this if for bridging.    */
  79     short cluster_id ; /* in network format */
  80     u_long magic;
  81 } ;
  82
  83 extern struct bdg_softc *ifp2sc;
  84
  85 #define BDG_USED(ifp) (ifp2sc[ifp->if_index].flags & IFF_USED)
  86 #define BDG_MUTED(ifp) (ifp2sc[ifp->if_index].flags & IFF_MUTE)
  87 #define BDG_MUTE(ifp) ifp2sc[ifp->if_index].flags |= IFF_MUTE
  88 #define BDG_UNMUTE(ifp) ifp2sc[ifp->if_index].flags &= ~IFF_MUTE
  89 #define BDG_CLUSTER(ifp) (ifp2sc[ifp->if_index].cluster_id)
  90
  91 #define BDG_SAMECLUSTER(ifp,src) \
  92         (src == NULL || BDG_CLUSTER(ifp) == BDG_CLUSTER(src) )
  93
  94
  95 #define BDG_MAX_PORTS 128
  96 typedef struct _bdg_addr {
  97     unsigned char etheraddr[6] ;
  98     short cluster_id ;
  99 } bdg_addr ;
 100 extern bdg_addr bdg_addresses[BDG_MAX_PORTS];
 101 extern int bdg_ports ;
 102
 103 /*
 104  * out of the 6 bytes, the last ones are more "variable". Since
 105  * we are on a little endian machine, we have to do some gimmick...
 106  */
 107 #define HASH_SIZE 8192  /* must be a power of 2 */
 108 #define HASH_FN(addr)   (       \
 109         ntohs( ((short *)addr)[1] ^ ((short *)addr)[2] ) & (HASH_SIZE -1))
 110
 111 #define IFF_MUTE        IFF_LINK2       /* will need a separate flag... */
 112
 113 struct ifnet *bridge_in(struct ifnet *ifp, struct ether_header *eh);
 114 /* bdg_forward frees the mbuf if necessary, returning null */
 115 struct mbuf *bdg_forward(struct mbuf *m0, struct ether_header *eh, struct ifnet *dst);
 116
 117 #ifdef __i386__
 118 #define BDG_MATCH(a,b) ( \
 119     ((unsigned short *)(a))[2] == ((unsigned short *)(b))[2] && \
 120     *((unsigned int *)(a)) == *((unsigned int *)(b)) )
 121 #define IS_ETHER_BROADCAST(a) ( \
 122         *((unsigned int *)(a)) == 0xffffffff && \
 123         ((unsigned short *)(a))[2] == 0xffff )
 124 #else
 125 #warning... must complete these for the alpha etc.
 126 #define BDG_MATCH(a,b) (!bcmp(a, b, ETHER_ADDR_LEN) )
 127 #endif
 128 /*
 129  * The following constants are not legal ifnet pointers, and are used
 130  * as return values from the classifier, bridge_dst_lookup()
 131  * The same values are used as index in the statistics arrays,
 132  * with BDG_FORWARD replacing specifically forwarded packets.
 133  */
 134 #define BDG_BCAST       ( (struct ifnet *)1 )
 135 #define BDG_MCAST       ( (struct ifnet *)2 )
 136 #define BDG_LOCAL       ( (struct ifnet *)3 )
 137 #define BDG_DROP        ( (struct ifnet *)4 )
 138 #define BDG_UNKNOWN     ( (struct ifnet *)5 )
 139 #define BDG_IN          ( (struct ifnet *)7 )
 140 #define BDG_OUT         ( (struct ifnet *)8 )
 141 #define BDG_FORWARD     ( (struct ifnet *)9 )
 142
 143 #define PF_BDG 3 /* XXX superhack */
 144 /*
 145  * statistics, passed up with sysctl interface and ns -p bdg
 146  */
 147
 148 #define STAT_MAX (int)BDG_FORWARD
 149 struct bdg_port_stat {
 150     char name[16];
 151     u_long collisions;
 152     u_long p_in[STAT_MAX+1];
 153 } ;
 154
 155 struct bdg_stats {
 156     struct bdg_port_stat s[16];
 157 } ;
 158
 159
 160 #define BDG_STAT(ifp, type) bdg_stats.s[ifp->if_index].p_in[(int)type]++
 161
 162 #ifdef KERNEL
 163 /*
 164  * Find the right pkt destination:
 165  *      BDG_BCAST       is a broadcast
 166  *      BDG_MCAST       is a multicast
 167  *      BDG_LOCAL       is for a local address
 168  *      BDG_DROP        must be dropped
 169  *      other           ifp of the dest. interface (incl.self)
 170  *
 171  * We assume this is only called for interfaces for which bridging
 172  * is enabled, i.e. BDG_USED(ifp) is true.
 173  */
 174 static __inline
 175 struct ifnet *
 176 bridge_dst_lookup(struct ether_header *eh)
 177 {
 178     struct ifnet *dst ;
 179     int index ;
 180     bdg_addr *p ;
 181
 182     if (IS_ETHER_BROADCAST(eh->ether_dhost))
 183         return BDG_BCAST ;
 184     if (eh->ether_dhost[0] & 1)
 185         return BDG_MCAST ;
 186     /*
 187      * Lookup local addresses in case one matches.
 188      */
 189     for (index = bdg_ports, p = bdg_addresses ; index ; index--, p++ )
 190         if (BDG_MATCH(p->etheraddr, eh->ether_dhost) )
 191             return BDG_LOCAL ;
 192     /*
 193      * Look for a possible destination in table
 194      */
 195     index= HASH_FN( eh->ether_dhost );
 196     dst = bdg_table[index].name;
 197     if ( dst && BDG_MATCH( bdg_table[index].etheraddr, eh->ether_dhost) )
 198         return dst ;
 199     else
 200         return BDG_UNKNOWN ;
 201 }
 202
 203 #endif /* KERNEL */
 204
 205 #endif /* _NET_BRIDGE_H_ */