1/* 2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_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. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28/* 29 * Copyright (c) 1998 Luigi Rizzo 30 * 31 * Redistribution and use in source and binary forms, with or without 32 * modification, are permitted provided that the following conditions 33 * are met: 34 * 1. Redistributions of source code must retain the above copyright 35 * notice, this list of conditions and the following disclaimer. 36 * 2. Redistributions in binary form must reproduce the above copyright 37 * notice, this list of conditions and the following disclaimer in the 38 * documentation and/or other materials provided with the distribution. 39 * 40 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 */ 53#ifndef _NET_BRIDGE_H_ 54#define _NET_BRIDGE_H_ 55#include <sys/appleapiopts.h> 56 57#warning This is not used by Darwin, do not include 58 59extern int do_bridge; 60/* 61 * the hash table for bridge 62 */ 63typedef struct hash_table { 64 struct ifnet *name ; 65 unsigned char etheraddr[6] ; 66 unsigned short used ; 67} bdg_hash_table ; 68 69extern bdg_hash_table *bdg_table ; 70 71/* 72 * We need additional info for the bridge. The bdg_ifp2sc[] array 73 * provides a pointer to this struct using the if_index. 74 * bdg_softc has a backpointer to the struct ifnet, the bridge 75 * flags, and a cluster (bridging occurs only between port of the 76 * same cluster). 77 */ 78struct bdg_softc { 79 struct ifnet *ifp ; 80 /* also ((struct arpcom *)ifp)->ac_enaddr is the eth. addr */ 81 int flags ; 82#define IFF_BDG_PROMISC 0x0001 /* set promisc mode on this if. */ 83#define IFF_MUTE 0x0002 /* mute this if for bridging. */ 84#define IFF_USED 0x0004 /* use this if for bridging. */ 85 short cluster_id ; /* in network format */ 86 u_long magic; 87} ; 88 89extern struct bdg_softc *ifp2sc; 90 91#define BDG_USED(ifp) (ifp2sc[ifp->if_index].flags & IFF_USED) 92#define BDG_MUTED(ifp) (ifp2sc[ifp->if_index].flags & IFF_MUTE) 93#define BDG_MUTE(ifp) ifp2sc[ifp->if_index].flags |= IFF_MUTE 94#define BDG_UNMUTE(ifp) ifp2sc[ifp->if_index].flags &= ~IFF_MUTE 95#define BDG_CLUSTER(ifp) (ifp2sc[ifp->if_index].cluster_id) 96 97#define BDG_SAMECLUSTER(ifp,src) \ 98 (src == NULL || BDG_CLUSTER(ifp) == BDG_CLUSTER(src) ) 99 100 101#define BDG_MAX_PORTS 128 102typedef struct _bdg_addr { 103 unsigned char etheraddr[6] ; 104 short cluster_id ; 105} bdg_addr ; 106extern bdg_addr bdg_addresses[BDG_MAX_PORTS]; 107extern int bdg_ports ; 108 109/* 110 * out of the 6 bytes, the last ones are more "variable". Since 111 * we are on a little endian machine, we have to do some gimmick... 112 */ 113#define HASH_SIZE 8192 /* must be a power of 2 */ 114#define HASH_FN(addr) ( \ 115 ntohs( ((short *)addr)[1] ^ ((short *)addr)[2] ) & (HASH_SIZE -1)) 116 117#define IFF_MUTE IFF_LINK2 /* will need a separate flag... */ 118 119struct ifnet *bridge_in(struct ifnet *ifp, struct ether_header *eh); 120/* bdg_forward frees the mbuf if necessary, returning null */ 121struct mbuf *bdg_forward(struct mbuf *m0, struct ether_header *eh, struct ifnet *dst); 122 123#ifdef __i386__ 124#define BDG_MATCH(a,b) ( \ 125 ((unsigned short *)(a))[2] == ((unsigned short *)(b))[2] && \ 126 *((unsigned int *)(a)) == *((unsigned int *)(b)) ) 127#define IS_ETHER_BROADCAST(a) ( \ 128 *((unsigned int *)(a)) == 0xffffffff && \ 129 ((unsigned short *)(a))[2] == 0xffff ) 130#else 131#warning... must complete these for the alpha etc. 132#define BDG_MATCH(a,b) (!bcmp(a, b, ETHER_ADDR_LEN) ) 133#endif 134/* 135 * The following constants are not legal ifnet pointers, and are used 136 * as return values from the classifier, bridge_dst_lookup() 137 * The same values are used as index in the statistics arrays, 138 * with BDG_FORWARD replacing specifically forwarded packets. 139 */ 140#define BDG_BCAST ( (struct ifnet *)1 ) 141#define BDG_MCAST ( (struct ifnet *)2 ) 142#define BDG_LOCAL ( (struct ifnet *)3 ) 143#define BDG_DROP ( (struct ifnet *)4 ) 144#define BDG_UNKNOWN ( (struct ifnet *)5 ) 145#define BDG_IN ( (struct ifnet *)7 ) 146#define BDG_OUT ( (struct ifnet *)8 ) 147#define BDG_FORWARD ( (struct ifnet *)9 ) 148 149#define PF_BDG 3 /* XXX superhack */ 150/* 151 * statistics, passed up with sysctl interface and ns -p bdg 152 */ 153 154#define STAT_MAX (int)BDG_FORWARD 155struct bdg_port_stat { 156 char name[16]; 157 u_long collisions; 158 u_long p_in[STAT_MAX+1]; 159} ; 160 161struct bdg_stats { 162 struct bdg_port_stat s[16]; 163} ; 164 165 166#define BDG_STAT(ifp, type) bdg_stats.s[ifp->if_index].p_in[(int)type]++ 167 168#ifdef KERNEL 169/* 170 * Find the right pkt destination: 171 * BDG_BCAST is a broadcast 172 * BDG_MCAST is a multicast 173 * BDG_LOCAL is for a local address 174 * BDG_DROP must be dropped 175 * other ifp of the dest. interface (incl.self) 176 * 177 * We assume this is only called for interfaces for which bridging 178 * is enabled, i.e. BDG_USED(ifp) is true. 179 */ 180static __inline 181struct ifnet * 182bridge_dst_lookup(struct ether_header *eh) 183{ 184 struct ifnet *dst ; 185 int index ; 186 bdg_addr *p ; 187 188 if (IS_ETHER_BROADCAST(eh->ether_dhost)) 189 return BDG_BCAST ; 190 if (eh->ether_dhost[0] & 1) 191 return BDG_MCAST ; 192 /* 193 * Lookup local addresses in case one matches. 194 */ 195 for (index = bdg_ports, p = bdg_addresses ; index ; index--, p++ ) 196 if (BDG_MATCH(p->etheraddr, eh->ether_dhost) ) 197 return BDG_LOCAL ; 198 /* 199 * Look for a possible destination in table 200 */ 201 index= HASH_FN( eh->ether_dhost ); 202 dst = bdg_table[index].name; 203 if ( dst && BDG_MATCH( bdg_table[index].etheraddr, eh->ether_dhost) ) 204 return dst ; 205 else 206 return BDG_UNKNOWN ; 207} 208 209#endif /* KERNEL */ 210 211#endif /* _NET_BRIDGE_H_ */ 212