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Annotation of XNU/bsd/net/bridge.h, revision 1.1

1.1     ! root        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: 
        !            50: extern int do_bridge;
        !            51: /*
        !            52:  * the hash table for bridge
        !            53:  */
        !            54: typedef struct hash_table {
        !            55:     struct ifnet *name ;
        !            56:     unsigned char etheraddr[6] ;
        !            57:     unsigned short used ;
        !            58: } bdg_hash_table ;
        !            59: 
        !            60: extern bdg_hash_table *bdg_table ;
        !            61: 
        !            62: #define BDG_MAX_PORTS 128
        !            63: extern unsigned char bdg_addresses[6*BDG_MAX_PORTS];
        !            64: extern int bdg_ports ;
        !            65: 
        !            66: /*
        !            67:  * out of the 6 bytes, the last ones are more "variable". Since
        !            68:  * we are on a little endian machine, we have to do some gimmick...
        !            69:  */
        !            70: #define HASH_SIZE 8192 /* must be a power of 2 */
        !            71: #define HASH_FN(addr)   (      \
        !            72:        ntohs( ((short *)addr)[1] ^ ((short *)addr)[2] ) & (HASH_SIZE -1))
        !            73: 
        !            74: #define        IFF_MUTE        IFF_LINK2       /* will need a separate flag... */
        !            75: 
        !            76: struct ifnet *bridge_in(struct mbuf *m);
        !            77: /* bdg_forward frees the mbuf if necessary, returning null */
        !            78: int bdg_forward (struct mbuf **m, struct ifnet *dst);
        !            79: 
        !            80: #ifdef __i386__
        !            81: #define BDG_MATCH(a,b) ( \
        !            82:     ((unsigned short *)(a))[2] == ((unsigned short *)(b))[2] && \
        !            83:     *((unsigned int *)(a)) == *((unsigned int *)(b)) )
        !            84: #define IS_ETHER_BROADCAST(a) ( \
        !            85:        *((unsigned int *)(a)) == 0xffffffff && \
        !            86:        ((unsigned short *)(a))[2] == 0xffff )
        !            87: #else
        !            88: #warning... must complete these for the alpha etc.
        !            89: #define BDG_MATCH(a,b) (!bcmp(a, b, ETHER_ADDR_LEN) )
        !            90: #endif
        !            91: /*
        !            92:  * The following constants are not legal ifnet pointers, and are used
        !            93:  * as return values from the classifier, bridge_dst_lookup()
        !            94:  * The same values are used as index in the statistics arrays,
        !            95:  * with BDG_FORWARD replacing specifically forwarded packets.
        !            96:  */
        !            97: #define BDG_BCAST      ( (struct ifnet *)1 )
        !            98: #define BDG_MCAST      ( (struct ifnet *)2 )
        !            99: #define BDG_LOCAL      ( (struct ifnet *)3 )
        !           100: #define BDG_DROP       ( (struct ifnet *)4 )
        !           101: #define BDG_UNKNOWN    ( (struct ifnet *)5 )
        !           102: #define BDG_IN         ( (struct ifnet *)7 )
        !           103: #define BDG_OUT                ( (struct ifnet *)8 )
        !           104: #define BDG_FORWARD    ( (struct ifnet *)9 )
        !           105: 
        !           106: #define PF_BDG 3 /* XXX superhack */
        !           107: /*
        !           108:  * statistics, passed up with sysctl interface and ns -p bdg
        !           109:  */
        !           110: 
        !           111: #define STAT_MAX (int)BDG_FORWARD
        !           112: struct bdg_port_stat {
        !           113:     char name[16];
        !           114:     u_long collisions;
        !           115:     u_long p_in[STAT_MAX+1];
        !           116: } ;
        !           117: 
        !           118: struct bdg_stats {
        !           119:     struct bdg_port_stat s[16];
        !           120: } ;
        !           121: 
        !           122: 
        !           123: #define BDG_STAT(ifp, type) bdg_stats.s[ifp->if_index].p_in[(int)type]++ 
        !           124:  
        !           125: #if KERNEL
        !           126: /*
        !           127:  * Find the right pkt destination:
        !           128:  *     BDG_BCAST       is a broadcast
        !           129:  *     BDG_MCAST       is a multicast
        !           130:  *     BDG_LOCAL       is for a local address
        !           131:  *     BDG_DROP        must be dropped
        !           132:  *     other           ifp of the dest. interface (incl.self)
        !           133:  */
        !           134: static __inline
        !           135: struct ifnet *
        !           136: bridge_dst_lookup(struct mbuf *m)
        !           137: {
        !           138:     struct ether_header *eh = mtod(m, struct ether_header *);
        !           139:     struct ifnet *dst ;
        !           140:     int index ;
        !           141:     u_char *eth_addr = bdg_addresses ;
        !           142: 
        !           143:     if (IS_ETHER_BROADCAST(eh->ether_dhost))
        !           144:        return BDG_BCAST ;
        !           145:     if (eh->ether_dhost[0] & 1)
        !           146:        return BDG_MCAST ;
        !           147:     /*
        !           148:      * Lookup local addresses in case one matches.
        !           149:      */
        !           150:     for (index = bdg_ports, eth_addr = bdg_addresses ;
        !           151:                 index ; index--, eth_addr += 6 )
        !           152:        if (BDG_MATCH(eth_addr, eh->ether_dhost) )
        !           153:            return BDG_LOCAL ;
        !           154:     /*
        !           155:      * Look for a possible destination in table
        !           156:      */
        !           157:     index= HASH_FN( eh->ether_dhost );
        !           158:     dst = bdg_table[index].name;
        !           159:     if ( dst && BDG_MATCH( bdg_table[index].etheraddr, eh->ether_dhost) )
        !           160:        return dst ;
        !           161:     else
        !           162:        return BDG_UNKNOWN ;
        !           163: }
        !           164: 
        !           165: #endif /* KERNEL */
        !           166: 
        !           167: #endif /* ! _NET_BRIDGE_H_ */
        !           168: 

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