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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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