1#!/bin/sh
2# $FreeBSD: head/share/examples/netgraph/ether.bridge 95258 2002-04-22 13:44:47Z des $
3# This script sets up an Ethernet bridging network across multiple
4# Ethernet interfaces using the ng_bridge(4) and ng_ether(4) netgraph
5# node types.
6#
7# To use this script:
8#
9# 0. Make your own copy of this example script
10#
11# 1. Give your bridging network a name by editing the definition of
12# ${BRIDGE_NAME} below. It must be a valid netgraph node name.
13#
14# 2. Edit the definitions of ${BRIDGE_IFACES} and ${LOCAL_IFACES}
15# as described below to define your bridging interfaces.
16#
17# 3. Run this script with "start" as the command line argument.

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22# 5. Stop bridging by running this script with "stop" as the
23# command line argument.
24#
25# To run multiple independent bridging networks, create multiple
26# copies of this script with different variable definitions.
27#
28# To make a "brouted" network, with IP being routed and other protocols being
29# bridged, add all the interface in the BRIDGE_IFACES to the LOCAL_IFACES.
30# I you just want a normal bridge, just one will surfice.
31# in some cases you may want some mixture.
32#
33
34# Give each bridging network a unique name here
35
36BRIDGE_NAME="bnet0"
37
38# List the names of the interfaces that you want to bridge across
39# here in ${BRIDGE_IFACES}. If you want to include the local host
40# machine as well then set ${LOCAL_IFACES} as well (they may also be
41# listed in ${BRIDGE_IFACES}). Of course, any ${LOCAL_IFACE} must
42# be ifconfig(8)ured separately. If you don't want a ${LOCAL_IFACE}
43# then leave it defined as the emtpy string.
44
45BRIDGE_IFACES="de0 fxp0 fxp1"
46LOCAL_IFACES="fxp0 fxp1"
47
48####################################################################
49#### Everything below this point should not need to be modified ####
50####################################################################
51
52# Routine to verify node's existence
53bridge_verify() {
54 ngctl info ${BRIDGE_NAME}: >/dev/null 2>&1
55 if [ $? -ne 0 ]; then
56 echo "${BRIDGE_NAME}: bridge network not found"
57 exit 1
58 fi
59}
60
61# Routine to get and display link stats
62bridge_linkstats() {
63 STATS=`ngctl msg ${BRIDGE_NAME}: getstats $1`
64 if [ $? -ne 0 ]; then
65 exit 1
66 fi
67 echo "${STATS}" | fmt 2 | awk '/=/ { fl=index($0, "="); \
68 printf "%20s = %s\n", substr($0, 0, fl - 1), substr($0, fl + 1); }'
69}
70
71# Start/restart routine
72bridge_start() {
73
74 # Load netgraph KLD's as necessary
75 for KLD in ng_ether ng_bridge; do
76 if kldstat -v | grep -qw ${KLD}; then
77 else
78 echo -n "Loading ${KLD}.ko... "
79 kldload ${KLD} || exit 1
80 echo "done"
81 fi
82 done
83
84 # Reset all interfaces
85 bridge_stop
86
87 # Verify all interfaces exist
88 for ETHER in ${BRIDGE_IFACES} ${LOCAL_IFACES}; do
89 if ngctl info ${ETHER}: >/dev/null 2>&1; then
90 else
91 echo "Error: interface ${ETHER} does not exist"
92 exit 1
93 fi
94 ifconfig ${ETHER} up || exit 1
95 done
96
97 # Create new ng_bridge(4) node, attached to the first interface
98 FIRSTIF=`echo ${BRIDGE_IFACES} | awk '{ print $1 }'`
99 ngctl mkpeer ${FIRSTIF}: bridge lower link0 || exit 1
100 ngctl name ${FIRSTIF}:lower ${BRIDGE_NAME} || exit 1
101
102 # Attach other interfaces as well
103 LINKNUM=0
104 for ETHER in ${BRIDGE_IFACES}; do
105 if [ ${LINKNUM} != 0 ]; then
106 ngctl connect ${ETHER}: ${BRIDGE_NAME}: \
107 lower link${LINKNUM} || exit 1
108 fi
109 LINKNUM=`expr ${LINKNUM} + 1`
110 done
111
112 # Hook up local interface, if any
113 for LOCAL_IFACE in ${LOCAL_IFACES}; do
114 ngctl connect ${LOCAL_IFACE}: ${BRIDGE_NAME}: \
115 upper link${LINKNUM} || exit 1
116 LINKNUM=`expr ${LINKNUM} + 1`
117 done
118
119 # Set all interfaces in promiscuous mode and don't overwrite src addr
120 for ETHER in ${BRIDGE_IFACES}; do
121 ngctl msg ${ETHER}: setpromisc 1 || exit 1
122 ngctl msg ${ETHER}: setautosrc 0 || exit 1
123 done
124}
125
126# Stop routine
127bridge_stop() {
128 ngctl kill ${BRIDGE_NAME}: >/dev/null 2>&1
129 for ETHER in ${BRIDGE_IFACES} ${LOCAL_IFACES}; do
130 ngctl kill ${ETHER}: >/dev/null 2>&1
131 done
132}
133
134# Stats routine
135bridge_stats() {
136
137 # Make sure node exists
138 bridge_verify
139
140 echo ""
141 echo "Statistics for bridging network ${BRIDGE_NAME}:"
142 echo ""
143 LINKNUM=0
144 for ETHER in ${BRIDGE_IFACES}; do
145 echo "Network interface ${ETHER}:"
146 bridge_linkstats ${LINKNUM}
147 LINKNUM=`expr ${LINKNUM} + 1`
148 done
149 for LOCAL_IFACE in ${LOCAL_IFACES}; do
150 echo "Local host interface ${LOCAL_IFACE}:"
151 bridge_linkstats ${LINKNUM}
152 LINKNUM=`expr ${LINKNUM} + 1`
153 done
154}
155
156# Main entry point
157case $1 in
158 start)
159 bridge_start
160 ;;
161 stats)
162 bridge_verify
163 bridge_stats
164 ;;
165 stop)
166 bridge_verify
167 bridge_stop
168 ;;
169 *)
170 echo "usage: ether.bridge [ start | stop | stats ]"
171 exit 1
172esac
173