1#!/bin/sh 2# $FreeBSD$ 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. 18# 19# 4. Examine bridging statistics by running this script with "stats" 20# as the command line argument. 21# 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# If you just want a normal bridge, just one will be enough. 31# In some cases you may want some combination. 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 assign it the empty 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 echo -n "Loading ${KLD}.ko... " 78 kldload ${KLD} || exit 1 79 echo "done" 80 fi 81 done 82 83 # Reset all interfaces. 84 bridge_stop 85 86 # Verify all interfaces exist. 87 for ETHER in ${BRIDGE_IFACES} ${LOCAL_IFACES}; do 88 if ! ngctl info ${ETHER}: >/dev/null 2>&1; then 89 echo "Error: interface ${ETHER} does not exist" 90 exit 1 91 fi 92 ifconfig ${ETHER} up || exit 1 93 done 94 95 # Create new ng_bridge(4) node, attached to the first interface. 96 FIRSTIF=`echo ${BRIDGE_IFACES} | awk '{ print $1 }'` 97 ngctl mkpeer ${FIRSTIF}: bridge lower link0 || exit 1 98 ngctl name ${FIRSTIF}:lower ${BRIDGE_NAME} || exit 1 99 100 # Attach other interfaces as well. 101 LINKNUM=0 102 for ETHER in ${BRIDGE_IFACES}; do 103 if [ ${LINKNUM} != 0 ]; then 104 ngctl connect ${ETHER}: ${BRIDGE_NAME}: \ 105 lower link${LINKNUM} || exit 1 106 fi 107 LINKNUM=`expr ${LINKNUM} + 1` 108 done 109 110 # Hook up local interface, if any. 111 for LOCAL_IFACE in ${LOCAL_IFACES}; do 112 ngctl connect ${LOCAL_IFACE}: ${BRIDGE_NAME}: \ 113 upper link${LINKNUM} || exit 1 114 LINKNUM=`expr ${LINKNUM} + 1` 115 done 116 117 # Set all interfaces in promiscuous mode and don't overwrite src addr. 118 for ETHER in ${BRIDGE_IFACES}; do 119 ngctl msg ${ETHER}: setpromisc 1 || exit 1 120 ngctl msg ${ETHER}: setautosrc 0 || exit 1 121 done 122} 123 124# Stop routine. 125bridge_stop() { 126 ngctl kill ${BRIDGE_NAME}: >/dev/null 2>&1 127 for ETHER in ${BRIDGE_IFACES} ${LOCAL_IFACES}; do 128 ngctl kill ${ETHER}: >/dev/null 2>&1 129 done 130} 131 132# Stats routine. 133bridge_stats() { 134 135 # Make sure node exists. 136 bridge_verify 137 138 echo "" 139 echo "Statistics for bridging network ${BRIDGE_NAME}:" 140 echo "" 141 LINKNUM=0 142 for ETHER in ${BRIDGE_IFACES}; do 143 echo "Network interface ${ETHER}:" 144 bridge_linkstats ${LINKNUM} 145 LINKNUM=`expr ${LINKNUM} + 1` 146 done 147 for LOCAL_IFACE in ${LOCAL_IFACES}; do 148 echo "Local host interface ${LOCAL_IFACE}:" 149 bridge_linkstats ${LINKNUM} 150 LINKNUM=`expr ${LINKNUM} + 1` 151 done 152} 153 154# Main entry point. 155case $1 in 156 start) 157 bridge_start 158 ;; 159 stats) 160 bridge_verify 161 bridge_stats 162 ;; 163 stop) 164 bridge_verify 165 bridge_stop 166 ;; 167 *) 168 echo "usage: $0 [ start | stop | stats ]" 169 exit 1 170esac 171