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