5 # Linux bridge for connecting lan and wan network of guest machines
6 BR_LAN="${BR_LAN:-br-lan}"
7 BR_WAN="${BR_WAN:-br-wan}"
9 # Host network interface providing internet access for guest machines
10 IF_INET="${IF_INET:-eth0}"
12 # qemu-bridge-helper does two things here
14 # - create tap interface
15 # - add the tap interface to bridge
17 # as such it requires CAP_NET_ADMIN to do its job. It will be convenient to
18 # have it as a root setuid program. Be aware of the security risks implied
20 # the helper has an acl list which defaults to deny all bridge. we need to add
21 # $BR_LAN and $BR_WAN to its allow list
23 # # sudo vim /etc/qemu/bridge.conf
27 # Other allowed directives can be 'allow all', 'deny all', 'include xxx', See
28 # qemu-bridge-helper.c of qemu source code for details.
30 # The helper can be provided by package qemu-system-common on debian, or
31 # qemu-kvm-common on rhel
33 HELPER="${HELPER:-/usr/libexec/qemu-bridge-helper}"
35 ### end of global settings
42 # setup bridge for LAN network
43 sudo ip link add dev "$BR_LAN" type bridge
44 sudo ip link set dev "$BR_LAN" up
45 sudo ip addr add 192.168.1.3/24 dev "$BR_LAN"
47 # setup bridge for WAN network
49 # minimal dnsmasq config for configuring guest wan network with dhcp
51 # # sudo apt-get install dnsmasq
52 # # sudo vi /etc/dnsmasq.conf
54 # dhcp-range=192.168.7.50,192.168.7.150,255.255.255.0,30m
56 sudo ip link add dev "$BR_WAN" type bridge
57 sudo ip link set dev "$BR_WAN" up
58 sudo ip addr add 192.168.7.1/24 dev "$BR_WAN"
60 # guest internet access
61 sudo sysctl -w "net.ipv4.ip_forward=1"
62 sudo sysctl -w "net.ipv4.conf.$BR_WAN.proxy_arp=1"
63 while sudo iptables -t nat -D POSTROUTING -o "$IF_INET" -j MASQUERADE 2>/dev/null; do true; done
64 sudo iptables -t nat -A POSTROUTING -o "$IF_INET" -j MASQUERADE
68 ip link show "$BR_LAN" >/dev/null || return 1
69 ip link show "$BR_WAN" >/dev/null || return 1
71 __errmsg "helper $HELPER is not an executable"
77 [ -n "$o_network" ] || return 0
79 __errmsg "please check the script content to see the environment requirement"
83 #do_setup; check_setup; exit $?
87 Usage: $SELF [-h|--help]
89 [<subtarget> [<extra-qemu-options>]]
95 <subtarget> will default to "generic" and must be specified if
96 <extra-qemu-options> are present
98 e.g. <subtarget> for malta can be le, be, le64, be64, le-glibc, le64-glibc, etc
100 <kernel>, <rootfs> can be required or optional arguments to qemu depending on
101 the actual <target> in use. They will default to files under bin/targets/
106 $SELF x86 64 --machine q35,accel=kvm -device virtio-balloon-pci
107 $SELF x86 64 -incoming tcp:0:4444
113 --machine virt,highmem=off \\
114 --kernel bin/targets/armvirt/32/openwrt-armvirt-32-zImage \\
115 --rootfs bin/targets/armvirt/32/openwrt-armvirt-32-root.ext4
120 hexdump -n 3 -e '"52:54:00" 3/1 ":%02x"' /dev/urandom
126 while [ "$#" -gt 0 ]; do
127 # Cmdline options for the script itself SHOULD try to be
128 # prefixed with two dashes to distinguish them from those for
131 # Also note that qemu accepts both --opt and -opt
133 --kernel) o_kernel="$2"; shift 2 ;;
134 --rootfs) o_rootfs="$2"; shift 2 ;;
135 --machine|-machine|-M) o_mach="$2"; shift 2 ;;
136 --network|-n) o_network=1; shift ;;
142 if [ -z "$o_target" ]; then
144 elif [ -z "$o_subtarget" ]; then
154 MAC_LAN="$(rand_mac)"
155 MAC_WAN="$(rand_mac)"
156 [ -n "$o_target" ] || {
160 [ -n "$o_subtarget" ] || o_subtarget="generic"
161 o_bindir="bin/targets/$o_target/$o_subtarget"
164 start_qemu_armvirt() {
165 local kernel="$o_kernel"
166 local rootfs="$o_rootfs"
167 local mach="${o_mach:-virt}"
171 case "${o_subtarget%-*}" in
173 qemu_exe="qemu-system-arm"
175 [ -n "$kernel" ] || kernel="$o_bindir/openwrt-$o_target-${o_subtarget%-*}-zImage-initramfs"
178 qemu_exe="qemu-system-aarch64"
180 [ -n "$kernel" ] || kernel="$o_bindir/openwrt-$o_target-${o_subtarget%-*}-Image-initramfs"
183 __errmsg "target $o_target: unknown subtarget $o_subtarget"
187 [ -z "$rootfs" ] || {
188 if [ ! -f "$rootfs" -a -s "$rootfs.gz" ]; then
192 "-drive" "file=$rootfs,format=raw,if=virtio" \
193 "-append" "root=/dev/vda rootwait" \
197 [ -z "$o_network" ] || {
199 "-netdev" "bridge,id=lan,br=$BR_LAN,helper=$HELPER" \
200 "-device" "virtio-net-pci,id=devlan,netdev=lan,mac=$MAC_LAN" \
201 "-netdev" "bridge,id=wan,br=$BR_WAN,helper=$HELPER" "-device" \
202 "virtio-net-pci,id=devwan,netdev=wan,mac=$MAC_WAN" \
206 "$qemu_exe" -machine "$mach" -cpu "$cpu" -nographic \
215 local rootfs="$o_rootfs"
216 local kernel="$o_kernel"
217 local mach="${o_mach:-malta}"
219 # o_subtarget can be le, be, le64, be64, le-glibc, le64-glibc, etc..
220 is64="$(echo $o_subtarget | grep -o 64)"
221 [ "$(echo "$o_subtarget" | grep -o '^..')" = "le" ] && isel="el"
222 qemu_exe="qemu-system-mips$is64$isel"
224 [ -n "$kernel" ] || kernel="$o_bindir/openwrt-malta-${o_subtarget%-*}-vmlinux-initramfs.elf"
226 [ -z "$rootfs" ] || {
227 if [ ! -f "$rootfs" -a -s "$rootfs.gz" ]; then
231 "-drive" "file=$rootfs,format=raw" \
232 "-append" "root=/dev/sda rootwait" \
236 # NOTE: order of wan, lan -device arguments matters as it will affect which
237 # one will be actually used as the wan, lan network interface inside the
239 [ -z "$o_network" ] || {
241 -netdev bridge,id=wan,br="$BR_WAN,helper=$HELPER" -device pcnet,netdev=wan,mac="$MAC_WAN"
242 -netdev bridge,id=lan,br="$BR_LAN,helper=$HELPER" -device pcnet,netdev=lan,mac="$MAC_LAN"
246 "$qemu_exe" -machine "$mach" -nographic \
253 local kernel="$o_kernel"
254 local rootfs="$o_rootfs"
255 local mach="${o_mach:-pc}"
257 [ -n "$rootfs" ] || {
258 rootfs="$o_bindir/openwrt-$o_target-${o_subtarget%-*}-generic-ext4-combined.img"
259 if [ ! -f "$rootfs" -a -s "$rootfs.gz" ]; then
264 # generic: 32-bit, pentium4 (CONFIG_MPENTIUM4), kvm guest, virtio
265 # legacy: 32-bit, i486 (CONFIG_M486)
266 # 64: 64-bit, kvm guest, virtio
268 case "${o_subtarget%-*}" in
269 legacy) qemu_exe="qemu-system-i386" ;;
270 generic|64) qemu_exe="qemu-system-x86_64" ;;
272 __errmsg "target $o_target: unknown subtarget $o_subtarget"
277 [ -n "$kernel" ] && {
279 "-kernel" "$kernel" \
280 "-append" "root=/dev/vda console=ttyS0 rootwait" \
284 [ -z "$o_network" ] || {
285 case "${o_subtarget%-*}" in
288 -netdev "bridge,id=lan,br=$BR_LAN,helper=$HELPER" -device "e1000,id=devlan,netdev=lan,mac=$MAC_LAN"
289 -netdev "bridge,id=wan,br=$BR_WAN,helper=$HELPER" -device "e1000,id=devwan,netdev=wan,mac=$MAC_WAN"
294 -netdev "bridge,id=lan,br=$BR_LAN,helper=$HELPER" -device "virtio-net-pci,id=devlan,netdev=lan,mac=$MAC_LAN"
295 -netdev "bridge,id=wan,br=$BR_WAN,helper=$HELPER" -device "virtio-net-pci,id=devwan,netdev=wan,mac=$MAC_WAN"
301 case "${o_subtarget%-*}" in
303 # use IDE (PATA) disk instead of AHCI (SATA). Refer to link
304 # [1] for related discussions
306 # To use AHCI interface
308 # -device ich9-ahci,id=ahci \
309 # -device ide-drive,drive=drv0,bus=ahci.0 \
310 # -drive "file=$rootfs,format=raw,id=drv0,if=none" \
312 # [1] https://dev.openwrt.org/ticket/17947
313 "$qemu_exe" -machine "$mach" -nographic \
314 -device ide-drive,drive=drv0 \
315 -drive "file=$rootfs,format=raw,id=drv0,if=none" \
319 "$qemu_exe" -machine "$mach" -nographic \
320 -drive "file=$rootfs,format=raw,if=virtio" \
328 armvirt) start_qemu_armvirt ;;
329 malta) start_qemu_malta ;;
330 x86) start_qemu_x86 ;;
332 __errmsg "target $o_target is not supported yet"