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This commit is contained in:
Kroese 2023-04-21 21:24:24 +02:00 committed by GitHub
parent 0915687138
commit d521cbe70c
1 changed files with 41 additions and 23 deletions
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64
run/network.sh
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@ -3,6 +3,8 @@ set -eu
# Docker environment variabeles
: ${VM_NET_TAP:='qemu'}
: ${VM_NET_DEV:='eth0'}
: ${VM_NET_HOST:='QEMU'}
: ${VM_NET_MAC:='82:cf:d0:5e:57:66'}
@ -18,24 +20,28 @@ set -eu
configureDHCP() {
# Create /dev/vhost-net
if [ ! -c /dev/vhost-net ]; then
mknod /dev/vhost-net c 10 238
chmod 660 /dev/vhost-net
fi
VM_NET_VLAN="vlan"
GATEWAY=$(ip r | grep default | awk '{print $3}')
NETWORK=$(ip -o route | grep "${VM_NET_DEV}" | grep -v default | awk '{print $1}')
IP=$(ip address show dev "${VM_NET_DEV}" | grep inet | awk '/inet / { print $2 }' | cut -f1 -d/)
if [ ! -c /dev/vhost-net ]; then
echo -n "Error: VHOST interface not available. Please add the following "
echo "docker variable to your container: --device=/dev/vhost-net" && exit 85
fi
ip l add link "${VM_NET_DEV}" "${VM_NET_VLAN}" type macvlan mode bridge
ip address add "${IP}" dev "${VM_NET_VLAN}"
ip link set dev "${VM_NET_VLAN}" up
ip route flush dev "${VM_NET_DEV}"
ip route flush dev "${VM_NET_VLAN}"
ip route add "${NETWORK}" dev "${VM_NET_VLAN}" metric 0
ip route add default via "${GATEWAY}"
VM_NET_TAP="qemu"
echo "Info: Retrieving IP via DHCP using MAC ${VM_NET_MAC}..."
ip l add link eth0 name "${VM_NET_TAP}" address "${VM_NET_MAC}" type macvtap mode bridge || true
ip l add link "${VM_NET_DEV}" name "${VM_NET_TAP}" address "${VM_NET_MAC}" type macvtap mode bridge || true
ip l set "${VM_NET_TAP}" up
ip a flush eth0
ip a flush "${VM_NET_DEV}"
ip a flush "${VM_NET_TAP}"
DHCP_IP=$( dhclient -v "${VM_NET_TAP}" 2>&1 | grep ^bound | cut -d' ' -f3 )
@ -48,7 +54,19 @@ configureDHCP() {
ip a flush "${VM_NET_TAP}"
TAP_PATH="/dev/tap$(</sys/class/net/${VM_NET_TAP}/ifindex)"
# Create /dev/vhost-net
if [ ! -c /dev/vhost-net ]; then
mknod /dev/vhost-net c 10 238
chmod 660 /dev/vhost-net
fi
if [ ! -c /dev/vhost-net ]; then
echo -n "Error: VHOST interface not available. Please add the following "
echo "docker variable to your container: --device=/dev/vhost-net" && exit 85
fi
TAP_NR=$(</sys/class/net/"${VM_NET_TAP}"/ifindex)
TAP_PATH="/dev/tap${TAP_NR}"
# Create dev file (there is no udev in container: need to be done manually)
IFS=: read -r MAJOR MINOR < <(cat /sys/devices/virtual/net/"${VM_NET_TAP}"/tap*/dev)
@ -80,25 +98,25 @@ configureDHCP() {
configureNAT () {
VM_NET_TAP="qemu"
VM_NET_IP='20.20.20.21'
#Create bridge with static IP for the VM guest
brctl addbr dockerbridge
ip addr add ${VM_NET_IP%.*}.1/24 broadcast ${VM_NET_IP%.*}.255 dev dockerbridge
ip link set dockerbridge up
#QEMU Works with taps, set tap to the bridge created
ip tuntap add dev ${VM_NET_TAP} mode tap
ip link set ${VM_NET_TAP} up promisc on
brctl addif dockerbridge ${VM_NET_TAP}
ip tuntap add dev "${VM_NET_TAP}" mode tap
ip link set "${VM_NET_TAP}" up promisc on
brctl addif dockerbridge "${VM_NET_TAP}"
#Add internet connection to the VM
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
iptables -t nat -A PREROUTING -i eth0 -p tcp -j DNAT --to $VM_NET_IP
iptables -t nat -A PREROUTING -i eth0 -p udp -j DNAT --to $VM_NET_IP
iptables -t nat -A POSTROUTING -o "${VM_NET_DEV}" -j MASQUERADE
iptables -t nat -A PREROUTING -i "${VM_NET_DEV}" -p tcp -j DNAT --to $VM_NET_IP
iptables -t nat -A PREROUTING -i "${VM_NET_DEV}" -p udp -j DNAT --to $VM_NET_IP
# Hack for guest VMs complaining about "bad udp checksums in 5 packets"
iptables -A POSTROUTING -t mangle -p udp --dport bootpc -j CHECKSUM --checksum-fill
iptables -A POSTROUTING -t mangle -p udp --dport bootpc -j CHECKSUM --checksum-fill || true
#Enable port forwarding flag
[[ $(< /proc/sys/net/ipv4/ip_forward) -eq 0 ]] && sysctl -w net.ipv4.ip_forward=1
@ -135,7 +153,7 @@ configureNAT () {
[ "$DEBUG" = "Y" ] && echo && echo "$DNSMASQ $DNSMASQ_OPTS"
$DNSMASQ ${DNSMASQ_OPTS:+ $DNSMASQ_OPTS}
$DNSMASQ ${DNSMASQ_OPTS:+ $DNSMASQ_OPTS}
}
# ######################################
@ -158,7 +176,7 @@ GATEWAY=$(ip r | grep default | awk '{print $3}')
if [ "$DEBUG" = "Y" ]; then
IP=$(ip address show dev eth0 | grep inet | awk '/inet / { print $2 }' | cut -f1 -d/)
IP=$(ip address show dev "${VM_NET_DEV}" | grep inet | awk '/inet / { print $2 }' | cut -f1 -d/)
echo "Info: Container IP is ${IP} with gateway ${GATEWAY}"
fi