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1 changed files with 120 additions and 29 deletions
149
run/network.sh
149
run/network.sh
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@ -1,22 +1,87 @@
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#!/usr/bin/env bash
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set -eu
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: ${VM_NET_TAP:=''}
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: ${VM_NET_IP:='20.20.20.21'}
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# Docker environment variabeles
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: ${VM_NET_HOST:='QEMU'}
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: ${VM_NET_MAC:='82:cf:d0:5e:57:66'}
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: ${DHCP:='N'}
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: ${DNS_SERVERS:=''}
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: ${DNSMASQ:='/usr/sbin/dnsmasq'}
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: ${DNSMASQ_OPTS:=''}
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: ${DNSMASQ:='/usr/sbin/dnsmasq'}
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: ${DNSMASQ_CONF_DIR:='/etc/dnsmasq.d'}
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# ######################################
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# Functions
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# ######################################
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# Setup macvtap device to connect later the VM and setup a new macvlan device to connect the host machine to the network
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configureNatNetworks () {
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configureDHCP() {
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# Create /dev/vhost-net
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if [ ! -c /dev/vhost-net ]; then
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mknod /dev/vhost-net c 10 238
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chmod 660 /dev/vhost-net
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fi
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if [ ! -c /dev/vhost-net ]; then
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echo -n "Error: VHOST interface not available. Please add the following "
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echo "docker variable to your container: --device=/dev/vhost-net" && exit 85
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fi
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VM_NET_TAP="_VmMacvtap"
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echo "Info: Retrieving IP via DHCP using MAC ${VM_NET_MAC}..."
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ip l add link eth0 name ${VM_NET_TAP} address ${VM_NET_MAC} type macvtap mode bridge || true
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ip l set ${VM_NET_TAP} up
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ip a flush eth0
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ip a flush ${VM_NET_TAP}
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DHCP_IP=$( dhclient -v ${VM_NET_TAP} 2>&1 | grep ^bound | cut -d' ' -f3 )
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if [[ "${DHCP_IP}" == [0-9.]* ]]; then
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echo "Info: Retrieved IP ${DHCP_IP} via DHCP"
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else
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echo "ERROR: Cannot retrieve IP from DHCP using MAC ${VM_NET_MAC}" && exit 16
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fi
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ip a flush ${VM_NET_TAP}
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TAP_PATH="/dev/tap$(</sys/class/net/${VM_NET_TAP}/ifindex)"
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# create dev file (there is no udev in container: need to be done manually)
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IFS=: read MAJOR MINOR < <(cat /sys/devices/virtual/net/${VM_NET_TAP}/tap*/dev)
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if (( MAJOR < 1)); then
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echo "ERROR: Cannot find: sys/devices/virtual/net/${VM_NET_TAP}" && exit 18
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fi
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[[ ! -e ${TAP_PATH} ]] && [[ -e /dev0/${TAP_PATH##*/} ]] && ln -s /dev0/${TAP_PATH##*/} ${TAP_PATH}
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if [[ ! -e ${TAP_PATH} ]]; then
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if ! mknod ${TAP_PATH} c $MAJOR $MINOR ; then
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echo "ERROR: Cannot mknod: ${TAP_PATH}" && exit 20
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fi
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fi
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if ! exec 30>>$TAP_PATH; then
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echo -n "ERROR: Please add the following docker variables to your container: "
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echo "--device=/dev/vhost-net --device-cgroup-rule='c ${MAJOR}:* rwm'" && exit 21
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fi
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if ! exec 40>>/dev/vhost-net; then
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echo -n "ERROR: VHOST can not be found. Please add the following docker "
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echo "variable to your container: --device=/dev/vhost-net" && exit 22
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fi
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NET_OPTS="-netdev tap,id=hostnet0,vhost=on,vhostfd=40,fd=30"
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}
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configureNAT () {
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VM_NET_IP='20.20.20.21'
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VM_NET_TAP="_VmNatTap"
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#Create bridge with static IP for the VM guest
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brctl addbr dockerbridge
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@ -32,6 +97,9 @@ configureNatNetworks () {
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iptables -t nat -A PREROUTING -i eth0 -p tcp -j DNAT --to $VM_NET_IP
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iptables -t nat -A PREROUTING -i eth0 -p udp -j DNAT --to $VM_NET_IP
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# Hack for guest VMs complaining about "bad udp checksums in 5 packets"
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iptables -A POSTROUTING -t mangle -p udp --dport bootpc -j CHECKSUM --checksum-fill
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#Enable port forwarding flag
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[[ $(< /proc/sys/net/ipv4/ip_forward) -eq 0 ]] && sysctl -w net.ipv4.ip_forward=1
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@ -41,6 +109,33 @@ configureNatNetworks () {
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# Create lease file for faster resolve
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echo "0 $VM_NET_MAC $VM_NET_IP $VM_NET_HOST 01:${VM_NET_MAC}" > /var/lib/misc/dnsmasq.leases
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chmod 644 /var/lib/misc/dnsmasq.leases
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NET_OPTS="-netdev tap,ifname=${VM_NET_TAP},script=no,downscript=no,id=hostnet0"
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# Build DNS options from container /etc/resolv.conf
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nameservers=($(grep '^nameserver' /etc/resolv.conf | sed 's/nameserver //'))
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searchdomains=$(grep '^search' /etc/resolv.conf | sed 's/search //' | sed 's/ /,/g')
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domainname=$(echo $searchdomains | awk -F"," '{print $1}')
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for nameserver in "${nameservers[@]}"; do
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if ! [[ $nameserver =~ .*:.* ]]; then
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[[ -z $DNS_SERVERS ]] && DNS_SERVERS=$nameserver || DNS_SERVERS="$DNS_SERVERS,$nameserver"
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fi
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done
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[[ -z $DNS_SERVERS ]] && DNS_SERVERS="1.1.1.1"
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DNSMASQ_OPTS="$DNSMASQ_OPTS --dhcp-option=option:dns-server,$DNS_SERVERS --dhcp-option=option:router,${VM_NET_IP%.*}.1"
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if [ -n "$searchdomains" -a "$searchdomains" != "." ]; then
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DNSMASQ_OPTS="$DNSMASQ_OPTS --dhcp-option=option:domain-search,$searchdomains --dhcp-option=option:domain-name,$domainname"
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else
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[[ -z $(hostname -d) ]] || DNSMASQ_OPTS="$DNSMASQ_OPTS --dhcp-option=option:domain-name,$(hostname -d)"
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fi
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[ "$DEBUG" = "Y" ] && echo && echo "$DNSMASQ $DNSMASQ_OPTS"
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$DNSMASQ $DNSMASQ_OPTS
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}
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# ######################################
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@ -59,34 +154,30 @@ fi
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update-alternatives --set iptables /usr/sbin/iptables-legacy > /dev/null
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update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy > /dev/null
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VM_NET_TAP="_VmNatTap"
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configureNatNetworks
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KVM_NET_OPTS="-netdev tap,ifname=${VM_NET_TAP},script=no,downscript=no,id=hostnet0"
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GATEWAY=$(ip r | grep default | awk '{print $3}')
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# Build DNS options from container /etc/resolv.conf
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nameservers=($(grep '^nameserver' /etc/resolv.conf | sed 's/nameserver //'))
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searchdomains=$(grep '^search' /etc/resolv.conf | sed 's/search //' | sed 's/ /,/g')
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domainname=$(echo $searchdomains | awk -F"," '{print $1}')
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if [ "$DEBUG" = "Y" ]; then
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for nameserver in "${nameservers[@]}"; do
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if ! [[ $nameserver =~ .*:.* ]]; then
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[[ -z $DNS_SERVERS ]] && DNS_SERVERS=$nameserver || DNS_SERVERS="$DNS_SERVERS,$nameserver"
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fi
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done
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IP=$(ip address show dev eth0 | grep inet | awk '/inet / { print $2 }' | cut -f1 -d/)
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echo "Info: Container IP is ${IP} with gateway ${GATEWAY}"
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[[ -z $DNS_SERVERS ]] && DNS_SERVERS="1.1.1.1"
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DNSMASQ_OPTS="$DNSMASQ_OPTS --dhcp-option=option:dns-server,$DNS_SERVERS --dhcp-option=option:router,${VM_NET_IP%.*}.1"
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if [ -n "$searchdomains" -a "$searchdomains" != "." ]; then
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DNSMASQ_OPTS="$DNSMASQ_OPTS --dhcp-option=option:domain-search,$searchdomains --dhcp-option=option:domain-name,$domainname"
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else
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[[ -z $(hostname -d) ]] || DNSMASQ_OPTS="$DNSMASQ_OPTS --dhcp-option=option:domain-name,$(hostname -d)"
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fi
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$DNSMASQ $DNSMASQ_OPTS
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if [ "$DHCP" != "Y" ]; then
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KVM_NET_OPTS="${KVM_NET_OPTS} -device virtio-net-pci,romfile=,netdev=hostnet0,mac=${VM_NET_MAC},id=net0"
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# Configuration for static IP
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configureNAT
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# Hack for guest VMs complaining about "bad udp checksums in 5 packets"
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iptables -A POSTROUTING -t mangle -p udp --dport bootpc -j CHECKSUM --checksum-fill
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else
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if [[ "$GATEWAY" == "172."* ]]; then
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echo -n "ERROR: You cannot enable DHCP while the container is "
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echo "in a bridge network, only on a macvlan network!" && exit 86
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fi
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# Configuration for DHCP IP
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configureDHCP
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fi
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NET_OPTS="${NET_OPTS} -device virtio-net-pci,romfile=,netdev=hostnet0,mac=${VM_NET_MAC},id=net0"
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