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fix: iptables for NAT (#278)

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Kroese 2023-12-28 21:25:46 +01:00 committed by GitHub
parent 2e1a1d644d
commit 63c60d129c
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1 changed files with 23 additions and 24 deletions
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47
src/network.sh
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@ -93,6 +93,26 @@ configureDNS() {
configureNAT() {
# Create the necessary file structure for /dev/net/tun
if [ ! -c /dev/net/tun ]; then
[ ! -d /dev/net ] && mkdir -m 755 /dev/net
if mknod /dev/net/tun c 10 200; then
chmod 666 /dev/net/tun
fi
fi
if [ ! -c /dev/net/tun ]; then
error "TUN device missing. $ADD_ERR --cap-add NET_ADMIN" && exit 25
fi
# Check port forwarding flag
if [[ $(< /proc/sys/net/ipv4/ip_forward) -eq 0 ]]; then
{ sysctl -w net.ipv4.ip_forward=1 ; rc=$?; } || :
if (( rc != 0 )); then
error "IP forwarding is disabled. $ADD_ERR --sysctl net.ipv4.ip_forward=1" && exit 24
fi
fi
# Create a bridge with a static IP for the VM guest
VM_NET_IP='20.20.20.21'
@ -131,6 +151,9 @@ configureNAT() {
done
# Add internet connection to the VM
update-alternatives --set iptables /usr/sbin/iptables-legacy > /dev/null
update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy > /dev/null
iptables -t nat -A POSTROUTING -o "$VM_NET_DEV" -j MASQUERADE
# shellcheck disable=SC2086
iptables -t nat -A PREROUTING -i "$VM_NET_DEV" -d "$IP" -p tcp $CONTROL_PORT_ARGS -j DNAT --to "$VM_NET_IP"
@ -144,14 +167,6 @@ configureNAT() {
{ set +x; } 2>/dev/null
[[ "$DEBUG" == [Yy1]* ]] && echo
# Check port forwarding flag
if [[ $(< /proc/sys/net/ipv4/ip_forward) -eq 0 ]]; then
{ sysctl -w net.ipv4.ip_forward=1 ; rc=$?; } || :
if (( rc != 0 )); then
error "IP forwarding is disabled. $ADD_ERR --sysctl net.ipv4.ip_forward=1" && exit 24
fi
fi
NET_OPTS="-netdev tap,ifname=$VM_NET_TAP,script=no,downscript=no,id=hostnet0"
{ exec 40>>/dev/vhost-net; rc=$?; } 2>/dev/null || :
@ -224,28 +239,12 @@ getInfo() {
# Configure Network
# ######################################
# Create the necessary file structure for /dev/net/tun
if [ ! -c /dev/net/tun ]; then
[ ! -d /dev/net ] && mkdir -m 755 /dev/net
if mknod /dev/net/tun c 10 200; then
chmod 666 /dev/net/tun
fi
fi
if [ ! -c /dev/net/tun ]; then
error "TUN device missing. $ADD_ERR --cap-add NET_ADMIN" && exit 25
fi
# Create the necessary file structure for /dev/vhost-net
if [ ! -c /dev/vhost-net ]; then
if mknod /dev/vhost-net c 10 238; then
chmod 660 /dev/vhost-net
fi
fi
update-alternatives --set iptables /usr/sbin/iptables-legacy > /dev/null
update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy > /dev/null
getInfo
if [[ "$DHCP" == [Yy1]* ]]; then