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feat: Improved networking

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Kroese 2024-04-30 00:13:27 +02:00 committed by GitHub
parent c199ff1dfd
commit 5d84121a9e
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GPG Key ID: B5690EEEBB952194
1 changed files with 39 additions and 8 deletions
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47
src/network.sh
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@ -6,6 +6,7 @@ set -Eeuo pipefail
: "${MAC:=""}"
: "${DHCP:="N"}"
: "${NETWORK:="Y"}"
: "${HOST_PORTS:=""}"
: "${VM_NET_DEV:=""}"
: "${VM_NET_TAP:="dsm"}"
@ -35,8 +36,8 @@ configureDHCP() {
{ ip link add link "$VM_NET_DEV" name "$VM_NET_TAP" address "$VM_NET_MAC" type macvtap mode bridge ; rc=$?; } || :
if (( rc != 0 )); then
error "Cannot create macvtap interface. Please make sure the network type is 'macvlan' and not 'ipvlan',"
error "and that the NET_ADMIN capability has been added to the container: --cap-add NET_ADMIN" && exit 16
error "Cannot create macvtap interface. Please make sure that the network type is 'macvlan' and not 'ipvlan',"
error "that your kernel is recent (>4) and supports it, and that the container has the NET_ADMIN capability set." && exit 16
fi
while ! ip link set "$VM_NET_TAP" up; do
@ -103,6 +104,21 @@ configureDNS() {
return 0
}
getPorts() {
local list=$1
[ -z "$list" ] && echo "" && return 0
if [[ "$list" != *","* ]]; then
echo " ! --dport $list"
else
echo " -m multiport ! --dports $list"
fi
return 0
}
configureNAT() {
# Create the necessary file structure for /dev/net/tun
@ -125,6 +141,9 @@ configureNAT() {
fi
fi
local tables="The 'ip_tables' kernel module is not loaded. Try this command: sudo modprobe ip_tables iptable_nat"
local tuntap="The 'tun' kernel module is not available. Try this command: 'sudo modprobe tun' or run the container with 'privileged: true'."
# Create a bridge with a static IP for the VM guest
VM_NET_IP='20.20.20.21'
@ -143,7 +162,9 @@ configureNAT() {
done
# QEMU Works with taps, set tap to the bridge created
ip tuntap add dev "$VM_NET_TAP" mode tap
if ! ip tuntap add dev "$VM_NET_TAP" mode tap; then
error "$tuntap" && exit 31
fi
while ! ip link set "$VM_NET_TAP" up promisc on; do
info "Waiting for TAP to become available..."
@ -156,13 +177,19 @@ configureNAT() {
update-alternatives --set iptables /usr/sbin/iptables-legacy > /dev/null
update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy > /dev/null
iptables -t nat -A POSTROUTING -o "$VM_NET_DEV" -j MASQUERADE
iptables -t nat -A PREROUTING -i "$VM_NET_DEV" -d "$IP" -p tcp -j DNAT --to "$VM_NET_IP"
exclude=$(getPorts "$HOST_PORTS")
if ! iptables -t nat -A POSTROUTING -o "$VM_NET_DEV" -j MASQUERADE; then
error "$tables" && exit 30
fi
# shellcheck disable=SC2086
iptables -t nat -A PREROUTING -i "$VM_NET_DEV" -d "$IP" -p tcp${exclude} -j DNAT --to "$VM_NET_IP"
iptables -t nat -A PREROUTING -i "$VM_NET_DEV" -d "$IP" -p udp -j DNAT --to "$VM_NET_IP"
if (( KERNEL > 4 )); then
# 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 || true
iptables -A POSTROUTING -t mangle -p udp --dport bootpc -j CHECKSUM --checksum-fill > /dev/null 2>&1 || true
fi
NET_OPTS="-netdev tap,ifname=$VM_NET_TAP,script=no,downscript=no,id=hostnet0"
@ -273,10 +300,14 @@ if [[ "$DEBUG" == [Yy1]* ]]; then
echo
fi
if [[ "$IP" == "172.17."* ]]; then
warn "your container IP starts with 172.17.* which will cause conflicts when you install the Container Manager package inside DSM!"
fi
if [[ "$DHCP" == [Yy1]* ]]; then
if [[ "$GATEWAY" == "172."* ]] && [[ "$DEBUG" != [Yy1]* ]]; then
error "You can only enable DHCP while the container is on a macvlan network!" && exit 26
if [[ "$GATEWAY" == "172."* ]]; then
warn "your gateway IP starts with 172.* which could be a sign that you are not on a macvlan network (required for DHCP)!"
fi
# Configuration for DHCP IP