feat: Allow large MTU sizes (#1042)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/hub.yml

@@ -15,7 +15,7 @@ jobs:
     - uses: actions/checkout@v5
     - 
       name: Docker Hub Description
-      uses: peter-evans/dockerhub-description@v4
+      uses: peter-evans/dockerhub-description@v5
       with:
         username: ${{ secrets.DOCKERHUB_USERNAME }}
         password: ${{ secrets.DOCKERHUB_TOKEN }}

src/disk.sh

@@ -507,13 +507,9 @@ addDevice () {
   physical="${physical%% *}"
 
   if [ -n "$physical" ]; then
-    if [[ "$physical" == "512" || "$physical" == "4096" ]]; then
-      if [[ "$physical" == "4096" ]]; then
+    if [[ "$physical" != "512" ]]; then
       sectors=",logical_block_size=$logical,physical_block_size=$physical"
     fi
-    else
-      warn "Unknown physical sector size: $physical for $DISK_DEV"
-    fi
   else
     warn "Failed to determine the sector size for $DISK_DEV"
   fi
@@ -523,7 +519,9 @@ addDevice () {
   return 0
 }
 
-html "Initializing disks..."
+msg="Initializing disks..."
+html "$msg"
+[[ "$DEBUG" == [Yy1]* ]] && echo "$msg"
 
 [ -z "${DISK_OPTS:-}" ] && DISK_OPTS=""
 [ -z "${DISK_TYPE:-}" ] && DISK_TYPE="scsi"

src/display.sh

@@ -18,6 +18,10 @@ if [[ "$GPU" != [Yy1]* || "$CPU_VENDOR" != "GenuineIntel" || "$ARCH" != "amd64"
 
 fi
 
+msg="Configuring display drivers..."
+html "$msg"
+[[ "$DEBUG" == [Yy1]* ]] && echo "$msg"
+
 DISPLAY_OPTS="-display egl-headless,rendernode=$RENDERNODE"
 DISPLAY_OPTS+=" -vga $VGA"
 

src/entry.sh

@@ -6,6 +6,7 @@ set -Eeuo pipefail
 
 cd /run
 
+. start.sh      # Placeholder
 . utils.sh      # Load functions
 . reset.sh      # Initialize system
 . install.sh    # Run installation

src/install.sh

@@ -31,8 +31,9 @@ if [ -n "$URL" ] && [ ! -s "$FILE" ] && [ ! -d "$DIR" ]; then
   BASE=$(basename "$URL" .pat)
   if [ ! -s "$STORAGE/$BASE.system.img" ]; then
     BASE=$(basename "${URL%%\?*}" .pat)
-    : "${BASE//+/ }"; printf -v BASE '%b' "${_//%/\\x}"
-    BASE=$(echo "$BASE" | sed -e 's/[^A-Za-z0-9._-]/_/g')
+    BASE="${BASE//+/ }"
+    printf -v BASE '%b' "${BASE//%/\\x}"
+    BASE="${BASE//[!A-Za-z0-9._-]/_}"
   fi
   if [[ "${URL,,}" != "http"* && "${URL,,}" != "file:"* ]] ; then
     [ ! -s "$STORAGE/$BASE.pat" ] && error "Invalid URL:  $URL" && exit 65
@@ -65,8 +66,9 @@ fi
 
 if [ ! -s "$FILE" ]; then
   BASE=$(basename "${URL%%\?*}" .pat)
-  : "${BASE//+/ }"; printf -v BASE '%b' "${_//%/\\x}"
-  BASE=$(echo "$BASE" | sed -e 's/[^A-Za-z0-9._-]/_/g')
+  BASE="${BASE//+/ }"
+  printf -v BASE '%b' "${BASE//%/\\x}"
+  BASE="${BASE//[!A-Za-z0-9._-]/_}"
 fi
 
 if [[ "$URL" != "file://$STORAGE/$BASE.pat" ]]; then

src/network.sh

@@ -29,6 +29,8 @@ ADD_ERR="Please add the following setting to your container:"
 
 configureDHCP() {
 
+  [[ "$DEBUG" == [Yy1]* ]] && echo "Configuring MACVTAP networking..."
+
   # Create the necessary file structure for /dev/vhost-net
   if [ ! -c /dev/vhost-net ]; then
     if mknod /dev/vhost-net c 10 238; then
@@ -61,7 +63,7 @@ configureDHCP() {
 
   if [[ "$MTU" != "0" && "$MTU" != "1500" ]]; then
     if ! ip link set dev "$VM_NET_TAP" mtu "$MTU"; then
-      warn "Failed to set MTU size.."
+      warn "Failed to set MTU size to $MTU." && MTU="0"
     fi
   fi
 
@@ -105,6 +107,9 @@ configureDHCP() {
 
 configureDNS() {
 
+  local log="/var/log/dnsmasq.log"
+  rm -f "$log"
+
   # Create lease file for faster resolve
   echo "0 $VM_NET_MAC $VM_NET_IP $VM_NET_HOST 01:$VM_NET_MAC" > /var/lib/misc/dnsmasq.leases
   chmod 644 /var/lib/misc/dnsmasq.leases
@@ -123,17 +128,21 @@ configureDNS() {
 
   # Add DNS entry for container
   DNSMASQ_OPTS+=" --address=/host.lan/${VM_NET_IP%.*}.1"
+  DNSMASQ_OPTS+=" --log-facility=$log"
 
   DNSMASQ_OPTS=$(echo "$DNSMASQ_OPTS" | sed 's/\t/ /g' | tr -s ' ' | sed 's/^ *//')
 
-  if [[ "${DEBUG_DNS:-}" == [Yy1]* ]]; then
-   DNSMASQ_OPTS+=" -d"
-   $DNSMASQ ${DNSMASQ_OPTS:+ $DNSMASQ_OPTS} &
-   return 0
-  fi
+  [[ "$DEBUG" == [Yy1]* ]] && echo "Starting Dnsmasq daemon..."
 
   if ! $DNSMASQ ${DNSMASQ_OPTS:+ $DNSMASQ_OPTS}; then
-    error "Failed to start dnsmasq, reason: $?" && return 1
+    local msg="Failed to start Dnsmasq, reason: $?"
+    [ -f "$log" ] && cat "$log"
+    error "$msg"
+    return 1
+  fi
+
+  if [[ "${DEBUG_DNS:-}" == [Yy1]* ]]; then
+    tail -fn +0 "$log" &
   fi
 
   return 0
@@ -175,6 +184,7 @@ getHostPorts() {
 
   local list="$1"
 
+  [ -z "$list" ] && list="$MON_PORT" || list+=",$MON_PORT"
   [ -z "$list" ] && echo "" && return 0
 
   if [[ "$list" != *","* ]]; then
@@ -188,6 +198,8 @@ getHostPorts() {
 
 configureUser() {
 
+  [[ "$DEBUG" == [Yy1]* ]] && echo "Configuring SLIRP networking..."
+
   if [ -z "$IP6" ]; then
     NET_OPTS="-netdev user,id=hostnet0,host=${VM_NET_IP%.*}.1,net=${VM_NET_IP%.*}.0/24,dhcpstart=$VM_NET_IP,hostname=$VM_NET_HOST"
   else
@@ -206,6 +218,8 @@ configureNAT() {
   local tuntap="TUN device is missing. $ADD_ERR --device /dev/net/tun"
   local tables="The 'ip_tables' kernel module is not loaded. Try this command: sudo modprobe ip_tables iptable_nat"
 
+  [[ "$DEBUG" == [Yy1]* ]] && echo "Configuring NAT networking..."
+
   # Create the necessary file structure for /dev/net/tun
   if [ ! -c /dev/net/tun ]; then
     [[ "$PODMAN" == [Yy1]* ]] && return 1
@@ -252,7 +266,7 @@ configureNAT() {
 
   if [[ "$MTU" != "0" && "$MTU" != "1500" ]]; then
     if ! ip link set dev "$VM_NET_TAP" mtu "$MTU"; then
-      warn "Failed to set MTU size.."
+      warn "Failed to set MTU size to $MTU." && MTU="0"
     fi
   fi
 
@@ -393,11 +407,30 @@ getInfo() {
     error "$ADD_ERR -e \"VM_NET_DEV=NAME\" to specify another interface name." && exit 26
   fi
 
-  NIC=$(ethtool -i "$VM_NET_DEV" | grep -m 1 -i 'driver:' | awk '{print $(2)}')
+  local result nic bus
+  result=$(ethtool -i "$VM_NET_DEV")
+  nic=$(grep -m 1 -i 'driver:' <<< "$result" | awk '{print $(2)}')
+  bus=$(grep -m 1 -i 'bus-info:' <<< "$result" | awk '{print $(2)}')
+
+  if [[ "${bus,,}" != "" && "${bus,,}" != "n/a" ]]; then
+    [[ "$DEBUG" == [Yy1]* ]] && info "Detected BUS: $bus"
+    error "This container does not support host mode networking!"
+    exit 29
+  fi
+
+  if [[ "$DHCP" == [Yy1]* ]]; then
+
+    if [[ "${nic,,}" == "ipvlan" ]]; then
+      error "This container does not support IPVLAN networking when DHCP=Y."
+      exit 29
+    fi
+
+    if [[ "${nic,,}" != "macvlan" ]]; then
+      [[ "$DEBUG" == [Yy1]* ]] && info "Detected NIC: $nic"
+      error "The container needs to be in a MACVLAN network when DHCP=Y."
+      exit 29
+    fi
 
-  if [[ "${NIC,,}" != "veth" ]]; then
-    [[ "$DEBUG" == [Yy1]* ]] && info "Detected NIC: $NIC"
-    error "This container does not support host mode networking!" && exit 29
   fi
 
   BASE_IP="${VM_NET_IP%.*}."
@@ -410,10 +443,6 @@ getInfo() {
     MTU=$(cat "/sys/class/net/$VM_NET_DEV/mtu")
   fi
 
-  if [ "$MTU" -gt "1500" ]; then
-    info "MTU size is too large: $MTU, ignoring..." && MTU="0"
-  fi
-
   if [[ "${ADAPTER,,}" != "virtio-net-pci" ]]; then
     if [[ "$MTU" != "0" && "$MTU" != "1500" ]]; then
       warn "MTU size is $MTU, but cannot be set for $ADAPTER adapters!" && MTU="0"
@@ -468,6 +497,8 @@ if [[ "$NETWORK" == [Nn]* ]]; then
   return 0
 fi
 
+[[ "$DEBUG" == [Yy1]* ]] && echo "Retrieving network information..."
+
 getInfo
 html "Initializing network..."
 
@@ -487,6 +518,9 @@ 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
 
+# Clean up old files
+rm -f /var/run/dnsmasq.pid
+
 if [[ -d "/sys/class/net/$VM_NET_TAP" ]]; then
   info "Lingering interface will be removed..."
   ip link delete "$VM_NET_TAP" || true
@@ -496,10 +530,6 @@ if [[ "$DHCP" == [Yy1]* ]]; then
 
   checkOS
 
-  if [[ "$IP" == "172."* ]]; then
-    warn "container IP starts with 172.* which is often a sign that you are not on a macvlan network (required for DHCP)!"
-  fi
-
   # Configure for macvtap interface
   configureDHCP || exit 20
 

src/power.sh

@@ -1,15 +1,15 @@
 #!/usr/bin/env bash
 set -Eeuo pipefail
 
+: "${API_TIMEOUT:="50"}"   # API Call timeout
+: "${QEMU_TIMEOUT:="50"}"  # QEMU Termination timeout
+
 # Configure QEMU for graceful shutdown
 
 API_CMD=6
 API_HOST="127.0.0.1:2210"
-: "${API_TIMEOUT:="50"}" # API Call timeout
 
 QEMU_TERM=""
-QEMU_PORT=7100
-: "${QEMU_TIMEOUT:="50"}" # QEMU Termination timeout
 QEMU_DIR="/run/shm"
 QEMU_PID="$QEMU_DIR/qemu.pid"
 QEMU_LOG="$QEMU_DIR/qemu.log"
@@ -83,7 +83,7 @@ terminal() {
   fi
 
   if [ ! -c "$dev" ]; then
-    dev=$(echo 'info chardev' | nc -q 1 -w 1 localhost "$QEMU_PORT" | tr -d '\000')
+    dev=$(echo 'info chardev' | nc -q 1 -w 1 localhost "$MON_PORT" | tr -d '\000')
     dev="${dev#*serial0}"
     dev="${dev#*pty:}"
     dev="${dev%%$'\n'*}"
@@ -127,7 +127,7 @@ _graceful_shutdown() {
   fi
 
   # Don't send the powerdown signal because vDSM ignores ACPI signals
-  # echo 'system_powerdown' | nc -q 1 -w 1 localhost "${QEMU_PORT}" > /dev/null
+  # echo 'system_powerdown' | nc -q 1 -w 1 localhost "$MON_PORT" > /dev/null
 
   # Send shutdown command to guest agent via serial port
   url="http://$API_HOST/read?command=$API_CMD&timeout=$API_TIMEOUT"
@@ -172,7 +172,7 @@ _graceful_shutdown() {
 MON_OPTS="\
         -pidfile $QEMU_PID \
         -name $PROCESS,process=$PROCESS,debug-threads=on \
-        -monitor telnet:localhost:$QEMU_PORT,server,nowait,nodelay"
+        -monitor telnet:localhost:$MON_PORT,server,nowait,nodelay"
 
 if [[ "$CONSOLE" != [Yy]* ]]; then
 

src/reset.sh

@@ -2,6 +2,7 @@
 set -Eeuo pipefail
 
 trap 'error "Status $? while: $BASH_COMMAND (line $LINENO/$BASH_LINENO)"' ERR
+[[ "${TRACE:-}" == [Yy1]* ]] && set -o functrace && trap 'echo "# $BASH_COMMAND" >&2' DEBUG
 
 [ ! -f "/run/entry.sh" ] && error "Script must run inside Docker container!" && exit 11
 [ "$(id -u)" -ne "0" ] && error "Script must be executed with root privileges." && exit 12
@@ -202,6 +203,7 @@ addPackage() {
   return 0
 }
 
+: "${MON_PORT:="7100"}"    # Monitor port
 : "${WEB_PORT:="5000"}"    # Webserver port
 
 cp -r /var/www/* /run/shm

src/start.sh

@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+set -Eeuo pipefail
+
+# Override this placeholder file using a Docker bind to execute a script during startup!

src/utils.sh

@@ -126,8 +126,8 @@ cpu() {
   cpu="${cpu// [0-9] Core}"
   cpu="${cpu// [0-9][0-9] Core}"
   cpu="${cpu// [0-9][0-9][0-9] Core}"
-  cpu="${cpu// [0-9]th Gen}"
-  cpu="${cpu// [0-9][0-9]th Gen}"
+  cpu="${cpu//[0-9]th Gen }"
+  cpu="${cpu//[0-9][0-9]th Gen }"
   cpu="${cpu// Processor/}"
   cpu="${cpu// Quad core/}"
   cpu="${cpu// Dual core/}"