network: skip already enslaved interfaces

modules.d/35network-legacy/ifup.sh

@@ -408,7 +408,11 @@ for p in $(getargs ip=); do
     esac
 
     # If this option isn't directed at our interface, skip it
-    [ -n "$dev" ] && [ "$dev" != "$netif" ] && continue
+    if [ -n "$dev" ]; then
+        [ "$dev" != "$netif" ] && continue
+    else
+        iface_is_enslaved "$netif" && continue
+    fi
 
     # Store config for later use
     for i in ip srv gw mask hostname macaddr mtu dns1 dns2; do

modules.d/40network/net-lib.sh

@@ -745,6 +745,13 @@ iface_has_link() {
     iface_has_carrier "$@"
 }
 
+iface_is_enslaved() {
+    local _li
+    _li=$(ip -o link show dev $1)
+    strstr "$li" " master " || return 1
+    return 0
+}
+
 find_iface_with_link() {
     local iface_path="" iface=""
     for iface_path in /sys/class/net/*; do