Rene Rebe:

package/base/sysfiles/ifup.sh

@@ -1,20 +1,56 @@
 #!/bin/sh
 
+rocknet_tmp_base="/var/run/rocknet"
+[ -d $rocknet_tmp_base ] || mkdir -p $rocknet_tmp_base
+
+var_contains() {
+  local tmp;
+  eval "tmp=\"\$$1\""
+  
+  [ "${tmp/$3$2/}" != "$tmp" ]
+}
+
 usage() {
-	echo "Usage: $0 interface [ profile ]"
+	echo "Usage: $0 interface [ profile ] [ -force ]"
 	exit 1
 }
 
-[ "$1" ] || usage
+force=0
 
-if [ "$2" = "" ] ; then
-	profile="`cat /etc/network/profile 2> /dev/null`"
-else
-	profile="$2"
-fi
+if="$1" ; shift ; [ "$if" ] || usage
+profile=""
+action="${0/#*\/if}"
+
+while [ "$1" ] ; do
+	case $1 in
+		-force) force=1 ;;
+		*) [ "$profile" = "" ] && profile="$1" || usage ;;
+	esac
+	shift
+done
 
+[ "$profile" ] || profile="`cat /etc/network/profile 2> /dev/null`"
 profile=${profile:-default}
 
-/etc/network/rocknet "$profile" "$1" "${0#/sbin/if}"
+# sanity checks (...)
+
+if [ $force -eq 0 ] ; then
+  active_interfaces="`cat $rocknet_tmp_base/active-interfaces 2>/dev/null`"
+  if test $action = "up" && var_contains active_interfaces ',' "$1($profile)"
+    then
+	echo "Interface $if($profile) is already listed active, it is probably a good idea to"
+	echo "take it down before activating it. Use -force to suppress this warning."
+	exit 2
+  fi
+
+  if test $action = "down" && ! var_contains active_interfaces ',' "$1($profile)"
+    then
+        echo "Interface $if($profile) is not listed active, it is probably a good idea to"
+        echo "activate it before deactivating it. Use -force to suppress this warning."
+        exit 2
+  fi
+fi
+
+/etc/network/rocknet "$profile" "$if" "$action"
 echo "$profile" > /etc/network/profile
 

package/base/sysfiles/rocknet.sh

@@ -13,6 +13,7 @@ code_snipplets_counter=0
 
 lineno=0
 ignore=0
+global=1
 
 if [ "$3" != "up" -a "$3" != "down" ]; then
 	echo "Usage: $0 { profile | default } { interface | auto } { up | down }"
@@ -61,6 +62,20 @@ status() {
 	echo "$*"
 }
 
+#
+# register / unregister active interfaces for user input validation
+#
+
+register() {
+	echo -n "${1}," >> $rocknet_tmp_base/active-interfaces
+}
+
+unregister () {
+	active_interfaces="`cat $rocknet_tmp_base/active-interfaces 2>/dev/null`"
+	active_interfaces="${active_interfaces//${1},/}"
+	echo -n "$active_interfaces" > $rocknet_tmp_base/active-interfaces
+}
+
 for x in "$rocknet_base"/modules/*.sh; do . "$x"; done
 
 while read cmd para
@@ -71,7 +86,14 @@ do
 		para="$( echo "$para" | sed 's,[\*\?],\\&,g' )"
 		if declare -f public_$cmd > /dev/null
 		then
-			public_$cmd $para
+			# optimization: Only execute commands when they are
+			# inside an unignored interface section ...
+			if [ $cmd = "interface" ] ; then
+				public_$cmd $para
+				global=0
+			elif [ $ignore -eq 0 -o $global -gt 0 ] ; then
+				public_$cmd $para
+			fi
 		else
 			error "Unknown statement in config file: $cmd"
 		fi
@@ -88,6 +110,8 @@ done < <(
 	done | sort
 )
 
-[ "$pmatched" = 0 ] && error "Unknown profile: $profile"
-[ "$imatched" = 0 ] && error "Unknown interface for profile: $interface"
+[ "$pmatched" = 0 ] && \
+	error "Unknown profile: '$profile'"
+[ "$pmatched" = 1 -a "$imatched" = 0 ] && \
+	error "Unknown interface for profile: '$interface'"
 

package/base/sysfiles/rocknet_modules_base.sh

@@ -47,6 +47,8 @@ public_interface() {
 	if [ "$ignore" = 0 ] ; then
 		imatched=1
 		status "Interface / profile matched: $if($prof)"
+		addcode up 9 9 "register $if\($prof\)"
+		addcode down 9 9 "unregister $if\($prof\)"
 	fi
 }