1 files changed, 33 insertions, 0 deletions
diff --git a/target/default/target_skeleton/etc/functions.sh b/target/default/target_skeleton/etc/functions.sh
new file mode 100755
index 000000000..75500a2aa
--- /dev/null
+++ b/target/default/target_skeleton/etc/functions.sh
@@ -0,0 +1,33 @@
+#!/bin/ash
+
+alias debug=${DEBUG:-:}
+
+# allow env to override nvram
+nvram () {
+  case $1 in
+    get) eval "echo \${NVRAM_$2:-\$(command nvram get $2)}";;
+    *) command nvram $*;;
+  esac
+}
+. /etc/nvram.overrides
+
+# valid interface?
+if_valid () {
+  ifconfig "$1" >&- 2>&- ||
+  [ "${1%%[0-9]}" = "br" ] ||
+  {
+    [ "${1%%[0-9]}" = "vlan" ] && ( 
+      i=${1#vlan}
+      hwname=$(nvram get vlan${i}hwname)
+      hwaddr=$(nvram get ${hwname}macaddr)
+      [ -z "$hwaddr" ] && return 1
+
+      vif=$(ifconfig -a | awk '/^eth.*'$hwaddr'/ {print $1; exit}' IGNORECASE=1)
+      debug "# vlan$i => $vif"
+
+      $DEBUG ifconfig $vif up
+      $DEBUG vconfig add $vif $i 2>&-
+    )
+  } ||
+  { echo -e "# $1 ignored: can't find/create"; false; }
+}