1 files changed, 57 insertions, 0 deletions
diff --git a/package/base-files/default/etc/functions.sh b/package/base-files/default/etc/functions.sh
new file mode 100755
index 000000000..60d6231f8
--- /dev/null
+++ b/package/base-files/default/etc/functions.sh
@@ -0,0 +1,57 @@
+#!/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>&-
+    )
+  } ||
+  { debug "# missing interface '$1' ignored"; false; }
+)
+
+bitcount () {
+  local c=$1
+  echo $((
+  c=((c>> 1)&0x55555555)+(c&0x55555555),
+  c=((c>> 2)&0x33333333)+(c&0x33333333),
+  c=((c>> 4)&0x0f0f0f0f)+(c&0x0f0f0f0f),
+  c=((c>> 8)&0x00ff00ff)+(c&0x00ff00ff),
+  c=((c>>16)&0x0000ffff)+(c&0x0000ffff)
+  ))
+}
+
+valid_netmask () {
+  return $((-($1)&~$1))
+}
+
+ip2int () (
+  set $(echo $1 | tr '\.' ' ')
+  echo $(($1<<24|$2<<16|$3<<8|$4))
+)
+
+int2ip () {
+  echo $(($1>>24&255)).$(($1>>16&255)).$(($1>>8&255)).$(($1&255))
+}