Support rfkill for mobile_ppp connections

docs/netctl.profile.5.txt

@@ -480,6 +480,11 @@ type:
 'OptionsFile='::
     A file to read additional pppd options from.
 
+'RFKill='::
+    The name of an *rfkill* device. When specified, the device is used
+    to block/unblock the interface when appropriate. Names can be found
+    in '/sys/class/rfkill/rfkillX/name'.
+
 
 OPTIONS FOR `openvswitch' CONNECTIONS
 -------------------------------------

src/lib/connections/mobile_ppp

@@ -2,6 +2,8 @@
 # Based on Thomas Bächler’s <thomas@archlinux.org> pppoe script
 # Also see <https://wiki.archlinux.org/index.php/3G_and_GPRS_modems_with_pppd> for more information.
 
+. "$SUBR_DIR/rfkill"
+
 : ${PPPD:=pppd}
 : ${InterfaceRoot=dev/}
 
@@ -13,6 +15,10 @@ quote_word() {
 mobile_ppp_up() {
     local options_dir="$STATE_DIR/mobile_ppp-$Interface-$Profile"
 
+    if [[ $RFKill ]]; then
+        rf_enable "$Interface" "$RFKill" || return 1
+    fi
+
     network_ready
 
     mkdir -p "$options_dir"
@@ -97,6 +103,9 @@ mobile_ppp_down() {
     fi
 
     rm -r "$options_dir"
+    if [[ $RFKill ]]; then
+        rf_disable "$Interface" "$RFKill"
+    fi
 }