lantiq: split up dsl_notify.sh into separate notification handlers

This makes it possible to simply add additional notification handlers
by putting new scripts in the /etc/hotplug.d/dsl directory.

the following Environment Variables are used:

(values marked with an * are only available when bonding support is
compiled in)

DSL_NOTIFICATION_TYPE with one of these values:
- DSL_STATUS
- DSL_INTERFACE_STATUS
- DSL_DATARATE_STATUS_US
- DSL_DATARATE_STATUS_DS

DSL_LINE_NUMBER=<0|1> *

If DSL_NOTIFICATION_TYPE == DSL_STATUS, these variables are set:

- DSL_XTU_STATUS=<ADSL|VDSL>
- DSL_TC_LAYER_STATUS=<ATM|EFM>
- DSL_EFM_TC_CONFIG_US=<NORMAL|PRE_EMPTION>
- DSL_EFM_TC_CONFIG_DS=<NORMAL>

If DSL_NOTIFICATION_TYPE == DSL_INTERFACE_STATUS, these variables are
set:

- DSL_INTERFACE_STATUS=<DOWN|READY|HANDSHAKE|TRAINING|UP>
- DSL_BONDING_STATUS=<INACTIVE|ACTIVE> *

If DSL_NOTIFICATION_TYPE == DSL_DATARATE_STATUS_US, these variables are
set:

- DSL_DATARATE_US_BC0=<Upstream data rate in bit/s for Channel 0>
- DSL_DATARATE_US_BC1=<Upstream data rate in bit/s for Channel 1> *

If DSL_NOTIFICATION_TYPE == DSL_DATARATE_STATUS_DS, these variables are
set:

- DSL_DATARATE_DS_BC0=<Downstream data rate in bit/s for Channel 0>
- DSL_DATARATE_DS_BC1=<Downstream data rate in bit/s for Channel 1> *

Signed-off-by: Martin Schiller <ms@dev.tdt.de>

target/linux/lantiq/base-files/etc/hotplug.d/dsl/pppoa.sh

@@ -0,0 +1,37 @@
+#!/bin/sh
+
+[ "$DSL_NOTIFICATION_TYPE" = "DSL_INTERFACE_STATUS" ] || exit 0
+
+. /usr/share/libubox/jshn.sh
+. /lib/functions.sh
+
+include /lib/network
+scan_interfaces
+
+interfaces=`ubus list network.interface.\* | cut -d"." -f3`
+for ifc in $interfaces; do
+
+	json_load "$(ifstatus $ifc)"
+
+	json_get_var proto proto
+	if [ "$proto" != "pppoa" ]; then
+		continue
+	fi
+
+	json_get_var up up
+	config_get_bool auto "$ifc" auto 1
+	if [ "$DSL_INTERFACE_STATUS" = "UP" ]; then
+		if [ "$up" != 1 ] && [ "$auto" = 1 ]; then
+			( sleep 1; ifup "$ifc" ) &
+		fi
+	else
+		if [ "$up" = 1 ] && [ "$auto" = 1 ]; then
+			( sleep 1; ifdown "$ifc" ) &
+		else
+			json_get_var autostart autostart
+			if [ "$up" != 1 ] && [ "$autostart" = 1 ]; then
+				( sleep 1; ifdown "$ifc" ) &
+			fi
+		fi
+	fi
+done