gluon-statistics-mcast: adding initial package

This package collects disected statistics on multicast
and management traffic and provides them via respondd in
"statistics-extended". Such information can be helpful
for further development and comparison of mesh routing
protocols and troubleshooting network issues.

The statistics gathered disect into batman-adv
packets as well. Statistics are collected both on client
bridge ports and br-client as well as mesh interfaces.

This introduces a performance penalty but tries to
keep the impact on unicast traffic small.

Note that respondd replies are rather large
(several UDP datagrams, even when LZMA compressed).
Therefore you might want to use slower intervals for
querying respondd "statistics-extended".

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>

package/gluon-statistics-mcast/Makefile

@@ -0,0 +1,33 @@
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=gluon-statistics-mcast
+PKG_VERSION:=1
+
+include ../gluon.mk
+
+define Package/gluon-statistics-mcast
+  TITLE:=Gluon Statistics for Multicast Traffic
+  DEPENDS:= +bpfcountd +libgluonutil
+endef
+
+define Package/gluon-statistics-mcast/description
+	This package collects disected statistics on multicast
+	and management traffic and provides them via respondd in
+	"statistics-extended". Such information can be helpful
+	for further development and comparison of mesh routing
+	protocols and troubleshooting network issues.
+
+	The statistics gathered disect into batman-adv
+	packets as well. Statistics are collected both on client
+	bridge ports and br-client as well as mesh interfaces.
+
+	This introduces a performance penalty but tries to
+	keep the impact on unicast traffic small.
+
+	Note that respondd replies are rather large
+	(several UDP datagrams, even when LZMA compressed).
+	Therefore you might want to use slower intervals for
+	querying respondd "statistics-extended".
+endef
+
+$(eval $(call BuildPackageGluon,gluon-statistics-mcast))

package/gluon-statistics-mcast/files/etc/hotplug.d/iface/40-bpfcountd

@@ -0,0 +1,68 @@
+case "$INTERFACE" in
+  "client"|\
+  "mmfd")
+	;;
+  *)
+	exit 0
+	;;
+esac
+
+BPFCOUNTD_RUN="/var/run/bpfcountd"
+mkdir -p "${BPFCOUNTD_RUN}/gluon-ifaces"
+
+get_ifup_ifaces() {
+	local ifaces="$DEVICE"
+	local brports
+
+	if [ -d "/sys/class/net/$DEVICE/bridge/" ]; then
+		brports="$(ls "/sys/class/net/$DEVICE/brif/")"
+		[ -n "$brports" ] && ifaces="$(echo -e "${brports}\n${ifaces}")"
+	fi
+
+	echo "$ifaces"
+}
+
+get_ifdown_ifaces() {
+	cat "${BPFCOUNTD_RUN}/gluon-ifaces/$INTERFACE"
+}
+
+bpfcountd_start() {
+	local ifaces="$(get_ifup_ifaces)"
+	local iface
+
+	[ -z "$ifaces" ] && return
+	[ -f "${BPFCOUNTD_RUN}/gluon-ifaces/$INTERFACE" ] && return
+	echo "$ifaces" > "${BPFCOUNTD_RUN}/gluon-ifaces/$INTERFACE"
+
+	for iface in $ifaces; do
+		IFNAME="$iface" /lib/gluon/core/mesh/setup.d/40-bpfcountd "clients"
+	done
+}
+
+bpfcountd_stop() {
+	local ifaces="$(get_ifdown_ifaces)"
+	local iface
+
+	[ -z "$ifaces" ] && return
+	rm "${BPFCOUNTD_RUN}/gluon-ifaces/$INTERFACE"
+
+	for iface in $ifaces; do
+		IFNAME="$iface" /lib/gluon/core/mesh/teardown.d/40-bpfcountd
+	done
+}
+
+# synchronize reads+writes to /var/run/gluon-ifaces/$INTERFACE
+lock /var/lock/gluon_bpfcountd_ifaces.lock
+
+case "$ACTION" in
+  "ifup")
+	bpfcountd_start
+	;;
+  "ifdown")
+	bpfcountd_stop
+	;;
+  *)
+	;;
+esac
+
+lock -u /var/lock/gluon_bpfcountd_ifaces.lock