batman-adv: Add support for hardif settings

B.A.T.M.A.N. V support additional settings which are hardif specific. The
batadv_hardif proto has to expose them to allow automatic configuration.
The default configuration would be:

  config interface 'bat0_hardif_eth0'
  	option proto 'batadv_hardif'
  	option master 'bat0'
  	option ifname 'eth0'
  	option mtu '1536'
  	option 'elp_interval' 500
  	# string like '1mbit' is accepted instead of kbit for override
  	option 'throughput_override' '0'

Signed-off-by: Sven Eckelmann <sven@narfation.org>

batman-adv/Makefile

@@ -10,7 +10,7 @@ include $(TOPDIR)/rules.mk
 PKG_NAME:=batman-adv
 
 PKG_VERSION:=2019.2
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 PKG_HASH:=70c3f6a6cf88d2b25681a76768a52ed92d9fe992ba8e358368b6a8088757adc8
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz

batman-adv/files/lib/netifd/proto/batadv_hardif.sh

@@ -7,21 +7,30 @@
 }
 
 proto_batadv_hardif_init_config() {
+	proto_config_add_int 'elp_interval'
 	proto_config_add_string "master"
+	proto_config_add_string 'throughput_override'
 }
 
 proto_batadv_hardif_setup() {
 	local config="$1"
 	local iface="$2"
 
+	local elp_interval
 	local master
+	local throughput_override
 
+	json_get_vars elp_interval
 	json_get_vars master
+	json_get_vars throughput_override
 
 	( proto_add_host_dependency "$config" '' "$master" )
 
 	batctl -m "$master" interface -M add "$iface"
 
+	[ -n "$elp_interval" ] && batctl -m "$master" hardif "$iface" elp_interval "$elp_interval"
+	[ -n "$throughput_override" ] && batctl -m "$master" hardif "$iface" throughput_override "$throughput_override"
+
 	proto_init_update "$iface" 1
 	proto_send_update "$config"
 }