mwan3: fix linkdown routes not being added

Signed-off-by: Aaron Goodman <aaronjg@stanford.edu>

net/mwan3/files/lib/mwan3/common.sh

@@ -129,6 +129,9 @@ mwan3_init()
 		LOG debug "Max interface count is ${MWAN3_INTERFACE_MAX}"
 	fi
 
+	# remove "linkdown", expiry and source based routing modifiers from route lines
+	MWAN3_ROUTE_LINE_EXP="s/linkdown //; s/expires [0-9]\+sec//;s/error [0-9]\+//; ${source_routing:+s/default\(.*\) from [^ ]*/default\1/;} p"
+
 	# mark mask constants
 	bitcnt=$(mwan3_count_one_bits MMX_MASK)
 	mmdefault=$(((1<<bitcnt)-1))

net/mwan3/files/lib/mwan3/mwan3.sh

@@ -413,7 +413,7 @@ mwan3_get_routes()
 	local source_routing
 	config_get_bool source_routing globals source_routing 0
 	[ $source_routing -eq 0 ] && unset source_routing
-	$IP route list table main | sed -ne "/^linkdown/T; s/expires \([0-9]\+\)sec//;s/error [0-9]\+//; ${source_routing:+s/default\(.*\) from [^ ]*/default\1/;} p" | uniq
+	$IP route list table main | sed -ne "$MWAN3_ROUTE_LINE_EXP" | uniq
 }
 
 mwan3_create_iface_route()