mwan3: reduce dependency on src_ip

Interfaces may be managed by 3rd-party scripts, thus src_ip may not be
always available in uci.

Signed-off-by: David Yang <mmyangfl@gmail.com>

net/mwan3/files/etc/hotplug.d/iface/15-mwan3

@@ -30,6 +30,7 @@ if [ "$ACTION" == "ifup" ]; then
 		else
 			network_get_ipaddr src_ip ${INTERFACE}
 		fi
+		[ -n "$src_ip" ] || src_ip="0.0.0.0"
 	elif [ "$family" = "ipv6" ]; then
 		ubus call network.interface.${INTERFACE}_6 status &>/dev/null
 		if [ "$?" -eq "0" ]; then
@@ -37,9 +38,8 @@ if [ "$ACTION" == "ifup" ]; then
 		else
 			network_get_ipaddr6 src_ip ${INTERFACE}
 		fi
+		[ -n "$src_ip" ] || src_ip="::"
 	fi
-
-	[ -n "$src_ip" ] || exit 9
 fi
 
 if [ "$initial_state" = "offline" ]; then

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

@@ -195,7 +195,7 @@ mwan3_set_general_iptables()
 
 mwan3_create_iface_iptables()
 {
-	local id family src_ip src_ipv6
+	local id family
 
 	config_get family $1 family ipv4
 	mwan3_get_iface_id id $1
@@ -203,12 +203,6 @@ mwan3_create_iface_iptables()
 	[ -n "$id" ] || return 0
 
 	if [ "$family" == "ipv4" ]; then
-		if ubus call network.interface.${1}_4 status &>/dev/null; then
-			network_get_ipaddr src_ip ${1}_4
-		else
-			network_get_ipaddr src_ip $1
-		fi
-
 		$IPS -! create mwan3_connected list:set
 
 		if ! $IPT4 -S mwan3_ifaces_in &> /dev/null; then
@@ -235,19 +229,13 @@ mwan3_create_iface_iptables()
 		$IPT4 -A mwan3_ifaces_in -m mark --mark 0x0/$MMX_MASK -j mwan3_iface_in_$1
 
 		$IPT4 -F mwan3_iface_out_$1
-		$IPT4 -A mwan3_iface_out_$1 -s $src_ip -m mark --mark 0x0/$MMX_MASK -m comment --comment "$1" -j MARK --set-xmark $(mwan3_id2mask id MMX_MASK)/$MMX_MASK
+		$IPT4 -A mwan3_iface_out_$1 -o $2 -m mark --mark 0x0/$MMX_MASK -m comment --comment "$1" -j MARK --set-xmark $(mwan3_id2mask id MMX_MASK)/$MMX_MASK
 
 		$IPT4 -D mwan3_ifaces_out -m mark --mark 0x0/$MMX_MASK -j mwan3_iface_out_$1 &> /dev/null
 		$IPT4 -A mwan3_ifaces_out -m mark --mark 0x0/$MMX_MASK -j mwan3_iface_out_$1
 	fi
 
 	if [ "$family" == "ipv6" ]; then
-		if ubus call network.interface.${1}_6 status &>/dev/null; then
-			network_get_ipaddr6 src_ipv6 ${1}_6
-		else
-			network_get_ipaddr6 src_ipv6 $1
-		fi
-
 		$IPS -! create mwan3_connected_v6 hash:net family inet6
 
 		if ! $IPT6 -S mwan3_ifaces_in &> /dev/null; then
@@ -274,7 +262,7 @@ mwan3_create_iface_iptables()
 		$IPT6 -A mwan3_ifaces_in -m mark --mark 0x0/$MMX_MASK -j mwan3_iface_in_$1
 
 		$IPT6 -F mwan3_iface_out_$1
-		$IPT6 -A mwan3_iface_out_$1 -s $src_ipv6 -m mark --mark 0x0/$MMX_MASK -m comment --comment "$1" -j MARK --set-xmark $(mwan3_id2mask id MMX_MASK)/$MMX_MASK
+		$IPT6 -A mwan3_iface_out_$1 -o $2 -m mark --mark 0x0/$MMX_MASK -m comment --comment "$1" -j MARK --set-xmark $(mwan3_id2mask id MMX_MASK)/$MMX_MASK
 
 		$IPT6 -D mwan3_ifaces_out -m mark --mark 0x0/$MMX_MASK -j mwan3_iface_out_$1 &> /dev/null
 		$IPT6 -A mwan3_ifaces_out -m mark --mark 0x0/$MMX_MASK -j mwan3_iface_out_$1

net/mwan3/files/usr/sbin/mwan3track

@@ -34,6 +34,10 @@ validate_track_method() {
 				$LOG warn "Missing httping. Please install httping package."
 				return 1
 			}
+			[ -n "$2" -a "$2" != "0.0.0.0" -a "$2" != "::" ] || {
+				$LOG warn "Cannot determine source IP for the interface which is required by httping."
+				return 1
+			}
 			;;
 		*)
 			$LOG warn "Unsupported tracking method: $track_method"
@@ -59,7 +63,7 @@ main() {
 
 	config_load mwan3
 	config_get track_method $1 track_method ping
-	validate_track_method $track_method || {
+	validate_track_method $track_method $SRC_IP || {
 		$LOG warn "Using ping to track interface $INTERFACE avaliability"
 		track_method=ping
 	}