ppp: add delegate option support

Ipv6 delegate option is not respected by proto of ppp/pptp/pppoe/pppoa
this add support for them.

Signed-off-by: Chen Minqiang <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/15508
Signed-off-by: Hauke Mehrtens <[email protected]>

package/network/services/ppp/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 include $(INCLUDE_DIR)/kernel.mk
 
 PKG_NAME:=ppp
-PKG_RELEASE:=5
+PKG_RELEASE:=6
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=https://github.com/paulusmack/ppp

package/network/services/ppp/files/lib/netifd/ppp6-up

@@ -28,6 +28,7 @@ if [ -n "$AUTOIPV6" ]; then
 	[ -n "$IP6TABLE" ] && json_add_string ip6table $IP6TABLE
 	[ -n "$PEERDNS" ] && json_add_boolean peerdns $PEERDNS
 	[ "$NOSOURCEFILTER" = "1" ] && json_add_boolean sourcefilter "0"
+	[ "$DELEGATE" = "0" ] && json_add_boolean delegate "0"
 	json_close_object
 	ubus call network add_dynamic "$(json_dump)"
 fi

package/network/services/ppp/files/ppp.sh

@@ -83,13 +83,14 @@ ppp_generic_init_config() {
 	proto_config_add_int maxfail
 	proto_config_add_int holdoff
 	proto_config_add_boolean sourcefilter
+	proto_config_add_boolean delegate
 }
 
 ppp_generic_setup() {
 	local config="$1"; shift
 	local localip
 
-	json_get_vars ip6table demand keepalive keepalive_adaptive username password pppd_options pppname unnumbered persist maxfail holdoff peerdns sourcefilter
+	json_get_vars ip6table demand keepalive keepalive_adaptive username password pppd_options pppname unnumbered persist maxfail holdoff peerdns sourcefilter delegate
 
 	[ ! -e /proc/sys/net/ipv6 ] && ipv6=0 || json_get_var ipv6 ipv6
 
@@ -135,6 +136,7 @@ ppp_generic_setup() {
 	[ -n "$connect" ] || json_get_var connect connect
 	[ -n "$disconnect" ] || json_get_var disconnect disconnect
 	[ "$sourcefilter" = "0" ] || sourcefilter=""
+	[ "$delegate" != "0" ] && delegate=""
 
 	proto_run_command "$config" /usr/sbin/pppd \
 		nodetach ipparam "$config" \
@@ -146,6 +148,7 @@ ppp_generic_setup() {
 		${ip6table:+set IP6TABLE=$ip6table} \
 		${peerdns:+set PEERDNS=$peerdns} \
 		${sourcefilter:+set NOSOURCEFILTER=1} \
+		${delegate:+set DELEGATE=0} \
 		nodefaultroute \
 		usepeerdns \
 		$demand $persist maxfail $maxfail \