feature: support marking packet on upstream server

package/luci-compat/files/luci/i18n/smartdns.zh-cn.po

@@ -230,6 +230,12 @@ msgstr "下载的文件列表。"
 msgid "Local Port"
 msgstr "本地端口"
 
+msgid "Marking Packets"
+msgstr "数据包标记"
+
+msgid "Set mark on packets."
+msgstr "设置数据包标记。"
+
 msgid "Maximum TTL for all domain result."
 msgstr "所有域名的最大 TTL 值。"
 

package/luci-compat/files/luci/model/cbi/smartdns/upstream.lua

@@ -127,6 +127,12 @@ o.rempty      = true
 o:depends("type", "tls")
 o:depends("type", "https")
 
+---- mark
+o = s:option(Value, "set_mark", translate("Marking Packets"), translate("Set mark on packets."))
+o.default     = ""
+o.rempty      = true
+o.datatype    = "uinteger"
+
 ---- other args
 o = s:option(Value, "addition_arg", translate("Additional Server Args"), translate("Additional Args for upstream dns servers"))
 o.default     = ""