Add PROXY Protocol support for freedom outbound

infra/conf/freedom.go

@@ -17,6 +17,7 @@ type FreedomConfig struct {
 	Redirect       string    `json:"redirect"`
 	UserLevel      uint32    `json:"userLevel"`
 	Fragment       *Fragment `json:"fragment"`
+	ProxyProtocol  uint32    `json:"proxyProtocol"`
 }
 
 type Fragment struct {
@@ -165,5 +166,8 @@ func (c *FreedomConfig) Build() (proto.Message, error) {
 			config.DestinationOverride.Server.Address = v2net.NewIPOrDomain(v2net.ParseAddress(host))
 		}
 	}
+	if c.ProxyProtocol > 0 && c.ProxyProtocol <= 2 {
+		config.ProxyProtocol = c.ProxyProtocol
+	}
 	return config, nil
 }