feat: set route config

app/tun/config.proto

@@ -20,8 +20,9 @@ message Config {
     uint32 mtu = 2;
     uint32 user_level = 3;
     v2ray.core.net.packetaddr.PacketAddrType packet_encoding = 4;
-    string tag = 6;
-    repeated v2ray.core.app.router.routercommon.CIDR ips = 7;
+    string tag = 5;
+    repeated v2ray.core.app.router.routercommon.CIDR ips = 6;
+    repeated v2ray.core.app.router.routercommon.CIDR routes = 7;
     bool enable_promiscuous_mode = 8;
     bool enable_spoofing = 9;
 }

app/tun/nic.go

@@ -67,3 +67,24 @@ func AddProtocolAddress(id tcpip.NICID, ips []*routercommon.CIDR) StackOption {
 		return nil
 	}
 }
+
+func SetRouteTable(id tcpip.NICID, routes []*routercommon.CIDR) StackOption {
+	return func(s *stack.Stack) error {
+		s.SetRouteTable(func() (table []tcpip.Route) {
+			for _, cidrs := range routes {
+				subnet := tcpip.AddressWithPrefix{
+					Address:   tcpip.AddrFrom4Slice(cidrs.Ip),
+					PrefixLen: int(cidrs.Prefix),
+				}.Subnet()
+				route := tcpip.Route{
+					Destination: subnet,
+					NIC:         id,
+				}
+				table = append(table, route)
+			}
+			return
+		}())
+
+		return nil
+	}
+}

app/tun/stack.go

@@ -34,6 +34,7 @@ func (t *TUN) CreateStack(linkedEndpoint stack.LinkEndpoint) (*stack.Stack, erro
 
 		CreateNIC(nicID, linkedEndpoint),
 		AddProtocolAddress(nicID, t.config.Ips),
+		SetRouteTable(nicID, t.config.Routes),
 		SetPromiscuousMode(nicID, t.config.EnablePromiscuousMode),
 		SetSpoofing(nicID, t.config.EnableSpoofing),
 	}