chg: Ensure proper address family when creating TCP server sockets

src/net/tcp_server_socket.cpp

@@ -32,6 +32,10 @@
 namespace rmrf::net {
 
 static auto_fd create_tcp_server_socket(const socketaddr& socket_identifier) {
+    if (auto f = socket_identifier.family(); f != AF_INET6 && f != AF_INET) {
+        throw netio_exception("For now, TCP is only supported over IP(v6).");
+    }
+
     auto_fd socket_fd{socket(socket_identifier.family(), SOCK_STREAM, 0)};
 
     if (!socket_fd.valid()) {