net,dgram: add ipv6Only option for net and dgram

For TCP servers, the dual-stack support is enable by default, i.e.
binding host "::" will also make "0.0.0.0" bound. This commit add
ipv6Only option in `net.Server.listen()` and `dgram.createSocket()`
methods which allows to disable dual-stack support. Support for
cluster module is also provided in this commit.

Fixes: https://github.com/nodejs/node/issues/17664

PR-URL: https://github.com/nodejs/node/pull/23798
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>

1 files changed, 33 insertions, 0 deletions

diff --git a/test/parallel/test-dgram-ipv6only.js b/test/parallel/test-dgram-ipv6only.js
new file mode 100644
index 0000000000..1187f3084a
--- /dev/null
+++ b/test/parallel/test-dgram-ipv6only.js
@@ -0,0 +1,33 @@
+'use strict';
+
+const common = require('../common');
+if (!common.hasIPv6)
+  common.skip('no IPv6 support');
+
+const dgram = require('dgram');
+
+// This test ensures that dual-stack support is disabled when
+// we specify the `ipv6Only` option in `dgram.createSocket()`.
+const socket = dgram.createSocket({
+  type: 'udp6',
+  ipv6Only: true,
+});
+
+socket.bind({
+  port: 0,
+  address: '::',
+}, common.mustCall(() => {
+  const { port } = socket.address();
+  const client = dgram.createSocket('udp4');
+
+  // We can still bind to '0.0.0.0'.
+  client.bind({
+    port,
+    address: '0.0.0.0',
+  }, common.mustCall(() => {
+    client.close();
+    socket.close();
+  }));
+
+  client.on('error', common.mustNotCall());
+}));