From 754e9aa60a8892cdd6c1d74a822f049f1c71d831 Mon Sep 17 00:00:00 2001
From: Fabio Alessandrelli
Date: Fri, 28 Oct 2016 23:11:53 +0200
Subject: TCP/UDP Listen sockets can now be set to IPv6 only

(cherry picked from commit eb27e993f0f2fb3de48b7b8aa01c74cc1635a178)
---
 drivers/unix/tcp_server_posix.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'drivers/unix/tcp_server_posix.cpp')

diff --git a/drivers/unix/tcp_server_posix.cpp b/drivers/unix/tcp_server_posix.cpp
index 32fda618b..7028c1a10 100644
--- a/drivers/unix/tcp_server_posix.cpp
+++ b/drivers/unix/tcp_server_posix.cpp
@@ -74,6 +74,14 @@ Error TCPServerPosix::listen(uint16_t p_port, IP_Address::AddrType p_type, const
 	sockfd = _socket_create(p_type, SOCK_STREAM, IPPROTO_TCP);
 
 	ERR_FAIL_COND_V(sockfd == -1, FAILED);
+
+	if(p_type == IP_Address::TYPE_IPV6) {
+		// Use IPv6 only socket
+		int yes = 1;
+		if(setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY, (const char*)&yes, sizeof(yes)) != 0) {
+				WARN_PRINT("Unable to unset IPv4 address mapping over IPv6");
+		}
+	}
 #ifndef NO_FCNTL
 	fcntl(sockfd, F_SETFL, O_NONBLOCK);
 #else
-- 
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