1 files changed, 31 insertions, 0 deletions
diff --git a/src/net/sockoptip_linux.go b/src/net/sockoptip_linux.go
new file mode 100644
index 000000000..a69b778e4
--- /dev/null
+++ b/src/net/sockoptip_linux.go
@@ -0,0 +1,31 @@
+// Copyright 2011 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package net
+
+import (
+	"os"
+	"syscall"
+)
+
+func setIPv4MulticastInterface(fd *netFD, ifi *Interface) error {
+	var v int32
+	if ifi != nil {
+		v = int32(ifi.Index)
+	}
+	mreq := &syscall.IPMreqn{Ifindex: v}
+	if err := fd.incref(); err != nil {
+		return err
+	}
+	defer fd.decref()
+	return os.NewSyscallError("setsockopt", syscall.SetsockoptIPMreqn(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF, mreq))
+}
+
+func setIPv4MulticastLoopback(fd *netFD, v bool) error {
+	if err := fd.incref(); err != nil {
+		return err
+	}
+	defer fd.decref()
+	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP, boolint(v)))
+}