x/net/ipv6: add sticky source-specific multicast socket options
LGTM=iant
R=iant
CC=golang-codereviews
https://golang.org/cl/175010043
diff --git a/ipv6/sockopt_ssmreq_unix.go b/ipv6/sockopt_ssmreq_unix.go
new file mode 100644
index 0000000..8e1dcef
--- /dev/null
+++ b/ipv6/sockopt_ssmreq_unix.go
@@ -0,0 +1,31 @@
+// Copyright 2014 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.
+
+// +build darwin freebsd linux
+
+package ipv6
+
+import (
+ "net"
+ "os"
+ "unsafe"
+)
+
+func setsockoptGroupReq(fd int, opt *sockOpt, ifi *net.Interface, grp net.IP) error {
+ var gr sysGroupReq
+ if ifi != nil {
+ gr.Interface = uint32(ifi.Index)
+ }
+ gr.setGroup(grp)
+ return os.NewSyscallError("setsockopt", setsockopt(fd, opt.level, opt.name, unsafe.Pointer(&gr), sysSizeofGroupReq))
+}
+
+func setsockoptGroupSourceReq(fd int, opt *sockOpt, ifi *net.Interface, grp, src net.IP) error {
+ var gsr sysGroupSourceReq
+ if ifi != nil {
+ gsr.Interface = uint32(ifi.Index)
+ }
+ gsr.setSourceGroup(grp, src)
+ return os.NewSyscallError("setsockopt", setsockopt(fd, opt.level, opt.name, unsafe.Pointer(&gsr), sysSizeofGroupSourceReq))
+}
