summaryrefslogtreecommitdiff
path: root/vendor/golang.org/x/net/ipv4/sys_asmreqn.go
diff options
context:
space:
mode:
Diffstat (limited to 'vendor/golang.org/x/net/ipv4/sys_asmreqn.go')
-rw-r--r--vendor/golang.org/x/net/ipv4/sys_asmreqn.go42
1 files changed, 42 insertions, 0 deletions
diff --git a/vendor/golang.org/x/net/ipv4/sys_asmreqn.go b/vendor/golang.org/x/net/ipv4/sys_asmreqn.go
new file mode 100644
index 0000000..1f24f69
--- /dev/null
+++ b/vendor/golang.org/x/net/ipv4/sys_asmreqn.go
@@ -0,0 +1,42 @@
+// 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 ipv4
+
+import (
+ "net"
+ "unsafe"
+
+ "golang.org/x/net/internal/socket"
+)
+
+func (so *sockOpt) getIPMreqn(c *socket.Conn) (*net.Interface, error) {
+ b := make([]byte, so.Len)
+ if _, err := so.Get(c, b); err != nil {
+ return nil, err
+ }
+ mreqn := (*ipMreqn)(unsafe.Pointer(&b[0]))
+ if mreqn.Ifindex == 0 {
+ return nil, nil
+ }
+ ifi, err := net.InterfaceByIndex(int(mreqn.Ifindex))
+ if err != nil {
+ return nil, err
+ }
+ return ifi, nil
+}
+
+func (so *sockOpt) setIPMreqn(c *socket.Conn, ifi *net.Interface, grp net.IP) error {
+ var mreqn ipMreqn
+ if ifi != nil {
+ mreqn.Ifindex = int32(ifi.Index)
+ }
+ if grp != nil {
+ mreqn.Multiaddr = [4]byte{grp[0], grp[1], grp[2], grp[3]}
+ }
+ b := (*[sizeofIPMreqn]byte)(unsafe.Pointer(&mreqn))[:sizeofIPMreqn]
+ return so.Set(c, b)
+}