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Diffstat (limited to 'vendor/golang.org/x/net/ipv4/control_pktinfo.go')
-rw-r--r--vendor/golang.org/x/net/ipv4/control_pktinfo.go37
1 files changed, 37 insertions, 0 deletions
diff --git a/vendor/golang.org/x/net/ipv4/control_pktinfo.go b/vendor/golang.org/x/net/ipv4/control_pktinfo.go
new file mode 100644
index 000000000..444782f39
--- /dev/null
+++ b/vendor/golang.org/x/net/ipv4/control_pktinfo.go
@@ -0,0 +1,37 @@
+// 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 linux
+
+package ipv4
+
+import (
+ "syscall"
+ "unsafe"
+
+ "golang.org/x/net/internal/iana"
+)
+
+func marshalPacketInfo(b []byte, cm *ControlMessage) []byte {
+ m := (*syscall.Cmsghdr)(unsafe.Pointer(&b[0]))
+ m.Level = iana.ProtocolIP
+ m.Type = sysIP_PKTINFO
+ m.SetLen(syscall.CmsgLen(sysSizeofInetPktinfo))
+ if cm != nil {
+ pi := (*sysInetPktinfo)(unsafe.Pointer(&b[syscall.CmsgLen(0)]))
+ if ip := cm.Src.To4(); ip != nil {
+ copy(pi.Spec_dst[:], ip)
+ }
+ if cm.IfIndex > 0 {
+ pi.setIfindex(cm.IfIndex)
+ }
+ }
+ return b[syscall.CmsgSpace(sysSizeofInetPktinfo):]
+}
+
+func parsePacketInfo(cm *ControlMessage, b []byte) {
+ pi := (*sysInetPktinfo)(unsafe.Pointer(&b[0]))
+ cm.IfIndex = int(pi.Ifindex)
+ cm.Dst = pi.Addr[:]
+}