1 // Copyright 2017 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
12 "golang.org/x/net/internal/socket"
15 func (c *packetHandler) readFrom(b []byte) (h *Header, p []byte, cm *ControlMessage, err error) {
19 OOB: NewControlMessage(c.rawOpt.cflags),
22 if err := c.RecvMsg(&m, 0); err != nil {
23 return nil, nil, nil, &net.OpError{Op: "read", Net: c.IPConn.LocalAddr().Network(), Source: c.IPConn.LocalAddr(), Err: err}
26 if hs, p, err = slicePacket(b[:m.N]); err != nil {
27 return nil, nil, nil, &net.OpError{Op: "read", Net: c.IPConn.LocalAddr().Network(), Source: c.IPConn.LocalAddr(), Err: err}
29 if h, err = ParseHeader(hs); err != nil {
30 return nil, nil, nil, &net.OpError{Op: "read", Net: c.IPConn.LocalAddr().Network(), Source: c.IPConn.LocalAddr(), Err: err}
33 cm = new(ControlMessage)
34 if err := cm.Parse(m.OOB[:m.NN]); err != nil {
35 return nil, nil, nil, &net.OpError{Op: "read", Net: c.IPConn.LocalAddr().Network(), Source: c.IPConn.LocalAddr(), Err: err}
38 if src, ok := m.Addr.(*net.IPAddr); ok && cm != nil {
44 func (c *packetHandler) writeTo(h *Header, p []byte, cm *ControlMessage) error {
48 wh, err := h.Marshal()
52 m.Buffers = [][]byte{wh, p}
53 dst := new(net.IPAddr)
55 if ip := cm.Dst.To4(); ip != nil {
63 if err := c.SendMsg(&m, 0); err != nil {
64 return &net.OpError{Op: "write", Net: c.IPConn.LocalAddr().Network(), Source: c.IPConn.LocalAddr(), Addr: opAddr(dst), Err: err}