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// Copyright 2013 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 !go1.9
// +build darwin dragonfly freebsd linux netbsd openbsd solaris
package ipv6
import "net"
func (c *payloadHandler) readFrom(b []byte) (n int, cm *ControlMessage, src net.Addr, err error) {
c.rawOpt.RLock()
oob := NewControlMessage(c.rawOpt.cflags)
c.rawOpt.RUnlock()
var nn int
switch c := c.PacketConn.(type) {
case *net.UDPConn:
if n, nn, _, src, err = c.ReadMsgUDP(b, oob); err != nil {
return 0, nil, nil, err
}
case *net.IPConn:
if n, nn, _, src, err = c.ReadMsgIP(b, oob); err != nil {
return 0, nil, nil, err
}
default:
return 0, nil, nil, &net.OpError{Op: "read", Net: c.LocalAddr().Network(), Source: c.LocalAddr(), Err: errInvalidConnType}
}
if nn > 0 {
cm = new(ControlMessage)
if err = cm.Parse(oob[:nn]); err != nil {
return 0, nil, nil, &net.OpError{Op: "read", Net: c.PacketConn.LocalAddr().Network(), Source: c.PacketConn.LocalAddr(), Err: err}
}
}
if cm != nil {
cm.Src = netAddrToIP16(src)
}
return
}
func (c *payloadHandler) writeTo(b []byte, cm *ControlMessage, dst net.Addr) (n int, err error) {
oob := cm.Marshal()
if dst == nil {
return 0, &net.OpError{Op: "write", Net: c.PacketConn.LocalAddr().Network(), Source: c.PacketConn.LocalAddr(), Err: errMissingAddress}
}
switch c := c.PacketConn.(type) {
case *net.UDPConn:
n, _, err = c.WriteMsgUDP(b, oob, dst.(*net.UDPAddr))
case *net.IPConn:
n, _, err = c.WriteMsgIP(b, oob, dst.(*net.IPAddr))
default:
return 0, &net.OpError{Op: "write", Net: c.LocalAddr().Network(), Source: c.LocalAddr(), Addr: opAddr(dst), Err: errInvalidConnType}
}
return
}
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