1 // Copyright 2013 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.
4 5 //go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
6 7 package ipv6
8 9 import (
10 "net"
11 12 "golang.org/x/net/internal/socket"
13 )
14 15 // ReadFrom reads a payload of the received IPv6 datagram, from the
16 // endpoint c, copying the payload into b. It returns the number of
17 // bytes copied into b, the control message cm and the source address
18 // src of the received datagram.
19 func (c *payloadHandler) ReadFrom(b []byte) (n int, cm *ControlMessage, src net.Addr, err error) {
20 if !c.ok() {
21 return 0, nil, nil, errInvalidConn
22 }
23 c.rawOpt.RLock()
24 m := socket.Message{
25 Buffers: [][]byte{b},
26 OOB: NewControlMessage(c.rawOpt.cflags),
27 }
28 c.rawOpt.RUnlock()
29 switch c.PacketConn.(type) {
30 case *net.UDPConn:
31 if err := c.RecvMsg(&m, 0); err != nil {
32 return 0, nil, nil, &net.OpError{Op: "read", Net: c.PacketConn.LocalAddr().Network(), Source: c.PacketConn.LocalAddr(), Err: err}
33 }
34 case *net.IPConn:
35 if err := c.RecvMsg(&m, 0); err != nil {
36 return 0, nil, nil, &net.OpError{Op: "read", Net: c.PacketConn.LocalAddr().Network(), Source: c.PacketConn.LocalAddr(), Err: err}
37 }
38 default:
39 return 0, nil, nil, &net.OpError{Op: "read", Net: c.PacketConn.LocalAddr().Network(), Source: c.PacketConn.LocalAddr(), Err: errInvalidConnType}
40 }
41 if m.NN > 0 {
42 cm = new(ControlMessage)
43 if err := cm.Parse(m.OOB[:m.NN]); err != nil {
44 return 0, nil, nil, &net.OpError{Op: "read", Net: c.PacketConn.LocalAddr().Network(), Source: c.PacketConn.LocalAddr(), Err: err}
45 }
46 cm.Src = netAddrToIP16(m.Addr)
47 }
48 return m.N, cm, m.Addr, nil
49 }
50 51 // WriteTo writes a payload of the IPv6 datagram, to the destination
52 // address dst through the endpoint c, copying the payload from b. It
53 // returns the number of bytes written. The control message cm allows
54 // the IPv6 header fields and the datagram path to be specified. The
55 // cm may be nil if control of the outgoing datagram is not required.
56 func (c *payloadHandler) WriteTo(b []byte, cm *ControlMessage, dst net.Addr) (n int, err error) {
57 if !c.ok() {
58 return 0, errInvalidConn
59 }
60 m := socket.Message{
61 Buffers: [][]byte{b},
62 OOB: cm.Marshal(),
63 Addr: dst,
64 }
65 err = c.SendMsg(&m, 0)
66 if err != nil {
67 err = &net.OpError{Op: "write", Net: c.PacketConn.LocalAddr().Network(), Source: c.PacketConn.LocalAddr(), Addr: opAddr(dst), Err: err}
68 }
69 return m.N, err
70 }
71