fea: access for ceci.

vendor/golang.org/x/net/ipv6/payload_cmsg.go

@@ -2,11 +2,15 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux netbsd openbsd solaris
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
 
 package ipv6
 
-import "net"
+import (
+	"net"
+
+	"golang.org/x/net/internal/socket"
+)
 
 // ReadFrom reads a payload of the received IPv6 datagram, from the
 // endpoint c, copying the payload into b. It returns the number of
@@ -16,7 +20,32 @@ func (c *payloadHandler) ReadFrom(b []byte) (n int, cm *ControlMessage, src net.
 	if !c.ok() {
 		return 0, nil, nil, errInvalidConn
 	}
-	return c.readFrom(b)
+	c.rawOpt.RLock()
+	m := socket.Message{
+		Buffers: [][]byte{b},
+		OOB:     NewControlMessage(c.rawOpt.cflags),
+	}
+	c.rawOpt.RUnlock()
+	switch c.PacketConn.(type) {
+	case *net.UDPConn:
+		if err := c.RecvMsg(&m, 0); err != nil {
+			return 0, nil, nil, &net.OpError{Op: "read", Net: c.PacketConn.LocalAddr().Network(), Source: c.PacketConn.LocalAddr(), Err: err}
+		}
+	case *net.IPConn:
+		if err := c.RecvMsg(&m, 0); err != nil {
+			return 0, nil, nil, &net.OpError{Op: "read", Net: c.PacketConn.LocalAddr().Network(), Source: c.PacketConn.LocalAddr(), Err: err}
+		}
+	default:
+		return 0, nil, nil, &net.OpError{Op: "read", Net: c.PacketConn.LocalAddr().Network(), Source: c.PacketConn.LocalAddr(), Err: errInvalidConnType}
+	}
+	if m.NN > 0 {
+		cm = new(ControlMessage)
+		if err := cm.Parse(m.OOB[:m.NN]); err != nil {
+			return 0, nil, nil, &net.OpError{Op: "read", Net: c.PacketConn.LocalAddr().Network(), Source: c.PacketConn.LocalAddr(), Err: err}
+		}
+		cm.Src = netAddrToIP16(m.Addr)
+	}
+	return m.N, cm, m.Addr, nil
 }
 
 // WriteTo writes a payload of the IPv6 datagram, to the destination
@@ -28,5 +57,14 @@ func (c *payloadHandler) WriteTo(b []byte, cm *ControlMessage, dst net.Addr) (n
 	if !c.ok() {
 		return 0, errInvalidConn
 	}
-	return c.writeTo(b, cm, dst)
+	m := socket.Message{
+		Buffers: [][]byte{b},
+		OOB:     cm.Marshal(),
+		Addr:    dst,
+	}
+	err = c.SendMsg(&m, 0)
+	if err != nil {
+		err = &net.OpError{Op: "write", Net: c.PacketConn.LocalAddr().Network(), Source: c.PacketConn.LocalAddr(), Addr: opAddr(dst), Err: err}
+	}
+	return m.N, err
 }