frp/vendor/golang.org/x/net/ipv4/payload.go

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// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package ipv4
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import (
"net"
"golang.org/x/net/internal/socket"
)
// BUG(mikio): On Windows, the ControlMessage for ReadFrom and WriteTo
// methods of PacketConn is not implemented.
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// A payloadHandler represents the IPv4 datagram payload handler.
type payloadHandler struct {
net.PacketConn
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*socket.Conn
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rawOpt
}
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func (c *payloadHandler) ok() bool { return c != nil && c.PacketConn != nil && c.Conn != nil }