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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
*/
package conn
import (
"net"
"syscall"
)
// UDP socket read/write buffer size (7MB). The value of 7MB is chosen as it is
// the max supported by a default configuration of macOS. Some platforms will
// silently clamp the value to other maximums, such as linux clamping to
// net.core.{r,w}mem_max (see _linux.go for additional implementation that works
// around this limitation)
const socketBufferSize = 7 << 20
// controlFn is the callback function signature from net.ListenConfig.Control.
// It is used to apply platform specific configuration to the socket prior to
// bind.
type controlFn func(network, address string, c syscall.RawConn) error
// controlFns is a list of functions that are called from the listen config
// that can apply socket options.
var controlFns = []controlFn{}
// listenConfig returns a net.ListenConfig that applies the controlFns to the
// socket prior to bind. This is used to apply socket buffer sizing and packet
// information OOB configuration for sticky sockets.
func listenConfig() *net.ListenConfig {
return &net.ListenConfig{
Control: func(network, address string, c syscall.RawConn) error {
for _, fn := range controlFns {
if err := fn(network, address, c); err != nil {
return err
}
}
return nil
},
}
}
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