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95635857dc
Replace CanPMTUD() with ShouldPMTUD() to check if peer path MTU discovery should be enabled, in preparation for adding support for enabling/disabling peer MTU dynamically. Updated #311 Signed-off-by: Val <valerie@tailscale.com>
43 lines
1.2 KiB
Go
43 lines
1.2 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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//go:build (darwin && !ios) || (linux && !android)
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package magicsock
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import (
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"syscall"
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)
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// getIPProto returns the value of the get/setsockopt proto argument necessary
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// to set an IP sockopt that corresponds with the string network, which must be
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// "udp4" or "udp6".
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func getIPProto(network string) int {
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if network == "udp4" {
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return syscall.IPPROTO_IP
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}
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return syscall.IPPROTO_IPV6
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}
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// connControl allows the caller to run a system call on the socket underlying
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// Conn specified by the string network, which must be "udp4" or "udp6". If the
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// pconn type implements the syscall method, this function returns the value of
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// of the system call fn called with the fd of the socket as its arg (or the
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// error from rc.Control() if that fails). Otherwise it returns the error
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// errUnsupportedConnType.
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func (c *Conn) connControl(network string, fn func(fd uintptr)) error {
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pconn := c.pconn4.pconn
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if network == "udp6" {
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pconn = c.pconn6.pconn
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}
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sc, ok := pconn.(syscall.Conn)
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if !ok {
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return errUnsupportedConnType
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}
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rc, err := sc.SyscallConn()
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if err != nil {
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return err
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}
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return rc.Control(fn)
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}
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