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4c793014af
Use IPV6_MTU_DISCOVER for setting don't fragment on IPv6 sockets on Linux (was using IP_MTU_DISCOVER, the IPv4 arg). Updates #311 Signed-off-by: Val <valerie@tailscale.com>
35 lines
807 B
Go
35 lines
807 B
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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//go:build linux && !android
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package magicsock
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import (
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"net"
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"syscall"
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"tailscale.com/types/nettype"
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)
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func setDontFragment(pconn nettype.PacketConn, network string) (err error) {
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if c, ok := pconn.(*net.UDPConn); ok {
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rc, err := c.SyscallConn()
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if err == nil {
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rc.Control(func(fd uintptr) {
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if network == "udp4" {
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err = syscall.SetsockoptInt(int(fd), syscall.IPPROTO_IP, syscall.IP_MTU_DISCOVER, syscall.IP_PMTUDISC_DO)
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}
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if network == "udp6" {
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err = syscall.SetsockoptInt(int(fd), syscall.IPPROTO_IPV6, syscall.IPV6_MTU_DISCOVER, syscall.IP_PMTUDISC_DO)
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}
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})
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}
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}
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return err
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}
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func CanPMTUD() bool {
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return debugEnablePMTUD() // only if the envknob is enabled, for now.
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}
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