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wgengine/magicsock: improve don't fragment bit set/get support

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Add an enable/disable argument to setDontFragment() in preparation for dynamic
enable/disable of peer path MTU discovery. Add getDontFragment() to get the
status of the don't fragment bit from a socket.

Updates #311

Co-authored-by: James Tucker <james@tailscale.com>
Signed-off-by: Val <valerie@tailscale.com>
This commit is contained in:
Val
2023-09-18 20:23:27 +02:00
committed by valscale
parent 4c793014af
commit a5ae21a832
8 changed files with 159 additions and 46 deletions
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4
wgengine/magicsock/magicsock.go
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@@ -983,6 +983,8 @@ var errDropDerpPacket = errors.New("too many DERP packets queued; dropping")
var errNoUDP = errors.New("no UDP available on platform")
var errUnsupportedConnType = errors.New("unsupported connection type")
var (
// This acts as a compile-time check for our usage of ipv6.Message in
// batchingUDPConn for both IPv6 and IPv4 operations.
@@ -2309,7 +2311,7 @@ func (c *Conn) bindSocket(ruc *RebindingUDPConn, network string, curPortFate cur
trySetSocketBuffer(pconn, c.logf)
if CanPMTUD() {
err = setDontFragment(pconn, network)
err = c.setDontFragment(network, true)
if err != nil {
c.logf("magicsock: set dontfragment failed for %v port %d: %v", network, port, err)
// TODO disable PMTUD in this case. We don't expect the setsockopt to fail on