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derp: give trusted mesh peers longer write timeouts

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Updates tailscale/corp#24014

Change-Id: I700872be48ab337dce8e11cabef7f82b97f0422a
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2024-10-18 07:47:05 -07:00 committed by Brad Fitzpatrick
parent c0a9895748
commit 18fc093c0d
1 changed files with 14 additions and 1 deletions
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15
derp/derp_server.go
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@ -74,6 +74,7 @@ func init() {
const (
perClientSendQueueDepth = 32 // packets buffered for sending
writeTimeout = 2 * time.Second
privilegedWriteTimeout = 30 * time.Second // for clients with the mesh key
)
// dupPolicy is a temporary (2021-08-30) mechanism to change the policy
@ -1721,7 +1722,19 @@ func (c *sclient) sendLoop(ctx context.Context) error {
}
func (c *sclient) setWriteDeadline() {
c.nc.SetWriteDeadline(time.Now().Add(writeTimeout))
d := writeTimeout
if c.canMesh {
// Trusted peers get more tolerance.
//
// The "canMesh" is a bit of a misnomer; mesh peers typically run over a
// different interface for a per-region private VPC and are not
// throttled. But monitoring software elsewhere over the internet also
// use the private mesh key to subscribe to connect/disconnect events
// and might hit throttling and need more time to get the initial dump
// of connected peers.
d = privilegedWriteTimeout
}
c.nc.SetWriteDeadline(time.Now().Add(d))
}
// sendKeepAlive sends a keep-alive frame, without flushing.