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99e06d3544
This sets the Don't Fragment flag, for now behind the TS_DEBUG_ENABLE_PMTUD envknob. Updates #311. Signed-off-by: Val <valerie@tailscale.com> Signed-off-by: salman <salman@tailscale.com>
63 lines
3.1 KiB
Go
63 lines
3.1 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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//go:build !ios && !js
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package magicsock
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import (
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"tailscale.com/envknob"
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)
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// Various debugging and experimental tweakables, set by environment
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// variable.
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var (
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// debugDisco prints verbose logs of active discovery events as
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// they happen.
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debugDisco = envknob.RegisterBool("TS_DEBUG_DISCO")
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// debugOmitLocalAddresses removes all local interface addresses
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// from magicsock's discovered local endpoints. Used in some tests.
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debugOmitLocalAddresses = envknob.RegisterBool("TS_DEBUG_OMIT_LOCAL_ADDRS")
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// debugUseDerpRoute temporarily (2020-03-22) controls whether DERP
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// reverse routing is enabled (Issue 150).
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debugUseDerpRoute = envknob.RegisterOptBool("TS_DEBUG_ENABLE_DERP_ROUTE")
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// logDerpVerbose logs all received DERP packets, including their
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// full payload.
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logDerpVerbose = envknob.RegisterBool("TS_DEBUG_DERP")
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// debugReSTUNStopOnIdle unconditionally enables the "shut down
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// STUN if magicsock is idle" behavior that normally only triggers
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// on mobile devices, lowers the shutdown interval, and logs more
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// verbosely about idle measurements.
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debugReSTUNStopOnIdle = envknob.RegisterBool("TS_DEBUG_RESTUN_STOP_ON_IDLE")
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// debugAlwaysDERP disables the use of UDP, forcing all peer communication over DERP.
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debugAlwaysDERP = envknob.RegisterBool("TS_DEBUG_ALWAYS_USE_DERP")
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// debugDERPAddr sets the derp address manually, overriding the DERP map from control.
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debugUseDERPAddr = envknob.RegisterString("TS_DEBUG_USE_DERP_ADDR")
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// debugDERPUseHTTP tells clients to connect to DERP via HTTP on port 3340 instead of
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// HTTPS on 443.
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debugUseDERPHTTP = envknob.RegisterBool("TS_DEBUG_USE_DERP_HTTP")
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// debugEnableSilentDisco disables the use of heartbeatTimer on the endpoint struct
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// and attempts to handle disco silently. See issue #540 for details.
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debugEnableSilentDisco = envknob.RegisterBool("TS_DEBUG_ENABLE_SILENT_DISCO")
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// debugSendCallMeUnknownPeer sends a CallMeMaybe to a non-existent destination every
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// time we send a real CallMeMaybe to test the PeerGoneNotHere logic.
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debugSendCallMeUnknownPeer = envknob.RegisterBool("TS_DEBUG_SEND_CALLME_UNKNOWN_PEER")
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// debugBindSocket prints extra debugging about socket rebinding in magicsock.
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debugBindSocket = envknob.RegisterBool("TS_DEBUG_MAGICSOCK_BIND_SOCKET")
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// debugRingBufferMaxSizeBytes overrides the default size of the endpoint
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// history ringbuffer.
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debugRingBufferMaxSizeBytes = envknob.RegisterInt("TS_DEBUG_MAGICSOCK_RING_BUFFER_MAX_SIZE_BYTES")
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// debugPMTUD enables path MTU discovery. Currently only sets the Don't Fragment sockopt.
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debugPMTUD = envknob.RegisterBool("TS_DEBUG_ENABLE_PMTUD")
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// Hey you! Adding a new debugknob? Make sure to stub it out in the debugknob_stubs.go
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// file too.
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)
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// inTest reports whether the running program is a test that set the
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// IN_TS_TEST environment variable.
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//
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// Unlike the other debug tweakables above, this one needs to be
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// checked every time at runtime, because tests set this after program
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// startup.
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func inTest() bool { return envknob.Bool("IN_TS_TEST") }
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