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tailcfg, wgengine, controlclient: add control-side gating of lazy WG config

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This commit is contained in:
Brad Fitzpatrick
2020-08-20 13:21:25 -07:00
parent 4d56d19b46
commit 9337a99dff
3 changed files with 35 additions and 8 deletions
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13
wgengine/userspace.go
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@@ -574,7 +574,10 @@ func (e *userspaceEngine) pinger(peerKey wgcfg.Key, ips []wgcfg.IP) {
p.run(ctx, peerKey, ips, srcIP)
}
var debugTrimWireguard, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_TRIM_WIREGUARD"))
var (
debugTrimWireguardEnv = os.Getenv("TS_DEBUG_TRIM_WIREGUARD")
debugTrimWireguard, _ = strconv.ParseBool(debugTrimWireguardEnv)
)
// forceFullWireguardConfig reports whether we should give wireguard
// our full network map, even for inactive peers
@@ -584,9 +587,13 @@ var debugTrimWireguard, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_TRIM_WIREGUARD
// and we haven't got enough time testing it.
func forceFullWireguardConfig(numPeers int) bool {
// Did the user explicitly enable trimmming via the environment variable knob?
if debugTrimWireguard {
return false
if debugTrimWireguardEnv != "" {
return !debugTrimWireguard
}
if opt := controlclient.TrimWGConfig(); opt != "" {
return !opt.EqualBool(true)
}
// On iOS with large networks, it's critical, so turn on trimming.
// Otherwise we run out of memory from wireguard-go goroutine stacks+buffers.
// This will be the default later for all platforms and network sizes.