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envknob: support changing envknobs post-init

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Updates #5114

Change-Id: Ia423fc7486e1b3f3180a26308278be0086fae49b
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2022-09-14 12:49:39 -07:00
committed by Brad Fitzpatrick
parent 33ee2c058e
commit 74674b110d
31 changed files with 311 additions and 167 deletions
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4
wgengine/magicsock/magicsock_linux.go
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@ -28,7 +28,7 @@ const (
)
// Enable/disable using raw sockets to receive disco traffic.
var debugDisableRawDisco = envknob.Bool("TS_DEBUG_DISABLE_RAW_DISCO")
var debugDisableRawDisco = envknob.RegisterBool("TS_DEBUG_DISABLE_RAW_DISCO")
// These are our BPF filters that we use for testing packets.
var (
@ -125,7 +125,7 @@ var (
// and BPF filter.
// https://github.com/tailscale/tailscale/issues/3824
func (c *Conn) listenRawDisco(family string) (io.Closer, error) {
if debugDisableRawDisco {
if debugDisableRawDisco() {
return nil, errors.New("raw disco listening disabled by debug flag")
}