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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
net/netns/netns_linux.go
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@ -63,12 +63,12 @@ func socketMarkWorks() bool {
return true
}
var forceBindToDevice = envknob.Bool("TS_FORCE_LINUX_BIND_TO_DEVICE")
var forceBindToDevice = envknob.RegisterBool("TS_FORCE_LINUX_BIND_TO_DEVICE")
// UseSocketMark reports whether SO_MARK is in use.
// If it doesn't, we have to use SO_BINDTODEVICE on our sockets instead.
func UseSocketMark() bool {
if forceBindToDevice {
if forceBindToDevice() {
return false
}
socketMarkWorksOnce.Do(func() {