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net/netns: add TS_FORCE_LINUX_BIND_TO_DEVICE for Linux

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For debugging a macOS-specific magicsock issue. macOS runs in
bind-to-interface mode always. This lets me force Linux into the same
mode as macOS, even if the Linux kernel supports SO_MARK, as it
usually does.

Updates #2331 etc

Change-Id: Iac9e4a7429c1781337e716ffc914443b7aa2869d
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2022-09-10 17:46:09 -07:00 committed by Brad Fitzpatrick
parent f3ce1e2536
commit 81bc4992f2
1 changed files with 6 additions and 0 deletions
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6
net/netns/netns_linux.go
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@ -15,6 +15,7 @@
"syscall"
"golang.org/x/sys/unix"
"tailscale.com/envknob"
"tailscale.com/net/interfaces"
"tailscale.com/types/logger"
)
@ -62,9 +63,14 @@ func socketMarkWorks() bool {
return true
}
var forceBindToDevice = envknob.Bool("TS_FORCE_LINUX_BIND_TO_DEVICE")
// useSocketMark reports whether SO_MARK works.
// If it doesn't, we have to use SO_BINDTODEVICE on our sockets instead.
func useSocketMark() bool {
if forceBindToDevice {
return false
}
socketMarkWorksOnce.Do(func() {
socketMarkWorksOnce.v = socketMarkWorks()
})