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wgengine/magicsock: don't use BPF receive when SO_MARK doesn't work.

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Fixes #5607

Signed-off-by: David Anderson <danderson@tailscale.com>
This commit is contained in:
David Anderson
2022-09-12 14:31:20 -07:00
committed by Dave Anderson
parent c312e0d264
commit 7c49db02a2
2 changed files with 9 additions and 3 deletions
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6
net/netns/netns_linux.go
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@@ -65,9 +65,9 @@ func socketMarkWorks() bool {
var forceBindToDevice = envknob.Bool("TS_FORCE_LINUX_BIND_TO_DEVICE")
// useSocketMark reports whether SO_MARK works.
// 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 {
func UseSocketMark() bool {
if forceBindToDevice {
return false
}
@@ -103,7 +103,7 @@ func controlC(network, address string, c syscall.RawConn) error {
var sockErr error
err := c.Control(func(fd uintptr) {
if useSocketMark() {
if UseSocketMark() {
sockErr = setBypassMark(fd)
} else {
sockErr = bindToDevice(fd)