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wgengine/router: add debug knob to resort to Linux "ip" command usage

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Tailscale 1.18 uses netlink instead of the "ip" command to program the
Linux kernel.

The old way was kept primarily for tests, but this also adds a
TS_DEBUG_USE_IP_COMMAND environment knob to force the old way
temporarily for debugging anybody who might have problems with the
new way in 1.18.

Updates #391

Change-Id: I0236fbfda6c9c05dcb3554fcc27ec0c86456efd9
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2021-11-18 07:46:37 -08:00 committed by Brad Fitzpatrick
parent b3d6704aa3
commit d24ed3f68e
1 changed files with 5 additions and 0 deletions
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5
wgengine/router/router_linux.go
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@ -183,12 +183,17 @@ func useAmbientCaps() bool {
return v >= 7
}
var forceIPCommand, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_USE_IP_COMMAND"))
// useIPCommand reports whether r should use the "ip" command (or its
// fake commandRunner for tests) instead of netlink.
func (r *linuxRouter) useIPCommand() bool {
if r.cmd == nil {
panic("invalid init")
}
if forceIPCommand {
return true
}
// In the future we might need to fall back to using the "ip"
// command if, say, netlink is blocked somewhere but the ip
// command is allowed to use netlink. For now we only use the ip