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Set a debug knob for excluding interfaces

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Updates #1552

Signed-off-by: Lee Briggs <lee@leebriggs.co.uk>
This commit is contained in:
Lee Briggs 2025-05-12 20:40:43 -07:00
parent ffb1dda245
commit 1014beeb8d
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1 changed files with 21 additions and 2 deletions
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23
net/netmon/state.go
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@ -27,6 +27,9 @@ import (
// same interface and subnet.
var forceAllIPv6Endpoints = envknob.RegisterBool("TS_DEBUG_FORCE_ALL_IPV6_ENDPOINTS")
// set a debug knob to exclude interfaces from the list of interfaces
var excludedInterfaces = envknob.RegisterString("TS_DEBUG_EXCLUDED_INTERFACES")
// LoginEndpointForProxyDetermination is the URL used for testing
// which HTTP proxy the system should use.
var LoginEndpointForProxyDetermination = "https://controlplane.tailscale.com/"
@ -46,6 +49,22 @@ func isProblematicInterface(nif *net.Interface) bool {
return false
}
func isExcludedInterface(nif *net.Interface) bool {
if nif == nil {
return false
}
remain := excludedInterfaces()
for remain != "" {
var candidate string
candidate, remain, _ = strings.Cut(remain, ",")
if strings.TrimSpace(candidate) == nif.Name {
return true
}
}
return false
}
// LocalAddresses returns the machine's IP addresses, separated by
// whether they're loopback addresses. If there are no regular addresses
// it will return any IPv4 linklocal or IPv6 unique local addresses because we
@ -59,9 +78,9 @@ func LocalAddresses() (regular, loopback []netip.Addr, err error) {
var regular4, regular6, linklocal4, ula6 []netip.Addr
for _, iface := range ifaces {
stdIf := iface.Interface
if !isUp(stdIf) || isProblematicInterface(stdIf) {
if !isUp(stdIf) || isProblematicInterface(stdIf) || isExcludedInterface(stdIf) {
// Skip down interfaces and ones that are
// problematic that we don't want to try to
// problematic or that we don't want to try to
// send Tailscale traffic over.
continue
}