From 9f6249b26d2faf1289675fac0d9afaaed63b64e5 Mon Sep 17 00:00:00 2001
From: Brad Fitzpatrick <bradfitz@tailscale.com>
Date: Fri, 3 Dec 2021 12:31:16 -0800
Subject: [PATCH] ipn/policy: treat DNS service as interesting so it's not
 filtered out

The control plane is currently still eating it.

Updates #1713

Change-Id: I66a0698599d6794ab1302f9585bf29e38553c884
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
---
 ipn/policy/policy.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ipn/policy/policy.go b/ipn/policy/policy.go
index 27a4871d8..2308b9516 100644
--- a/ipn/policy/policy.go
+++ b/ipn/policy/policy.go
@@ -14,7 +14,8 @@
 // system (a version.OS value) is an interesting enough port to report
 // to our peer nodes for discovery purposes.
 func IsInterestingService(s tailcfg.Service, os string) bool {
-	if s.Proto == "peerapi4" || s.Proto == "peerapi6" {
+	switch s.Proto {
+	case tailcfg.PeerAPI4, tailcfg.PeerAPI6, tailcfg.PeerAPIDNS:
 		return true
 	}
 	if s.Proto != tailcfg.TCP {