capver, types: bump to tailscale v1.98, drop LegacyDERPString

Regenerate capver for tailscale v1.98 — `MinSupportedCapabilityVersion`
slides 109 → 113 (v1.78 → v1.80). v1.80+ clients understand
`Node.HomeDERP`, which superseded `LegacyDERPString` upstream at capver
111. Drops the emit, plumbing, the trip-wire that caught this cleanup,
the golden test fixtures, and the integration check on
`peer.LegacyDERPString()` — the sibling `HomeDERP` check covers intent.

`v1.98` was added by hand to `capver_generated.go` because tailscale
skipped publishing v1.97/v1.98 to ghcr until late in the cycle; a clean
regeneration produces the same content.

hscontrol/capver/capver.go

@@ -12,24 +12,17 @@ import (
 	"tailscale.com/util/set"
 )
 
-const (
-	// minVersionParts is the minimum number of version parts needed for major.minor.
-	minVersionParts = 2
+// minVersionParts is the minimum number of version parts needed for major.minor.
+const minVersionParts = 2
 
-	// legacyDERPCapVer is the capability version when LegacyDERP can be cleaned up.
-	legacyDERPCapVer = 111
-)
-
-// CanOldCodeBeCleanedUp is intended to be called on startup to see if
-// there are old code that can ble cleaned up, entries should contain
-// a [tailcfg.CapabilityVersion] where something can be cleaned up and a panic if it can.
-// This is only intended to catch things in tests.
+// CanOldCodeBeCleanedUp is called at server startup to panic when
+// [MinSupportedCapabilityVersion] has crossed a threshold at which a
+// backwards-compat emit path can be deleted. Each entry pairs a
+// [tailcfg.CapabilityVersion] threshold with the message identifying
+// the code to remove; today there are none.
 //
-// All uses of Capability version checks should be listed here.
+// All capability-version-gated cleanups should be registered here.
 func CanOldCodeBeCleanedUp() {
-	if MinSupportedCapabilityVersion >= legacyDERPCapVer {
-		panic("LegacyDERP can be cleaned up in tail.go")
-	}
 }
 
 func tailscaleVersSorted() []string {

hscontrol/capver/capver_generated.go

@@ -42,6 +42,7 @@ var tailscaleToCapVer = map[string]tailcfg.CapabilityVersion{
 	"v1.92": 131,
 	"v1.94": 131,
 	"v1.96": 133,
+	"v1.98": 138,
 }
 
 var capVerToTailscaleVer = map[tailcfg.CapabilityVersion]string{
@@ -77,6 +78,7 @@ var capVerToTailscaleVer = map[tailcfg.CapabilityVersion]string{
 	130: "v1.90",
 	131: "v1.92",
 	133: "v1.96",
+	138: "v1.98",
 }
 
 // SupportedMajorMinorVersions is the number of major.minor Tailscale versions supported.
@@ -84,4 +86,4 @@ const SupportedMajorMinorVersions = 10
 
 // MinSupportedCapabilityVersion represents the minimum capability version
 // supported by this Headscale instance (latest 10 minor versions)
-const MinSupportedCapabilityVersion tailcfg.CapabilityVersion = 109
+const MinSupportedCapabilityVersion tailcfg.CapabilityVersion = 113

hscontrol/capver/capver_test_data.go

@@ -9,10 +9,9 @@ var tailscaleLatestMajorMinorTests = []struct {
 	stripV   bool
 	expected []string
 }{
-	{3, false, []string{"v1.92", "v1.94", "v1.96"}},
-	{2, true, []string{"1.94", "1.96"}},
+	{3, false, []string{"v1.94", "v1.96", "v1.98"}},
+	{2, true, []string{"1.96", "1.98"}},
 	{10, true, []string{
-		"1.78",
 		"1.80",
 		"1.82",
 		"1.84",
@@ -22,6 +21,7 @@ var tailscaleLatestMajorMinorTests = []struct {
 		"1.92",
 		"1.94",
 		"1.96",
+		"1.98",
 	}},
 	{0, false, nil},
 }
@@ -30,7 +30,7 @@ var capVerMinimumTailscaleVersionTests = []struct {
 	input    tailcfg.CapabilityVersion
 	expected string
 }{
-	{109, "v1.78"},
+	{113, "v1.80"},
 	{32, "v1.24"},
 	{41, "v1.30"},
 	{46, "v1.32"},

hscontrol/mapper/tail_test.go

@@ -70,7 +70,6 @@ func TestTailNode(t *testing.T) {
 				Name:              "empty",
 				StableID:          "0",
 				HomeDERP:          0,
-				LegacyDERPString:  "127.3.3.40:0",
 				Hostinfo:          hiview(tailcfg.Hostinfo{}),
 				MachineAuthorized: true,
 
@@ -148,8 +147,7 @@ func TestTailNode(t *testing.T) {
 				PrimaryRoutes: []netip.Prefix{
 					netip.MustParsePrefix("192.168.0.0/24"),
 				},
-				HomeDERP:         0,
-				LegacyDERPString: "127.3.3.40:0",
+				HomeDERP: 0,
 				Hostinfo: hiview(tailcfg.Hostinfo{
 					RoutableIPs: []netip.Prefix{
 						tsaddr.AllIPv4(),
@@ -186,7 +184,6 @@ func TestTailNode(t *testing.T) {
 				Name:              "minimal.example.com.",
 				StableID:          "0",
 				HomeDERP:          0,
-				LegacyDERPString:  "127.3.3.40:0",
 				Hostinfo:          hiview(tailcfg.Hostinfo{}),
 				MachineAuthorized: true,
 

hscontrol/types/node.go

@@ -1185,11 +1185,7 @@ func (nv NodeView) TailNode(
 	}
 
 	var derp int
-	// TODO(kradalby): legacyDERP was removed in tailscale/tailscale@2fc4455e6dd9ab7f879d4e2f7cffc2be81f14077
-	// and should be removed after 111 is the minimum capver.
-	legacyDERP := "127.3.3.40:0" // Zero means disconnected or unknown.
 	if nv.Hostinfo().Valid() && nv.Hostinfo().NetInfo().Valid() {
-		legacyDERP = fmt.Sprintf("127.3.3.40:%d", nv.Hostinfo().NetInfo().PreferredDERP())
 		derp = nv.Hostinfo().NetInfo().PreferredDERP()
 	}
 
@@ -1266,16 +1262,15 @@ func (nv NodeView) TailNode(
 		Key:       nv.NodeKey(),
 		KeyExpiry: keyExpiry.UTC(),
 
-		Machine:          nv.MachineKey(),
-		DiscoKey:         nv.DiscoKey(),
-		Addresses:        addresses,
-		PrimaryRoutes:    primaryRoutes,
-		AllowedIPs:       allowedIPs,
-		Endpoints:        nv.Endpoints().AsSlice(),
-		HomeDERP:         derp,
-		LegacyDERPString: legacyDERP,
-		Hostinfo:         nv.Hostinfo(),
-		Created:          nv.CreatedAt().UTC(),
+		Machine:       nv.MachineKey(),
+		DiscoKey:      nv.DiscoKey(),
+		Addresses:     addresses,
+		PrimaryRoutes: primaryRoutes,
+		AllowedIPs:    allowedIPs,
+		Endpoints:     nv.Endpoints().AsSlice(),
+		HomeDERP:      derp,
+		Hostinfo:      nv.Hostinfo(),
+		Created:       nv.CreatedAt().UTC(),
 
 		Online: nv.IsOnline().Clone(),
 

integration/helpers.go

@@ -791,7 +791,6 @@ func assertValidNetmap(t *testing.T, client TailscaleClient) {
 		assert.Falsef(c, netmap.SelfNode.DiscoKey().IsZero(), "%q does not have a valid DiscoKey", client.Hostname())
 
 		for _, peer := range netmap.Peers {
-			assert.NotEqualf(c, "127.3.3.40:0", peer.LegacyDERPString(), "peer (%s) has no home DERP in %q's netmap, got: %s", peer.ComputedName(), client.Hostname(), peer.LegacyDERPString()) //nolint:staticcheck // SA1019: testing legacy field
 			assert.NotEqualf(c, 0, peer.HomeDERP(), "peer (%s) has no home DERP in %q's netmap, got: %d", peer.ComputedName(), client.Hostname(), peer.HomeDERP())
 
 			assert.Truef(c, peer.Hostinfo().Valid(), "peer (%s) of %q does not have Hostinfo", peer.ComputedName(), client.Hostname())