ipn/ipnlocal, types/netmap: replace hasCapability with set lookup on NetworkMap

When node attributes were super rare, the O(n) slice scans looking for
node attributes was more acceptable. But now more code and more users
are using increasingly more node attributes. Time to make it a map.

Noticed while working on tailscale/corp#17879

Updates #cleanup

Change-Id: Ic17c80341f418421002fbceb47490729048756d2
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

control/controlclient/map.go

@@ -31,6 +31,7 @@ import (
 	"tailscale.com/types/views"
 	"tailscale.com/util/clientmetric"
 	"tailscale.com/util/mak"
+	"tailscale.com/util/set"
 	"tailscale.com/wgengine/filter"
 )
 
@@ -74,6 +75,7 @@ type mapSession struct {
 	// Fields storing state over the course of multiple MapResponses.
 	lastPrintMap           time.Time
 	lastNode               tailcfg.NodeView
+	lastCapSet             set.Set[tailcfg.NodeCapability]
 	peers                  map[tailcfg.NodeID]*tailcfg.NodeView // pointer to view (oddly). same pointers as sortedPeers.
 	sortedPeers            []*tailcfg.NodeView                  // same pointers as peers, but sorted by Node.ID
 	lastDNSConfig          *tailcfg.DNSConfig
@@ -239,6 +241,15 @@ func (ms *mapSession) updateStateFromResponse(resp *tailcfg.MapResponse) {
 
 	if resp.Node != nil {
 		ms.lastNode = resp.Node.View()
+
+		capSet := set.Set[tailcfg.NodeCapability]{}
+		for _, c := range resp.Node.Capabilities {
+			capSet.Add(c)
+		}
+		for c := range resp.Node.CapMap {
+			capSet.Add(c)
+		}
+		ms.lastCapSet = capSet
 	}
 
 	for _, up := range resp.UserProfiles {
@@ -803,6 +814,7 @@ func (ms *mapSession) netmap() *netmap.NetworkMap {
 		nm.SelfNode = node
 		nm.Expiry = node.KeyExpiry()
 		nm.Name = node.Name()
+		nm.AllCaps = ms.lastCapSet
 	}
 
 	ms.addUserProfile(nm, nm.User())