net/{batching,packet},wgengine/magicsock: export batchingConn (#16848)

For eventual use by net/udprelay.Server.

Updates tailscale/corp#31164

Signed-off-by: Jordan Whited <jordan@tailscale.com>

wgengine/magicsock/debughttp.go

@@ -152,7 +152,7 @@ func printEndpointHTML(w io.Writer, ep *endpoint) {
 	io.WriteString(w, "<p>Endpoints:</p><ul>")
 	for _, ipp := range eps {
 		s := ep.endpointState[ipp]
-		if ipp == ep.bestAddr.ap && !ep.bestAddr.vni.isSet() {
+		if ipp == ep.bestAddr.ap && !ep.bestAddr.vni.IsSet() {
 			fmt.Fprintf(w, "<li><b>%s</b>: (best)<ul>", ipp)
 		} else {
 			fmt.Fprintf(w, "<li>%s: ...<ul>", ipp)
@@ -208,7 +208,7 @@ func epAddrLess(a, b epAddr) bool {
 		return v < 0
 	}
 	if a.ap.Port() == b.ap.Port() {
-		return a.vni.get() < b.vni.get()
+		return a.vni.Get() < b.vni.Get()
 	}
 	return a.ap.Port() < b.ap.Port()
 }