wgengine/router/dns: move to net/dns.

Preparation for merging the APIs and whatnot.

Signed-off-by: David Anderson <danderson@tailscale.com>

cmd/tailscaled/depaware.txt

@@ -6,7 +6,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         github.com/go-multierror/multierror                          from tailscale.com/wgengine/router+
    W 💣 github.com/go-ole/go-ole                                     from github.com/go-ole/go-ole/oleutil+
    W 💣 github.com/go-ole/go-ole/oleutil                             from tailscale.com/wgengine/winnet
-   L 💣 github.com/godbus/dbus/v5                                    from tailscale.com/wgengine/router/dns
+   L 💣 github.com/godbus/dbus/v5                                    from tailscale.com/net/dns
         github.com/google/btree                                      from inet.af/netstack/tcpip/header+
    L    github.com/josharian/native                                  from github.com/mdlayher/netlink+
    L 💣 github.com/jsimonetti/rtnetlink                              from tailscale.com/wgengine/monitor
@@ -88,6 +88,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         tailscale.com/logtail/backoff                                from tailscale.com/control/controlclient+
         tailscale.com/logtail/filch                                  from tailscale.com/logpolicy
         tailscale.com/metrics                                        from tailscale.com/derp
+        tailscale.com/net/dns                                        from tailscale.com/ipn/ipnlocal+
         tailscale.com/net/dnscache                                   from tailscale.com/control/controlclient+
         tailscale.com/net/dnsfallback                                from tailscale.com/control/controlclient
         tailscale.com/net/flowtrack                                  from tailscale.com/wgengine/filter+
@@ -125,7 +126,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         tailscale.com/types/strbuilder                               from tailscale.com/net/packet
         tailscale.com/types/structs                                  from tailscale.com/control/controlclient+
         tailscale.com/types/wgkey                                    from tailscale.com/control/controlclient+
-        tailscale.com/util/dnsname                                   from tailscale.com/wgengine/tsdns+
+        tailscale.com/util/dnsname                                   from tailscale.com/ipn/ipnstate+
   LW    tailscale.com/util/endian                                    from tailscale.com/net/netns+
    L    tailscale.com/util/lineread                                  from tailscale.com/control/controlclient+
         tailscale.com/util/pidowner                                  from tailscale.com/ipn/ipnserver
@@ -140,8 +141,6 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         tailscale.com/wgengine/monitor                               from tailscale.com/wgengine+
         tailscale.com/wgengine/netstack                              from tailscale.com/cmd/tailscaled
         tailscale.com/wgengine/router                                from tailscale.com/cmd/tailscaled+
-        tailscale.com/wgengine/router/dns                            from tailscale.com/ipn/ipnlocal+
-        tailscale.com/wgengine/tsdns                                 from tailscale.com/ipn/ipnlocal+
         tailscale.com/wgengine/tstun                                 from tailscale.com/wgengine+
         tailscale.com/wgengine/wgcfg                                 from tailscale.com/ipn/ipnlocal+
         tailscale.com/wgengine/wgcfg/nmcfg                           from tailscale.com/ipn/ipnlocal

internal/deepprint/deepprint_test.go

@@ -10,7 +10,7 @@
 
 	"inet.af/netaddr"
 	"tailscale.com/wgengine/router"
-	"tailscale.com/wgengine/router/dns"
+	"tailscale.com/net/dns"
 	"tailscale.com/wgengine/wgcfg"
 )
 

ipn/ipnlocal/local.go

@@ -38,7 +38,6 @@
 	"tailscale.com/wgengine"
 	"tailscale.com/wgengine/filter"
 	"tailscale.com/wgengine/router"
-	rdns "tailscale.com/wgengine/router/dns"
 	"tailscale.com/wgengine/wgcfg"
 	"tailscale.com/wgengine/wgcfg/nmcfg"
 )
@@ -1420,7 +1419,7 @@ func (b *LocalBackend) authReconfig() {
 			b.logf("[unexpected] dns proxied but no nameservers")
 			proxied = false
 		}
-		rcfg.DNS = rdns.Config{
+		rcfg.DNS = dns.Config{
 			Nameservers: nm.DNS.Nameservers,
 			Domains:     nm.DNS.Domains,
 			PerDomain:   nm.DNS.PerDomain,

wgengine/router/router.go

@@ -12,7 +12,7 @@
 	"inet.af/netaddr"
 	"tailscale.com/types/logger"
 	"tailscale.com/types/preftype"
-	"tailscale.com/wgengine/router/dns"
+	"tailscale.com/net/dns"
 )
 
 // Router is responsible for managing the system network stack.

wgengine/router/router_linux.go

@@ -23,7 +23,7 @@
 	"tailscale.com/types/logger"
 	"tailscale.com/types/preftype"
 	"tailscale.com/version/distro"
-	"tailscale.com/wgengine/router/dns"
+	"tailscale.com/net/dns"
 )
 
 const (

wgengine/router/router_openbsd.go

@@ -14,7 +14,7 @@
 	"github.com/tailscale/wireguard-go/tun"
 	"inet.af/netaddr"
 	"tailscale.com/types/logger"
-	"tailscale.com/wgengine/router/dns"
+	"tailscale.com/net/dns"
 )
 
 // For now this router only supports the WireGuard userspace implementation.

wgengine/router/router_userspace_bsd.go

@@ -17,7 +17,7 @@
 	"inet.af/netaddr"
 	"tailscale.com/types/logger"
 	"tailscale.com/version"
-	"tailscale.com/wgengine/router/dns"
+	"tailscale.com/net/dns"
 )
 
 type userspaceBSDRouter struct {

wgengine/router/router_windows.go

@@ -23,7 +23,7 @@
 	"inet.af/netaddr"
 	"tailscale.com/logtail/backoff"
 	"tailscale.com/types/logger"
-	"tailscale.com/wgengine/router/dns"
+	"tailscale.com/net/dns"
 )
 
 type winRouter struct {