router

type Config struct {
	LocalAddrs []netaddr.IPPrefix
	Routes     []netaddr.IPPrefix // routes to point into the Tailscale interface

	DNS dns.Config

	SubnetRoutes     []netaddr.IPPrefix     // subnets being advertised to other Tailscale nodes
	SNATSubnetRoutes bool                   // SNAT traffic to local subnets
	NetfilterMode    preftype.NetfilterMode // how much to manage netfilter rules
}

type Router interface {
	// Up brings the router up.
	Up() error

	// Set updates the OS network stack with a new Config. It may be
	// called multiple times with identical Configs, which the
	// implementation should handle gracefully.
	Set(*Config) error

	// Close closes the router.
	Close() error
}