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98 lines
2.9 KiB
Go
98 lines
2.9 KiB
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package router presents an interface to manipulate the host network
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// stack's state.
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package router
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import (
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"github.com/tailscale/wireguard-go/device"
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"github.com/tailscale/wireguard-go/tun"
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"inet.af/netaddr"
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"tailscale.com/types/logger"
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"tailscale.com/wgengine/router/dns"
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)
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// Router is responsible for managing the system network stack.
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//
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// There is typically only one instance of this interface per process.
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type Router interface {
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// Up brings the router up.
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Up() error
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// Set updates the OS network stack with a new Config. It may be
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// called multiple times with identical Configs, which the
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// implementation should handle gracefully.
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Set(*Config) error
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// Close closes the router.
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Close() error
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}
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// New returns a new Router for the current platform, using the
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// provided tun device.
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func New(logf logger.Logf, wgdev *device.Device, tundev tun.Device) (Router, error) {
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logf = logger.WithPrefix(logf, "router: ")
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return newUserspaceRouter(logf, wgdev, tundev)
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}
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// Cleanup restores the system network configuration to its original state
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// in case the Tailscale daemon terminated without closing the router.
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// No other state needs to be instantiated before this runs.
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func Cleanup(logf logger.Logf, interfaceName string) {
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mconfig := dns.ManagerConfig{
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Logf: logf,
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InterfaceName: interfaceName,
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Cleanup: true,
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}
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dns := dns.NewManager(mconfig)
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if err := dns.Down(); err != nil {
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logf("dns down: %v", err)
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}
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cleanup(logf, interfaceName)
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}
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// NetfilterMode is the firewall management mode to use when
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// programming the Linux network stack.
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type NetfilterMode int
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const (
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NetfilterOff NetfilterMode = iota // remove all tailscale netfilter state
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NetfilterNoDivert // manage tailscale chains, but don't call them
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NetfilterOn // manage tailscale chains and call them from main chains
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)
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func (m NetfilterMode) String() string {
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switch m {
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case NetfilterOff:
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return "off"
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case NetfilterNoDivert:
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return "nodivert"
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case NetfilterOn:
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return "on"
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default:
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return "???"
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}
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}
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// Config is the subset of Tailscale configuration that is relevant to
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// the OS's network stack.
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type Config struct {
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LocalAddrs []netaddr.IPPrefix
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Routes []netaddr.IPPrefix // routes to point into the Tailscale interface
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DNS dns.Config
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// Linux-only things below, ignored on other platforms.
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SubnetRoutes []netaddr.IPPrefix // subnets being advertised to other Tailscale nodes
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SNATSubnetRoutes bool // SNAT traffic to local subnets
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NetfilterMode NetfilterMode // how much to manage netfilter rules
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}
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// shutdownConfig is a routing configuration that removes all router
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// state from the OS. It's the config used when callers pass in a nil
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// Config.
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var shutdownConfig = Config{}
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