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https://github.com/tailscale/tailscale.git
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4722f7e322
We're using it in more and more places, and it's not really specific to our use of Wireguard (and does more just link/interface monitoring). Also removes the separate interface we had for it in sockstats -- it's a small enough package (we already pull in all of its dependencies via other paths) that it's not worth the extra complexity. Updates #7621 Updates #7850 Signed-off-by: Mihai Parparita <mihai@tailscale.com>
90 lines
2.8 KiB
Go
90 lines
2.8 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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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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"net/netip"
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"reflect"
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"github.com/tailscale/wireguard-go/tun"
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"tailscale.com/net/netmon"
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"tailscale.com/types/logger"
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"tailscale.com/types/preftype"
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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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//
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// If netMon is nil, it's not used. It's currently (2021-07-20) only
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// used on Linux in some situations.
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func New(logf logger.Logf, tundev tun.Device, netMon *netmon.Monitor) (Router, error) {
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logf = logger.WithPrefix(logf, "router: ")
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return newUserspaceRouter(logf, tundev, netMon)
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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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cleanup(logf, interfaceName)
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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 are the address(es) for this node. This is
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// typically one IPv4/32 (the 100.x.y.z CGNAT) and one
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// IPv6/128 (Tailscale ULA).
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LocalAddrs []netip.Prefix
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// Routes are the routes that point into the Tailscale
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// interface. These are the /32 and /128 routes to peers, as
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// well as any other subnets that peers are advertising and
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// this node has chosen to use.
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Routes []netip.Prefix
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// LocalRoutes are the routes that should not be routed through Tailscale.
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// There are no priorities set in how these routes are added, normal
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// routing rules apply.
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LocalRoutes []netip.Prefix
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// Linux-only things below, ignored on other platforms.
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SubnetRoutes []netip.Prefix // subnets being advertised to other Tailscale nodes
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SNATSubnetRoutes bool // SNAT traffic to local subnets
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NetfilterMode preftype.NetfilterMode // how much to manage netfilter rules
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}
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func (a *Config) Equal(b *Config) bool {
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if a == nil && b == nil {
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return true
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}
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if (a == nil) != (b == nil) {
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return false
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}
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return reflect.DeepEqual(a, b)
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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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