tailscale/wgengine/wgengine.go

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// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package wgengine
import (
"errors"
"net/netip"
"time"
"tailscale.com/ipn/ipnstate"
"tailscale.com/net/dns"
"tailscale.com/tailcfg"
"tailscale.com/types/key"
"tailscale.com/types/netmap"
"tailscale.com/wgengine/filter"
"tailscale.com/wgengine/monitor"
"tailscale.com/wgengine/router"
"tailscale.com/wgengine/wgcfg"
)
// Status is the Engine status.
//
// TODO(bradfitz): remove this, subset of ipnstate? Need to migrate users.
type Status struct {
AsOf time.Time // the time at which the status was calculated
Peers []ipnstate.PeerStatusLite
LocalAddrs []tailcfg.Endpoint // the set of possible endpoints for the magic conn
DERPs int // number of active DERP connections
}
// StatusCallback is the type of status callbacks used by
// Engine.SetStatusCallback.
//
// Exactly one of Status or error is non-nil.
type StatusCallback func(*Status, error)
// NetInfoCallback is the type used by Engine.SetNetInfoCallback.
type NetInfoCallback func(*tailcfg.NetInfo)
// NetworkMapCallback is the type used by callbacks that hook
// into network map updates.
type NetworkMapCallback func(*netmap.NetworkMap)
// someHandle is allocated so its pointer address acts as a unique
// map key handle. (It needs to have non-zero size for Go to guarantee
// the pointer is unique.)
type someHandle struct{ _ byte }
// ErrNoChanges is returned by Engine.Reconfig if no changes were made.
var ErrNoChanges = errors.New("no changes made to Engine config")
// PeerForIP is the type returned by Engine.PeerForIP.
type PeerForIP struct {
// Node is the matched node. It's always non-nil when
// Engine.PeerForIP returns ok==true.
Node *tailcfg.Node
// IsSelf is whether the Node is the local process.
IsSelf bool
// Route is the route that matched the IP provided
// to Engine.PeerForIP.
Route netip.Prefix
}
// Engine is the Tailscale WireGuard engine interface.
type Engine interface {
// Reconfig reconfigures WireGuard and makes sure it's running.
// This also handles setting up any kernel routes.
//
// This is called whenever tailcontrol (the control plane)
// sends an updated network map.
//
// The *tailcfg.Debug parameter can be nil.
//
// The returned error is ErrNoChanges if no changes were made.
Reconfig(*wgcfg.Config, *router.Config, *dns.Config, *tailcfg.Debug) error
// PeerForIP returns the node to which the provided IP routes,
// if any. If none is found, (nil, nil) is returned.
PeerForIP(netip.Addr) (_ PeerForIP, ok bool)
// GetFilter returns the current packet filter, if any.
GetFilter() *filter.Filter
// SetFilter updates the packet filter.
SetFilter(*filter.Filter)
// SetStatusCallback sets the function to call when the
// WireGuard status changes.
SetStatusCallback(StatusCallback)
// GetLinkMonitor returns the link monitor.
GetLinkMonitor() *monitor.Mon
// RequestStatus requests a WireGuard status update right
// away, sent to the callback registered via SetStatusCallback.
RequestStatus()
// Close shuts down this wireguard instance, remove any routes
// it added, etc. To bring it up again later, you'll need a
// new Engine.
Close()
// Wait waits until the Engine's Close method is called or the
// engine aborts with an error. You don't have to call this.
// TODO: return an error?
Wait()
// LinkChange informs the engine that the system network
// link has changed.
//
// The isExpensive parameter is not used.
//
// LinkChange should be called whenever something changed with
// the network, no matter how minor.
//
// Deprecated: don't use this method. It was removed shortly
// before the Tailscale 1.6 release when we remembered that
// Android doesn't use the Linux-based link monitor and has
// its own mechanism that uses LinkChange. Android is the only
// caller of this method now. Don't add more.
LinkChange(isExpensive bool)
// SetDERPMap controls which (if any) DERP servers are used.
// If nil, DERP is disabled. It starts disabled until a DERP map
// is configured.
SetDERPMap(*tailcfg.DERPMap)
// SetNetworkMap informs the engine of the latest network map
// from the server. The network map's DERPMap field should be
// ignored as as it might be disabled; get it from SetDERPMap
// instead.
// The network map should only be read from.
SetNetworkMap(*netmap.NetworkMap)
// AddNetworkMapCallback adds a function to a list of callbacks
// that are called when the network map updates. It returns a
// function that when called would remove the function from the
// list of callbacks.
AddNetworkMapCallback(NetworkMapCallback) (removeCallback func())
// SetNetInfoCallback sets the function to call when a
// new NetInfo summary is available.
SetNetInfoCallback(NetInfoCallback)
// DiscoPublicKey gets the public key used for path discovery
// messages.
DiscoPublicKey() key.DiscoPublic
// UpdateStatus populates the network state using the provided
// status builder.
UpdateStatus(*ipnstate.StatusBuilder)
// Ping is a request to start a ping with the peer handling the given IP and
// then call cb with its ping latency & method.
Ping(ip netip.Addr, pingType tailcfg.PingType, cb func(*ipnstate.PingResult))
// RegisterIPPortIdentity registers a given node (identified by its
// Tailscale IP) as temporarily having the given IP:port for whois lookups.
// The IP:port is generally a localhost IP and an ephemeral port, used
// while proxying connections to localhost when tailscaled is running
// in netstack mode.
RegisterIPPortIdentity(netip.AddrPort, netip.Addr)
// UnregisterIPPortIdentity removes a temporary IP:port registration
// made previously by RegisterIPPortIdentity.
UnregisterIPPortIdentity(netip.AddrPort)
// WhoIsIPPort looks up an IP:port in the temporary registrations,
// and returns a matching Tailscale IP, if it exists.
WhoIsIPPort(netip.AddrPort) (netip.Addr, bool)
}