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127 lines
4.0 KiB
Go
127 lines
4.0 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 wgengine
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import (
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"errors"
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"time"
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"github.com/tailscale/wireguard-go/wgcfg"
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"tailscale.com/control/controlclient"
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"tailscale.com/ipn/ipnstate"
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"tailscale.com/tailcfg"
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"tailscale.com/wgengine/filter"
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"tailscale.com/wgengine/router"
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"tailscale.com/wgengine/tsdns"
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)
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// ByteCount is the number of bytes that have been sent or received.
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//
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// TODO: why is this a type? remove?
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// TODO: document whether it's payload bytes only or if it includes framing overhead.
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type ByteCount int64
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type PeerStatus struct {
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TxBytes, RxBytes ByteCount
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LastHandshake time.Time
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NodeKey tailcfg.NodeKey
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}
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// Status is the Engine status.
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//
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// TODO(bradfitz): remove this, subset of ipnstate? Need to migrate users.
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type Status struct {
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Peers []PeerStatus
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LocalAddrs []string // TODO(crawshaw): []wgcfg.Endpoint?
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DERPs int // number of active DERP connections
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}
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// StatusCallback is the type of status callbacks used by
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// Engine.SetStatusCallback.
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//
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// Exactly one of Status or error is non-nil.
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type StatusCallback func(*Status, error)
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// NetInfoCallback is the type used by Engine.SetNetInfoCallback.
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type NetInfoCallback func(*tailcfg.NetInfo)
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// ErrNoChanges is returned by Engine.Reconfig if no changes were made.
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var ErrNoChanges = errors.New("no changes made to Engine config")
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// Engine is the Tailscale WireGuard engine interface.
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type Engine interface {
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// Reconfig reconfigures WireGuard and makes sure it's running.
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// This also handles setting up any kernel routes.
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//
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// This is called whenever tailcontrol (the control plane)
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// sends an updated network map.
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//
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// The returned error is ErrNoChanges if no changes were made.
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Reconfig(*wgcfg.Config, *router.Config) error
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// GetFilter returns the current packet filter, if any.
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GetFilter() *filter.Filter
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// SetFilter updates the packet filter.
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SetFilter(*filter.Filter)
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// SetDNSMap updates the DNS map.
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SetDNSMap(*tsdns.Map)
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// SetStatusCallback sets the function to call when the
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// WireGuard status changes.
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SetStatusCallback(StatusCallback)
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// RequestStatus requests a WireGuard status update right
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// away, sent to the callback registered via SetStatusCallback.
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RequestStatus()
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// Close shuts down this wireguard instance, remove any routes
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// it added, etc. To bring it up again later, you'll need a
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// new Engine.
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Close()
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// Wait waits until the Engine's Close method is called or the
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// engine aborts with an error. You don't have to call this.
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// TODO: return an error?
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Wait()
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// LinkChange informs the engine that the system network
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// link has changed. The isExpensive parameter is set on links
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// where sending packets uses substantial power or money,
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// such as mobile data on a phone.
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//
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// LinkChange should be called whenever something changed with
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// the network, no matter how minor. The implementation should
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// look at the state of the network and decide whether the
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// change from before is interesting enough to warrant taking
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// action on.
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LinkChange(isExpensive bool)
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// SetDERPMap controls which (if any) DERP servers are used.
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// If nil, DERP is disabled. It starts disabled until a DERP map
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// is configured.
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SetDERPMap(*tailcfg.DERPMap)
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// SetNetworkMap informs the engine of the latest network map
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// from the server. The network map's DERPMap field should be
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// ignored as as it might be disabled; get it from SetDERPMap
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// instead.
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// The network map should only be read from.
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SetNetworkMap(*controlclient.NetworkMap)
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// SetNetInfoCallback sets the function to call when a
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// new NetInfo summary is available.
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SetNetInfoCallback(NetInfoCallback)
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// DiscoPublicKey gets the public key used for path discovery
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// messages.
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DiscoPublicKey() tailcfg.DiscoKey
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// UpdateStatus populates the network state using the provided
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// status builder.
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UpdateStatus(*ipnstate.StatusBuilder)
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}
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