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wgengine/router: split out from wgengine.

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The router implementations are logically separate, with their own API.

Signed-off-by: David Anderson <danderson@tailscale.com>
This commit is contained in:
David Anderson
2020-04-30 13:20:09 -07:00
committed by Dave Anderson
parent ee3395e63a
commit 1ac570def7
16 changed files with 98 additions and 85 deletions
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49
wgengine/wgengine.go
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@ -6,15 +6,11 @@ package wgengine
import (
"errors"
"fmt"
"time"
"github.com/tailscale/wireguard-go/device"
"github.com/tailscale/wireguard-go/tun"
"github.com/tailscale/wireguard-go/wgcfg"
"tailscale.com/ipn/ipnstate"
"tailscale.com/tailcfg"
"tailscale.com/types/logger"
"tailscale.com/wgengine/filter"
)
@ -48,51 +44,6 @@ type StatusCallback func(*Status, error)
// NetInfoCallback is the type used by Engine.SetNetInfoCallback.
type NetInfoCallback func(*tailcfg.NetInfo)
// RouteSettings is the full WireGuard config data (set of peers keys,
// IP, etc in wgcfg.Config) plus the things that WireGuard doesn't do
// itself, like DNS stuff.
type RouteSettings struct {
LocalAddr wgcfg.CIDR // TODO: why is this here? how does it differ from wgcfg.Config's info?
DNS []wgcfg.IP
DNSDomains []string
Cfg *wgcfg.Config
}
// OnlyRelevantParts returns a string minimally describing the route settings.
func (rs *RouteSettings) OnlyRelevantParts() string {
var peers [][]wgcfg.CIDR
for _, p := range rs.Cfg.Peers {
peers = append(peers, p.AllowedIPs)
}
return fmt.Sprintf("%v %v %v %v",
rs.LocalAddr, rs.DNS, rs.DNSDomains, peers)
}
// NewUserspaceRouter returns a new Router for the current platform, using the provided tun device.
func NewUserspaceRouter(logf logger.Logf, wgdev *device.Device, tundev tun.Device) (Router, error) {
return newUserspaceRouter(logf, wgdev, tundev)
}
// RouterGen is the signature for the two funcs that create Router implementations:
// NewUserspaceRouter (which varies by operating system) and NewFakeRouter.
type RouterGen func(logf logger.Logf, wgdev *device.Device, tundev tun.Device) (Router, error)
// Router is responsible for managing the system route table.
//
// There's only one instance, and one per-OS implementation.
type Router interface {
// Up brings the router up.
Up() error
// SetRoutes is called regularly on network map updates.
// It's how you kernel route table entries are populated for
// each peer.
SetRoutes(RouteSettings) error
// Close closes the router.
Close() error
}
// ErrNoChanges is returned by Engine.Reconfig if no changes were made.
var ErrNoChanges = errors.New("no changes made to Engine config")