mirror of https://github.com/tailscale/tailscale/
wgengine: add BSD userspace router to darwin
Darwin and FreeBSD are compatible enough to share the userspace router. The OSX router delegates to the BSD userspace router unless `SetRoutesFunc` is set. That preserves the mechanism that allows `ipn-go-bridge` to specify its own routing behavior. Fixes #177 Signed-off-by: Reinaldo de Souza <github@rei.nal.do>reviewable/pr511/r1
Reinaldo de Souza
5 years ago
committed by
Dave Anderson
parent
b87396b5d9
commit
a8635784bc
@ -0,0 +1,156 @@
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// 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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// +build darwin freebsd
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package router
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import (
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"errors"
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"fmt"
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"log"
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"os/exec"
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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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)
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type userspaceBSDRouter struct {
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logf logger.Logf
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tunname string
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local netaddr.IPPrefix
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routes map[netaddr.IPPrefix]struct{}
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}
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func newUserspaceBSDRouter(logf logger.Logf, _ *device.Device, tundev tun.Device) (Router, error) {
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tunname, err := tundev.Name()
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if err != nil {
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return nil, err
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}
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return &userspaceBSDRouter{
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logf: logf,
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tunname: tunname,
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}, nil
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}
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func (r *userspaceBSDRouter) cmd(args ...string) *exec.Cmd {
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if len(args) == 0 {
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log.Fatalf("exec.Cmd(%#v) invalid; need argv[0]\n", args)
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}
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return exec.Command(args[0], args[1:]...)
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}
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func (r *userspaceBSDRouter) Up() error {
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ifup := []string{"ifconfig", r.tunname, "up"}
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if out, err := r.cmd(ifup...).CombinedOutput(); err != nil {
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r.logf("running ifconfig failed: %v\n%s", err, out)
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return err
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}
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return nil
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}
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func (r *userspaceBSDRouter) Set(cfg *Config) error {
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if cfg == nil {
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cfg = &shutdownConfig
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}
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if len(cfg.LocalAddrs) == 0 {
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return nil
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}
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// TODO: support configuring multiple local addrs on interface.
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if len(cfg.LocalAddrs) != 1 {
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return errors.New("freebsd doesn't support setting multiple local addrs yet")
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}
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localAddr := cfg.LocalAddrs[0]
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var errq error
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// Update the address.
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if localAddr != r.local {
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// If the interface is already set, remove it.
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if r.local != (netaddr.IPPrefix{}) {
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addrdel := []string{"ifconfig", r.tunname,
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"inet", r.local.String(), "-alias"}
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out, err := r.cmd(addrdel...).CombinedOutput()
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if err != nil {
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r.logf("addr del failed: %v: %v\n%s", addrdel, err, out)
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if errq == nil {
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errq = err
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}
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}
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}
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// Add the interface.
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addradd := []string{"ifconfig", r.tunname,
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"inet", localAddr.String(), localAddr.IP.String()}
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out, err := r.cmd(addradd...).CombinedOutput()
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if err != nil {
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r.logf("addr add failed: %v: %v\n%s", addradd, err, out)
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if errq == nil {
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errq = err
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}
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}
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}
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newRoutes := make(map[netaddr.IPPrefix]struct{})
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for _, route := range cfg.Routes {
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newRoutes[route] = struct{}{}
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}
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// Delete any pre-existing routes.
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for route := range r.routes {
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if _, keep := newRoutes[route]; !keep {
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net := route.IPNet()
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nip := net.IP.Mask(net.Mask)
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nstr := fmt.Sprintf("%v/%d", nip, route.Bits)
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routedel := []string{"route", "-q", "-n",
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"del", "-inet", nstr,
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"-iface", r.tunname}
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out, err := r.cmd(routedel...).CombinedOutput()
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if err != nil {
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r.logf("route del failed: %v: %v\n%s", routedel, err, out)
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if errq == nil {
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errq = err
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}
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}
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}
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}
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// Add the routes.
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for route := range newRoutes {
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if _, exists := r.routes[route]; !exists {
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net := route.IPNet()
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nip := net.IP.Mask(net.Mask)
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nstr := fmt.Sprintf("%v/%d", nip, route.Bits)
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routeadd := []string{"route", "-q", "-n",
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"add", "-inet", nstr,
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"-iface", r.tunname}
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out, err := r.cmd(routeadd...).CombinedOutput()
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if err != nil {
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r.logf("addr add failed: %v: %v\n%s", routeadd, err, out)
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if errq == nil {
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errq = err
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}
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}
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}
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}
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// Store the interface and routes so we know what to change on an update.
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r.local = localAddr
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r.routes = newRoutes
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if err := r.replaceResolvConf(cfg.DNS, cfg.DNSDomains); err != nil {
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errq = fmt.Errorf("replacing resolv.conf failed: %v", err)
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}
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return errq
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}
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func (r *userspaceBSDRouter) Close() error {
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return nil
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}
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// TODO(mbaillie): these are no-ops for now. They could re-use the Linux funcs
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// (sans systemd parts), but I note Linux DNS is disabled(?) so leaving for now.
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func (r *userspaceBSDRouter) replaceResolvConf(_ []netaddr.IP, _ []string) error { return nil }
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func (r *userspaceBSDRouter) restoreResolvConf() error { return nil }
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