Update dependencies
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bluepython508
249
vendor/tailscale.com/wgengine/router/router_openbsd.go
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vendored
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249
vendor/tailscale.com/wgengine/router/router_openbsd.go
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// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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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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"net/netip"
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"os/exec"
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"github.com/tailscale/wireguard-go/tun"
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"go4.org/netipx"
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"tailscale.com/health"
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"tailscale.com/net/netmon"
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"tailscale.com/types/logger"
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"tailscale.com/util/set"
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)
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// For now this router only supports the WireGuard userspace implementation.
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// There is an experimental kernel version in the works for OpenBSD:
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// https://git.zx2c4.com/wireguard-openbsd.
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type openbsdRouter struct {
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logf logger.Logf
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netMon *netmon.Monitor
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tunname string
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local4 netip.Prefix
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local6 netip.Prefix
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routes set.Set[netip.Prefix]
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}
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func newUserspaceRouter(logf logger.Logf, tundev tun.Device, netMon *netmon.Monitor, health *health.Tracker) (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 &openbsdRouter{
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logf: logf,
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netMon: netMon,
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tunname: tunname,
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}, nil
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}
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func 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]", 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 *openbsdRouter) Up() error {
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ifup := []string{"ifconfig", r.tunname, "up"}
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if out, err := 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 inet(p netip.Prefix) string {
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if p.Addr().Is6() {
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return "inet6"
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}
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return "inet"
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}
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func (r *openbsdRouter) 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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// TODO: support configuring multiple local addrs on interface.
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if len(cfg.LocalAddrs) == 0 {
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return nil
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}
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numIPv4 := 0
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numIPv6 := 0
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localAddr4 := netip.Prefix{}
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localAddr6 := netip.Prefix{}
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for _, addr := range cfg.LocalAddrs {
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if addr.Addr().Is4() {
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numIPv4++
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localAddr4 = addr
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}
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if addr.Addr().Is6() {
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numIPv6++
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localAddr6 = addr
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}
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}
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if numIPv4 > 1 || numIPv6 > 1 {
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return errors.New("openbsd doesn't support setting multiple local addrs yet")
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}
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var errq error
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if localAddr4 != r.local4 {
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if r.local4.IsValid() {
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addrdel := []string{"ifconfig", r.tunname,
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"inet", r.local4.String(), "-alias"}
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out, err := 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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routedel := []string{"route", "-q", "-n",
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"del", "-inet", r.local4.String(),
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"-iface", r.local4.Addr().String()}
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if out, err := cmd(routedel...).CombinedOutput(); 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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if localAddr4.IsValid() {
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addradd := []string{"ifconfig", r.tunname,
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"inet", localAddr4.String(), "alias"}
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out, err := 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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routeadd := []string{"route", "-q", "-n",
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"add", "-inet", localAddr4.String(),
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"-iface", localAddr4.Addr().String()}
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if out, err := cmd(routeadd...).CombinedOutput(); err != nil {
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r.logf("route 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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if localAddr6.IsValid() {
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// in https://github.com/tailscale/tailscale/issues/1307 we made
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// FreeBSD use a /48 for IPv6 addresses, which is nice because we
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// don't need to additionally add routing entries. Do that here too.
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localAddr6 = netip.PrefixFrom(localAddr6.Addr(), 48)
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}
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if localAddr6 != r.local6 {
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if r.local6.IsValid() {
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addrdel := []string{"ifconfig", r.tunname,
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"inet6", r.local6.String(), "delete"}
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out, err := 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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if localAddr6.IsValid() {
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addradd := []string{"ifconfig", r.tunname,
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"inet6", localAddr6.String()}
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out, err := 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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}
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newRoutes := set.Set[netip.Prefix]{}
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for _, route := range cfg.Routes {
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newRoutes.Add(route)
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}
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for route := range r.routes {
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if _, keep := newRoutes[route]; !keep {
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net := netipx.PrefixIPNet(route)
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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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dst := localAddr4.Addr().String()
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if route.Addr().Is6() {
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dst = localAddr6.Addr().String()
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}
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routedel := []string{"route", "-q", "-n",
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"del", "-" + inet(route), nstr,
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"-iface", dst}
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out, err := 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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for route := range newRoutes {
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if _, exists := r.routes[route]; !exists {
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net := netipx.PrefixIPNet(route)
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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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dst := localAddr4.Addr().String()
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if route.Addr().Is6() {
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dst = localAddr6.Addr().String()
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}
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routeadd := []string{"route", "-q", "-n",
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"add", "-" + inet(route), nstr,
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"-iface", dst}
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out, err := 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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r.local4 = localAddr4
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r.local6 = localAddr6
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r.routes = newRoutes
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return errq
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}
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// UpdateMagicsockPort implements the Router interface. This implementation
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// does nothing and returns nil because this router does not currently need
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// to know what the magicsock UDP port is.
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func (r *openbsdRouter) UpdateMagicsockPort(_ uint16, _ string) error {
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return nil
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}
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func (r *openbsdRouter) Close() error {
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cleanUp(r.logf, r.tunname)
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return nil
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}
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func cleanUp(logf logger.Logf, interfaceName string) {
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out, err := cmd("ifconfig", interfaceName, "down").CombinedOutput()
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if err != nil {
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logf("ifconfig down: %v\n%s", err, out)
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}
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}
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