mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-26 11:35:35 +00:00
85 lines
2.2 KiB
Go
85 lines
2.2 KiB
Go
// Copyright (c) 2021 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,redo ios,redo
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package ipnlocal
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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"
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"strings"
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"syscall"
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"golang.org/x/sys/unix"
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"inet.af/netaddr"
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"tailscale.com/net/interfaces"
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)
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func init() {
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initListenConfig = initListenConfigNetworkExtension
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peerDialControlFunc = peerDialControlFuncNetworkExtension
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}
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// initListenConfigNetworkExtension configures nc for listening on IP
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// through the iOS/macOS Network/System Extension (Packet Tunnel
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// Provider) sandbox.
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func initListenConfigNetworkExtension(nc *net.ListenConfig, ip netaddr.IP, st *interfaces.State, tunIfName string) error {
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tunIf, ok := st.Interface[tunIfName]
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if !ok {
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return fmt.Errorf("no interface with name %q", tunIfName)
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}
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nc.Control = func(network, address string, c syscall.RawConn) error {
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var sockErr error
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err := c.Control(func(fd uintptr) {
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sockErr = bindIf(fd, network, address, tunIf.Index)
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log.Printf("peerapi: bind(%q, %q) on index %v = %v", network, address, tunIf.Index, sockErr)
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})
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if err != nil {
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return err
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}
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return sockErr
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}
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return nil
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}
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func bindIf(fd uintptr, network, address string, ifIndex int) error {
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v6 := strings.Contains(address, "]:") || strings.HasSuffix(network, "6") // hacky test for v6
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proto := unix.IPPROTO_IP
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opt := unix.IP_BOUND_IF
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if v6 {
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proto = unix.IPPROTO_IPV6
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opt = unix.IPV6_BOUND_IF
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}
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return unix.SetsockoptInt(int(fd), proto, opt, ifIndex)
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}
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func peerDialControlFuncNetworkExtension(b *LocalBackend) func(network, address string, c syscall.RawConn) error {
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b.mu.Lock()
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defer b.mu.Unlock()
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st := b.prevIfState
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pas := b.peerAPIServer
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index := -1
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if st != nil && pas != nil && pas.tunName != "" {
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if tunIf, ok := st.Interface[pas.tunName]; ok {
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index = tunIf.Index
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}
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}
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return func(network, address string, c syscall.RawConn) error {
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if index == -1 {
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return errors.New("failed to find TUN interface to bind to")
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}
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var sockErr error
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err := c.Control(func(fd uintptr) {
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sockErr = bindIf(fd, network, address, index)
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})
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if err != nil {
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return err
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}
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return sockErr
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}
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}
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