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https://github.com/ZeroTier/ZeroTierOne
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This commit is contained in:
Adam Ierymenko
parent
3b3e6d2bfc
commit
4303c43db7
13 changed files with 560 additions and 296 deletions
243
go/pkg/zerotier/nativetap.go
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243
go/pkg/zerotier/nativetap.go
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/*
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* Copyright (c)2019 ZeroTier, Inc.
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file in the project's root directory.
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*
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* Change Date: 2023-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2.0 of the Apache License.
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*/
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/****/
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package zerotier
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//#cgo CFLAGS: -O3
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//#include "../../native/GoGlue.h"
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import "C"
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import (
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"fmt"
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"net"
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"sync"
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"sync/atomic"
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"unsafe"
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)
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// nativeTap is a Tap implementation that wraps a native C++ interface to a system tun/tap device
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type nativeTap struct {
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tap unsafe.Pointer
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networkStatus uint32
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enabled uint32
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multicastGroupHandlers []func(bool, *MulticastGroup)
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multicastGroupHandlersLock sync.Mutex
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}
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// Close is a no-op for the native tap because GoGlue does this when networks are left
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func (t *nativeTap) Close() {}
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// Type returns a human-readable description of this tap implementation
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func (t *nativeTap) Type() string {
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return "native"
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}
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// Error gets this tap device's error status
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func (t *nativeTap) Error() (int, string) {
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return 0, ""
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}
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// SetEnabled sets this tap's enabled state
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func (t *nativeTap) SetEnabled(enabled bool) {
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if enabled && atomic.SwapUint32(&t.enabled, 1) == 0 {
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C.ZT_GoTap_setEnabled(t.tap, 1)
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} else if !enabled && atomic.SwapUint32(&t.enabled, 0) == 1 {
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C.ZT_GoTap_setEnabled(t.tap, 0)
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}
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}
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// Enabled returns true if this tap is currently processing packets
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func (t *nativeTap) Enabled() bool {
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return atomic.LoadUint32(&t.enabled) != 0
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}
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// AddIP adds an IP address (with netmask) to this tap
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func (t *nativeTap) AddIP(ip *net.IPNet) error {
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bits, _ := ip.Mask.Size()
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if len(ip.IP) == 16 {
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if bits > 128 || bits < 0 {
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return ErrInvalidParameter
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}
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C.ZT_GoTap_addIp(t.tap, C.int(AFInet6), unsafe.Pointer(&ip.IP[0]), C.int(bits))
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} else if len(ip.IP) == 4 {
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if bits > 32 || bits < 0 {
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return ErrInvalidParameter
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}
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C.ZT_GoTap_addIp(t.tap, C.int(AFInet), unsafe.Pointer(&ip.IP[0]), C.int(bits))
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}
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return ErrInvalidParameter
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}
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// RemoveIP removes this IP address (with netmask) from this tap
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func (t *nativeTap) RemoveIP(ip *net.IPNet) error {
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bits, _ := ip.Mask.Size()
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if len(ip.IP) == 16 {
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if bits > 128 || bits < 0 {
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return ErrInvalidParameter
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}
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C.ZT_GoTap_removeIp(t.tap, C.int(AFInet6), unsafe.Pointer(&ip.IP[0]), C.int(bits))
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return nil
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}
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if len(ip.IP) == 4 {
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if bits > 32 || bits < 0 {
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return ErrInvalidParameter
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}
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C.ZT_GoTap_removeIp(t.tap, C.int(AFInet), unsafe.Pointer(&ip.IP[0]), C.int(bits))
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return nil
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}
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return ErrInvalidParameter
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}
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// IPs returns IPs currently assigned to this tap (including externally or system-assigned IPs)
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func (t *nativeTap) IPs() (ips []net.IPNet, err error) {
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defer func() {
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e := recover()
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if e != nil {
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err = fmt.Errorf("%v", e)
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}
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}()
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var ipbuf [16384]byte
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count := int(C.ZT_GoTap_ips(t.tap, unsafe.Pointer(&ipbuf[0]), 16384))
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ipptr := 0
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for i := 0; i < count; i++ {
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af := int(ipbuf[ipptr])
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ipptr++
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switch af {
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case AFInet:
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var ip [4]byte
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for j := 0; j < 4; j++ {
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ip[j] = ipbuf[ipptr]
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ipptr++
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}
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bits := ipbuf[ipptr]
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ipptr++
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ips = append(ips, net.IPNet{IP: net.IP(ip[:]), Mask: net.CIDRMask(int(bits), 32)})
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case AFInet6:
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var ip [16]byte
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for j := 0; j < 16; j++ {
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ip[j] = ipbuf[ipptr]
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ipptr++
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}
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bits := ipbuf[ipptr]
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ipptr++
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ips = append(ips, net.IPNet{IP: net.IP(ip[:]), Mask: net.CIDRMask(int(bits), 128)})
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}
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}
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return
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}
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// DeviceName gets this tap's OS-specific device name
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func (t *nativeTap) DeviceName() string {
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var dn [256]byte
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C.ZT_GoTap_deviceName(t.tap, (*C.char)(unsafe.Pointer(&dn[0])))
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for i, b := range dn {
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if b == 0 {
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return string(dn[0:i])
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}
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}
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return ""
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}
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// AddMulticastGroupChangeHandler adds a function to be called when the tap subscribes or unsubscribes to a multicast group.
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func (t *nativeTap) AddMulticastGroupChangeHandler(handler func(bool, *MulticastGroup)) {
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t.multicastGroupHandlersLock.Lock()
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t.multicastGroupHandlers = append(t.multicastGroupHandlers, handler)
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t.multicastGroupHandlersLock.Unlock()
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}
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// AddRoute adds or updates a managed route on this tap's interface
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func (t *nativeTap) AddRoute(r *Route) error {
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rc := 0
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if r != nil {
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if len(r.Target.IP) == 4 {
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mask, _ := r.Target.Mask.Size()
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if len(r.Via) == 4 {
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rc = int(C.ZT_GoTap_addRoute(t.tap, AFInet, unsafe.Pointer(&r.Target.IP[0]), C.int(mask), AFInet, unsafe.Pointer(&r.Via[0]), C.uint(r.Metric)))
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} else {
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rc = int(C.ZT_GoTap_addRoute(t.tap, AFInet, unsafe.Pointer(&r.Target.IP[0]), C.int(mask), 0, nil, C.uint(r.Metric)))
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}
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} else if len(r.Target.IP) == 16 {
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mask, _ := r.Target.Mask.Size()
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if len(r.Via) == 4 {
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rc = int(C.ZT_GoTap_addRoute(t.tap, AFInet6, unsafe.Pointer(&r.Target.IP[0]), C.int(mask), AFInet6, unsafe.Pointer(&r.Via[0]), C.uint(r.Metric)))
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} else {
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rc = int(C.ZT_GoTap_addRoute(t.tap, AFInet6, unsafe.Pointer(&r.Target.IP[0]), C.int(mask), 0, nil, C.uint(r.Metric)))
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}
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}
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}
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if rc != 0 {
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return fmt.Errorf("tap device error adding route: %d", rc)
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}
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return nil
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}
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// RemoveRoute removes a managed route on this tap's interface
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func (t *nativeTap) RemoveRoute(r *Route) error {
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rc := 0
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if r != nil {
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if len(r.Target.IP) == 4 {
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mask, _ := r.Target.Mask.Size()
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if len(r.Via) == 4 {
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rc = int(C.ZT_GoTap_removeRoute(t.tap, AFInet, unsafe.Pointer(&r.Target.IP[0]), C.int(mask), AFInet, unsafe.Pointer(&r.Via[0]), C.uint(r.Metric)))
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} else {
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rc = int(C.ZT_GoTap_removeRoute(t.tap, AFInet, unsafe.Pointer(&r.Target.IP[0]), C.int(mask), 0, nil, C.uint(r.Metric)))
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}
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} else if len(r.Target.IP) == 16 {
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mask, _ := r.Target.Mask.Size()
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if len(r.Via) == 4 {
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rc = int(C.ZT_GoTap_removeRoute(t.tap, AFInet6, unsafe.Pointer(&r.Target.IP[0]), C.int(mask), AFInet6, unsafe.Pointer(&r.Via[0]), C.uint(r.Metric)))
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} else {
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rc = int(C.ZT_GoTap_removeRoute(t.tap, AFInet6, unsafe.Pointer(&r.Target.IP[0]), C.int(mask), 0, nil, C.uint(r.Metric)))
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}
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}
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}
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if rc != 0 {
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return fmt.Errorf("tap device error removing route: %d", rc)
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}
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return nil
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}
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func handleTapMulticastGroupChange(gn unsafe.Pointer, nwid, mac C.uint64_t, adi C.uint32_t, added bool) {
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go func() {
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nodesByUserPtrLock.RLock()
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node := nodesByUserPtr[uintptr(gn)]
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nodesByUserPtrLock.RUnlock()
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if node == nil {
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return
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}
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node.networksLock.RLock()
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network := node.networks[NetworkID(nwid)]
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node.networksLock.RUnlock()
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if network != nil {
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tap, _ := network.tap.(*nativeTap)
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if tap != nil {
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mg := &MulticastGroup{MAC: MAC(mac), ADI: uint32(adi)}
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tap.multicastGroupHandlersLock.Lock()
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defer tap.multicastGroupHandlersLock.Unlock()
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for _, h := range tap.multicastGroupHandlers {
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h(added, mg)
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}
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}
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}
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}()
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}
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//export goHandleTapAddedMulticastGroup
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func goHandleTapAddedMulticastGroup(gn, tapP unsafe.Pointer, nwid, mac C.uint64_t, adi C.uint32_t) {
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handleTapMulticastGroupChange(gn, nwid, mac, adi, true)
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}
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//export goHandleTapRemovedMulticastGroup
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func goHandleTapRemovedMulticastGroup(gn, tapP unsafe.Pointer, nwid, mac C.uint64_t, adi C.uint32_t) {
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handleTapMulticastGroupChange(gn, nwid, mac, adi, false)
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}
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