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Diffstat (limited to 'tun/tun_freebsd.go')
-rw-r--r--tun/tun_freebsd.go232
1 files changed, 66 insertions, 166 deletions
diff --git a/tun/tun_freebsd.go b/tun/tun_freebsd.go
index e618be3..53d4f41 100644
--- a/tun/tun_freebsd.go
+++ b/tun/tun_freebsd.go
@@ -14,7 +14,6 @@ import (
"syscall"
"unsafe"
- "golang.org/x/net/ipv6"
"golang.org/x/sys/unix"
)
@@ -22,43 +21,35 @@ const (
_TUNSIFHEAD = 0x80047460
_TUNSIFMODE = 0x8004745e
_TUNGIFNAME = 0x4020745d
-)
-// TODO: move into x/sys/unix
-const (
- SIOCGIFINFO_IN6 = 0xc048696c
- SIOCSIFINFO_IN6 = 0xc048696d
- ND6_IFF_AUTO_LINKLOCAL = 0x20
- ND6_IFF_NO_DAD = 0x100
+ _SIOCGIFINFO_IN6 = 0xc048696c
+ _SIOCSIFINFO_IN6 = 0xc048696d
+ _ND6_IFF_AUTO_LINKLOCAL = 0x20
+ _ND6_IFF_NO_DAD = 0x100
)
-// Iface status string max len
-const _IFSTATMAX = 800
-
-const SIZEOF_UINTPTR = 4 << (^uintptr(0) >> 32 & 1)
-
-// structure for iface requests for just the name
-type ifreq_name struct {
+// Iface requests with just the name
+type ifreqName struct {
Name [unix.IFNAMSIZ]byte
- Pad0 [16]byte
+ _ [16]byte
}
-// structure for iface requests with a pointer
-type ifreq_ptr struct {
+// Iface requests with a pointer
+type ifreqPtr struct {
Name [unix.IFNAMSIZ]byte
Data uintptr
- Pad0 [16 - SIZEOF_UINTPTR]byte
+ _ [16 - unsafe.Sizeof(uintptr(0))]byte
}
-// Structure for iface mtu get/set ioctls
-type ifreq_mtu struct {
+// Iface requests with MTU
+type ifreqMtu struct {
Name [unix.IFNAMSIZ]byte
MTU uint32
- Pad0 [12]byte
+ _ [12]byte
}
-// Structures for nd6 flag manipulation
-type in6_ndireq struct {
+// ND6 flag manipulation
+type nd6Req struct {
Name [unix.IFNAMSIZ]byte
Linkmtu uint32
Maxmtu uint32
@@ -96,7 +87,7 @@ func (tun *NativeTun) routineRouteListener(tunIfindex int) {
retry:
n, err := unix.Read(tun.routeSocket, data)
if err != nil {
- if errno, ok := err.(syscall.Errno); ok && errno == syscall.EINTR {
+ if errors.Is(err, syscall.EINTR) {
goto retry
}
tun.errors <- err
@@ -140,7 +131,7 @@ func (tun *NativeTun) routineRouteListener(tunIfindex int) {
}
func tunName(fd uintptr) (string, error) {
- var ifreq ifreq_name
+ var ifreq ifreqName
_, _, err := unix.Syscall(unix.SYS_IOCTL, fd, _TUNGIFNAME, uintptr(unsafe.Pointer(&ifreq)))
if err != 0 {
return "", err
@@ -150,13 +141,7 @@ func tunName(fd uintptr) (string, error) {
// Destroy a named system interface
func tunDestroy(name string) error {
- // Open control socket.
- var fd int
- fd, err := unix.Socket(
- unix.AF_INET,
- unix.SOCK_DGRAM,
- 0,
- )
+ fd, err := unix.Socket(unix.AF_INET, unix.SOCK_DGRAM, 0)
if err != nil {
return err
}
@@ -164,14 +149,9 @@ func tunDestroy(name string) error {
var ifr [32]byte
copy(ifr[:], name)
- _, _, errno := unix.Syscall(
- unix.SYS_IOCTL,
- uintptr(fd),
- uintptr(unix.SIOCIFDESTROY),
- uintptr(unsafe.Pointer(&ifr[0])),
- )
+ _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(fd), uintptr(unix.SIOCIFDESTROY), uintptr(unsafe.Pointer(&ifr[0])))
if errno != 0 {
- return fmt.Errorf("failed to destroy interface %s: %s", name, errno.Error())
+ return fmt.Errorf("failed to destroy interface %s: %w", name, errno)
}
return nil
@@ -207,104 +187,68 @@ func CreateTUN(name string, mtu int) (Device, error) {
ifheadmode := 1
var errno syscall.Errno
tun.operateOnFd(func(fd uintptr) {
- _, _, errno = unix.Syscall(
- unix.SYS_IOCTL,
- fd,
- uintptr(_TUNSIFHEAD),
- uintptr(unsafe.Pointer(&ifheadmode)),
- )
+ _, _, errno = unix.Syscall(unix.SYS_IOCTL, fd, _TUNSIFHEAD, uintptr(unsafe.Pointer(&ifheadmode)))
})
if errno != 0 {
tunFile.Close()
tunDestroy(assignedName)
- return nil, fmt.Errorf("Unable to put into IFHEAD mode: %w", errno)
+ return nil, fmt.Errorf("unable to put into IFHEAD mode: %w", errno)
}
- // Get out of PPP mode.
+ // Get out of PTP mode.
ifflags := syscall.IFF_BROADCAST | syscall.IFF_MULTICAST
tun.operateOnFd(func(fd uintptr) {
- _, _, errno = unix.Syscall(
- unix.SYS_IOCTL,
- fd,
- uintptr(_TUNSIFMODE),
- uintptr(unsafe.Pointer(&ifflags)),
- )
+ _, _, errno = unix.Syscall(unix.SYS_IOCTL, fd, uintptr(_TUNSIFMODE), uintptr(unsafe.Pointer(&ifflags)))
})
if errno != 0 {
tunFile.Close()
tunDestroy(assignedName)
- return nil, fmt.Errorf("Unable to put into IFF_BROADCAST mode: %w", errno)
+ return nil, fmt.Errorf("unable to put into IFF_BROADCAST mode: %w", errno)
}
- // Open control sockets
- confd, err := unix.Socket(
- unix.AF_INET,
- unix.SOCK_DGRAM,
- 0,
- )
- if err != nil {
- tunFile.Close()
- tunDestroy(assignedName)
- return nil, err
- }
- defer unix.Close(confd)
- confd6, err := unix.Socket(
- unix.AF_INET6,
- unix.SOCK_DGRAM,
- 0,
- )
+ // Disable link-local v6, not just because WireGuard doesn't do that anyway, but
+ // also because there are serious races with attaching and detaching LLv6 addresses
+ // in relation to interface lifetime within the FreeBSD kernel.
+ confd6, err := unix.Socket(unix.AF_INET6, unix.SOCK_DGRAM, 0)
if err != nil {
tunFile.Close()
tunDestroy(assignedName)
return nil, err
}
defer unix.Close(confd6)
-
- // Disable link-local v6, not just because WireGuard doesn't do that anyway, but
- // also because there are serious races with attaching and detaching LLv6 addresses
- // in relation to interface lifetime within the FreeBSD kernel.
- var ndireq in6_ndireq
+ var ndireq nd6Req
copy(ndireq.Name[:], assignedName)
- _, _, errno = unix.Syscall(
- unix.SYS_IOCTL,
- uintptr(confd6),
- uintptr(SIOCGIFINFO_IN6),
- uintptr(unsafe.Pointer(&ndireq)),
- )
+ _, _, errno = unix.Syscall(unix.SYS_IOCTL, uintptr(confd6), uintptr(_SIOCGIFINFO_IN6), uintptr(unsafe.Pointer(&ndireq)))
if errno != 0 {
tunFile.Close()
tunDestroy(assignedName)
- return nil, fmt.Errorf("Unable to get nd6 flags for %s: %w", assignedName, errno)
+ return nil, fmt.Errorf("unable to get nd6 flags for %s: %w", assignedName, errno)
}
- ndireq.Flags = ndireq.Flags &^ ND6_IFF_AUTO_LINKLOCAL
- ndireq.Flags = ndireq.Flags | ND6_IFF_NO_DAD
- _, _, errno = unix.Syscall(
- unix.SYS_IOCTL,
- uintptr(confd6),
- uintptr(SIOCSIFINFO_IN6),
- uintptr(unsafe.Pointer(&ndireq)),
- )
+ ndireq.Flags = ndireq.Flags &^ _ND6_IFF_AUTO_LINKLOCAL
+ ndireq.Flags = ndireq.Flags | _ND6_IFF_NO_DAD
+ _, _, errno = unix.Syscall(unix.SYS_IOCTL, uintptr(confd6), uintptr(_SIOCSIFINFO_IN6), uintptr(unsafe.Pointer(&ndireq)))
if errno != 0 {
tunFile.Close()
tunDestroy(assignedName)
- return nil, fmt.Errorf("Unable to set nd6 flags for %s: %w", assignedName, errno)
+ return nil, fmt.Errorf("unable to set nd6 flags for %s: %w", assignedName, errno)
}
if name != "" {
- // Rename the interface
+ confd, err := unix.Socket(unix.AF_INET, unix.SOCK_DGRAM, 0)
+ if err != nil {
+ tunFile.Close()
+ tunDestroy(assignedName)
+ return nil, err
+ }
+ defer unix.Close(confd)
var newnp [unix.IFNAMSIZ]byte
copy(newnp[:], name)
- var ifr ifreq_ptr
+ var ifr ifreqPtr
copy(ifr.Name[:], assignedName)
ifr.Data = uintptr(unsafe.Pointer(&newnp[0]))
- _, _, errno = unix.Syscall(
- unix.SYS_IOCTL,
- uintptr(confd),
- uintptr(unix.SIOCSIFNAME),
- uintptr(unsafe.Pointer(&ifr)),
- )
+ _, _, errno = unix.Syscall(unix.SYS_IOCTL, uintptr(confd), uintptr(unix.SIOCSIFNAME), uintptr(unsafe.Pointer(&ifr)))
if errno != 0 {
tunFile.Close()
tunDestroy(assignedName)
@@ -316,7 +260,6 @@ func CreateTUN(name string, mtu int) (Device, error) {
}
func CreateTUNFromFile(file *os.File, mtu int) (Device, error) {
-
tun := &NativeTun{
tunFile: file,
events: make(chan Event, 10),
@@ -393,27 +336,20 @@ func (tun *NativeTun) Read(buff []byte, offset int) (int, error) {
}
}
-func (tun *NativeTun) Write(buff []byte, offset int) (int, error) {
-
- // reserve space for header
-
- buff = buff[offset-4:]
-
- // add packet information header
-
- buff[0] = 0x00
- buff[1] = 0x00
- buff[2] = 0x00
-
- if buff[4]>>4 == ipv6.Version {
- buff[3] = unix.AF_INET6
- } else {
- buff[3] = unix.AF_INET
+func (tun *NativeTun) Write(buf []byte, offset int) (int, error) {
+ buf = buf[offset-4:]
+ buf[0] = 0x00
+ buf[1] = 0x00
+ buf[2] = 0x00
+ switch buf[4] >> 4 {
+ case 4:
+ buf[3] = unix.AF_INET
+ case 6:
+ buf[3] = unix.AF_INET6
+ default:
+ return 0, unix.EAFNOSUPPORT
}
-
- // write
-
- return tun.tunFile.Write(buff)
+ return tun.tunFile.Write(buf)
}
func (tun *NativeTun) Flush() error {
@@ -444,70 +380,34 @@ func (tun *NativeTun) Close() error {
}
func (tun *NativeTun) setMTU(n int) error {
- // open datagram socket
-
- var fd int
-
- fd, err := unix.Socket(
- unix.AF_INET,
- unix.SOCK_DGRAM,
- 0,
- )
-
+ fd, err := unix.Socket(unix.AF_INET, unix.SOCK_DGRAM, 0)
if err != nil {
return err
}
-
defer unix.Close(fd)
- // do ioctl call
-
- var ifr ifreq_mtu
+ var ifr ifreqMtu
copy(ifr.Name[:], tun.name)
ifr.MTU = uint32(n)
-
- _, _, errno := unix.Syscall(
- unix.SYS_IOCTL,
- uintptr(fd),
- uintptr(unix.SIOCSIFMTU),
- uintptr(unsafe.Pointer(&ifr)),
- )
-
+ _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(fd), uintptr(unix.SIOCSIFMTU), uintptr(unsafe.Pointer(&ifr)))
if errno != 0 {
- return fmt.Errorf("failed to set MTU on %s", tun.name)
+ return fmt.Errorf("failed to set MTU on %s: %w", tun.name, errno)
}
-
return nil
}
func (tun *NativeTun) MTU() (int, error) {
- // open datagram socket
-
- fd, err := unix.Socket(
- unix.AF_INET,
- unix.SOCK_DGRAM,
- 0,
- )
-
+ fd, err := unix.Socket(unix.AF_INET, unix.SOCK_DGRAM, 0)
if err != nil {
return 0, err
}
-
defer unix.Close(fd)
- // do ioctl call
- var ifr ifreq_mtu
+ var ifr ifreqMtu
copy(ifr.Name[:], tun.name)
-
- _, _, errno := unix.Syscall(
- unix.SYS_IOCTL,
- uintptr(fd),
- uintptr(unix.SIOCGIFMTU),
- uintptr(unsafe.Pointer(&ifr)),
- )
+ _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(fd), uintptr(unix.SIOCGIFMTU), uintptr(unsafe.Pointer(&ifr)))
if errno != 0 {
- return 0, fmt.Errorf("failed to get MTU on %s", tun.name)
+ return 0, fmt.Errorf("failed to get MTU on %s: %w", tun.name, errno)
}
-
return int(*(*int32)(unsafe.Pointer(&ifr.MTU))), nil
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 06:54:36 +0000