SchultesDev/wireguard-go
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conn, device, tun: implement vectorized I/O plumbing

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Accept packet vectors for reading and writing in the tun.Device and
conn.Bind interfaces, so that the internal plumbing between these
interfaces now passes a vector of packets. Vectors move untouched
between these interfaces, i.e. if 128 packets are received from
conn.Bind.Read(), 128 packets are passed to tun.Device.Write(). There is
no internal buffering.

Currently, existing implementations are only adjusted to have vectors
of length one. Subsequent patches will improve that.

Also, as a related fixup, use the unix and windows packages rather than
the syscall package when possible.

Co-authored-by: James Tucker <james@tailscale.com>
Signed-off-by: James Tucker <james@tailscale.com>
Signed-off-by: Jordan Whited <jordan@tailscale.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jordan Whited
2023-03-02 14:48:02 -08:00
committed by Jason A. Donenfeld
parent 21636207a6
commit 3bb8fec7e4
25 changed files with 1046 additions and 514 deletions
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39
tun/tun_linux.go
View File

@@ -323,12 +323,13 @@ func (tun *NativeTun) nameSlow() (string, error) {
return unix.ByteSliceToString(ifr[:]), nil
}
func (tun *NativeTun) Write(buf []byte, offset int) (int, error) {
func (tun *NativeTun) Write(buffs [][]byte, offset int) (n int, err error) {
var buf []byte
if tun.nopi {
buf = buf[offset:]
buf = buffs[0][offset:]
} else {
// reserve space for header
buf = buf[offset-4:]
buf = buffs[0][offset-4:]
// add packet information header
buf[0] = 0x00
@@ -342,34 +343,36 @@ func (tun *NativeTun) Write(buf []byte, offset int) (int, error) {
}
}
n, err := tun.tunFile.Write(buf)
_, err = tun.tunFile.Write(buf)
if errors.Is(err, syscall.EBADFD) {
err = os.ErrClosed
} else if err == nil {
n = 1
}
return n, err
}
func (tun *NativeTun) Flush() error {
// TODO: can flushing be implemented by buffering and using sendmmsg?
return nil
}
func (tun *NativeTun) Read(buf []byte, offset int) (n int, err error) {
func (tun *NativeTun) Read(buffs [][]byte, sizes []int, offset int) (n int, err error) {
select {
case err = <-tun.errors:
default:
if tun.nopi {
n, err = tun.tunFile.Read(buf[offset:])
sizes[0], err = tun.tunFile.Read(buffs[0][offset:])
if err == nil {
n = 1
}
} else {
buff := buf[offset-4:]
n, err = tun.tunFile.Read(buff[:])
buff := buffs[0][offset-4:]
sizes[0], err = tun.tunFile.Read(buff[:])
if errors.Is(err, syscall.EBADFD) {
err = os.ErrClosed
} else if err == nil {
n = 1
}
if n < 4 {
n = 0
if sizes[0] < 4 {
sizes[0] = 0
} else {
n -= 4
sizes[0] -= 4
}
}
}
@@ -399,6 +402,10 @@ func (tun *NativeTun) Close() error {
return err2
}
func (tun *NativeTun) BatchSize() int {
return 1
}
func CreateTUN(name string, mtu int) (Device, error) {
nfd, err := unix.Open(cloneDevicePath, unix.O_RDWR|unix.O_CLOEXEC, 0)
if err != nil {