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18 commits

Author SHA1 Message Date
Jordan Whited
799c1978fa tun: add method for disabling TCP GRO on Linux 
torvalds/linux@e269d79c7d broke virtio_net
TCP & UDP GRO causing GRO writes to return EINVAL. The bug was then
resolved later in
torvalds/linux@89add40066. The offending
commit was pulled into various LTS releases.

Updates tailscale/tailscale#13041

Signed-off-by: Jordan Whited <jordan@tailscale.com>
 2024-09-05 09:18:24 -07:00
Jordan Whited
03c5a0ccf7 tun: implement API for disabling UDP GRO on Linux 
Certain device drivers (e.g. vxlan, geneve) do not properly handle
coalesced UDP packets later in the stack, resulting in packet loss.

Signed-off-by: Jordan Whited <jordan@tailscale.com>
 2024-04-29 11:54:44 -07:00
Jason A. Donenfeld
0ad14a89f5 global: buff -> buf 
This always struck me as kind of weird and non-standard.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
 2023-03-13 17:55:53 +01:00
Jordan Whited
3bb8fec7e4 conn, device, tun: implement vectorized I/O plumbing 
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>
 2023-03-10 14:52:13 +01:00
Jordan Whited
1e2c3e5a3c tun: guard Device.Events() against chan writes 
Signed-off-by: Jordan Whited <jordan@tailscale.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
 2023-02-09 12:35:58 -03:00
Jason A. Donenfeld
ebbd4a4330 global: bump copyright year 
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
 2023-02-07 20:39:29 -03:00
Jason A. Donenfeld
bb719d3a6e global: bump copyright year 
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
 2022-09-20 17:21:32 +02:00
Jason A. Donenfeld
d4112d9096 global: bump copyright 
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
 2021-01-28 17:52:15 +01:00
Jason A. Donenfeld
db0aa39b76 global: update header comments and modules 
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
 2020-05-02 02:08:26 -06:00
Matt Layher
1f48971a80 tun: remove TUN prefix from types to reduce stutter elsewhere 
Signed-off-by: Matt Layher <mdlayher@gmail.com>
 2019-06-14 18:35:57 +02:00
Jason A. Donenfeld
6440f010ee receive: implement flush semantics 2019-03-21 14:45:41 -06:00
Simon Rozman
91b4e909bb wintun: Use native Win32 API for I/O 
Signed-off-by: Simon Rozman <simon@rozman.si>
 2019-03-21 00:56:45 +01:00
Jason A. Donenfeld
967d1a0f3d tun: allow special methods in NativeTun 2019-03-01 00:05:57 +01:00
Jason A. Donenfeld
366cbd11a4 tun: use netpoll instead of rwcancel 
The new sysconn function of Go 1.12 makes this possible:

package main

import "log"
import "os"
import "unsafe"
import "time"
import "syscall"
import "sync"
import "golang.org/x/sys/unix"

func main() {
	fd, err := os.OpenFile("/dev/net/tun", os.O_RDWR, 0)
	if err != nil {
		log.Fatal(err)
	}

	var ifr [unix.IFNAMSIZ + 64]byte
	copy(ifr[:], []byte("cheese"))
	*(*uint16)(unsafe.Pointer(&ifr[unix.IFNAMSIZ])) = unix.IFF_TUN

	var errno syscall.Errno
	s, _ := fd.SyscallConn()
	s.Control(func(fd uintptr) {
		_, _, errno = unix.Syscall(
			unix.SYS_IOCTL,
			fd,
			uintptr(unix.TUNSETIFF),
			uintptr(unsafe.Pointer(&ifr[0])),
		)
	})
	if errno != 0 {
		log.Fatal(errno)
	}

	b := [4]byte{}
	wait := sync.WaitGroup{}
	wait.Add(1)
	go func() {
		_, err := fd.Read(b[:])
		log.Print("Read errored: ", err)
		wait.Done()
	}()
	time.Sleep(time.Second)
	log.Print("Closing")
	err = fd.Close()
	if err != nil {
		log.Print("Close errored: " , err)
	}
	wait.Wait()
	log.Print("Exiting")
}
 2019-02-27 01:52:55 +01:00
Jason A. Donenfeld
ab0f442daf tun: use sysconn instead of .Fd with Go 1.12 2019-02-27 01:34:11 +01:00
Jason A. Donenfeld
dff424baf8 Update copyright 2019-02-05 12:59:42 +01:00
Jason A. Donenfeld
5be541d147 global: fix up copyright headers 2018-09-16 18:49:19 +02:00
Jason A. Donenfeld
0a63188afa Move tun to subpackage 2018-05-23 03:58:27 +02:00