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wgengine/magicsock: simplify tryEnableUDPOffload() (#9872) 

Don't assume Linux lacks UDP_GRO support if it lacks UDP_SEGMENT
support. This mirrors a similar change in wireguard/wireguard-go@177caa7
for consistency sake. We haven't found any issues here, just being
overly paranoid.

Updates #cleanup

Signed-off-by: Jordan Whited <jordan@tailscale.com>
This commit is contained in:
Jordan Whited 2023-10-18 18:50:40 -07:00 committed by GitHub
parent d603d18956
commit 891d964bd4
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1 changed files with 1 additions and 5 deletions
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6
wgengine/magicsock/magicsock_linux.go
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@ -328,11 +328,7 @@ func tryEnableUDPOffload(pconn nettype.PacketConn) (hasTX bool, hasRX bool) {
}
err = rc.Control(func(fd uintptr) {
_, errSyscall := syscall.GetsockoptInt(int(fd), unix.IPPROTO_UDP, unix.UDP_SEGMENT)
if errSyscall != nil {
// no point in checking RX, TX support was added first.
return
}
hasTX = true
hasTX = errSyscall == nil
errSyscall = syscall.SetsockoptInt(int(fd), unix.IPPROTO_UDP, unix.UDP_GRO, 1)
hasRX = errSyscall == nil
})