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Use nix ioctl macro for TUNSETOFF in mycelium-tun

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Signed-off-by: Lee Smet <lee.smet@hotmail.com>
This commit is contained in:
Lee Smet
2026-05-06 17:16:47 +02:00
parent d349f7026f
commit d454932913
1 changed files with 14 additions and 11 deletions
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mycelium-tun/src/linux.rs
+14 -11
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@@ -23,11 +23,11 @@ const TUNSETOFFLOAD: libc::c_ulong = 0x400454d0;
const IFF_VNET_HDR: libc::c_short = 0x4000;
// TUNSETOFFLOAD feature flags.
const TUN_F_CSUM: libc::c_ulong = 0x01;
const TUN_F_TSO4: libc::c_ulong = 0x02;
const TUN_F_TSO6: libc::c_ulong = 0x04;
const TUN_F_USO4: libc::c_ulong = 0x20;
const TUN_F_USO6: libc::c_ulong = 0x40;
const TUN_F_CSUM: libc::c_int = 0x01;
const TUN_F_TSO4: libc::c_int = 0x02;
const TUN_F_TSO6: libc::c_int = 0x04;
const TUN_F_USO4: libc::c_int = 0x20;
const TUN_F_USO6: libc::c_int = 0x40;
/// Maximum read buffer: 65535 (max IP packet) + 12 (virtio header).
const READ_BUF_SIZE: usize = 65535 + VIRTIO_NET_HDR_LEN;
@@ -39,6 +39,12 @@ nix::ioctl_write_ptr_bad!(
libc::ifreq
);
nix::ioctl_write_int_bad!(
/// Set TUN device offload features.
tunsetoffload,
TUNSETOFFLOAD
);
nix::ioctl_write_ptr_bad!(
/// Set the MTU on a network interface.
siocsifmtu,
@@ -131,17 +137,14 @@ impl Tun {
// Enable offloading: CSUM + TSO4 + TSO6 are mandatory.
let offload_flags = TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6;
// SAFETY: file is a valid TUN fd.
let ret = unsafe { libc::ioctl(file.as_raw_fd(), TUNSETOFFLOAD, offload_flags) };
if ret < 0 {
return Err(io::Error::last_os_error());
}
unsafe { tunsetoffload(file.as_raw_fd(), offload_flags) }.map_err(io::Error::from)?;
debug!(name = %actual_name, "enabled TSO offload");
// Attempt USO4/USO6 — requires Linux 6.2+. Failure is non-fatal.
let uso_flags = offload_flags | TUN_F_USO4 | TUN_F_USO6;
// SAFETY: file is a valid TUN fd.
let ret = unsafe { libc::ioctl(file.as_raw_fd(), TUNSETOFFLOAD, uso_flags) };
let uso_enabled = ret == 0;
let uso_enabled =
unsafe { tunsetoffload(file.as_raw_fd(), uso_flags) }.is_ok();
if uso_enabled {
debug!(name = %actual_name, "enabled USO offload");
}