Linux: Support for IFF_NAPI and IFF_VNET_HDR (#114)

* README: Correct name of required linux kernel module

I think a search and replace caught this when the crate name changed to tun2.

* linux: Support for IFF_NAPI

* linux: Support for IFF_VNET_HDR

* minor changes

---------

Co-authored-by: ssrlive <30760636+ssrlive@users.noreply.github.com>

src/platform/linux/device.rs

@@ -13,8 +13,8 @@
 // 0. You just DO WHAT THE FUCK YOU WANT TO.
 
 use libc::{
- self, c_char, c_short, ifreq, AF_INET, IFF_MULTI_QUEUE, IFF_NO_PI, IFF_RUNNING, IFF_TAP,
- IFF_TUN, IFF_UP, IFNAMSIZ, O_RDWR, SOCK_DGRAM,
+ self, c_char, c_short, ifreq, AF_INET, IFF_MULTI_QUEUE, IFF_NAPI, IFF_NO_PI, IFF_RUNNING,
+ IFF_TAP, IFF_TUN, IFF_UP, IFF_VNET_HDR, IFNAMSIZ, O_RDWR, SOCK_DGRAM,
 };
 use std::{
  ffi::{CStr, CString},
@@ -105,9 +105,15 @@ impl Device {
 
  let iff_no_pi = IFF_NO_PI as c_short;
  let iff_multi_queue = IFF_MULTI_QUEUE as c_short;
+ let iff_napi = IFF_NAPI as c_short;
+ let iff_vnet_hdr = IFF_VNET_HDR as c_short;
  let packet_information = config.platform_config.packet_information;
+ let napi = config.platform_config.napi;
+ let vnet_hdr = config.platform_config.vnet_hdr;
  req.ifr_ifru.ifru_flags = device_type
  | if packet_information { 0 } else { iff_no_pi }
+ | if napi { iff_napi } else { 0 }
+ | if vnet_hdr { iff_vnet_hdr } else { 0 }
  | if queues_num > 1 { iff_multi_queue } else { 0 };
 
  let tun_fd = {

src/platform/linux/mod.rs

@@ -29,6 +29,12 @@ pub struct PlatformConfig {
  pub(crate) packet_information: bool,
  /// root privileges required or not
  pub(crate) ensure_root_privileges: bool,
+
+ /// Enable IFF_NAPI
+ pub(crate) napi: bool,
+
+ /// Enable IFF_VNET_HDR
+ pub(crate) vnet_hdr: bool,
 }
 
 /// `packet_information` is default to be `false` and `ensure_root_privileges` is default to be `true`.
@@ -37,6 +43,8 @@ impl Default for PlatformConfig {
  PlatformConfig {
  packet_information: false,
  ensure_root_privileges: true,
+ napi: false,
+ vnet_hdr: false,
  }
  }
 }
@@ -61,6 +69,18 @@ impl PlatformConfig {
  self.ensure_root_privileges = value;
  self
  }
+
+ /// Enable IFF_NAPI flag.
+ pub fn napi(&mut self) -> &mut Self {
+ self.napi = true;
+ self
+ }
+
+ /// Enable IFF_VNET_HDR flag.
+ pub fn vnet_hdr(&mut self) -> &mut Self {
+ self.vnet_hdr = true;
+ self
+ }
 }
 
 /// Create a TUN device with the given name.