Merge #853

853: Update `InterfaceFlags` r=Susurrus a=LuoZijun

Add Flags: `IFF_NO_PI`, `IFF_TUN`, `IFF_TAP`.

CHANGELOG.md

@@ -8,8 +8,9 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 ### Added
 - Added `getsid` in `::nix::unistd`
   ([#850](https://github.com/nix-rust/nix/pull/850))
-
 - Added `alarm`. ([#830](https://github.com/nix-rust/nix/pull/830))
+- Added interface flags `IFF_NO_PI, IFF_TUN, IFF_TAP` on linux-like systems.
+  ([#853](https://github.com/nix-rust/nix/pull/853))
 
 ### Changed
 - Display and Debug for SysControlAddr now includes all fields.

src/net/if_.rs

@@ -215,6 +215,15 @@ libc_bitflags!(
         /// Don't exchange routing info.
         #[cfg(any(target_os = "solaris"))]
         IFF_NORTEXCH;
+        /// Do not provide packet information
+        #[cfg(any(target_os = "android", target_os = "fuchsia", target_os = "linux"))]
+        IFF_NO_PI as libc::c_int;
+        /// TUN device (no Ethernet headers) 
+        #[cfg(any(target_os = "android", target_os = "fuchsia", target_os = "linux"))]
+        IFF_TUN as libc::c_int;
+        /// TAP device
+        #[cfg(any(target_os = "android", target_os = "fuchsia", target_os = "linux"))]
+        IFF_TAP as libc::c_int;
         /// IPv4 interface.
         #[cfg(any(target_os = "solaris"))]
         IFF_IPV4;