feat: added basic structure around packet transfer

pcap-sys/src/lib.rs

@@ -450,6 +450,18 @@ impl<T: Activated> InterfaceStream<T> {
     pub fn sendpacket(&mut self, packet: packets::EthernetPkt) -> error::Result<()> {
         self.inner.get_mut().interface.sendpacket(packet)
     }
+
+    pub fn set_filter(
+        &mut self,
+        filter: &str,
+        optimize: bool,
+        mask: Option<u32>,
+    ) -> error::Result<Box<ffi::BpfProgram>> {
+        self.inner
+            .get_mut()
+            .interface
+            .set_filter(filter, optimize, mask)
+    }
 }
 
 impl<T: Activated> Unpin for InterfaceStream<T> {}