Added a definition for ethernet flow control packets.

pnet_packet/src/flowcontrol.rs

@@ -0,0 +1,67 @@
+// Copyright (c) 2023 Anson Mansfield <amansfield@mantaro.com>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Ethernet Flow Control \[IEEE 802.3x\] abstraction.
+
+use crate::PrimitiveValues;
+
+use alloc::vec::Vec;
+use core::fmt;
+
+use pnet_macros::packet;
+use pnet_macros_support::types::u16be;
+
+/// Represents the opcode field in an Ethernet Flow Control packet.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct FlowControlOpcode(pub u16);
+
+impl FlowControlOpcode {
+    pub fn new(value: u16) -> Self {
+        FlowControlOpcode(value)
+    }
+}
+impl PrimitiveValues for FlowControlOpcode {
+    type T = (u16,);
+    fn to_primitive_values(&self) -> (u16,) {
+        (self.0,)
+    }
+}
+impl fmt::Display for FlowControlOpcode {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f,
+            "{}",
+            match self {
+                &FlowControlOpcodes::Pause => "pause",
+                _ => "unknown",
+            })
+    }
+}
+
+/// Flow control opcodes are defined in IEEE 802.3x
+#[allow(non_snake_case)]
+#[allow(non_upper_case_globals)]
+pub mod FlowControlOpcodes {
+    use super::FlowControlOpcode;
+
+    /// Request the other station pause for 512*quanta bit times.
+    pub const Pause: FlowControlOpcode = FlowControlOpcode(1);
+}
+
+/// Represents an Ethernet Flow Control packet defined by IEEE 802.3x.
+/// ([wikipedia](https://en.wikipedia.org/wiki/Ethernet_flow_control))
+/// 
+/// Use with the [EtherTypes::FlowControl](crate::ethernet::EtherTypes::FlowControl) ethertype (0x8808).
+#[packet]
+#[allow(non_snake_case)]
+pub struct FlowControl {
+    #[construct_with(u16)]
+    pub command: FlowControlOpcode,
+    pub quanta: u16be,
+    #[payload]
+    pub payload: Vec<u8>,
+}

pnet_packet/src/lib.rs

@@ -26,6 +26,7 @@ pub use pnet_macros_support::packet::*;
 pub mod arp;
 pub mod dhcp;
 pub mod ethernet;
+pub mod flowcontrol;
 pub mod gre;
 pub mod icmp;
 pub mod icmpv6;