Implement Ethernet II frame support.
commit
c638f45373
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@ -0,0 +1,2 @@
|
|||
target
|
||||
Cargo.lock
|
|
@ -0,0 +1,7 @@
|
|||
[package]
|
||||
name = "smoltcp"
|
||||
version = "0.1.0"
|
||||
authors = ["whitequark <whitequark@whitequark.org>"]
|
||||
|
||||
[dependencies]
|
||||
byteorder = { version = "0.5", default-features = false }
|
|
@ -0,0 +1,201 @@
|
|||
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@ -0,0 +1,63 @@
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smoltcp
|
||||
=======
|
||||
|
||||
_smoltcp_ is a standalone, event-driven TCP/IP stack that is designed for bare-metal,
|
||||
real-time systems. Its design goals are simplicity and robustness. Its design anti-goals
|
||||
include complicated compile-time computations, such as macro or type tricks, even
|
||||
at cost of performance degradation.
|
||||
|
||||
Features
|
||||
--------
|
||||
|
||||
_smoltcp_ is missing many widely deployed features, whether by design or simply because
|
||||
no one implemented them yet. To set expectations right, both implemented and omitted
|
||||
features are listed.
|
||||
|
||||
### Media layer
|
||||
|
||||
The only supported medium is Ethernet.
|
||||
|
||||
* Regular 802.3 frames are supported.
|
||||
* 802.1Q is not supported.
|
||||
* Jumbo frames are not supported.
|
||||
* CRC calculation is not supported.
|
||||
* ARP packets are not supported.
|
||||
* ARP probes or announcements are not supported.
|
||||
|
||||
### IP layer
|
||||
|
||||
IP is not supported yet.
|
||||
|
||||
### UDP layer
|
||||
|
||||
UDP is not supported yet.
|
||||
|
||||
### TCP layer
|
||||
|
||||
TCP is not supported yet.
|
||||
|
||||
Installation
|
||||
------------
|
||||
|
||||
To use the _smoltcp_ library in your project, add the following to `Cargo.toml`:
|
||||
|
||||
```toml
|
||||
[dependencies]
|
||||
smoltcp = "0.1"
|
||||
```
|
||||
|
||||
Usage example
|
||||
-------------
|
||||
|
||||
```rust
|
||||
TBD
|
||||
```
|
||||
|
||||
License
|
||||
-------
|
||||
|
||||
_smoltcp_ is distributed under the terms of both the MIT license
|
||||
and the Apache License (Version 2.0).
|
||||
|
||||
See [LICENSE-APACHE](LICENSE-APACHE) and [LICENSE-MIT](LICENSE-MIT)
|
||||
for details.
|
|
@ -0,0 +1,175 @@
|
|||
use core::fmt;
|
||||
use byteorder::{ByteOrder, NetworkEndian};
|
||||
|
||||
enum_with_unknown! {
|
||||
/// Ethernet protocol type.
|
||||
pub enum ProtocolType(u16) {
|
||||
Ipv4 = 0x0800,
|
||||
Arp = 0x0806,
|
||||
Iv6 = 0x86DD
|
||||
}
|
||||
}
|
||||
|
||||
/// A six-octet Ethernet II address.
|
||||
#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Clone, Copy)]
|
||||
pub struct Address(pub [u8; 6]);
|
||||
|
||||
impl Address {
|
||||
/// Construct an Ethernet address from a sequence of octets, in big-endian.
|
||||
///
|
||||
/// # Panics
|
||||
/// The function panics if `data` is not six octets long.
|
||||
pub fn from_bytes(data: &[u8]) -> Address {
|
||||
let mut bytes = [0; 6];
|
||||
bytes.copy_from_slice(data);
|
||||
Address(bytes)
|
||||
}
|
||||
|
||||
/// Return an Ethernet address as a sequence of octets, in big-endian.
|
||||
pub fn as_bytes(&self) -> &[u8] {
|
||||
&self.0
|
||||
}
|
||||
}
|
||||
|
||||
impl fmt::Display for Address {
|
||||
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
||||
let bytes = self.0;
|
||||
write!(f, "{:02x}:{:02x}:{:02x}:{:02x}:{:02x}:{:02x}",
|
||||
bytes[0], bytes[1], bytes[2], bytes[3], bytes[4], bytes[5])
|
||||
}
|
||||
}
|
||||
|
||||
/// A read/write wrapper around an Ethernet II frame.
|
||||
#[derive(Debug)]
|
||||
pub struct Frame<T: AsRef<[u8]>>(T);
|
||||
|
||||
mod field {
|
||||
use ::field::*;
|
||||
|
||||
pub const SOURCE: Field = 0..6;
|
||||
pub const DESTINATION: Field = 6..12;
|
||||
pub const LENGTH: Field = 12..14;
|
||||
pub const PAYLOAD: FieldFrom = 14..;
|
||||
}
|
||||
|
||||
impl<T: AsRef<[u8]>> Frame<T> {
|
||||
/// Wrap a buffer with an Ethernet frame. Returns an error if the buffer
|
||||
/// is too small or too large to contain one.
|
||||
pub fn new(storage: T) -> Result<Frame<T>, ()> {
|
||||
let len = storage.as_ref().len();
|
||||
if !(64..1518).contains(len) {
|
||||
Err(()) // TODO: error type?
|
||||
} else {
|
||||
Ok(Frame(storage))
|
||||
}
|
||||
}
|
||||
|
||||
/// Consumes the frame, returning the underlying buffer.
|
||||
pub fn into_inner(self) -> T {
|
||||
self.0
|
||||
}
|
||||
|
||||
/// Return the source address field.
|
||||
#[inline(always)]
|
||||
pub fn source(&self) -> Address {
|
||||
let bytes = self.0.as_ref();
|
||||
Address::from_bytes(&bytes[field::SOURCE])
|
||||
}
|
||||
|
||||
/// Return the destination address field.
|
||||
#[inline(always)]
|
||||
pub fn destination(&self) -> Address {
|
||||
let bytes = self.0.as_ref();
|
||||
Address::from_bytes(&bytes[field::DESTINATION])
|
||||
}
|
||||
|
||||
/// Return the length field, without checking for 802.1Q.
|
||||
#[inline(always)]
|
||||
pub fn length(&self) -> u16 {
|
||||
let bytes = self.0.as_ref();
|
||||
NetworkEndian::read_u16(&bytes[field::LENGTH])
|
||||
}
|
||||
|
||||
/// Return a pointer to the payload, without checking for 802.1Q.
|
||||
#[inline(always)]
|
||||
pub fn payload(&self) -> &[u8] {
|
||||
let bytes = self.0.as_ref();
|
||||
&bytes[field::PAYLOAD]
|
||||
}
|
||||
}
|
||||
|
||||
impl<T: AsRef<[u8]> + AsMut<[u8]>> Frame<T> {
|
||||
/// Set the source address field.
|
||||
#[inline(always)]
|
||||
pub fn set_source(&mut self, value: Address) {
|
||||
let bytes = self.0.as_mut();
|
||||
bytes[field::SOURCE].copy_from_slice(value.as_bytes())
|
||||
}
|
||||
|
||||
/// Set the destination address field.
|
||||
#[inline(always)]
|
||||
pub fn set_destination(&mut self, value: Address) {
|
||||
let bytes = self.0.as_mut();
|
||||
bytes[field::DESTINATION].copy_from_slice(value.as_bytes())
|
||||
}
|
||||
|
||||
/// Set the length field.
|
||||
#[inline(always)]
|
||||
pub fn set_length(&mut self, value: u16) {
|
||||
let bytes = self.0.as_mut();
|
||||
NetworkEndian::write_u16(&mut bytes[field::LENGTH], value)
|
||||
}
|
||||
|
||||
/// Return a mutable pointer to the payload.
|
||||
#[inline(always)]
|
||||
pub fn payload_mut(&mut self) -> &mut [u8] {
|
||||
let bytes = self.0.as_mut();
|
||||
&mut bytes[field::PAYLOAD]
|
||||
}
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod test {
|
||||
use super::*;
|
||||
|
||||
static FRAME_BYTES: [u8; 64] =
|
||||
[0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
|
||||
0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
|
||||
0x00, 0x40,
|
||||
0xaa, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0xff];
|
||||
|
||||
static PAYLOAD_BYTES: [u8; 50] =
|
||||
[0xaa, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0xff];
|
||||
|
||||
#[test]
|
||||
fn test_deconstruct() {
|
||||
let frame = Frame::new(&FRAME_BYTES[..]).unwrap();
|
||||
assert_eq!(frame.source(), Address([0x01, 0x02, 0x03, 0x04, 0x05, 0x06]));
|
||||
assert_eq!(frame.destination(), Address([0x11, 0x12, 0x13, 0x14, 0x15, 0x16]));
|
||||
assert_eq!(frame.length(), FRAME_BYTES.len() as u16);
|
||||
assert_eq!(frame.payload(), &PAYLOAD_BYTES[..]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_construct() {
|
||||
let mut bytes = vec![0; 64];
|
||||
let mut frame = Frame::new(&mut bytes).unwrap();
|
||||
frame.set_source(Address([0x01, 0x02, 0x03, 0x04, 0x05, 0x06]));
|
||||
frame.set_destination(Address([0x11, 0x12, 0x13, 0x14, 0x15, 0x16]));
|
||||
frame.set_length(64);
|
||||
frame.payload_mut().copy_from_slice(&PAYLOAD_BYTES[..]);
|
||||
assert_eq!(&frame.into_inner()[..], &FRAME_BYTES[..]);
|
||||
}
|
||||
}
|
|
@ -0,0 +1,49 @@
|
|||
#![feature(range_contains)]
|
||||
#![no_std]
|
||||
|
||||
#[cfg(test)]
|
||||
#[macro_use]
|
||||
extern crate std;
|
||||
|
||||
extern crate byteorder;
|
||||
|
||||
macro_rules! enum_with_unknown {
|
||||
(#[$( $attr:meta ),*]
|
||||
pub enum $name:ident($ty:ty) { $( $variant:ident = $value:expr ),+ }) => {
|
||||
#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Clone, Copy)]
|
||||
#[$( $attr ),*]
|
||||
pub enum $name {
|
||||
$( $variant ),*,
|
||||
Unknown($ty)
|
||||
}
|
||||
|
||||
impl ::core::convert::From<$ty> for $name {
|
||||
fn from(value: $ty) -> Self {
|
||||
match value {
|
||||
$( $value => $name::$variant ),*,
|
||||
other => $name::Unknown(other)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl ::core::convert::From<$name> for $ty {
|
||||
fn from(value: $name) -> Self {
|
||||
match value {
|
||||
$( $name::$variant => $value ),*,
|
||||
$name::Unknown(other) => other
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
mod field {
|
||||
pub type Field = ::core::ops::Range<usize>;
|
||||
pub type FieldFrom = ::core::ops::RangeFrom<usize>;
|
||||
}
|
||||
|
||||
mod ethernet;
|
||||
|
||||
pub use ethernet::ProtocolType as EthernetProtocolType;
|
||||
pub use ethernet::Address as EthernetAddress;
|
||||
pub use ethernet::Frame as EthernetFrame;
|
Loading…
Reference in New Issue