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use nom::number;
use nom::IResult;
use std::convert::TryFrom;
/******************************************************************************
* Struct
******************************************************************************/
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub struct MacAddress(pub [u8; 6]);
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum EtherType {
LANMIN,
LANMAX,
IPv4,
ARP,
WOL,
TRILL,
DECnet,
RARP,
AppleTalk,
AARP,
VLAN,
IPX,
Qnet,
IPv6,
FlowControl,
CobraNet,
MPLSuni,
MPLSmulti,
PPPoEdiscovery,
PPPoEsession,
HomePlug,
EAPOL,
PROFINET,
HyperSCSI,
ATAOE,
EtherCAT,
QinQ,
Powerlink,
GOOSE,
GSE,
LLDP,
SERCOS,
HomePlugAV,
MRP,
MACsec,
PBB,
PTP,
PRP,
CFM,
FCoE,
FCoEi,
RoCE,
TTE,
HSR,
CTP,
VLANdouble,
Other(u16),
}
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub struct EthernetFrame {
pub src_mac: MacAddress,
pub dst_mac: MacAddress,
pub ether_type: EtherType,
}
/******************************************************************************
* Parse
******************************************************************************/
impl From<u16> for EtherType {
fn from(raw: u16) -> Self {
match raw {
0x002E => Self::LANMIN, // 802.3 Min data length
0x05DC => Self::LANMAX, // 802.3 Max data length
0x0800 => Self::IPv4, // Internet Protocol version 4 (IPv4) [RFC7042]
0x0806 => Self::ARP, // Address Resolution Protocol (ARP) [RFC7042]
0x0842 => Self::WOL, // Wake on LAN
0x22F3 => Self::TRILL, // IETF TRILL Protocol [IEEE]
0x6003 => Self::DECnet, // DECnet Phase IV
0x8035 => Self::RARP, // Reverse Address Resolution Protocol (RARP) [RFC903]
0x809B => Self::AppleTalk, // AppleTalk - EtherTalk [Apple]
0x80F3 => Self::AARP, // AppleTalk Address Resolution Protocol (AARP) [Apple]
0x8100 => Self::VLAN, // VLAN-tagged frame (IEEE 802.1Q) and Shortest Path Bridging IEEE 802.1aq[5]
0x8137 => Self::IPX, // IPX [Xerox]
0x8204 => Self::Qnet, // QNX Qnet [QNX Software Systems]
0x86DD => Self::IPv6, // Internet Protocol Version 6 (IPv6) [RFC7042]
0x8808 => Self::FlowControl, // Ethernet Flow Control [IEEE 802.3x]
0x8819 => Self::CobraNet, // CobraNet [CobraNet]
0x8847 => Self::MPLSuni, // MPLS Unicast [RFC 3032]
0x8848 => Self::MPLSmulti, // MPLS Multicast [RFC 5332]
0x8863 => Self::PPPoEdiscovery, // PPPOE Discovery Stage [RFC 2516]
0x8864 => Self::PPPoEsession, // PPPoE Session Stage [RFC 2516]
0x887B => Self::HomePlug, // HomePlug 1.0 MME
0x888E => Self::EAPOL, // EAP over LAN (IEEE 802.1X)
0x8892 => Self::PROFINET, // PROFINET Protocol
0x889A => Self::HyperSCSI, // HyperSCSI (SCSI over Ethernet)
0x88A2 => Self::ATAOE, // ATA over Ethernet
0x88A4 => Self::EtherCAT, // EtherCAT Protocol
0x88A8 => Self::QinQ, // Provider Bridging (IEEE 802.1ad) & Shortest Path Bridging IEEE 802.1aq[5]
0x88AB => Self::Powerlink, // Ethernet Powerlink[citation needed]
0x88B8 => Self::GOOSE, // GOOSE (Generic Object Oriented Substation event)
0x88B9 => Self::GSE, // GSE (Generic Substation Events) Management Services
0x88CC => Self::LLDP, // Link Layer Discovery Protocol (LLDP) [IEEE 802.1AB]
0x88CD => Self::SERCOS, // SERCOS III
0x88E1 => Self::HomePlugAV, // HomePlug AV MME[citation needed]
0x88E3 => Self::MRP, // Media Redundancy Protocol (IEC62439-2)
0x88E5 => Self::MACsec, // MAC security (IEEE 802.1AE)
0x88E7 => Self::PBB, // Provider Backbone Bridges (PBB) (IEEE 802.1ah)
0x88F7 => Self::PTP, // Precision Time Protocol (PTP) over Ethernet [IEEE 1588]
0x88FB => Self::PRP, // Parallel Redundancy Protocol (PRP)
0x8902 => Self::CFM, // IEEE 802.1ag Connectivity Fault Management (CFM) Protocol / ITU-T Recommendation Y.1731 (OAM)
0x8906 => Self::FCoE, // Fibre Channel over Ethernet (FCoE)
0x8914 => Self::FCoEi, // FCoE Initialization Protocol
0x8915 => Self::RoCE, // RDMA over Converged Ethernet (RoCE)
0x891D => Self::TTE, // TTEthernet Protocol Control Frame (TTE)
0x892F => Self::HSR, // High-availability Seamless Redundancy (HSR)
0x9000 => Self::CTP, // Ethernet Configuration Testing Protocol[6]
0x9100 => Self::VLANdouble, // VLAN-tagged (IEEE 802.1Q) frame with double tagging
other => Self::Other(other),
}
}
}
fn parse_mac_address(input: &[u8]) -> IResult<&[u8], MacAddress> {
let (input, mac_address) = nom::bytes::streaming::take(6u8)(input)?;
Ok((input, MacAddress(<[u8; 6]>::try_from(mac_address).unwrap())))
}
fn parse_ether_type(input: &[u8]) -> IResult<&[u8], EtherType> {
let (input, ether_type) = number::streaming::be_u16(input)?;
Ok((input, ether_type.into()))
}
pub fn parse_ethernet(input: &[u8]) -> IResult<&[u8], EthernetFrame> {
let (input, dst_mac) = parse_mac_address(input)?;
let (input, src_mac) = parse_mac_address(input)?;
let (input, ether_type) = parse_ether_type(input)?;
Ok((
input,
EthernetFrame {
src_mac,
dst_mac,
ether_type,
},
))
}
/******************************************************************************
* TEST
******************************************************************************/
#[cfg(test)]
mod tests {
use super::parse_ethernet;
use super::{EtherType, EthernetFrame, MacAddress};
const LAST_SLICE: &'static [u8] = &[0xff];
#[test]
fn parse_ethernet_works() {
/*
* Ethernet II, Src: Apple_0a:c5:ea (3c:a6:f6:0a:c5:ea), Dst: Charge-A_08:02:be (4c:bc:98:08:02:be)
* Destination: Charge-A_08:02:be (4c:bc:98:08:02:be)
* Address: Charge-A_08:02:be (4c:bc:98:08:02:be)
* .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
* .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
* Source: Apple_0a:c5:ea (3c:a6:f6:0a:c5:ea)
* Address: Apple_0a:c5:ea (3c:a6:f6:0a:c5:ea)
* .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
* .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
* Type: IPv4 (0x0800)
*/
let bytes = [
0x4c, 0xbc, 0x98, 0x08, 0x02, 0xbe, /* Destination Address */
0x3c, 0xa6, 0xf6, 0x0a, 0xc5, 0xea, /* Source Address */
0x08, 0x00, /* Type */
0xff, /* Payload */
];
let expectation = EthernetFrame {
src_mac: MacAddress([0x3c, 0xa6, 0xf6, 0x0a, 0xc5, 0xea]),
dst_mac: MacAddress([0x4c, 0xbc, 0x98, 0x08, 0x02, 0xbe]),
ether_type: EtherType::IPv4,
};
assert_eq!(parse_ethernet(&bytes), Ok((LAST_SLICE, expectation)));
}
}
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