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#![allow(unused)]
//! This module handles converting MRT records into individual per-prefix BGP elements.
//!
//! Each MRT record may contain reachability information for multiple prefixes. This module breaks
//! down MRT records into corresponding BGP elements, and thus allowing users to more conveniently
//! process BGP information on a per-prefix basis.
use std::collections::HashMap;
use std::fmt::{Display, Formatter};
use std::net::IpAddr;
use bgp_models::prelude::*;
use itertools::Itertools;
use log::warn;
use crate::parser::bgp::messages::parse_bgp_update_message;
pub struct Elementor {
peer_table: Option<PeerIndexTable>,
}
// use macro_rules! <name of macro>{<Body>}
macro_rules! get_attr_value {
($a:tt, $b:expr) => {
if let Attribute::$a(x) = $b {
Some(x)
} else {
None
}
};
}
fn get_relevant_attributes(
attributes: Vec<Attribute>,
) -> (
Option<AsPath>,
Option<AsPath>,
Option<Origin>,
Option<IpAddr>,
Option<u32>,
Option<u32>,
Option<Vec<MetaCommunity>>,
Option<AtomicAggregate>,
Option<(Asn, IpAddr)>,
Option<Nlri>,
Option<Nlri>,
) {
let mut as_path = None;
let mut as4_path = None;
let mut origin = None;
let mut next_hop = None;
let mut local_pref = Some(0);
let mut med = Some(0);
let mut atomic = Some(AtomicAggregate::NAG);
let mut aggregator = None;
let mut announced = None;
let mut withdrawn = None;
let mut communities_vec: Vec<MetaCommunity> = vec![];
for attr in attributes {
match attr.value {
AttributeValue::Origin(v) => {origin = Some(v)}
AttributeValue::AsPath(v) => {as_path = Some(v)}
AttributeValue::As4Path(v) => {as4_path = Some(v)}
AttributeValue::NextHop(v) => {next_hop = Some(v)}
AttributeValue::MultiExitDiscriminator(v) => {med = Some(v)}
AttributeValue::LocalPreference(v) => {local_pref = Some(v)}
AttributeValue::AtomicAggregate(v) => {atomic = Some(v)}
AttributeValue::Communities(v) => {communities_vec.extend(v.into_iter().map(MetaCommunity::Community).collect::<Vec<MetaCommunity>>())}
AttributeValue::ExtendedCommunities(v) => {communities_vec.extend(v.into_iter().map(MetaCommunity::ExtendedCommunity).collect::<Vec<MetaCommunity>>())}
AttributeValue::LargeCommunities(v) => {communities_vec.extend(v.into_iter().map(MetaCommunity::LargeCommunity).collect::<Vec<MetaCommunity>>())}
AttributeValue::Aggregator(v, v2) => {aggregator = Some((v,v2))}
AttributeValue::MpReachNlri(nlri) => {announced = Some(nlri)}
AttributeValue::MpUnreachNlri(nlri) => {withdrawn = Some(nlri)}
AttributeValue::OriginatorId(_) | AttributeValue::Clusters(_)| AttributeValue::Development(_) => {}
};
}
let communities = match !communities_vec.is_empty() {
true => Some(communities_vec),
false => None,
};
(
as_path,
as4_path,
origin,
next_hop,
local_pref,
med,
communities,
atomic,
aggregator,
announced,
withdrawn,
)
}
impl Elementor {
pub fn new() -> Elementor {
Elementor { peer_table: None }
}
/// Convert a [BgpMessage] to a vector of [BgpElem]s.
///
/// A [BgpMessage] may include `Update`, `Open`, `Notification` or `KeepAlive` messages,
/// and only `Update` message contains [BgpElem]s.
pub fn bgp_to_elems(msg: BgpMessage, timestamp: f64, peer_ip: &IpAddr, peer_asn: &Asn) -> Vec<BgpElem> {
match msg {
BgpMessage::Update(msg) => {
Elementor::bgp_update_to_elems(msg, timestamp, peer_ip, peer_asn)
}
BgpMessage::Open(_) | BgpMessage::Notification(_) | BgpMessage::KeepAlive(_) => {
vec![]
}
}
}
/// Convert a [BgpUpdateMessage] to a vector of [BgpElem]s.
pub fn bgp_update_to_elems(msg: BgpUpdateMessage, timestamp: f64, peer_ip: &IpAddr, peer_asn: &Asn) -> Vec<BgpElem> {
let mut elems = vec![];
let (
as_path,
as4_path, // Table dump v1 does not have 4-byte AS number
origin,
next_hop,
local_pref,
med,
communities,
atomic,
aggregator,
announced,
withdrawn,
) = get_relevant_attributes(msg.attributes);
let path = match (as_path, as4_path) {
(None, None) => None,
(Some(v), None) => Some(v),
(None, Some(v)) => Some(v),
(Some(v1), Some(v2)) => {
Some(AsPath::merge_aspath_as4path(&v1, &v2).unwrap())
}
};
let origin_asns = match &path {
None => None,
Some(p) => p.get_origin()
};
elems.extend(msg.announced_prefixes.into_iter().map(|p| BgpElem {
timestamp,
elem_type: ElemType::ANNOUNCE,
peer_ip: *peer_ip,
peer_asn: *peer_asn,
prefix: p,
next_hop,
as_path: path.clone(),
origin_asns: origin_asns.clone(),
origin,
local_pref,
med,
communities: communities.clone(),
atomic,
aggr_asn: aggregator.as_ref().map(|v| v.0),
aggr_ip: aggregator.as_ref().map(|v| v.1),
}));
if let Some(nlri) = announced {
elems.extend(nlri.prefixes.into_iter().map(|p| BgpElem {
timestamp,
elem_type: ElemType::ANNOUNCE,
peer_ip: *peer_ip,
peer_asn: *peer_asn,
prefix: p,
next_hop,
as_path: path.clone(),
origin,
origin_asns: origin_asns.clone(),
local_pref,
med,
communities: communities.clone(),
atomic,
aggr_asn: aggregator.as_ref().map(|v| v.0),
aggr_ip: aggregator.as_ref().map(|v| v.1),
}));
}
elems.extend(msg.withdrawn_prefixes.into_iter().map(|p| BgpElem {
timestamp,
elem_type: ElemType::WITHDRAW,
peer_ip: *peer_ip,
peer_asn: *peer_asn,
prefix: p,
next_hop: None,
as_path: None,
origin: None,
origin_asns: None,
local_pref: None,
med: None,
communities: None,
atomic: None,
aggr_asn: None,
aggr_ip: None,
}));
if let Some(nlri) = withdrawn {
elems.extend(nlri.prefixes.into_iter().map(|p| BgpElem {
timestamp,
elem_type: ElemType::WITHDRAW,
peer_ip: *peer_ip,
peer_asn: *peer_asn,
prefix: p,
next_hop: None,
as_path: None,
origin: None,
origin_asns: None,
local_pref: None,
med: None,
communities: None,
atomic: None,
aggr_asn: None,
aggr_ip: None,
}));
};
elems
}
/// Convert a [MrtRecord] to a vector of [BgpElem]s.
pub fn record_to_elems(&mut self, record: MrtRecord) -> Vec<BgpElem> {
let mut elems = vec![];
let t = record.common_header.timestamp;
let timestamp :f64 = if let Some(micro) = &record.common_header.microsecond_timestamp {
let m = (*micro as f64)/1000000.0;
t as f64 + m
} else {
f64::from(t)
};
match record.message {
MrtMessage::TableDumpMessage(msg) => {
let (
as_path,
_as4_path, // Table dump v1 does not have 4-byte AS number
origin,
next_hop,
local_pref,
med,
communities,
atomic,
aggregator,
_announced,
_withdrawn,
) = get_relevant_attributes(msg.attributes);
let origin_asns = match &as_path {
None => None,
Some(p) => p.get_origin()
};
elems.push(BgpElem {
timestamp,
elem_type: ElemType::ANNOUNCE,
peer_ip: msg.peer_address,
peer_asn: msg.peer_asn,
prefix: msg.prefix,
next_hop,
as_path,
origin,
origin_asns,
local_pref,
med,
communities,
atomic,
aggr_asn: aggregator.map(|v| v.0),
aggr_ip: aggregator.map(|v| v.1),
});
}
MrtMessage::TableDumpV2Message(msg) => {
match msg {
TableDumpV2Message::PeerIndexTable(p) => {
self.peer_table = Some(p);
}
TableDumpV2Message::RibAfiEntries(t) => {
let prefix = t.prefix;
for e in t.rib_entries {
let pid = e.peer_index;
let peer = self
.peer_table
.as_ref()
.unwrap()
.peers_map
.get(&(pid as u32))
.unwrap();
let (
as_path,
as4_path, // Table dump v1 does not have 4-byte AS number
origin,
next_hop,
local_pref,
med,
communities,
atomic,
aggregator,
announced,
_withdrawn,
) = get_relevant_attributes(e.attributes);
let path = match (as_path, as4_path) {
(None, None) => None,
(Some(v), None) => Some(v),
(None, Some(v)) => Some(v),
(Some(v1), Some(v2)) => {
Some(AsPath::merge_aspath_as4path(&v1, &v2).unwrap())
}
};
let next = match next_hop {
None => {
if let Some(v) = announced {
if let Some(h) = v.next_hop {
match h {
NextHopAddress::Ipv4(v) => {
Some(IpAddr::from(v))
}
NextHopAddress::Ipv6(v) => {
Some(IpAddr::from(v))
}
NextHopAddress::Ipv6LinkLocal(v, _) => {
Some(IpAddr::from(v))
}
}
} else {
None
}
} else {
None
}
}
Some(v) => Some(v),
};
let origin_asns = match &path {
None => None,
Some(p) => p.get_origin()
};
elems.push(BgpElem {
timestamp,
elem_type: ElemType::ANNOUNCE,
peer_ip: peer.peer_address,
peer_asn: peer.peer_asn,
prefix,
next_hop: next,
as_path: path,
origin,
origin_asns,
local_pref,
med,
communities,
atomic,
aggr_asn: aggregator.map(|v| v.0),
aggr_ip: aggregator.map(|v| v.1),
});
}
}
TableDumpV2Message::RibGenericEntries(_t) => {
warn!("to_elem for TableDumpV2Message::RibGenericEntries not yet implemented");
}
}
}
MrtMessage::Bgp4Mp(msg) => {
match msg {
Bgp4Mp::Bgp4MpStateChange(_v) | Bgp4Mp::Bgp4MpStateChangeAs4(_v) => {}
Bgp4Mp::Bgp4MpMessage(v)
| Bgp4Mp::Bgp4MpMessageLocal(v)
| Bgp4Mp::Bgp4MpMessageAs4(v)
| Bgp4Mp::Bgp4MpMessageAs4Local(v) => {
elems.extend(
Elementor::bgp_to_elems(v.bgp_message, timestamp, &v.peer_ip, &v.peer_asn)
);
}
}
}
}
elems
}
}
#[inline(always)]
pub fn option_to_string<T>(o: &Option<T>) -> String
where
T: Display,
{
if let Some(v) = o {
v.to_string()
} else {
String::new()
}
}