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use serde::Serialize;
use num_traits::FromPrimitive;
use std::error::Error;
use std::fmt::{Display, Formatter};
#[derive(Debug, PartialEq, Eq, Clone, Serialize)]
pub enum BgpCapabilityParsingError {
Unassigned(u8),
DeprecatedCode(u8),
ReservedCode(u8),
ReservedExperimentalCode(u8),
}
impl Display for BgpCapabilityParsingError {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
match self {
BgpCapabilityParsingError::Unassigned(v) => {
write!(f, "unassigned BGP capability code: {}", v)
}
BgpCapabilityParsingError::DeprecatedCode(v) => {
write!(f, "deprecated BGP capability code: {}", v)
}
BgpCapabilityParsingError::ReservedCode(v) => {
write!(f, "reserved BGP capability code: {}", v)
}
BgpCapabilityParsingError::ReservedExperimentalCode(v) => {
write!(f, "reserved BGP capability code for experimental use: {}", v)
}
}
}
}
impl Error for BgpCapabilityParsingError{}
#[allow(non_camel_case_types)]
#[derive(Debug, Primitive, PartialEq, Eq, Hash, Copy, Clone, Serialize)]
pub enum BgpCapabilityType {
MULTIPROTOCOL_EXTENSIONS_FOR_BGP_4 = 1,
ROUTE_REFRESH_CAPABILITY_FOR_BGP_4 = 2,
OUTBOUND_ROUTE_FILTERING_CAPABILITY = 3,
EXTENDED_NEXT_HOP_ENCODING = 5,
BGP_EXTENDED_MESSAGE = 6,
BGPSEC_CAPABILITY = 7,
MULTIPLE_LABELS_CAPABILITY = 8,
BGP_ROLE = 9,
GRACEFUL_RESTART_CAPABILITY = 64,
SUPPORT_FOR_4_OCTET_AS_NUMBER_CAPABILITY = 65,
SUPPORT_FOR_DYNAMIC_CAPABILITY = 67,
MULTISESSION_BGP_CAPABILITY = 68,
ADD_PATH_CAPABILITY = 69,
ENHANCED_ROUTE_REFRESH_CAPABILITY = 70,
LONG_LIVED_GRACEFUL_RESTART_CAPABILITY = 71,
ROUTING_POLICY_DISTRIBUTION = 72,
FQDN_CAPABILITY = 73,
}
pub fn parse_capability(capability_code: &u8) -> Result<BgpCapabilityType, BgpCapabilityParsingError> {
match BgpCapabilityType::from_u8(*capability_code) {
Some(v) => {
return Ok(v)
}
None => {
if [4, 66, 128, 129, 130, 131, 184, 185].contains(capability_code) {
Err(BgpCapabilityParsingError::DeprecatedCode(*capability_code))
} else if *capability_code == 0 || *capability_code == 255 {
Err(BgpCapabilityParsingError::ReservedCode(*capability_code))
} else if *capability_code >= 239 && *capability_code <= 254 {
Err(BgpCapabilityParsingError::ReservedExperimentalCode(*capability_code))
} else {
Err(BgpCapabilityParsingError::Unassigned(*capability_code))
}
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_parsing_capability() {
let mut code;
code = 0;
assert_eq!(parse_capability(&code), Err(BgpCapabilityParsingError::ReservedCode(code)));
code = 255;
assert_eq!(parse_capability(&code), Err(BgpCapabilityParsingError::ReservedCode(code)));
for code in [4, 66, 128, 129, 130, 131, 184, 185] {
assert_eq!(parse_capability(&code), Err(BgpCapabilityParsingError::DeprecatedCode(code)));
}
for code in 10..=63 {
assert_eq!(parse_capability(&code), Err(BgpCapabilityParsingError::Unassigned(code)));
}
for code in 74..=127 {
assert_eq!(parse_capability(&code), Err(BgpCapabilityParsingError::Unassigned(code)));
}
for code in 132..=183 {
assert_eq!(parse_capability(&code), Err(BgpCapabilityParsingError::Unassigned(code)));
}
for code in 186..=238 {
assert_eq!(parse_capability(&code), Err(BgpCapabilityParsingError::Unassigned(code)));
}
code = 1;
assert_eq!(parse_capability(&code), Ok(BgpCapabilityType::MULTIPROTOCOL_EXTENSIONS_FOR_BGP_4));
code = 2;
assert_eq!(parse_capability(&code), Ok(BgpCapabilityType::ROUTE_REFRESH_CAPABILITY_FOR_BGP_4));
code = 3;
assert_eq!(parse_capability(&code), Ok(BgpCapabilityType::OUTBOUND_ROUTE_FILTERING_CAPABILITY));
code = 5;
assert_eq!(parse_capability(&code), Ok(BgpCapabilityType::EXTENDED_NEXT_HOP_ENCODING));
code = 6;
assert_eq!(parse_capability(&code), Ok(BgpCapabilityType::BGP_EXTENDED_MESSAGE));
code = 7;
assert_eq!(parse_capability(&code), Ok(BgpCapabilityType::BGPSEC_CAPABILITY));
code = 8;
assert_eq!(parse_capability(&code), Ok(BgpCapabilityType::MULTIPLE_LABELS_CAPABILITY));
code = 9;
assert_eq!(parse_capability(&code), Ok(BgpCapabilityType::BGP_ROLE));
code = 64;
assert_eq!(parse_capability(&code), Ok(BgpCapabilityType::GRACEFUL_RESTART_CAPABILITY));
code = 65;
assert_eq!(parse_capability(&code), Ok(BgpCapabilityType::SUPPORT_FOR_4_OCTET_AS_NUMBER_CAPABILITY));
code = 67;
assert_eq!(parse_capability(&code), Ok(BgpCapabilityType::SUPPORT_FOR_DYNAMIC_CAPABILITY));
code = 68;
assert_eq!(parse_capability(&code), Ok(BgpCapabilityType::MULTISESSION_BGP_CAPABILITY));
code = 69;
assert_eq!(parse_capability(&code), Ok(BgpCapabilityType::ADD_PATH_CAPABILITY));
code = 70;
assert_eq!(parse_capability(&code), Ok(BgpCapabilityType::ENHANCED_ROUTE_REFRESH_CAPABILITY));
code = 71;
assert_eq!(parse_capability(&code), Ok(BgpCapabilityType::LONG_LIVED_GRACEFUL_RESTART_CAPABILITY));
code = 72;
assert_eq!(parse_capability(&code), Ok(BgpCapabilityType::ROUTING_POLICY_DISTRIBUTION));
code = 73;
assert_eq!(parse_capability(&code), Ok(BgpCapabilityType::FQDN_CAPABILITY));
}
}