mod cache_info;
pub use self::cache_info::*;
use std::mem::size_of;
use anyhow::Context;
use byteorder::{ByteOrder, NativeEndian};
use crate::{
constants::*,
nlas::{self, DefaultNla, NlaBuffer},
parsers::{parse_string, parse_u32},
traits::Parseable,
DecodeError,
};
#[derive(Debug, PartialEq, Eq, Clone)]
pub enum Nla {
Unspec(Vec<u8>),
Address(Vec<u8>),
Local(Vec<u8>),
Label(String),
Broadcast(Vec<u8>),
Anycast(Vec<u8>),
CacheInfo(Vec<u8>),
Multicast(Vec<u8>),
Flags(u32),
Other(DefaultNla),
}
impl nlas::Nla for Nla {
#[rustfmt::skip]
fn value_len(&self) -> usize {
use self::Nla::*;
match *self {
Unspec(ref bytes)
| Address(ref bytes)
| Local(ref bytes)
| Broadcast(ref bytes)
| Anycast(ref bytes)
| Multicast(ref bytes) => bytes.len(),
Label(ref string) => string.as_bytes().len() + 1,
Flags(_) => size_of::<u32>(),
CacheInfo(ref buffer) => buffer.len(),
Other(ref attr) => attr.value_len(),
}
}
#[rustfmt::skip]
fn emit_value(&self, buffer: &mut [u8]) {
use self::Nla::*;
match *self {
Unspec(ref bytes)
| Address(ref bytes)
| Local(ref bytes)
| Broadcast(ref bytes)
| Anycast(ref bytes)
| CacheInfo(ref bytes)
| Multicast(ref bytes) => buffer.copy_from_slice(bytes.as_slice()),
Label(ref string) => {
buffer[..string.len()].copy_from_slice(string.as_bytes());
buffer[string.len()] = 0;
}
Flags(ref value) => NativeEndian::write_u32(buffer, *value),
Other(ref attr) => attr.emit_value(buffer),
}
}
fn kind(&self) -> u16 {
use self::Nla::*;
match *self {
Unspec(_) => IFA_UNSPEC,
Address(_) => IFA_ADDRESS,
Local(_) => IFA_LOCAL,
Label(_) => IFA_LABEL,
Broadcast(_) => IFA_BROADCAST,
Anycast(_) => IFA_ANYCAST,
CacheInfo(_) => IFA_CACHEINFO,
Multicast(_) => IFA_MULTICAST,
Flags(_) => IFA_FLAGS,
Other(ref nla) => nla.kind(),
}
}
}
impl<'a, T: AsRef<[u8]> + ?Sized> Parseable<NlaBuffer<&'a T>> for Nla {
fn parse(buf: &NlaBuffer<&'a T>) -> Result<Self, DecodeError> {
use self::Nla::*;
let payload = buf.value();
Ok(match buf.kind() {
IFA_UNSPEC => Unspec(payload.to_vec()),
IFA_ADDRESS => Address(payload.to_vec()),
IFA_LOCAL => Local(payload.to_vec()),
IFA_LABEL => Label(parse_string(payload).context("invalid IFA_LABEL value")?),
IFA_BROADCAST => Broadcast(payload.to_vec()),
IFA_ANYCAST => Anycast(payload.to_vec()),
IFA_CACHEINFO => CacheInfo(payload.to_vec()),
IFA_MULTICAST => Multicast(payload.to_vec()),
IFA_FLAGS => Flags(parse_u32(payload).context("invalid IFA_FLAGS value")?),
kind => Other(DefaultNla::parse(buf).context(format!("unknown NLA type {}", kind))?),
})
}
}