netlink_packet_route/prefix/
attribute.rs

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1// SPDX-License-Identifier: MIT
2
3use super::cache_info::{CacheInfo, CacheInfoBuffer};
4use super::error::PrefixError;
5use netlink_packet_utils::nla::{self, DefaultNla, NlaBuffer};
6use netlink_packet_utils::traits::Parseable;
7use netlink_packet_utils::Emitable;
8use std::convert::TryInto;
9use std::net::Ipv6Addr;
10
11const PREFIX_ADDRESS: u16 = 1;
12const PREFIX_CACHEINFO: u16 = 2;
13
14#[derive(Debug, PartialEq, Eq, Clone)]
15pub enum PrefixAttribute {
16    Address(Ipv6Addr),
17    CacheInfo(CacheInfo),
18    Other(DefaultNla),
19}
20
21impl nla::Nla for PrefixAttribute {
22    fn value_len(&self) -> usize {
23        match *self {
24            Self::Address(_) => 16,
25            Self::CacheInfo(ref cache_info) => cache_info.buffer_len(),
26            Self::Other(ref attr) => attr.value_len(),
27        }
28    }
29
30    fn emit_value(&self, buffer: &mut [u8]) {
31        match *self {
32            Self::Address(ref addr) => buffer.copy_from_slice(&addr.octets()),
33            Self::CacheInfo(ref cache_info) => cache_info.emit(buffer),
34            Self::Other(ref attr) => attr.emit_value(buffer),
35        }
36    }
37
38    fn kind(&self) -> u16 {
39        match *self {
40            Self::Address(_) => PREFIX_ADDRESS,
41            Self::CacheInfo(_) => PREFIX_CACHEINFO,
42            Self::Other(ref nla) => nla.kind(),
43        }
44    }
45}
46
47impl<'a, T: AsRef<[u8]> + ?Sized> Parseable<NlaBuffer<&'a T>> for PrefixAttribute {
48    type Error = PrefixError;
49    fn parse(buf: &NlaBuffer<&'a T>) -> Result<Self, PrefixError> {
50        let payload = buf.value();
51        match buf.kind() {
52            PREFIX_ADDRESS => {
53                if let Ok(payload) = TryInto::<[u8; 16]>::try_into(payload) {
54                    Ok(Self::Address(Ipv6Addr::from(payload)))
55                } else {
56                    Err(PrefixError::InvalidPrefixAddress { payload_length: payload.len() })
57                }
58            }
59            PREFIX_CACHEINFO => Ok(Self::CacheInfo(
60                CacheInfo::parse(&CacheInfoBuffer::new(payload))
61                    .map_err(PrefixError::InvalidPrefixCacheInfo)?,
62            )),
63            _ => Ok(Self::Other(DefaultNla::parse(buf).map_err(PrefixError::Other)?)),
64        }
65    }
66}
netlink_packet_route/prefix/attribute.rs

netlink_packet_route/prefix/
attribute.rs
