netlink_packet_route/prefix/
attribute.rs

1// SPDX-License-Identifier: MIT
2
3use std::net::Ipv6Addr;
4
5use netlink_packet_core::{
6    DecodeError, DefaultNla, Emitable, ErrorContext, Nla, NlaBuffer, Parseable,
7};
8
9use super::cache_info::{CacheInfo, CacheInfoBuffer};
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 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>>
48    for PrefixAttribute
49{
50    fn parse(buf: &NlaBuffer<&'a T>) -> Result<Self, DecodeError> {
51        let payload = buf.value();
52        match buf.kind() {
53            PREFIX_ADDRESS => {
54                if let Ok(payload) = TryInto::<[u8; 16]>::try_into(payload) {
55                    Ok(Self::Address(Ipv6Addr::from(payload)))
56                } else {
57                    Err(DecodeError::from(format!(
58                        "Invalid PREFIX_ADDRESS, unexpected payload length: \
59                         {payload:?}"
60                    )))
61                }
62            }
63            PREFIX_CACHEINFO => Ok(Self::CacheInfo(
64                CacheInfo::parse(&CacheInfoBuffer::new(payload)).context(
65                    format!("Invalid PREFIX_CACHEINFO: {payload:?}"),
66                )?,
67            )),
68            _ => Ok(Self::Other(DefaultNla::parse(buf)?)),
69        }
70    }
71}
netlink_packet_route/prefix/attribute.rs

netlink_packet_route/prefix/
attribute.rs
