netlink_packet_route/link/
down_reason.rs

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// SPDX-License-Identifier: MIT

use anyhow::Context;
use byteorder::{ByteOrder, NativeEndian};
use netlink_packet_utils::nla::{DefaultNla, Nla, NlaBuffer};
use netlink_packet_utils::parsers::parse_u32;
use netlink_packet_utils::{DecodeError, Parseable};

const IFLA_PROTO_DOWN_REASON_MASK: u16 = 1;
const IFLA_PROTO_DOWN_REASON_VALUE: u16 = 2;

#[derive(Debug, PartialEq, Eq, Clone)]
#[non_exhaustive]
pub enum LinkProtocolDownReason {
    Value(u32),
    Mask(u32),
    Other(DefaultNla),
}

impl<'a, T: AsRef<[u8]> + ?Sized> Parseable<NlaBuffer<&'a T>> for LinkProtocolDownReason {
    type Error = DecodeError;
    fn parse(buf: &NlaBuffer<&'a T>) -> Result<Self, DecodeError> {
        let payload = buf.value();
        Ok(match buf.kind() {
            IFLA_PROTO_DOWN_REASON_MASK => Self::Mask(
                parse_u32(payload)
                    .context(format!("invalid IFLA_PROTO_DOWN_REASON_MASK {payload:?}"))?,
            ),
            IFLA_PROTO_DOWN_REASON_VALUE => Self::Value(
                parse_u32(payload)
                    .context(format!("invalid IFLA_PROTO_DOWN_REASON_MASK {payload:?}"))?,
            ),
            kind => Self::Other(DefaultNla::parse(buf).context(format!(
                "unknown NLA type {kind} for IFLA_PROTO_DOWN_REASON: \
                {payload:?}"
            ))?),
        })
    }
}

impl Nla for LinkProtocolDownReason {
    fn kind(&self) -> u16 {
        match self {
            Self::Value(_) => IFLA_PROTO_DOWN_REASON_VALUE,
            Self::Mask(_) => IFLA_PROTO_DOWN_REASON_MASK,
            Self::Other(v) => v.kind(),
        }
    }

    fn value_len(&self) -> usize {
        match self {
            Self::Value(_) | Self::Mask(_) => 4,
            Self::Other(v) => v.value_len(),
        }
    }

    fn emit_value(&self, buffer: &mut [u8]) {
        match self {
            Self::Value(v) | Self::Mask(v) => NativeEndian::write_u32(buffer, *v),
            Self::Other(v) => v.emit_value(buffer),
        }
    }
}