netlink-packet-route 0.32.1

netlink packet types
Documentation 
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// SPDX-License-Identifier: MIT

use netlink_packet_core::{
    DecodeError, DefaultNla, Emitable, ErrorContext, Nla, NlaBuffer, Parseable,
};

use super::{
    af_spec::AfSpecStats,
    offload::{parse_offload_xstats_inner, OffloadXstat},
    xstats::{LinkXstatGroup, VecLinkXstats},
};
use crate::link::{Stats64, Stats64Buffer};

pub(crate) const IFLA_STATS_LINK_64: u16 = 1;
pub(crate) const IFLA_STATS_LINK_XSTATS: u16 = 2;
pub(crate) const IFLA_STATS_LINK_XSTATS_SLAVE: u16 = 3;
pub(crate) const IFLA_STATS_LINK_OFFLOAD_XSTATS: u16 = 4;
pub(crate) const IFLA_STATS_AF_SPEC: u16 = 5;

#[derive(Debug, PartialEq, Eq, Clone)]
#[non_exhaustive]
pub enum StatsAttribute {
    Link64(Stats64),
    LinkXstats(Vec<LinkXstatGroup>),
    LinkXstatsPort(Vec<LinkXstatGroup>),
    LinkOffloadXstats(Vec<OffloadXstat>),
    AfSpec(AfSpecStats),
    Other(DefaultNla),
}

impl Nla for StatsAttribute {
    fn value_len(&self) -> usize {
        match self {
            Self::Link64(v) => v.buffer_len(),
            Self::LinkXstats(v) | Self::LinkXstatsPort(v) => {
                v.as_slice().buffer_len()
            }
            Self::LinkOffloadXstats(v) => v.as_slice().buffer_len(),
            Self::AfSpec(v) => v.buffer_len(),
            Self::Other(attr) => attr.value_len(),
        }
    }

    fn emit_value(&self, buffer: &mut [u8]) {
        match self {
            Self::Link64(v) => v.emit(buffer),
            Self::LinkXstats(v) | Self::LinkXstatsPort(v) => {
                v.as_slice().emit(buffer)
            }
            Self::LinkOffloadXstats(v) => v.as_slice().emit(buffer),
            Self::AfSpec(v) => v.emit(buffer),
            Self::Other(attr) => attr.emit_value(buffer),
        }
    }

    fn kind(&self) -> u16 {
        match self {
            Self::Link64(_) => IFLA_STATS_LINK_64,
            Self::LinkXstats(_) => IFLA_STATS_LINK_XSTATS,
            Self::LinkXstatsPort(_) => IFLA_STATS_LINK_XSTATS_SLAVE,
            Self::LinkOffloadXstats(_) => IFLA_STATS_LINK_OFFLOAD_XSTATS,
            Self::AfSpec(_) => IFLA_STATS_AF_SPEC,
            Self::Other(attr) => attr.kind(),
        }
    }
}

impl<'a, T: AsRef<[u8]> + ?Sized> Parseable<NlaBuffer<&'a T>>
    for StatsAttribute
{
    fn parse(buf: &NlaBuffer<&'a T>) -> Result<Self, DecodeError> {
        let payload = buf.value();
        Ok(match buf.kind() {
            IFLA_STATS_LINK_64 => Self::Link64(
                Stats64::parse(
                    &Stats64Buffer::new_checked(payload)
                        .context("invalid IFLA_STATS_LINK_64 value")?,
                )
                .context("invalid IFLA_STATS_LINK_64 value")?,
            ),
            IFLA_STATS_LINK_XSTATS => {
                let err = "invalid IFLA_STATS_LINK_XSTATS value";
                Self::LinkXstats(
                    VecLinkXstats::parse(&NlaBuffer::new(payload))
                        .context(err)?
                        .0,
                )
            }
            IFLA_STATS_LINK_XSTATS_SLAVE => {
                let err = "invalid IFLA_STATS_LINK_XSTATS_SLAVE value";
                Self::LinkXstatsPort(
                    VecLinkXstats::parse(&NlaBuffer::new(payload))
                        .context(err)?
                        .0,
                )
            }
            IFLA_STATS_LINK_OFFLOAD_XSTATS => {
                let err = "invalid IFLA_STATS_LINK_OFFLOAD_XSTATS value";
                Self::LinkOffloadXstats(
                    parse_offload_xstats_inner(payload).context(err)?,
                )
            }
            IFLA_STATS_AF_SPEC => Self::AfSpec(
                AfSpecStats::parse(payload).context("invalid AF_SPEC stats")?,
            ),
            kind => Self::Other(
                DefaultNla::parse(buf)
                    .context(format!("unknown IFLA_STATS type {kind}"))?,
            ),
        })
    }
}