netlink_packet_route/nsid/
attribute.rs

// SPDX-License-Identifier: MIT

use super::NsidError;
use byteorder::{ByteOrder, NativeEndian};
use netlink_packet_utils::nla::{DefaultNla, Nla, NlaBuffer};
use netlink_packet_utils::parsers::{parse_i32, parse_u32};
use netlink_packet_utils::traits::Parseable;

const NETNSA_NSID: u16 = 1;
const NETNSA_PID: u16 = 2;
const NETNSA_FD: u16 = 3;
const NETNSA_TARGET_NSID: u16 = 4;
const NETNSA_CURRENT_NSID: u16 = 5;

#[derive(Debug, PartialEq, Eq, Clone)]
#[non_exhaustive]
pub enum NsidAttribute {
    /// -1 means not assigned
    Id(i32),
    Pid(u32),
    Fd(u32),
    TargetNsid(i32),
    CurrentNsid(i32),
    Other(DefaultNla),
}

impl Nla for NsidAttribute {
    fn value_len(&self) -> usize {
        match self {
            Self::Id(_)
            | Self::Pid(_)
            | Self::Fd(_)
            | Self::TargetNsid(_)
            | Self::CurrentNsid(_) => 4,
            Self::Other(attr) => attr.value_len(),
        }
    }

    fn emit_value(&self, buffer: &mut [u8]) {
        match self {
            Self::Fd(v) | Self::Pid(v) => NativeEndian::write_u32(buffer, *v),
            Self::Id(v) | Self::TargetNsid(v) | Self::CurrentNsid(v) => {
                NativeEndian::write_i32(buffer, *v)
            }
            Self::Other(attr) => attr.emit_value(buffer),
        }
    }

    fn kind(&self) -> u16 {
        match self {
            Self::Id(_) => NETNSA_NSID,
            Self::Pid(_) => NETNSA_PID,
            Self::Fd(_) => NETNSA_FD,
            Self::TargetNsid(_) => NETNSA_TARGET_NSID,
            Self::CurrentNsid(_) => NETNSA_CURRENT_NSID,
            Self::Other(attr) => attr.kind(),
        }
    }
}

impl<'a, T: AsRef<[u8]> + ?Sized> Parseable<NlaBuffer<&'a T>> for NsidAttribute {
    type Error = NsidError;
    fn parse(buf: &NlaBuffer<&'a T>) -> Result<Self, NsidError> {
        let payload = buf.value();
        Ok(match buf.kind() {
            NETNSA_NSID => Self::Id(
                parse_i32(payload)
                    .map_err(|error| NsidError::InvalidValue { kind: "NETNSA_NSID", error })?,
            ),
            NETNSA_PID => Self::Pid(
                parse_u32(payload)
                    .map_err(|error| NsidError::InvalidValue { kind: "NETNSA_PID", error })?,
            ),
            NETNSA_FD => Self::Fd(
                parse_u32(payload)
                    .map_err(|error| NsidError::InvalidValue { kind: "NETNSA_FD", error })?,
            ),
            NETNSA_TARGET_NSID => {
                Self::TargetNsid(parse_i32(payload).map_err(|error| NsidError::InvalidValue {
                    kind: "NETNSA_TARGET_NSID",
                    error,
                })?)
            }
            NETNSA_CURRENT_NSID => {
                Self::CurrentNsid(parse_i32(payload).map_err(|error| NsidError::InvalidValue {
                    kind: "NETNSA_CURRENT_NSID",
                    error,
                })?)
            }
            kind => Self::Other(
                DefaultNla::parse(buf).map_err(|error| NsidError::UnknownNLA { kind, error })?,
            ),
        })
    }
}
netlink_packet_route/nsid/attribute.rs

netlink_packet_route/nsid/
attribute.rs
