netlink_packet_route/nsid/
attribute.rs

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1// SPDX-License-Identifier: MIT
2
3use super::NsidError;
4use byteorder::{ByteOrder, NativeEndian};
5use netlink_packet_utils::nla::{DefaultNla, Nla, NlaBuffer};
6use netlink_packet_utils::parsers::{parse_i32, parse_u32};
7use netlink_packet_utils::traits::Parseable;
8
9const NETNSA_NSID: u16 = 1;
10const NETNSA_PID: u16 = 2;
11const NETNSA_FD: u16 = 3;
12const NETNSA_TARGET_NSID: u16 = 4;
13const NETNSA_CURRENT_NSID: u16 = 5;
14
15#[derive(Debug, PartialEq, Eq, Clone)]
16#[non_exhaustive]
17pub enum NsidAttribute {
18    /// -1 means not assigned
19    Id(i32),
20    Pid(u32),
21    Fd(u32),
22    TargetNsid(i32),
23    CurrentNsid(i32),
24    Other(DefaultNla),
25}
26
27impl Nla for NsidAttribute {
28    fn value_len(&self) -> usize {
29        match self {
30            Self::Id(_)
31            | Self::Pid(_)
32            | Self::Fd(_)
33            | Self::TargetNsid(_)
34            | Self::CurrentNsid(_) => 4,
35            Self::Other(attr) => attr.value_len(),
36        }
37    }
38
39    fn emit_value(&self, buffer: &mut [u8]) {
40        match self {
41            Self::Fd(v) | Self::Pid(v) => NativeEndian::write_u32(buffer, *v),
42            Self::Id(v) | Self::TargetNsid(v) | Self::CurrentNsid(v) => {
43                NativeEndian::write_i32(buffer, *v)
44            }
45            Self::Other(attr) => attr.emit_value(buffer),
46        }
47    }
48
49    fn kind(&self) -> u16 {
50        match self {
51            Self::Id(_) => NETNSA_NSID,
52            Self::Pid(_) => NETNSA_PID,
53            Self::Fd(_) => NETNSA_FD,
54            Self::TargetNsid(_) => NETNSA_TARGET_NSID,
55            Self::CurrentNsid(_) => NETNSA_CURRENT_NSID,
56            Self::Other(attr) => attr.kind(),
57        }
58    }
59}
60
61impl<'a, T: AsRef<[u8]> + ?Sized> Parseable<NlaBuffer<&'a T>> for NsidAttribute {
62    type Error = NsidError;
63    fn parse(buf: &NlaBuffer<&'a T>) -> Result<Self, NsidError> {
64        let payload = buf.value();
65        Ok(match buf.kind() {
66            NETNSA_NSID => Self::Id(
67                parse_i32(payload)
68                    .map_err(|error| NsidError::InvalidValue { kind: "NETNSA_NSID", error })?,
69            ),
70            NETNSA_PID => Self::Pid(
71                parse_u32(payload)
72                    .map_err(|error| NsidError::InvalidValue { kind: "NETNSA_PID", error })?,
73            ),
74            NETNSA_FD => Self::Fd(
75                parse_u32(payload)
76                    .map_err(|error| NsidError::InvalidValue { kind: "NETNSA_FD", error })?,
77            ),
78            NETNSA_TARGET_NSID => {
79                Self::TargetNsid(parse_i32(payload).map_err(|error| NsidError::InvalidValue {
80                    kind: "NETNSA_TARGET_NSID",
81                    error,
82                })?)
83            }
84            NETNSA_CURRENT_NSID => {
85                Self::CurrentNsid(parse_i32(payload).map_err(|error| NsidError::InvalidValue {
86                    kind: "NETNSA_CURRENT_NSID",
87                    error,
88                })?)
89            }
90            kind => Self::Other(
91                DefaultNla::parse(buf).map_err(|error| NsidError::UnknownNLA { kind, error })?,
92            ),
93        })
94    }
95}
netlink_packet_route/nsid/attribute.rs

netlink_packet_route/nsid/
attribute.rs
