1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151

// SPDX-License-Identifier: MIT

use anyhow::Context;
use byteorder::{ByteOrder, NativeEndian};
use std::mem::size_of;

use crate::{
    constants::*,
    nlas::{DefaultNla, Nla, NlaBuffer},
    parsers::parse_u32,
    traits::Parseable,
    DecodeError,
};

#[derive(Debug, PartialEq, Eq, Clone)]
pub enum Metrics {
    Unspec(Vec<u8>),
    Lock(u32),
    Mtu(u32),
    Window(u32),
    Rtt(u32),
    RttVar(u32),
    SsThresh(u32),
    Cwnd(u32),
    Advmss(u32),
    Reordering(u32),
    Hoplimit(u32),
    InitCwnd(u32),
    Features(u32),
    RtoMin(u32),
    InitRwnd(u32),
    QuickAck(u32),
    CcAlgo(u32),
    FastopenNoCookie(u32),
    Other(DefaultNla),
}

impl Nla for Metrics {
    #[rustfmt::skip]
    fn value_len(&self) -> usize {
        use self::Metrics::*;
        match *self {
            Unspec(ref bytes) => bytes.len(),
            Lock(_)
                | Mtu(_)
                | Window(_)
                | Rtt(_)
                | RttVar(_)
                | SsThresh(_)
                | Cwnd(_)
                | Advmss(_)
                | Reordering(_)
                | Hoplimit(_)
                | InitCwnd(_)
                | Features(_)
                | RtoMin(_)
                | InitRwnd(_)
                | QuickAck(_)
                | CcAlgo(_)
                | FastopenNoCookie(_)
                => size_of::<u32>(),
            Other(ref attr) => attr.value_len(),
        }
    }

    #[rustfmt::skip]
    fn emit_value(&self, buffer: &mut [u8]) {
        use self::Metrics::*;
        match *self {
            Unspec(ref bytes) => buffer.copy_from_slice(bytes.as_slice()),

            Lock(value)
                | Mtu(value)
                | Window(value)
                | Rtt(value)
                | RttVar(value)
                | SsThresh(value)
                | Cwnd(value)
                | Advmss(value)
                | Reordering(value)
                | Hoplimit(value)
                | InitCwnd(value)
                | Features(value)
                | RtoMin(value)
                | InitRwnd(value)
                | QuickAck(value)
                | CcAlgo(value)
                | FastopenNoCookie(value)
                => NativeEndian::write_u32(buffer, value),

            Other(ref attr) => attr.emit_value(buffer),
        }
    }

    fn kind(&self) -> u16 {
        use self::Metrics::*;
        match *self {
            Unspec(_) => RTAX_UNSPEC,
            Lock(_) => RTAX_LOCK,
            Mtu(_) => RTAX_MTU,
            Window(_) => RTAX_WINDOW,
            Rtt(_) => RTAX_RTT,
            RttVar(_) => RTAX_RTTVAR,
            SsThresh(_) => RTAX_SSTHRESH,
            Cwnd(_) => RTAX_CWND,
            Advmss(_) => RTAX_ADVMSS,
            Reordering(_) => RTAX_REORDERING,
            Hoplimit(_) => RTAX_HOPLIMIT,
            InitCwnd(_) => RTAX_INITCWND,
            Features(_) => RTAX_FEATURES,
            RtoMin(_) => RTAX_RTO_MIN,
            InitRwnd(_) => RTAX_INITRWND,
            QuickAck(_) => RTAX_QUICKACK,
            CcAlgo(_) => RTAX_CC_ALGO,
            FastopenNoCookie(_) => RTAX_FASTOPEN_NO_COOKIE,
            Other(ref attr) => attr.kind(),
        }
    }
}

impl<'a, T: AsRef<[u8]> + ?Sized> Parseable<NlaBuffer<&'a T>> for Metrics {
    fn parse(buf: &NlaBuffer<&'a T>) -> Result<Self, DecodeError> {
        use self::Metrics::*;
        let payload = buf.value();
        Ok(match buf.kind() {
            RTAX_UNSPEC => Unspec(payload.to_vec()),
            RTAX_LOCK => Lock(parse_u32(payload).context("invalid RTAX_LOCK value")?),
            RTAX_MTU => Mtu(parse_u32(payload).context("invalid RTAX_MTU value")?),
            RTAX_WINDOW => Window(parse_u32(payload).context("invalid RTAX_WINDOW value")?),
            RTAX_RTT => Rtt(parse_u32(payload).context("invalid RTAX_RTT value")?),
            RTAX_RTTVAR => RttVar(parse_u32(payload).context("invalid RTAX_RTTVAR value")?),
            RTAX_SSTHRESH => SsThresh(parse_u32(payload).context("invalid RTAX_SSTHRESH value")?),
            RTAX_CWND => Cwnd(parse_u32(payload).context("invalid RTAX_CWND value")?),
            RTAX_ADVMSS => Advmss(parse_u32(payload).context("invalid RTAX_ADVMSS value")?),
            RTAX_REORDERING => {
                Reordering(parse_u32(payload).context("invalid RTAX_REORDERING value")?)
            }
            RTAX_HOPLIMIT => Hoplimit(parse_u32(payload).context("invalid RTAX_HOPLIMIT value")?),
            RTAX_INITCWND => InitCwnd(parse_u32(payload).context("invalid RTAX_INITCWND value")?),
            RTAX_FEATURES => Features(parse_u32(payload).context("invalid RTAX_FEATURES value")?),
            RTAX_RTO_MIN => RtoMin(parse_u32(payload).context("invalid RTAX_RTO_MIN value")?),
            RTAX_INITRWND => InitRwnd(parse_u32(payload).context("invalid RTAX_INITRWND value")?),
            RTAX_QUICKACK => QuickAck(parse_u32(payload).context("invalid RTAX_QUICKACK value")?),
            RTAX_CC_ALGO => CcAlgo(parse_u32(payload).context("invalid RTAX_CC_ALGO value")?),
            RTAX_FASTOPEN_NO_COOKIE => FastopenNoCookie(
                parse_u32(payload).context("invalid RTAX_FASTOPEN_NO_COOKIE value")?,
            ),
            _ => Other(DefaultNla::parse(buf).context("invalid NLA value (unknown type) value")?),
        })
    }
}