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
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
use crate::*;
/// Laxly parsed payload together with an identifier the type of content & the
/// information if the payload is incomplete.
#[derive(Debug, Clone, Eq, PartialEq, Hash, PartialOrd, Ord)]
pub enum LaxPayloadSlice<'a> {
/// No specific payload (e.g. ARP packet).
Empty,
/// Payload with it's type identified by an ether type number
/// (e.g. after an ethernet II or vlan header).
Ether(LaxEtherPayloadSlice<'a>),
/// MACsec modified payload (either by encryption or other algorithm).
MacsecModified {
payload: &'a [u8],
/// True if the payload has been cut off.
incomplete: bool,
},
/// Payload with is's type identified by an ip number (e.g.
/// after an IP header or after an)
Ip(LaxIpPayloadSlice<'a>),
/// UDP payload.
Udp {
payload: &'a [u8],
/// True if the payload has been cut off.
incomplete: bool,
},
/// TCP payload.
Tcp {
payload: &'a [u8],
/// True if the payload has been cut off.
incomplete: bool,
},
/// Payload part of an ICMP V4 message. Check [`crate::Icmpv4Type`]
/// for a description what will be part of the payload.
Icmpv4 {
payload: &'a [u8],
/// True if the payload has been cut off.
incomplete: bool,
},
/// Payload part of an ICMP V4 message. Check [`crate::Icmpv6Type`]
/// for a description what will be part of the payload.
Icmpv6 {
payload: &'a [u8],
/// True if the payload has been cut off.
incomplete: bool,
},
}
impl<'a> LaxPayloadSlice<'a> {
pub fn slice(&self) -> &'a [u8] {
match self {
LaxPayloadSlice::Empty => &[],
LaxPayloadSlice::Ether(e) => e.payload,
LaxPayloadSlice::MacsecModified {
payload,
incomplete: _,
} => payload,
LaxPayloadSlice::Ip(i) => i.payload,
LaxPayloadSlice::Udp {
payload,
incomplete: _,
} => payload,
LaxPayloadSlice::Tcp {
payload,
incomplete: _,
} => payload,
LaxPayloadSlice::Icmpv4 {
payload,
incomplete: _,
} => payload,
LaxPayloadSlice::Icmpv6 {
payload,
incomplete: _,
} => payload,
}
}
}
#[cfg(test)]
mod test {
use super::*;
use alloc::format;
#[test]
fn debug() {
assert_eq!(
format!("Udp {{ payload: {:?}, incomplete: {} }}", &[0u8; 0], false),
format!(
"{:?}",
LaxPayloadSlice::Udp {
payload: &[],
incomplete: false
}
)
);
}
#[test]
fn clone_eq_hash_ord() {
let s = LaxPayloadSlice::Udp {
payload: &[],
incomplete: false,
};
assert_eq!(s.clone(), s);
use std::collections::hash_map::DefaultHasher;
use std::hash::{Hash, Hasher};
let a_hash = {
let mut hasher = DefaultHasher::new();
s.hash(&mut hasher);
hasher.finish()
};
let b_hash = {
let mut hasher = DefaultHasher::new();
s.clone().hash(&mut hasher);
hasher.finish()
};
assert_eq!(a_hash, b_hash);
use std::cmp::Ordering;
assert_eq!(s.clone().cmp(&s), Ordering::Equal);
assert_eq!(s.clone().partial_cmp(&s), Some(Ordering::Equal));
}
#[test]
fn slice() {
let payload = [1, 2, 3, 4];
use LaxPayloadSlice::*;
assert_eq!(
Ether(LaxEtherPayloadSlice {
incomplete: false,
ether_type: EtherType::IPV4,
len_source: LenSource::Slice,
payload: &payload,
})
.slice(),
&payload
);
assert_eq!(
MacsecModified {
payload: &payload,
incomplete: false,
}
.slice(),
&payload
);
assert_eq!(
Ip(LaxIpPayloadSlice {
ip_number: IpNumber::IPV4,
fragmented: false,
len_source: LenSource::Slice,
payload: &payload,
incomplete: true,
})
.slice(),
&payload
);
assert_eq!(
Udp {
payload: &payload,
incomplete: false
}
.slice(),
&payload
);
assert_eq!(
Tcp {
payload: &payload,
incomplete: false
}
.slice(),
&payload
);
assert_eq!(
Icmpv4 {
payload: &payload,
incomplete: false
}
.slice(),
&payload
);
assert_eq!(
Icmpv6 {
payload: &payload,
incomplete: false
}
.slice(),
&payload
);
}
}