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
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use std::fmt::Debug;
use enum_map::Enum;
/// ECN (Explicit Congestion Notification) codepoints mapped to the
/// lower 2 bits of the TOS field.
/// <https://www.iana.org/assignments/dscp-registry/dscp-registry.xhtml>
#[derive(Copy, Clone, PartialEq, Eq, Enum, Default, Debug)]
#[repr(u8)]
pub enum IpTosEcn {
#[default]
/// Not-ECT, Not ECN-Capable Transport, RFC3168
NotEct = 0b00,
/// ECT(1), ECN-Capable Transport(1), RFC8311 and RFC9331
Ect1 = 0b01,
/// ECT(0), ECN-Capable Transport(0), RFC3168
Ect0 = 0b10,
/// CE, Congestion Experienced, RFC3168
Ce = 0b11,
}
impl From<IpTosEcn> for u8 {
fn from(v: IpTosEcn) -> Self {
v as u8
}
}
impl From<u8> for IpTosEcn {
fn from(v: u8) -> Self {
match v & 0b0000_0011 {
0b00 => IpTosEcn::NotEct,
0b01 => IpTosEcn::Ect1,
0b10 => IpTosEcn::Ect0,
0b11 => IpTosEcn::Ce,
_ => unreachable!(),
}
}
}
impl From<IpTos> for IpTosEcn {
fn from(v: IpTos) -> Self {
IpTosEcn::from(u8::from(v))
}
}
impl IpTosEcn {
#[must_use]
pub fn is_ecn_marked(&self) -> bool {
match self {
IpTosEcn::Ect0 | IpTosEcn::Ect1 | IpTosEcn::Ce => true,
IpTosEcn::NotEct => false,
}
}
}
/// Diffserv Codepoints, mapped to the upper six bits of the TOS field.
/// <https://www.iana.org/assignments/dscp-registry/dscp-registry.xhtml>
#[derive(Copy, Clone, PartialEq, Eq, Enum, Default, Debug)]
#[repr(u8)]
pub enum IpTosDscp {
#[default]
/// Class Selector 0, RFC2474
Cs0 = 0b0000_0000,
/// Class Selector 1, RFC2474
Cs1 = 0b0010_0000,
/// Class Selector 2, RFC2474
Cs2 = 0b0100_0000,
/// Class Selector 3, RFC2474
Cs3 = 0b0110_0000,
/// Class Selector 4, RFC2474
Cs4 = 0b1000_0000,
/// Class Selector 5, RFC2474
Cs5 = 0b1010_0000,
/// Class Selector 6, RFC2474
Cs6 = 0b1100_0000,
/// Class Selector 7, RFC2474
Cs7 = 0b1110_0000,
/// Assured Forwarding 11, RFC2597
Af11 = 0b0010_1000,
/// Assured Forwarding 12, RFC2597
Af12 = 0b0011_0000,
/// Assured Forwarding 13, RFC2597
Af13 = 0b0011_1000,
/// Assured Forwarding 21, RFC2597
Af21 = 0b0100_1000,
/// Assured Forwarding 22, RFC2597
Af22 = 0b0101_0000,
/// Assured Forwarding 23, RFC2597
Af23 = 0b0101_1000,
/// Assured Forwarding 31, RFC2597
Af31 = 0b0110_1000,
/// Assured Forwarding 32, RFC2597
Af32 = 0b0111_0000,
/// Assured Forwarding 33, RFC2597
Af33 = 0b0111_1000,
/// Assured Forwarding 41, RFC2597
Af41 = 0b1000_1000,
/// Assured Forwarding 42, RFC2597
Af42 = 0b1001_0000,
/// Assured Forwarding 43, RFC2597
Af43 = 0b1001_1000,
/// Expedited Forwarding, RFC3246
Ef = 0b1011_1000,
/// Capacity-Admitted Traffic, RFC5865
VoiceAdmit = 0b1011_0000,
/// Lower-Effort, RFC8622
Le = 0b0000_0100,
}
impl From<IpTosDscp> for u8 {
fn from(v: IpTosDscp) -> Self {
v as u8
}
}
impl From<u8> for IpTosDscp {
fn from(v: u8) -> Self {
match v & 0b1111_1100 {
0b0000_0000 => IpTosDscp::Cs0,
0b0010_0000 => IpTosDscp::Cs1,
0b0100_0000 => IpTosDscp::Cs2,
0b0110_0000 => IpTosDscp::Cs3,
0b1000_0000 => IpTosDscp::Cs4,
0b1010_0000 => IpTosDscp::Cs5,
0b1100_0000 => IpTosDscp::Cs6,
0b1110_0000 => IpTosDscp::Cs7,
0b0010_1000 => IpTosDscp::Af11,
0b0011_0000 => IpTosDscp::Af12,
0b0011_1000 => IpTosDscp::Af13,
0b0100_1000 => IpTosDscp::Af21,
0b0101_0000 => IpTosDscp::Af22,
0b0101_1000 => IpTosDscp::Af23,
0b0110_1000 => IpTosDscp::Af31,
0b0111_0000 => IpTosDscp::Af32,
0b0111_1000 => IpTosDscp::Af33,
0b1000_1000 => IpTosDscp::Af41,
0b1001_0000 => IpTosDscp::Af42,
0b1001_1000 => IpTosDscp::Af43,
0b1011_1000 => IpTosDscp::Ef,
0b1011_0000 => IpTosDscp::VoiceAdmit,
0b0000_0100 => IpTosDscp::Le,
_ => unreachable!(),
}
}
}
impl From<IpTos> for IpTosDscp {
fn from(v: IpTos) -> Self {
IpTosDscp::from(u8::from(v))
}
}
/// The type-of-service field in an IP packet.
#[derive(Copy, Clone, PartialEq, Eq, Default)]
pub struct IpTos(u8);
impl From<IpTosEcn> for IpTos {
fn from(v: IpTosEcn) -> Self {
Self(u8::from(v))
}
}
impl From<IpTosDscp> for IpTos {
fn from(v: IpTosDscp) -> Self {
Self(u8::from(v))
}
}
impl From<(IpTosDscp, IpTosEcn)> for IpTos {
fn from(v: (IpTosDscp, IpTosEcn)) -> Self {
Self(u8::from(v.0) | u8::from(v.1))
}
}
impl From<(IpTosEcn, IpTosDscp)> for IpTos {
fn from(v: (IpTosEcn, IpTosDscp)) -> Self {
Self(u8::from(v.0) | u8::from(v.1))
}
}
impl From<IpTos> for u8 {
fn from(v: IpTos) -> Self {
v.0
}
}
impl From<u8> for IpTos {
fn from(v: u8) -> Self {
Self(v)
}
}
impl Debug for IpTos {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_tuple("IpTos")
.field(&IpTosDscp::from(*self))
.field(&IpTosEcn::from(*self))
.finish()
}
}
impl IpTos {
pub fn set_ecn(&mut self, ecn: IpTosEcn) {
self.0 = u8::from(IpTosDscp::from(*self)) | u8::from(ecn);
}
pub fn set_dscp(&mut self, dscp: IpTosDscp) {
self.0 = u8::from(IpTosEcn::from(*self)) | u8::from(dscp);
}
#[must_use]
pub fn is_ecn_marked(&self) -> bool {
IpTosEcn::from(*self).is_ecn_marked()
}
}
#[cfg(test)]
mod tests {
use crate::{IpTos, IpTosDscp, IpTosEcn};
#[test]
fn iptosecn_into_u8() {
assert_eq!(u8::from(IpTosEcn::NotEct), 0b00);
assert_eq!(u8::from(IpTosEcn::Ect1), 0b01);
assert_eq!(u8::from(IpTosEcn::Ect0), 0b10);
assert_eq!(u8::from(IpTosEcn::Ce), 0b11);
}
#[test]
fn u8_into_iptosecn() {
assert_eq!(IpTosEcn::from(0b00), IpTosEcn::NotEct);
assert_eq!(IpTosEcn::from(0b01), IpTosEcn::Ect1);
assert_eq!(IpTosEcn::from(0b10), IpTosEcn::Ect0);
assert_eq!(IpTosEcn::from(0b11), IpTosEcn::Ce);
}
#[test]
fn iptosdscp_into_u8() {
assert_eq!(u8::from(IpTosDscp::Cs0), 0b0000_0000);
assert_eq!(u8::from(IpTosDscp::Cs1), 0b0010_0000);
assert_eq!(u8::from(IpTosDscp::Cs2), 0b0100_0000);
assert_eq!(u8::from(IpTosDscp::Cs3), 0b0110_0000);
assert_eq!(u8::from(IpTosDscp::Cs4), 0b1000_0000);
assert_eq!(u8::from(IpTosDscp::Cs5), 0b1010_0000);
assert_eq!(u8::from(IpTosDscp::Cs6), 0b1100_0000);
assert_eq!(u8::from(IpTosDscp::Cs7), 0b1110_0000);
assert_eq!(u8::from(IpTosDscp::Af11), 0b0010_1000);
assert_eq!(u8::from(IpTosDscp::Af12), 0b0011_0000);
assert_eq!(u8::from(IpTosDscp::Af13), 0b0011_1000);
assert_eq!(u8::from(IpTosDscp::Af21), 0b0100_1000);
assert_eq!(u8::from(IpTosDscp::Af22), 0b0101_0000);
assert_eq!(u8::from(IpTosDscp::Af23), 0b0101_1000);
assert_eq!(u8::from(IpTosDscp::Af31), 0b0110_1000);
assert_eq!(u8::from(IpTosDscp::Af32), 0b0111_0000);
assert_eq!(u8::from(IpTosDscp::Af33), 0b0111_1000);
assert_eq!(u8::from(IpTosDscp::Af41), 0b1000_1000);
assert_eq!(u8::from(IpTosDscp::Af42), 0b1001_0000);
assert_eq!(u8::from(IpTosDscp::Af43), 0b1001_1000);
assert_eq!(u8::from(IpTosDscp::Ef), 0b1011_1000);
assert_eq!(u8::from(IpTosDscp::VoiceAdmit), 0b1011_0000);
assert_eq!(u8::from(IpTosDscp::Le), 0b0000_0100);
}
#[test]
fn u8_into_iptosdscp() {
assert_eq!(IpTosDscp::from(0b0000_0000), IpTosDscp::Cs0);
assert_eq!(IpTosDscp::from(0b0010_0000), IpTosDscp::Cs1);
assert_eq!(IpTosDscp::from(0b0100_0000), IpTosDscp::Cs2);
assert_eq!(IpTosDscp::from(0b0110_0000), IpTosDscp::Cs3);
assert_eq!(IpTosDscp::from(0b1000_0000), IpTosDscp::Cs4);
assert_eq!(IpTosDscp::from(0b1010_0000), IpTosDscp::Cs5);
assert_eq!(IpTosDscp::from(0b1100_0000), IpTosDscp::Cs6);
assert_eq!(IpTosDscp::from(0b1110_0000), IpTosDscp::Cs7);
assert_eq!(IpTosDscp::from(0b0010_1000), IpTosDscp::Af11);
assert_eq!(IpTosDscp::from(0b0011_0000), IpTosDscp::Af12);
assert_eq!(IpTosDscp::from(0b0011_1000), IpTosDscp::Af13);
assert_eq!(IpTosDscp::from(0b0100_1000), IpTosDscp::Af21);
assert_eq!(IpTosDscp::from(0b0101_0000), IpTosDscp::Af22);
assert_eq!(IpTosDscp::from(0b0101_1000), IpTosDscp::Af23);
assert_eq!(IpTosDscp::from(0b0110_1000), IpTosDscp::Af31);
assert_eq!(IpTosDscp::from(0b0111_0000), IpTosDscp::Af32);
assert_eq!(IpTosDscp::from(0b0111_1000), IpTosDscp::Af33);
assert_eq!(IpTosDscp::from(0b1000_1000), IpTosDscp::Af41);
assert_eq!(IpTosDscp::from(0b1001_0000), IpTosDscp::Af42);
assert_eq!(IpTosDscp::from(0b1001_1000), IpTosDscp::Af43);
assert_eq!(IpTosDscp::from(0b1011_1000), IpTosDscp::Ef);
assert_eq!(IpTosDscp::from(0b1011_0000), IpTosDscp::VoiceAdmit);
assert_eq!(IpTosDscp::from(0b0000_0100), IpTosDscp::Le);
}
#[test]
fn iptosecn_into_iptos() {
let ecn = IpTosEcn::default();
let iptos_ecn: IpTos = ecn.into();
assert_eq!(u8::from(iptos_ecn), ecn as u8);
}
#[test]
fn iptosdscp_into_iptos() {
let dscp = IpTosDscp::default();
let iptos_dscp: IpTos = dscp.into();
assert_eq!(u8::from(iptos_dscp), dscp as u8);
}
#[test]
fn u8_to_iptos() {
let tos = 0x8b;
let iptos: IpTos = (IpTosEcn::Ce, IpTosDscp::Af41).into();
assert_eq!(tos, u8::from(iptos));
assert_eq!(IpTos::from(tos), iptos);
}
#[test]
fn iptos_to_iptosdscp() {
let tos = IpTos::from((IpTosDscp::Af41, IpTosEcn::NotEct));
let dscp = IpTosDscp::from(tos);
assert_eq!(dscp, IpTosDscp::Af41);
}
#[test]
fn tos_modify_ecn() {
let mut iptos: IpTos = (IpTosDscp::Af41, IpTosEcn::NotEct).into();
iptos.set_ecn(IpTosEcn::Ce);
assert_eq!(u8::from(iptos), 0b1000_1011);
}
#[test]
fn tos_modify_dscp() {
let mut iptos: IpTos = (IpTosDscp::Af41, IpTosEcn::Ect1).into();
iptos.set_dscp(IpTosDscp::Le);
assert_eq!(u8::from(iptos), 0b0000_0101);
}
#[test]
fn iptos_is_ecn_marked() {
let iptos: IpTos = (IpTosDscp::Af41, IpTosEcn::Ce).into();
assert!(iptos.is_ecn_marked());
}
#[test]
fn iptosecn_is_ecn_marked() {
assert!(IpTosEcn::Ce.is_ecn_marked());
assert!(!IpTosEcn::NotEct.is_ecn_marked());
}
}
|
