iprfc 0.2.3

Known RFCs for IP addresses
Documentation 
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

use core::net::{IpAddr, Ipv4Addr, Ipv6Addr};

/// Returns `true` if the IPv4 address is in `127.0.0.0/8`.
#[inline]
pub const fn is_loopback_ipv4_addr(ip: Ipv4Addr) -> bool {
  let [a, _, _, _] = ip.octets();
  a == 127
}

/// Returns `true` if the IPv6 address is `::1/128`.
#[inline]
pub const fn is_loopback_ipv6_addr(ip: Ipv6Addr) -> bool {
  let segments = ip.segments();
  segments[0] == 0
    && segments[1] == 0
    && segments[2] == 0
    && segments[3] == 0
    && segments[4] == 0
    && segments[5] == 0
    && segments[6] == 0
    && segments[7] == 1
}

/// Returns `true` if the IP address is loopback.
#[inline]
pub const fn is_loopback_ip_addr(ip: IpAddr) -> bool {
  match ip {
    IpAddr::V4(ip) => is_loopback_ipv4_addr(ip),
    IpAddr::V6(ip) => is_loopback_ipv6_addr(ip),
  }
}

/// Returns `true` if the IPv4 address is in RFC 1918 private-use space.
#[inline]
pub const fn is_private_ipv4_addr(ip: Ipv4Addr) -> bool {
  let [a, b, _, _] = ip.octets();
  a == 10 || (a == 172 && b >= 16 && b <= 31) || (a == 192 && b == 168)
}

/// Returns `true` if the IPv6 address is in RFC 4193 unique-local space.
#[inline]
pub const fn is_unique_local_ipv6_addr(ip: Ipv6Addr) -> bool {
  let segments = ip.segments();
  segments[0] & 0xfe00 == 0xfc00
}

/// Returns `true` if the IP address is RFC 1918 private-use or RFC 4193 unique-local.
#[inline]
pub const fn is_private_ip_addr(ip: IpAddr) -> bool {
  match ip {
    IpAddr::V4(ip) => is_private_ipv4_addr(ip),
    IpAddr::V6(ip) => is_unique_local_ipv6_addr(ip),
  }
}

/// Returns `true` if the IPv4 address is in RFC 3927 link-local space.
#[inline]
pub const fn is_link_local_ipv4_addr(ip: Ipv4Addr) -> bool {
  let [a, b, _, _] = ip.octets();
  a == 169 && b == 254
}

/// Returns `true` if the IPv6 address is in `fe80::/10` link-local space.
#[inline]
pub const fn is_link_local_ipv6_addr(ip: Ipv6Addr) -> bool {
  let segments = ip.segments();
  segments[0] & 0xffc0 == 0xfe80
}

/// Returns `true` if the IP address is link-local.
#[inline]
pub const fn is_link_local_ip_addr(ip: IpAddr) -> bool {
  match ip {
    IpAddr::V4(ip) => is_link_local_ipv4_addr(ip),
    IpAddr::V6(ip) => is_link_local_ipv6_addr(ip),
  }
}

/// Returns `true` if the IPv4 address is in an RFC 5737 documentation block.
#[inline]
pub const fn is_documentation_ipv4_addr(ip: Ipv4Addr) -> bool {
  let [a, b, c, _] = ip.octets();
  (a == 192 && b == 0 && c == 2)
    || (a == 198 && b == 51 && c == 100)
    || (a == 203 && b == 0 && c == 113)
}

/// Returns `true` if the IPv6 address is in an RFC 3849 or RFC 9637 documentation block.
#[inline]
pub const fn is_documentation_ipv6_addr(ip: Ipv6Addr) -> bool {
  let segments = ip.segments();
  (segments[0] == 0x2001 && segments[1] == 0x0db8)
    || (segments[0] == 0x3fff && segments[1] <= 0x0fff)
}

/// Returns `true` if the IP address is reserved for documentation or examples.
#[inline]
pub const fn is_documentation_ip_addr(ip: IpAddr) -> bool {
  match ip {
    IpAddr::V4(ip) => is_documentation_ipv4_addr(ip),
    IpAddr::V6(ip) => is_documentation_ipv6_addr(ip),
  }
}

/// Returns `true` if the IPv4 address is in RFC 2544 benchmarking space.
#[inline]
pub const fn is_benchmark_ipv4_addr(ip: Ipv4Addr) -> bool {
  let [a, b, _, _] = ip.octets();
  a == 198 && (b == 18 || b == 19)
}

/// Returns `true` if the IPv6 address is in RFC 5180 benchmarking space.
#[inline]
pub const fn is_benchmark_ipv6_addr(ip: Ipv6Addr) -> bool {
  let segments = ip.segments();
  segments[0] == 0x2001 && segments[1] == 0x0002 && segments[2] == 0
}

/// Returns `true` if the IP address is reserved for benchmarking.
#[inline]
pub const fn is_benchmark_ip_addr(ip: IpAddr) -> bool {
  match ip {
    IpAddr::V4(ip) => is_benchmark_ipv4_addr(ip),
    IpAddr::V6(ip) => is_benchmark_ipv6_addr(ip),
  }
}

/// Returns `true` if the IPv4 address is in RFC 6598 shared address space.
#[inline]
pub const fn is_shared_ipv4_addr(ip: Ipv4Addr) -> bool {
  let [a, b, _, _] = ip.octets();
  a == 100 && b >= 64 && b <= 127
}

/// Returns `true` if the IP address is in shared address space.
#[inline]
pub const fn is_shared_ip_addr(ip: IpAddr) -> bool {
  match ip {
    IpAddr::V4(ip) => is_shared_ipv4_addr(ip),
    IpAddr::V6(_) => false,
  }
}

/// Returns `true` if the IPv4 address is multicast.
#[inline]
pub const fn is_multicast_ipv4_addr(ip: Ipv4Addr) -> bool {
  let [a, _, _, _] = ip.octets();
  a >= 224 && a <= 239
}

/// Returns `true` if the IPv6 address is multicast.
#[inline]
pub const fn is_multicast_ipv6_addr(ip: Ipv6Addr) -> bool {
  let segments = ip.segments();
  segments[0] & 0xff00 == 0xff00
}

/// Returns `true` if the IP address is multicast.
#[inline]
pub const fn is_multicast_ip_addr(ip: IpAddr) -> bool {
  match ip {
    IpAddr::V4(ip) => is_multicast_ipv4_addr(ip),
    IpAddr::V6(ip) => is_multicast_ipv6_addr(ip),
  }
}

/// Returns `true` if the IPv4 address is exactly `0.0.0.0/32`.
#[inline]
pub const fn is_unspecified_ipv4_addr(ip: Ipv4Addr) -> bool {
  let [a, b, c, d] = ip.octets();
  a == 0 && b == 0 && c == 0 && d == 0
}

/// Returns `true` if the IPv6 address is exactly `::/128`.
#[inline]
pub const fn is_unspecified_ipv6_addr(ip: Ipv6Addr) -> bool {
  let segments = ip.segments();
  segments[0] == 0
    && segments[1] == 0
    && segments[2] == 0
    && segments[3] == 0
    && segments[4] == 0
    && segments[5] == 0
    && segments[6] == 0
    && segments[7] == 0
}

/// Returns `true` if the IP address is the exact unspecified address.
#[inline]
pub const fn is_unspecified_ip_addr(ip: IpAddr) -> bool {
  match ip {
    IpAddr::V4(ip) => is_unspecified_ipv4_addr(ip),
    IpAddr::V6(ip) => is_unspecified_ipv6_addr(ip),
  }
}

/// Returns `true` if the IPv4 address is exactly `255.255.255.255/32`.
#[inline]
pub const fn is_broadcast_ipv4_addr(ip: Ipv4Addr) -> bool {
  let [a, b, c, d] = ip.octets();
  a == 255 && b == 255 && c == 255 && d == 255
}

/// Returns `true` if the IP address is the IPv4 limited broadcast address.
#[inline]
pub const fn is_broadcast_ip_addr(ip: IpAddr) -> bool {
  match ip {
    IpAddr::V4(ip) => is_broadcast_ipv4_addr(ip),
    IpAddr::V6(_) => false,
  }
}

#[cfg(test)]
mod tests {
  use super::*;

  fn ip(s: &str) -> IpAddr {
    s.parse().unwrap()
  }

  fn ipv6(s: &str) -> Ipv6Addr {
    s.parse().unwrap()
  }

  macro_rules! assert_class {
    ($predicate:ident, [$($valid:literal),+ $(,)?], [$($invalid:literal),+ $(,)?]) => {{
      $(assert!($predicate(ip($valid)), "{} should match", $valid);)+
      $(assert!(!$predicate(ip($invalid)), "{} should not match", $invalid);)+
    }};
  }

  #[test]
  fn common_semantic_classes_match_boundaries() {
    assert_class!(
      is_loopback_ip_addr,
      ["127.0.0.1", "127.255.255.255", "::1"],
      ["126.255.255.255", "128.0.0.0", "::2"]
    );
    assert_class!(
      is_private_ip_addr,
      [
        "10.0.0.0",
        "10.255.255.255",
        "172.16.0.0",
        "172.31.255.255",
        "192.168.0.0",
        "192.168.255.255",
        "fc00::",
        "fdff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"
      ],
      [
        "9.255.255.255",
        "11.0.0.0",
        "172.15.255.255",
        "172.32.0.0",
        "192.167.255.255",
        "192.169.0.0",
        "fbff:ffff::",
        "fe00::"
      ]
    );
    assert_class!(
      is_link_local_ip_addr,
      [
        "169.254.0.0",
        "169.254.255.255",
        "fe80::",
        "febf:ffff:ffff:ffff:ffff:ffff:ffff:ffff"
      ],
      ["169.253.255.255", "169.255.0.0", "fe7f:ffff::", "fec0::"]
    );
    assert_class!(
      is_documentation_ip_addr,
      [
        "192.0.2.0",
        "192.0.2.255",
        "198.51.100.0",
        "198.51.100.255",
        "203.0.113.0",
        "203.0.113.255",
        "2001:db8::",
        "2001:db8:ffff:ffff:ffff:ffff:ffff:ffff",
        "3fff::",
        "3fff:0fff:ffff:ffff:ffff:ffff:ffff:ffff"
      ],
      [
        "192.0.1.255",
        "192.0.3.0",
        "198.51.99.255",
        "198.51.101.0",
        "203.0.112.255",
        "203.0.114.0",
        "2001:db7:ffff::",
        "2001:db9::",
        "3ffe:ffff::",
        "3fff:1000::"
      ]
    );
    assert_class!(
      is_benchmark_ip_addr,
      [
        "198.18.0.0",
        "198.19.255.255",
        "2001:2::",
        "2001:2:0:ffff:ffff:ffff:ffff:ffff"
      ],
      [
        "198.17.255.255",
        "198.20.0.0",
        "2001:1:ffff::",
        "2001:2:1::",
        "2001:200::"
      ]
    );
    assert_class!(
      is_shared_ip_addr,
      ["100.64.0.0", "100.127.255.255"],
      ["100.63.255.255", "100.128.0.0", "::1"]
    );
    assert_class!(
      is_multicast_ip_addr,
      [
        "224.0.0.0",
        "239.255.255.255",
        "ff00::",
        "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"
      ],
      ["223.255.255.255", "240.0.0.0", "feff:ffff::"]
    );
    assert_class!(
      is_unspecified_ip_addr,
      ["0.0.0.0", "::"],
      ["0.0.0.1", "::1"]
    );
    assert_class!(
      is_broadcast_ip_addr,
      ["255.255.255.255"],
      ["255.255.255.254", "::"]
    );
  }

  #[test]
  fn benchmark_ipv6_classifier_matches_rfc5180() {
    for s in ["2001:2::", "2001:2:0:ffff:ffff:ffff:ffff:ffff"] {
      let ip = ipv6(s);
      assert!(is_benchmark_ipv6_addr(ip), "{s} should be benchmarking");
      assert!(crate::RFC5180.contains(&ip), "RFC5180 should contain {s}");
    }

    for s in ["2001:2:1::", "2001:200::"] {
      let ip = ipv6(s);
      assert!(
        !is_benchmark_ipv6_addr(ip),
        "{s} should not be benchmarking"
      );
      assert!(
        !crate::RFC5180.contains(&ip),
        "RFC5180 should not contain {s}"
      );
    }
  }
}