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Improve IP scope classification

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This commit is contained in:
Daniel
2022-04-13 11:05:39 +02:00
parent 014eb95eac
commit fdafc1ea5e
1 changed files with 24 additions and 10 deletions
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34
network/netutils/ip.go
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@@ -29,29 +29,43 @@ func GetIPScope(ip net.IP) IPScope { //nolint:gocognit
// IPv4
switch {
case ip4[0] == 127:
// 127.0.0.0/8
// 127.0.0.0/8 (RFC1918)
return HostLocal
case ip4[0] == 169 && ip4[1] == 254:
// 169.254.0.0/16
// 169.254.0.0/16 (RFC3927)
return LinkLocal
case ip4[0] == 10:
// 10.0.0.0/8
// 10.0.0.0/8 (RFC1918)
return SiteLocal
case ip4[0] == 172 && ip4[1]&0xf0 == 16:
// 172.16.0.0/12
case ip4[0] == 100 && ip4[1]&0b11000000 == 64:
// 100.64.0.0/10 (RFC6598)
return SiteLocal
case ip4[0] == 172 && ip4[1]&0b11110000 == 16:
// 172.16.0.0/12 (RFC1918)
return SiteLocal
case ip4[0] == 192 && ip4[1] == 0 && ip4[2] == 2:
// 192.0.2.0/24 (TEST-NET-1, RFC5737)
return Invalid
case ip4[0] == 192 && ip4[1] == 168:
// 192.168.0.0/16
// 192.168.0.0/16 (RFC1918)
return SiteLocal
case ip4[0] == 198 && ip4[1] == 51 && ip4[2] == 100:
// 198.51.100.0/24 (TEST-NET-2, RFC5737)
return Invalid
case ip4[0] == 203 && ip4[1] == 0 && ip4[2] == 113:
// 203.0.113.0/24 (TEST-NET-3, RFC5737)
return Invalid
case ip4[0] == 224:
// 224.0.0.0/8
// 224.0.0.0/8 (RFC5771)
return LocalMulticast
case ip4[0] == 233 && ip4[1] == 252 && ip4[2] == 0:
// 233.252.0.0/24 (MCAST-TEST-NET; RFC5771, RFC6676)
return Invalid
case ip4[0] >= 225 && ip4[0] <= 238:
// 225.0.0.0/8 - 238.0.0.0/8
// 225.0.0.0/8 - 238.0.0.0/8 (RFC5771)
return GlobalMulticast
case ip4[0] == 239:
// 239.0.0.0/8
// RFC2365 - https://tools.ietf.org/html/rfc2365
// 239.0.0.0/8 (RFC2365)
return LocalMulticast
case ip4[0] == 255 && ip4[1] == 255 && ip4[2] == 255 && ip4[3] == 255:
// 255.255.255.255/32