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net: add IP.IsPrivate #42793

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21 changes: 21 additions & 0 deletions src/net/ip.go
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Original file line number Diff line number Diff line change
Expand Up @@ -128,6 +128,27 @@ func (ip IP) IsLoopback() bool {
return ip.Equal(IPv6loopback)
}

// IsPrivate reports whether ip is a private address, according to
// RFC 1918 (IPv4 addresses) and RFC 4193 (IPv6 addresses).
func (ip IP) IsPrivate() bool {
if ip4 := ip.To4(); ip4 != nil {
// Following RFC 4193, Section 3. Local IPv6 Unicast Addresses which says:
// The Internet Assigned Numbers Authority (IANA) has reserved the
// following three blocks of the IPv4 address space for private internets:
// 10.0.0.0 - 10.255.255.255 (10/8 prefix)
// 172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
// 192.168.0.0 - 192.168.255.255 (192.168/16 prefix)
return ip4[0] == 10 ||
(ip4[0] == 172 && ip4[1]&0xf0 == 16) ||
(ip4[0] == 192 && ip4[1] == 168)
}
// Following RFC 4193, Section 3. Private Address Space which says:
// The Internet Assigned Numbers Authority (IANA) has reserved the
// following block of the IPv6 address space for local internets:
// FC00:: - FDFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF (FC00::/7 prefix)
return len(ip) == IPv6len && ip[0]&0xfe == 0xfc
}

// IsMulticast reports whether ip is a multicast address.
func (ip IP) IsMulticast() bool {
if ip4 := ip.To4(); ip4 != nil {
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22 changes: 22 additions & 0 deletions src/net/ip_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -691,6 +691,28 @@ var ipAddrScopeTests = []struct {
{IP.IsGlobalUnicast, IP{0xfe, 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, false},
{IP.IsGlobalUnicast, IP{0xff, 0x05, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, false},
{IP.IsGlobalUnicast, nil, false},
{IP.IsPrivate, nil, false},
{IP.IsPrivate, IPv4(1, 1, 1, 1), false},
{IP.IsPrivate, IPv4(9, 255, 255, 255), false},
{IP.IsPrivate, IPv4(10, 0, 0, 0), true},
{IP.IsPrivate, IPv4(10, 255, 255, 255), true},
{IP.IsPrivate, IPv4(11, 0, 0, 0), false},
{IP.IsPrivate, IPv4(172, 15, 255, 255), false},
{IP.IsPrivate, IPv4(172, 16, 0, 0), true},
{IP.IsPrivate, IPv4(172, 16, 255, 255), true},
{IP.IsPrivate, IPv4(172, 23, 18, 255), true},
{IP.IsPrivate, IPv4(172, 31, 255, 255), true},
{IP.IsPrivate, IPv4(172, 31, 0, 0), true},
{IP.IsPrivate, IPv4(172, 32, 0, 0), false},
{IP.IsPrivate, IPv4(192, 167, 255, 255), false},
{IP.IsPrivate, IPv4(192, 168, 0, 0), true},
{IP.IsPrivate, IPv4(192, 168, 255, 255), true},
{IP.IsPrivate, IPv4(192, 169, 0, 0), false},
{IP.IsPrivate, IP{0xfb, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, false},
{IP.IsPrivate, IP{0xfc, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, true},
{IP.IsPrivate, IP{0xfc, 0xff, 0x12, 0, 0, 0, 0, 0x44, 0, 0, 0, 0, 0, 0, 0, 0}, true},
{IP.IsPrivate, IP{0xfd, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, true},
{IP.IsPrivate, IP{0xfe, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, false},
}

func name(f interface{}) string {
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