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net/tsaddr: IsUla() for IPv6 Unique Local Address

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Signed-off-by: Denton Gentry <dgentry@tailscale.com>
This commit is contained in:
Denton Gentry 2021-03-29 18:28:57 -07:00 committed by Denton Gentry
parent 36a85e1760
commit ecf310be3c
2 changed files with 30 additions and 2 deletions
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10
net/tsaddr/tsaddr.go
View File

@ -33,6 +33,7 @@ func CGNATRange() netaddr.IPPrefix {
var (
cgnatRange oncePrefix
ulaRange oncePrefix
tsUlaRange oncePrefix
ula4To6Range oncePrefix
)
@ -57,8 +58,8 @@ func IsTailscaleIP(ip netaddr.IP) bool {
// TailscaleULARange returns the IPv6 Unique Local Address range that
// is the superset range that Tailscale assigns out of.
func TailscaleULARange() netaddr.IPPrefix {
ulaRange.Do(func() { mustPrefix(&ulaRange.v, "fd7a:115c:a1e0::/48") })
return ulaRange.v
tsUlaRange.Do(func() { mustPrefix(&tsUlaRange.v, "fd7a:115c:a1e0::/48") })
return tsUlaRange.v
}
// Tailscale4To6Range returns the subset of TailscaleULARange used for
@ -95,6 +96,11 @@ func Tailscale4To6(ipv4 netaddr.IP) netaddr.IP {
return netaddr.IPFrom16(ret)
}
func IsULA(ip netaddr.IP) bool {
ulaRange.Do(func() { mustPrefix(&ulaRange.v, "fc00::/7") })
return ulaRange.v.Contains(ip)
}
func mustPrefix(v *netaddr.IPPrefix, prefix string) {
var err error
*v, err = netaddr.ParseIPPrefix(prefix)

22
net/tsaddr/tsaddr_test.go
View File

@ -42,3 +42,25 @@ func TestCGNATRange(t *testing.T) {
t.Errorf("got %q; want %q", got, want)
}
}
func TestIsUla(t *testing.T) {
tests := []struct {
name string
ip string
want bool
}{
{"first ULA", "fc00::1", true},
{"not ULA", "fb00::1", false},
{"Tailscale", "fd7a:115c:a1e0::1", true},
{"Cloud Run", "fddf:3978:feb1:d745::1", true},
{"zeros", "0000:0000:0000:0000:0000:0000:0000:0000", false},
{"Link Local", "fe80::1", false},
{"Global", "2602::1", false},
}
for _, test := range tests {
if got := IsULA(netaddr.MustParseIP(test.ip)); got != test.want {
t.Errorf("IsULA(%s) = %v, want %v", test.name, got, test.want)
}
}
}