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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
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@@ -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)