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net/tsaddr: add new IP range for ephemeral nodes in Tailscale ULA (#1715)

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Signed-off-by: Naman Sood <mail@nsood.in>
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Naman Sood 2021-04-16 14:47:55 -04:00 committed by GitHub
parent b993d9802a
commit b85d80b37f
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1 changed files with 12 additions and 0 deletions
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12
net/tsaddr/tsaddr.go
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@ -35,6 +35,7 @@ var (
ulaRange oncePrefix ulaRange oncePrefix
tsUlaRange oncePrefix tsUlaRange oncePrefix
ula4To6Range oncePrefix ula4To6Range oncePrefix
ulaEph6Range oncePrefix
) )
// TailscaleServiceIP returns the listen address of services // TailscaleServiceIP returns the listen address of services
@ -72,6 +73,17 @@ func Tailscale4To6Range() netaddr.IPPrefix {
return ula4To6Range.v return ula4To6Range.v
} }
// TailscaleEphemeral6Range returns the subset of TailscaleULARange
// used for ephemeral IPv6-only Tailscale nodes.
func TailscaleEphemeral6Range() netaddr.IPPrefix {
// This IP range has no significance, beyond being a subset of
// TailscaleULARange. The bits from /48 to /104 were picked at
// random, with the only criterion being to not be the conflict
// with the Tailscale4To6Range above.
ulaEph6Range.Do(func() { mustPrefix(&ulaEph6Range.v, "fd7a:115c:a1e0:7234:6e44:306d:2100::/104") })
return ulaEph6Range.v
}
// Tailscale4To6Placeholder returns an IP address that can be used as // Tailscale4To6Placeholder returns an IP address that can be used as
// a source IP when one is required, but a netmap didn't provide // a source IP when one is required, but a netmap didn't provide
// any. This address never gets allocated by the 4-to-6 algorithm in // any. This address never gets allocated by the 4-to-6 algorithm in