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net/tsaddr: extract IsTailscaleIPv4 from IsTailscaleIP (#14169)

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Extracts tsaddr.IsTailscaleIPv4 out of tsaddr.IsTailscaleIP.

This will allow for checking valid Tailscale assigned IPv4 addresses
without checking IPv6 addresses.

Updates #14168
Updates tailscale/corp#24620

Signed-off-by: James Scott <jim@tailscale.com>
This commit is contained in:
James Scott
2024-11-20 12:28:25 -08:00
committed by GitHub
parent ebeb5da202
commit ebaf33a80c
2 changed files with 76 additions and 2 deletions
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10
net/tsaddr/tsaddr.go
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@@ -66,15 +66,21 @@ const (
TailscaleServiceIPv6String = "fd7a:115c:a1e0::53"
)
// IsTailscaleIP reports whether ip is an IP address in a range that
// IsTailscaleIP reports whether IP is an IP address in a range that
// Tailscale assigns from.
func IsTailscaleIP(ip netip.Addr) bool {
if ip.Is4() {
return CGNATRange().Contains(ip) && !ChromeOSVMRange().Contains(ip)
return IsTailscaleIPv4(ip)
}
return TailscaleULARange().Contains(ip)
}
// IsTailscaleIPv4 reports whether an IPv4 IP is an IP address that
// Tailscale assigns from.
func IsTailscaleIPv4(ip netip.Addr) bool {
return CGNATRange().Contains(ip) && !ChromeOSVMRange().Contains(ip)
}
// TailscaleULARange returns the IPv6 Unique Local Address range that
// is the superset range that Tailscale assigns out of.
func TailscaleULARange() netip.Prefix {