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ipnlocal, net/{dns,tsaddr,tstun}, wgengine: support MagicDNS on IPv6

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Fixes #3660

RELNOTE=MagicDNS now works over IPv6 when CGNAT IPv4 is disabled.

Change-Id: I001e983df5feeb65289abe5012dedd177b841b45
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2022-01-04 13:33:08 -08:00
committed by Brad Fitzpatrick
parent e2d9c99e5b
commit 506c727e30
9 changed files with 105 additions and 35 deletions
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14
net/tsaddr/tsaddr.go
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@@ -36,14 +36,26 @@ var (
tsUlaRange oncePrefix
ula4To6Range oncePrefix
ulaEph6Range oncePrefix
serviceIPv6 oncePrefix
)
// TailscaleServiceIP returns the listen address of services
// TailscaleServiceIP returns the IPv4 listen address of services
// provided by Tailscale itself such as the MagicDNS proxy.
//
// For IPv6, use TailscaleServiceIPv6.
func TailscaleServiceIP() netaddr.IP {
return netaddr.IPv4(100, 100, 100, 100) // "100.100.100.100" for those grepping
}
// TailscaleServiceIPv6 returns the IPv6 listen address of the services
// provided by Tailscale itself such as the MagicDNS proxy.
//
// For IPv4, use TailscaleServiceIP.
func TailscaleServiceIPv6() netaddr.IP {
serviceIPv6.Do(func() { mustPrefix(&serviceIPv6.v, "fd7a:115c:a1e0::53/128") })
return serviceIPv6.v.IP()
}
// IsTailscaleIP reports whether ip is an IP address in a range that
// Tailscale assigns from.
func IsTailscaleIP(ip netaddr.IP) bool {