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net/dns/resolver, net/tsaddr: fix reverse lookups in 4to6 IP range

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Fixes #4439

Signed-off-by: Tom DNetto <tom@tailscale.com>
This commit is contained in:
Tom DNetto
2022-04-20 14:35:20 -07:00
committed by Tom
parent 8d6793fd70
commit df26c63793
3 changed files with 29 additions and 2 deletions
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12
net/tsaddr/tsaddr.go
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@@ -128,6 +128,18 @@ func Tailscale4To6(ipv4 netaddr.IP) netaddr.IP {
return netaddr.IPFrom16(ret)
}
// Tailscale6to4 returns the IPv4 address corresponding to the given
// tailscale IPv6 address within the 4To6 range. The IPv4 address
// and true are returned if the given address was in the correct range,
// false if not.
func Tailscale6to4(ipv6 netaddr.IP) (netaddr.IP, bool) {
if !ipv6.Is6() || !Tailscale4To6Range().Contains(ipv6) {
return netaddr.IP{}, false
}
v6 := ipv6.As16()
return netaddr.IPv4(100, v6[13], v6[14], v6[15]), true
}
func mustPrefix(v *netaddr.IPPrefix, prefix string) {
var err error
*v, err = netaddr.ParseIPPrefix(prefix)