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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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2
net/dns/resolver/tsdns.go
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@@ -377,7 +377,7 @@ func (r *Resolver) HandleExitNodeDNSQuery(ctx context.Context, q []byte, from ne
// TODO: more than 1 resolver from /etc/resolv.conf?
var resolvers []resolverAndDelay
if nameserver == tsaddr.TailscaleServiceIP() {
if nameserver == tsaddr.TailscaleServiceIP() || nameserver == tsaddr.TailscaleServiceIPv6() {
// If resolv.conf says 100.100.100.100, it's coming right back to us anyway
// so avoid the loop through the kernel and just do what we
// would've done anyway. By not passing any resolvers, the forwarder