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wgengine/tsdns: replace connections when net link changes (macOS)

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When the network link changes, existing UDP sockets fail immediately
and permanently on macOS.

The forwarder set up a single UDP conn and never changed it.
As a result, any time there was a network link change,
all forwarded DNS queries failed.

To fix this, create a new connection when send requests
fail because of network unreachability.

This change is darwin-only, although extended it to other platforms
should be straightforward.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
This commit is contained in:
Josh Bleecher Snyder
2020-09-23 13:21:52 -07:00
committed by Josh Bleecher Snyder
parent 1fd10061fd
commit 6e8328cba5
4 changed files with 247 additions and 34 deletions
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2
cmd/tailscale/depaware.txt
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@ -51,7 +51,7 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
tailscale.com/ipn/ipnstate from tailscale.com/cmd/tailscale/cli+
tailscale.com/ipn/policy from tailscale.com/ipn
tailscale.com/log/logheap from tailscale.com/control/controlclient
tailscale.com/logtail/backoff from tailscale.com/control/controlclient
tailscale.com/logtail/backoff from tailscale.com/control/controlclient+
tailscale.com/metrics from tailscale.com/derp
tailscale.com/net/dnscache from tailscale.com/cmd/tailscale/cli+
tailscale.com/net/interfaces from tailscale.com/cmd/tailscale/cli+