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net/netns, net/dns/resolver, etc: make netmon required in most places

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The goal is to move more network state accessors to netmon.Monitor
where they can be cheaper/cached. But first (this change and others)
we need to make sure the one netmon.Monitor is plumbed everywhere.

Some notable bits:

* tsdial.NewDialer is added, taking a now-required netmon

* because a tsdial.Dialer always has a netmon, anything taking both
  a Dialer and a NetMon is now redundant; take only the Dialer and
  get the NetMon from that if/when needed.

* netmon.NewStatic is added, primarily for tests

Updates tailscale/corp#10910
Updates tailscale/corp#18960
Updates #7967
Updates #3299

Change-Id: I877f9cb87618c4eb037cee098241d18da9c01691
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2024-04-26 22:06:20 -07:00
committed by Brad Fitzpatrick
parent 4f73a26ea5
commit 3672f29a4e
34 changed files with 228 additions and 86 deletions
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4
cmd/tailscaled/tailscaled.go
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@@ -393,8 +393,8 @@ func run() (err error) {
// Always clean up, even if we're going to run the server. This covers cases
// such as when a system was rebooted without shutting down, or tailscaled
// crashed, and would for example restore system DNS configuration.
dns.CleanUp(logf, args.tunname)
router.CleanUp(logf, args.tunname)
dns.CleanUp(logf, netMon, args.tunname)
router.CleanUp(logf, netMon, args.tunname)
// If the cleanUp flag was passed, then exit.
if args.cleanUp {
return nil