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Josh Bleecher Snyder 99705aa6b7 net/tstun: split TUN events channel into up/down and MTU ... We had a long-standing bug in which our TUN events channel was being received from simultaneously in two places. The first is wireguard-go. At wgengine/userspace.go:366, we pass e.tundev to wireguard-go, which starts a goroutine (RoutineTUNEventReader) that receives from that channel and uses events to adjust the MTU and bring the device up/down. At wgengine/userspace.go:374, we launch a goroutine that receives from e.tundev, logs MTU changes, and triggers state updates when up/down changes occur. Events were getting delivered haphazardly between the two of them. We don't really want wireguard-go to receive the up/down events; we control the state of the device explicitly by calling device.Up. And the userspace.go loop MTU logging duplicates logging that wireguard-go does when it received MTU updates. So this change splits the single TUN events channel into up/down and other (aka MTU), and sends them to the parties that ought to receive them. I'm actually a bit surprised that this hasn't caused more visible trouble. If a down event went to wireguard-go but the subsequent up event went to userspace.go, we could end up with the wireguard-go device disappearing. I believe that this may also (somewhat accidentally) be a fix for #1790. Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>		3 years ago
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dns	net/dns: work around WSL DNS implementation flaws.	3 years ago
dnscache	control/controlclient, net/{dnscache,dnsfallback}: add DNS fallback mechanism	3 years ago
dnsfallback	net/dnsfallback: fix infinite loop and limit number of candidates	3 years ago
flowtrack	net/packet, wgengine/filter: support SCTP	3 years ago
interfaces	net/interfaces: work around race fetching routing table	3 years ago
netcheck	net/netcheck: add a few more STUN retries for prior DERP home	3 years ago
netns	net/{interfaces,netns}: add some new tests, missed from prior commit	3 years ago
netstat	net/netstat: remove a bit more unsafe	4 years ago
nettest	net/nettest: make nettest.NewConn pass x/net/nettest.TestConn.	3 years ago
packet	net/{packet,tstun}: send peerapi port in TSMP pongs	3 years ago
portmapper	net/portmapper: silently handle PCP NOT_AUTHORIZED responses.	3 years ago
socks5	cmd/tailscaled, wgengine: remove --fake, replace with netstack	3 years ago
stun	stun fuzzer: Small fix	3 years ago
tlsdial	net/tlsdial, derp/derphttp: finish DERPNode.CertName validation	4 years ago
tsaddr	net/tsaddr: expand ephemeral nodes range to /64	3 years ago
tshttpproxy	net/tshttpproxy: call winhttp calls from a fixed OS thread	3 years ago
tstun	net/tstun: split TUN events channel into up/down and MTU	3 years ago