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Andrew Dunham 727acf96a6 net/netcheck: use DERP frames as a signal for home region liveness 
This uses the fact that we've received a frame from a given DERP region
within a certain time as a signal that the region is stil present (and
thus can still be a node's PreferredDERP / home region) even if we don't
get a STUN response from that region during a netcheck.

This should help avoid DERP flaps that occur due to losing STUN probes
while still having a valid and active TCP connection to the DERP server.

RELNOTE=Reduce home DERP flapping when there's still an active connection

Updates #8603

Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
Change-Id: If7da6312581e1d434d5c0811697319c621e187a0
 		2023-12-13 16:33:46 -05:00
..
art net/art: allow non-pointers as values 2023-08-17 10:43:18 -07:00
connstats net/connstats: exclude traffic with internal Tailscale service (#7904) 2023-04-17 14:24:29 -07:00
dns net/dns: use an additional registry setting to disable dynamic DNS updates for our interface on Windows 2023-12-04 09:10:35 -08:00
dnscache net/dnscache: remove completed TODO 2023-11-01 10:55:47 -07:00
dnsfallback net/dnsfallback: add singleflight to recursive resolver 2023-11-15 13:57:49 -05:00
flowtrack all: update copyright and license headers 2023-01-27 15:36:29 -08:00
interfaces net/interfaces: ensure we return valid 'self' IP in LikelyHomeRouterIP 2023-12-05 10:29:37 -05:00
memnet net/memnet: export the network name (#9111) 2023-08-28 11:43:51 -07:00
netaddr all: update copyright and license headers 2023-01-27 15:36:29 -08:00
netcheck net/netcheck: use DERP frames as a signal for home region liveness 2023-12-13 16:33:46 -05:00
neterror net/neterror, wgengine/magicsock: use UDP GSO and GRO on Linux (#7791) 2023-04-04 16:32:16 -07:00
netkernelconf client/tailscale,ipn/{ipnlocal,localapi}: check UDP GRO config (#10071) 2023-11-09 11:34:41 -08:00
netknob all: update copyright and license headers 2023-01-27 15:36:29 -08:00
netmon net/netmon: log when the gateway/self IP changes 2023-09-12 17:48:29 -04:00
netns net/{interfaces,netmon}: remove "interesting", EqualFiltered API 2023-08-29 11:57:30 -07:00
netstat net/{netns,netstat}: use new x/sys/cpu.IsBigEndian 2023-02-02 07:41:49 -08:00
netutil cmd/tailscale: refactor shared utility methods 2023-08-09 08:59:10 -07:00
packet net/packet: split off checksum munging into different pkg 2023-10-11 14:25:58 -07:00
ping net/ping: fix ICMP echo code field to 0 2023-09-15 17:08:39 -07:00
portmapper net/portmapper: be smarter about selecting a UPnP device 2023-12-13 16:32:29 -05:00
proxymux all: update copyright and license headers 2023-01-27 15:36:29 -08:00
routetable net/routetable: include unknown flags in the routetable doctor output 2023-02-10 15:54:31 -08:00
socks5 net/socks5: add password auth support 2023-03-05 14:08:34 -08:00
sockstats net/dns: retry forwarder requests over TCP 2023-09-25 16:42:07 -04:00
speedtest all: update copyright and license headers 2023-01-27 15:36:29 -08:00
stun wgengine/magicsock, types/nettype, etc: finish ReadFromUDPAddrPort netip migration 2023-04-15 13:40:15 -07:00
tcpinfo net/tcpinfo: add package to allow fetching TCP information 2023-06-27 21:59:43 -04:00
tlsdial cmd/tailscale/cli: make netcheck run even if machine lacks TLS certs 2023-08-23 21:11:04 -07:00
tsaddr types/netmap: remove NetworkMap.{Addresses,MachineStatus} 2023-09-18 17:08:11 +01:00
tsdial types/netmap: remove NetworkMap.{Addresses,MachineStatus} 2023-09-18 17:08:11 +01:00
tshttpproxy net/tshttpproxy: don't proxy through ourselves 2023-03-29 17:09:45 -04:00
tstun cmd/tailscaled,net/tstun: fix data race on start-up in TUN mode 2023-10-14 08:54:30 -07:00
wsconn net/wsconn: accept a remote addr string and plumb it through 2023-08-29 16:57:16 -07:00