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Joe Tsai 81fd259133 wgengine/magicsock: gather physical-layer statistics (#5925) ... There is utility in logging traffic statistics that occurs at the physical layer. That is, in order to send packets virtually to a particular tailscale IP address, what physical endpoints did we need to communicate with? This functionality logs IP addresses identical to what had always been logged in magicsock prior to #5823, so there is no increase in PII being logged. ExtractStatistics returns a mapping of connections to counts. The source is always a Tailscale IP address (without port), while the destination is some endpoint reachable on WAN or LAN. As a special case, traffic routed through DERP will use 127.3.3.40 as the destination address with the port being the DERP region. This entire feature is only enabled if data-plane audit logging is enabled on the tailnet (by default it is disabled). Example of type of information logged: ------------------------------------ Tx[P/s] Tx[B/s] Rx[P/s] Rx[B/s] PhysicalTraffic: 25.80 3.39Ki 38.80 5.57Ki 100.1.2.3 -> 143.11.22.33:41641 15.40 2.00Ki 23.20 3.37Ki 100.4.5.6 -> 192.168.0.100:41641 10.20 1.38Ki 15.60 2.20Ki 100.7.8.9 -> 127.3.3.40:2 0.20 6.40 0.00 0.00 Signed-off-by: Joe Tsai <joetsai@digital-static.net>		4 years ago
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debughttp.go	wgengine/magicsock: fix panic in http debug server	4 years ago
debugknobs.go	wgengine/magicsock: add client flag and envknob to disable heartbeat (#5638)	4 years ago
debugknobs_stubs.go	wgengine/magicsock: add client flag and envknob to disable heartbeat (#5638)	4 years ago
discopingpurpose_string.go	wgengine/magicsock: make discoPingPurpose a stringer	6 years ago
magicsock.go	wgengine/magicsock: gather physical-layer statistics (#5925)	4 years ago
magicsock_default.go	wgengine/magicsock: set UDP socket buffer sizes to 7MB	4 years ago
magicsock_linux.go	wgengine/magicsock: set UDP socket buffer sizes to 7MB	4 years ago
magicsock_test.go	wgengine/magicsock: gather physical-layer statistics (#5925)	4 years ago
magicsock_unix_test.go	wgengine/magicsock: set UDP socket buffer sizes to 7MB	4 years ago
pathfinder.go	wgengine/magicsock: set up pathfinder (#5994)	4 years ago