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tailscale/wgengine
James Tucker 8d1249550a net/netcheck,wgengine/magicsock: add potential workaround for Palo Alto DIPP misbehavior
Palo Alto firewalls have a typically hard NAT, but also have a mode
called Persistent DIPP that is supposed to provide consistent port
mapping suitable for STUN resolution of public ports. Persistent DIPP
works initially on most Palo Alto firewalls, but some models/software
versions have a bug which this works around.

The bug symptom presents as follows:

- STUN sessions resolve a consistent public IP:port to start with
- Much later netchecks report the same IP:Port for a subset of
  sessions, most often the users active DERP, and/or the port related
  to sustained traffic.
- The broader set of DERPs in a full netcheck will now consistently
  observe a new IP:Port.
- After this point of observation, new inbound connections will only
  succeed to the new IP:Port observed, and existing/old sessions will
  only work to the old binding.

In this patch we now advertise the lowest latency global endpoint
discovered as we always have, but in addition any global endpoints that
are observed more than once in a single netcheck report. This should
provide viable endpoints for potential connection establishment across
a NAT with this behavior.

Updates tailscale/corp#19106

Signed-off-by: James Tucker <james@tailscale.com>
1 month ago
..
bench ipn/ipnlocal, all: plumb health trackers in tests 2 months ago
capture various: add golangci-lint, fix issues (#7905) 1 year ago
filter all: use Go 1.22 range-over-int 2 months ago
magicsock net/netcheck,wgengine/magicsock: add potential workaround for Palo Alto DIPP misbehavior 1 month ago
netlog wgengine: add exit destination logging enable for wgengine logger (#11952) 2 months ago
netstack xcode: allow ICMP ping relay on macOS + iOS platforms (#12048) 1 month ago
router wgengine/router: print Docker warning when stateful filtering is enabled 2 months ago
wgcfg tailcfg,all: add/plumb Node.IsJailed 2 months ago
wgint wgengine{,/wgint}: add wgint.Peer wrapper type, add to wgengine.Engine 4 months ago
wglog all: use Go 1.22 range-over-int 2 months ago
winnet all: update copyright and license headers 1 year ago
mem_ios.go all: update copyright and license headers 1 year ago
pendopen.go wgengine: make pendOpen time later, after dup check 4 months ago
userspace.go ipn/ipnlocal, all: plumb health trackers in tests 2 months ago
userspace_ext_test.go ipn/ipnlocal, all: plumb health trackers in tests 2 months ago
userspace_test.go ipn/ipnlocal, all: plumb health trackers in tests 2 months ago
watchdog.go ipn/ipnlocal,net/tstun,wgengine: create and plumb jailed packet filter 2 months ago
watchdog_js.go all: update copyright and license headers 1 year ago
watchdog_test.go ipn/ipnlocal, all: plumb health trackers in tests 2 months ago
wgengine.go ipn/ipnlocal,net/tstun,wgengine: create and plumb jailed packet filter 2 months ago