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Brad Fitzpatrick fe91043315 wgengine/magicsock, net/netcheck, feature/featuretags: add udptransport and nattraversal features

Contining the trend of making everything be optional that could
possibly be optional, this makes the magicsock UDP underlay transport
be optional. (mostly replacing a bunch of GOOS != "js" checks in the process)

Omitting udptransport (ts_omit_udptransport) makes magicsock DERP-only: no
UDP sockets, no advertised endpoints, and netcheck measures DERP latency
over HTTPS. Omitting only nattraversal keeps disco ping/pong to peers'
advertised endpoints but drops STUN, call-me-maybe, the peer relay client,
the endpoint tracker, and UDP lifetime probing.

Both are plain linker dead-code elimination via buildfeatures
constants. (as oppposed to moving the code all over into feature
packages and indirecting through hooks) The minimal linux/amd64
tailscaled shrinks by 258 KB without nattraversal and 561 KB without
both.

Updates #12614

Change-Id: Ife10804b48a168d9481e4321c18ed8fc85fa71f1
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

2026-09-29 06:09:17 -07:00

cli

wgengine/magicsock, net/netcheck, feature/featuretags: add udptransport and nattraversal features

2026-09-29 06:09:17 -07:00

jsonoutput

cmd/tailscale/jsonoutput: expand on package documentation

2026-07-30 16:23:09 -04:00

tsdnsjsonv0

cmd/tailscale/tsdnsjsonv0: extract a new package for tailscale dns --json (#20017 )

2026-07-27 13:59:29 -07:00

tslockjsonv1

cmd/tailscale/jsonoutput: expand on package documentation