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Jonathan Nobels 2b7f8b6be7 net/netmon: remove ChangeDelta.Major and start the TODOs ... updates tailscale/corp#33891 We've had some TODO's in netmon for ages related to asking more pointed questions of ChangeDelta. We're also seeing a lot of ChangeDelta's being flagged as "Major" when they are not interesting, triggering rebinds in wgengine that are not needed. This removes the "Major" flag and replaces it with a set of precomputed values that hint at what the ChangeDelta means. The dependencies are cleaned up a bit, notably removing dependency on netmon itself for calculating what is interesting, and what is not. This includes letting individual platforms set a bespoke global "IsInterestingInterface" function. This was only used on Darwin. RebindRequired roughly flows from how "Major" was historically calculated but includes some additional checks for various uninteresting events such as changes in interface addresses that shouldn't trigger a rebind to minimize thrashing. The individual values that we roll into RebindRequired are also exposed so that components consuming netmap.ChangeDelta can ask more targeted questions. Signed-off-by: Jonathan Nobels <jonathan@tailscale.com> wgengine/userspace: skip rebind and restun if all of our interfaces are down updates tailscale/corp#33891 Skip rebind and restun if we have called SetNetworkUp with false. Neither cares about this state and it's just flappy to try to reStun and rebind if there are no usable interfaces available. Signed-off-by: Jonathan Nobels <jonathan@tailscale.com> Add viability flag and fix bug in state		1 day ago
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bench	types/netmap: remove PrivateKey from NetworkMap	3 weeks ago
filter	wgengine/filter: add check for unknown proto	11 months ago
magicsock	net/tstun: add TSMPDiscoAdvertisement to TSMPPing (#17995)	2 weeks ago
netlog	wgengine/netlog: strip dot suffix from node name (#17954)	3 weeks ago
netstack	all: rename variables with lowercase-l/uppercase-I	3 weeks ago
router	all: rename variables with lowercase-l/uppercase-I	3 weeks ago
wgcfg	types/netmap: remove PrivateKey from NetworkMap	3 weeks ago
wgint	wgengine{,/wgint}: add wgint.Peer wrapper type, add to wgengine.Engine	2 years ago
wglog	all: use Go 1.22 range-over-int	2 years ago
winnet	all: add test for package comments, fix, add comments as needed	1 year ago
mem_ios.go	all: update copyright and license headers	3 years ago
pendopen.go	wgengine: stop importing flowtrack when unused	2 months ago
pendopen_omit.go	wgengine: stop importing flowtrack when unused	2 months ago
userspace.go	net/netmon: remove ChangeDelta.Major and start the TODOs	1 day ago
userspace_ext_test.go	health,ipn/ipnlocal: introduce eventbus in heath.Tracker (#17085)	3 months ago
userspace_test.go	net/tstun: add TSMPDiscoAdvertisement to TSMPPing (#17995)	2 weeks ago
watchdog.go	ipn/ipnlocal: remove all the weird locking (LockedOnEntry, UnlockEarly, etc)	3 weeks ago
watchdog_omit.go	ipn/ipnlocal, engine: avoid runtime/pprof with two usages of ts_omit_debug	2 months ago
watchdog_test.go	health,ipn/ipnlocal: introduce eventbus in heath.Tracker (#17085)	3 months ago
wgengine.go	ipn/ipnlocal: remove all the weird locking (LockedOnEntry, UnlockEarly, etc)	3 weeks ago