6 Commits (main)

Author	SHA1	Message	Date
Brad Fitzpatrick	f227083539	derp: add some guardrails for derpReason metrics getting out of sync ... The derp metrics got out of sync in 74eb99aed1 (2023-03). They were fixed in 0380cbc90d (2024-05). This adds some further guardrails (atop the previous fix) to make sure they don't get out of sync again. Updates #12288 Change-Id: I809061a81f8ff92f45054d0253bc13871fc71634 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	6 months ago
valscale	74eb99aed1	derp, derphttp, magicsock: send new unknown peer frame when destination is unknown (#7552) ... * wgengine/magicsock: add envknob to send CallMeMaybe to non-existent peer For testing older client version responses to the PeerGone packet format change. Updates #4326 Signed-off-by: Val <valerie@tailscale.com> * derp: remove dead sclient struct member replaceLimiter Leftover from an previous solution to the duplicate client problem. Updates #2751 Signed-off-by: Val <valerie@tailscale.com> * derp, derp/derphttp, wgengine/magicsock: add new PeerGone message type Not Here Extend the PeerGone message type by adding a reason byte. Send a PeerGone "Not Here" message when an endpoint sends a disco message to a peer that this server has no record of. Fixes #4326 Signed-off-by: Val <valerie@tailscale.com> --------- Signed-off-by: Val <valerie@tailscale.com>	2 years ago
Will Norris	71029cea2d	all: update copyright and license headers ... This updates all source files to use a new standard header for copyright and license declaration. Notably, copyright no longer includes a date, and we now use the standard SPDX-License-Identifier header. This commit was done almost entirely mechanically with perl, and then some minimal manual fixes. Updates #6865 Signed-off-by: Will Norris <will@tailscale.com>	2 years ago
Brad Fitzpatrick	73280595a8	derp: accept dup clients without closing prior's connection ... A public key should only have max one connection to a given DERP node (or really: one connection to a node in a region). But if people clone their machine keys (e.g. clone their VM, Raspbery Pi SD card, etc), then we can get into a situation where a public key is connected multiple times. Originally, the DERP server handled this by just kicking out a prior connections whenever a new one came. But this led to reconnect fights where 2+ nodes were in hard loops trying to reconnect and kicking out their peer. Then a909d37a59 tried to add rate limiting to how often that dup-kicking can happen, but empirically it just doesn't work and ~leaks a bunch of goroutines and TCP connections, tying them up for hour+ while more and more accumulate and waste memory. Mostly because we were doing a time.Sleep forever while not reading from their TCP connections. Instead, just accept multiple connections per public key but track which is the most recent. And if two both are writing back & forth, then optionally disable them both. That last part is only enabled in tests for now. The current default policy is just last-sender-wins while we gather the next round of stats. Updates #2751 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Josh Bleecher Snyder	0ec9040c5e	scripts: remove special case for _strings.go files in check license headers ... And add a license header for derp/dropreason_string.go to make it happy. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	3 years ago
David Anderson	36492ace9d	derp: add counters to track the type of dropped packets. ... Signed-off-by: David Anderson <danderson@tailscale.com>	3 years ago