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derp, derphttp, magicsock: send new unknown peer frame when destination is unknown (#7552)

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* 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>
This commit is contained in:
valscale
2023-03-24 19:11:48 -07:00
committed by GitHub
parent 09d0b632d4
commit 74eb99aed1
12 changed files with 211 additions and 67 deletions
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6
derp/dropreason_string.go
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@@ -13,16 +13,16 @@ func _() {
var x [1]struct{}
_ = x[dropReasonUnknownDest-0]
_ = x[dropReasonUnknownDestOnFwd-1]
_ = x[dropReasonGone-2]
_ = x[dropReasonGoneDisconnected-2]
_ = x[dropReasonQueueHead-3]
_ = x[dropReasonQueueTail-4]
_ = x[dropReasonWriteError-5]
_ = x[dropReasonDupClient-6]
}
const _dropReason_name = "UnknownDestUnknownDestOnFwdGoneQueueHeadQueueTailWriteErrorDupClient"
const _dropReason_name = "UnknownDestUnknownDestOnFwdGoneDisconnectedQueueHeadQueueTailWriteErrorDupClient"
var _dropReason_index = [...]uint8{0, 11, 27, 31, 40, 49, 59, 68}
var _dropReason_index = [...]uint8{0, 11, 27, 43, 52, 61, 71, 80}
func (i dropReason) String() string {
if i < 0 || i >= dropReason(len(_dropReason_index)-1) {