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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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16
derp/derp.go
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@@ -77,8 +77,11 @@ const (
// a previous sender is no longer connected. That is, if A
// sent to B, and then if A disconnects, the server sends
// framePeerGone to B so B can forget that a reverse path
// exists on that connection to get back to A.
framePeerGone = frameType(0x08) // 32B pub key of peer that's gone
// exists on that connection to get back to A. It is also sent
// if A tries to send a CallMeMaybe to B and the server has no
// record of B (which currently would only happen if there was
// a bug).
framePeerGone = frameType(0x08) // 32B pub key of peer that's gone + 1 byte reason
// framePeerPresent is like framePeerGone, but for other
// members of the DERP region when they're meshed up together.
@@ -116,6 +119,15 @@ const (
frameRestarting = frameType(0x15)
)
// PeerGoneReasonType is a one byte reason code explaining why a
// server does not have a path to the requested destination.
type PeerGoneReasonType byte
const (
PeerGoneReasonDisconnected = PeerGoneReasonType(0x00) // peer disconnected from this server
PeerGoneReasonNotHere = PeerGoneReasonType(0x01) // server doesn't know about this peer, unexpected
)
var bin = binary.BigEndian
func writeUint32(bw *bufio.Writer, v uint32) error {