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derp: add PeerPresentFlags bitmask to Watch messages

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Updates tailscale/corp#17816

Change-Id: Ib5baf6c981a6a4c279f8bbfef02048cfbfb3323b
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2024-06-22 09:17:51 -07:00
committed by Brad Fitzpatrick
parent d7a4f9d31c
commit 5ffb2668ef
4 changed files with 85 additions and 17 deletions
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26
derp/derp.go
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@@ -83,9 +83,16 @@ const (
// 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.
framePeerPresent = frameType(0x09) // 32B pub key of peer that's connected + optional 18B ip:port (16 byte IP + 2 byte BE uint16 port)
// framePeerPresent is like framePeerGone, but for other members of the DERP
// region when they're meshed up together.
//
// The message is at least 32 bytes (the public key of the peer that's
// connected). If there are at least 18 bytes remaining after that, it's the
// 16 byte IP + 2 byte BE uint16 port of the client. If there's another byte
// remaining after that, it's a PeerPresentFlags byte.
// While current servers send 41 bytes, old servers will send fewer, and newer
// servers might send more.
framePeerPresent = frameType(0x09)
// frameWatchConns is how one DERP node in a regional mesh
// subscribes to the others in the region.
@@ -128,6 +135,19 @@ const (
PeerGoneReasonNotHere = PeerGoneReasonType(0x01) // server doesn't know about this peer, unexpected
)
// PeerPresentFlags is an optional byte of bit flags sent after a framePeerPresent message.
//
// For a modern server, the value should always be non-zero. If the value is zero,
// that means the server doesn't support this field.
type PeerPresentFlags byte
// PeerPresentFlags bits.
const (
PeerPresentIsRegular = 1 << 0
PeerPresentIsMeshPeer = 1 << 1
PeerPresentIsProber = 1 << 2
)
var bin = binary.BigEndian
func writeUint32(bw *bufio.Writer, v uint32) error {