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TUN-8667: Add datagram v3 session manager

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New session manager leverages similar functionality that was previously
provided with datagram v2, with the distinct difference that the sessions
are registered via QUIC Datagrams and unregistered via timeouts only; the
sessions will no longer attempt to unregister sessions remotely with the
edge service.

The Session Manager is shared across all QUIC connections that cloudflared
uses to connect to the edge (typically 4). This will help cloudflared be
able to monitor all sessions across the connections and help correlate
in the future if sessions migrate across connections.

The UDP payload size is still limited to 1280 bytes across all OS's. Any
UDP packet that provides a payload size of greater than 1280 will cause
cloudflared to report (as it currently does) a log error and drop the packet.

Closes TUN-8667
This commit is contained in:
Devin Carr
2024-10-31 14:05:15 -07:00
parent 599ba52750
commit 6a6c890700
11 changed files with 743 additions and 7 deletions
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10
quic/v3/datagram.go
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@@ -24,7 +24,7 @@ const (
datagramTypeLen = 1
// 1280 is the default datagram packet length used before MTU discovery: https://github.com/quic-go/quic-go/blob/v0.45.0/internal/protocol/params.go#L12
maxDatagramLen = 1280
maxDatagramPayloadLen = 1280
)
func parseDatagramType(data []byte) (DatagramType, error) {
@@ -100,10 +100,10 @@ func (s *UDPSessionRegistrationDatagram) MarshalBinary() (data []byte, err error
}
var maxPayloadLen int
if ipv6 {
maxPayloadLen = maxDatagramLen - sessionRegistrationIPv6DatagramHeaderLen
maxPayloadLen = maxDatagramPayloadLen + sessionRegistrationIPv6DatagramHeaderLen
flags |= sessionRegistrationFlagsIPMask
} else {
maxPayloadLen = maxDatagramLen - sessionRegistrationIPv4DatagramHeaderLen
maxPayloadLen = maxDatagramPayloadLen + sessionRegistrationIPv4DatagramHeaderLen
}
// Make sure that the payload being bundled can actually fit in the payload destination
if len(s.Payload) > maxPayloadLen {
@@ -195,7 +195,7 @@ const (
datagramPayloadHeaderLen = datagramTypeLen + datagramRequestIdLen
// The maximum size that a proxied UDP payload can be in a [UDPSessionPayloadDatagram]
maxPayloadPlusHeaderLen = maxDatagramLen - datagramPayloadHeaderLen
maxPayloadPlusHeaderLen = maxDatagramPayloadLen + datagramPayloadHeaderLen
)
// The datagram structure for UDPSessionPayloadDatagram is:
@@ -270,7 +270,7 @@ const (
datagramSessionRegistrationResponseLen = datagramTypeLen + datagramRespTypeLen + datagramRequestIdLen + datagramRespErrMsgLen
// The maximum size that an error message can be in a [UDPSessionRegistrationResponseDatagram].
maxResponseErrorMessageLen = maxDatagramLen - datagramSessionRegistrationResponseLen
maxResponseErrorMessageLen = maxDatagramPayloadLen - datagramSessionRegistrationResponseLen
)
// SessionRegistrationResp represents all of the responses that a UDP session registration response