[PATCH 1 of 7] QUIC: fixed close timer processing with early data

[Maxim Dounin]

# HG changeset patch
# User Vladimir Khomutov <vl at wbsrv.ru>
# Date 1712731090 -10800
#      Wed Apr 10 09:38:10 2024 +0300
# Node ID 9e9988d46171cfe26fe0f9d24a51eb38926adbb8
# Parent  4a0cd107c0f1d56cd455df39c37eb0fffc085760
QUIC: fixed close timer processing with early data.

The ngx_quic_run() function uses qc->close timer to limit the handshake
duration.  Normally it is removed by ngx_quic_do_init_streams() which is
called once when we are done with initial SSL processing.

The problem happens when the client sends early data and streams are
initialized in the ngx_quic_run() -> ngx_quic_handle_datagram() call.
The order of set/remove timer calls is now reversed; the close timer is
set up and the timer fires when assigned, starting the unexpected connection
close process.

The fix is to skip setting the timer if streams were initialized during
handling of the initial datagram.  The idle timer for quic is set anyway,
and stream-related timeouts are managed by application layer.

diff --git a/src/event/quic/ngx_event_quic.c b/src/event/quic/ngx_event_quic.c
--- a/src/event/quic/ngx_event_quic.c
+++ b/src/event/quic/ngx_event_quic.c
@@ -211,7 +211,10 @@ ngx_quic_run(ngx_connection_t *c, ngx_qu
     qc = ngx_quic_get_connection(c);
 
     ngx_add_timer(c->read, qc->tp.max_idle_timeout);
-    ngx_add_timer(&qc->close, qc->conf->handshake_timeout);
+
+    if (!qc->streams.initialized) {
+        ngx_add_timer(&qc->close, qc->conf->handshake_timeout);
+    }
 
     ngx_quic_connstate_dbg(c);