# HG changeset patch
# User Sergey Kandaurov <pluknet@nginx.com>
# Date 1601550622 -3600
# Node ID 9588a2782c62225632d85488303e3e56f8294ea0
# Parent  0e12c4aca3ab1304ea88841b1d82786c33ef7d48
QUIC: speeding up handshake completion.

As per quic-recovery draft, section-6.2.3: resend CRYPTO frames
when receiving an Initial packet containing duplicate CRYPTO data.

diff --git a/src/event/ngx_event_quic.c b/src/event/ngx_event_quic.c
--- a/src/event/ngx_event_quic.c
+++ b/src/event/ngx_event_quic.c
@@ -2661,7 +2661,7 @@ ngx_quic_handle_ordered_frame(ngx_connec
             == NGX_DONE)
         {
             /* old/duplicate data range */
-            return NGX_OK;
+            return handler == ngx_quic_crypto_input ? NGX_DECLINED : NGX_OK;
         }
 
         /* intersecting data range, frame modified */
@@ -2844,6 +2844,7 @@ ngx_quic_handle_crypto_frame(ngx_connect
     ngx_quic_frame_t *frame)
 {
     uint64_t                   last;
+    ngx_int_t                  rc;
     ngx_quic_connection_t     *qc;
     ngx_quic_crypto_frame_t   *f;
     ngx_quic_frames_stream_t  *fs;
@@ -2860,8 +2861,19 @@ ngx_quic_handle_crypto_frame(ngx_connect
         return NGX_ERROR;
     }
 
-    return ngx_quic_handle_ordered_frame(c, fs, frame, ngx_quic_crypto_input,
-                                         NULL);
+    rc = ngx_quic_handle_ordered_frame(c, fs, frame, ngx_quic_crypto_input,
+                                       NULL);
+    if (rc != NGX_DECLINED) {
+        return rc;
+    }
+
+    /* speeding up handshake completion */
+
+    if (pkt->level == ssl_encryption_initial) {
+        ngx_quic_resend_frames(c, ngx_quic_get_send_ctx(qc, pkt->level));
+    }
+
+    return NGX_OK;
 }